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wasmstm32webassemblymicrocontrollerarmavrspiwasiadafruitarduinocircuitplayground-expressgpioi2cllvmmicrobitnrf51nrf52nrf52840samd21tinygo
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572 lines
24 KiB
572 lines
24 KiB
#!/usr/bin/env python3
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import sys
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import os
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from xml.etree import ElementTree
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from glob import glob
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from collections import OrderedDict
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import re
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import argparse
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class Device:
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# dummy
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pass
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def getText(element):
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if element is None:
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return "None"
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return ''.join(element.itertext())
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def formatText(text):
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text = re.sub('[ \t\n]+', ' ', text) # Collapse whitespace (like in HTML)
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text = text.replace('\\n ', '\n')
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text = text.strip()
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return text
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def readSVD(path, sourceURL):
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# Read ARM SVD files.
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device = Device()
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xml = ElementTree.parse(path)
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root = xml.getroot()
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deviceName = getText(root.find('name'))
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deviceDescription = getText(root.find('description')).strip()
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licenseTexts = root.findall('licenseText')
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if len(licenseTexts) == 0:
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licenseText = None
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elif len(licenseTexts) == 1:
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licenseText = formatText(getText(licenseTexts[0]))
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else:
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raise ValueError('multiple <licenseText> elements')
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device.peripherals = []
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peripheralDict = {}
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groups = {}
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interrupts = OrderedDict()
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for periphEl in root.findall('./peripherals/peripheral'):
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name = getText(periphEl.find('name'))
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descriptionTags = periphEl.findall('description')
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description = ''
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if descriptionTags:
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description = formatText(getText(descriptionTags[0]))
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baseAddress = int(getText(periphEl.find('baseAddress')), 0)
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groupNameTags = periphEl.findall('groupName')
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groupName = None
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if groupNameTags:
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groupName = getText(groupNameTags[0])
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interruptEls = periphEl.findall('interrupt')
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for interrupt in interruptEls:
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intrName = getText(interrupt.find('name'))
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intrIndex = int(getText(interrupt.find('value')))
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addInterrupt(interrupts, intrName, intrIndex, description)
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# As a convenience, also use the peripheral name as the interrupt
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# name. Only do that for the nrf for now, as the stm32 .svd files
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# don't always put interrupts in the correct peripheral...
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if len(interruptEls) == 1 and deviceName.startswith('nrf'):
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addInterrupt(interrupts, name, intrIndex, description)
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if periphEl.get('derivedFrom') or groupName in groups:
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if periphEl.get('derivedFrom'):
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derivedFromName = periphEl.get('derivedFrom')
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derivedFrom = peripheralDict[derivedFromName]
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else:
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derivedFrom = groups[groupName]
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peripheral = {
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'name': name,
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'groupName': derivedFrom['groupName'],
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'description': description or derivedFrom['description'],
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'baseAddress': baseAddress,
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}
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device.peripherals.append(peripheral)
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peripheralDict[name] = peripheral
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if 'subtypes' in derivedFrom:
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for subtype in derivedFrom['subtypes']:
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subp = {
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'name': name + "_"+subtype['clusterName'],
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'groupName': subtype['groupName'],
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'description': subtype['description'],
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'baseAddress': baseAddress,
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}
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device.peripherals.append(subp)
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continue
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peripheral = {
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'name': name,
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'groupName': groupName or name,
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'description': description,
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'baseAddress': baseAddress,
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'registers': [],
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'subtypes': [],
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}
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device.peripherals.append(peripheral)
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peripheralDict[name] = peripheral
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if groupName and groupName not in groups:
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groups[groupName] = peripheral
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regsEls = periphEl.findall('registers')
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if regsEls:
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if len(regsEls) != 1:
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raise ValueError('expected just one <registers> in a <peripheral>')
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for register in regsEls[0].findall('register'):
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peripheral['registers'].extend(parseRegister(groupName or name, register, baseAddress))
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for cluster in regsEls[0].findall('cluster'):
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clusterName = getText(cluster.find('name')).replace('[%s]', '')
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clusterDescription = getText(cluster.find('description'))
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clusterPrefix = clusterName + '_'
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clusterOffset = int(getText(cluster.find('addressOffset')), 0)
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if cluster.find('dim') is None:
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if clusterOffset is 0:
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# make this a separate peripheral
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cpRegisters = []
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for regEl in cluster.findall('register'):
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cpRegisters.extend(parseRegister(groupName, regEl, baseAddress, clusterName+"_"))
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cpRegisters.sort(key=lambda r: r['address'])
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clusterPeripheral = {
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'name': name+ "_" +clusterName,
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'groupName': groupName+ "_" +clusterName,
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'description': description+ " - " +clusterName,
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'clusterName': clusterName,
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'baseAddress': baseAddress,
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'registers': cpRegisters,
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}
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device.peripherals.append(clusterPeripheral)
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peripheral['subtypes'].append(clusterPeripheral)
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continue
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dim = None
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dimIncrement = None
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else:
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dim = int(getText(cluster.find('dim')))
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dimIncrement = int(getText(cluster.find('dimIncrement')), 0)
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clusterRegisters = []
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for regEl in cluster.findall('register'):
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clusterRegisters.extend(parseRegister(groupName or name, regEl, baseAddress + clusterOffset, clusterPrefix))
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clusterRegisters.sort(key=lambda r: r['address'])
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if dimIncrement is None:
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lastReg = clusterRegisters[-1]
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lastAddress = lastReg['address']
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if lastReg['array'] is not None:
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lastAddress = lastReg['address'] + lastReg['array'] * lastReg['elementsize']
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firstAddress = clusterRegisters[0]['address']
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dimIncrement = lastAddress - firstAddress
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peripheral['registers'].append({
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'name': clusterName,
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'address': baseAddress + clusterOffset,
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'description': clusterDescription,
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'registers': clusterRegisters,
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'array': dim,
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'elementsize': dimIncrement,
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})
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peripheral['registers'].sort(key=lambda r: r['address'])
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device.interrupts = sorted(interrupts.values(), key=lambda v: v['index'])
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licenseBlock = ''
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if licenseText is not None:
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licenseBlock = '// ' + licenseText.replace('\n', '\n// ')
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licenseBlock = '\n'.join(map(str.rstrip, licenseBlock.split('\n'))) # strip trailing whitespace
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device.metadata = {
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'file': os.path.basename(path),
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'descriptorSource': sourceURL,
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'name': deviceName,
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'nameLower': deviceName.lower(),
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'description': deviceDescription,
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'licenseBlock': licenseBlock,
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}
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return device
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def addInterrupt(interrupts, intrName, intrIndex, description):
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if intrName in interrupts:
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if interrupts[intrName]['index'] != intrIndex:
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raise ValueError('interrupt with the same name has different indexes: %s (%d vs %d)'
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% (intrName, interrupts[intrName]['index'], intrIndex))
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if description not in interrupts[intrName]['description'].split(' // '):
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interrupts[intrName]['description'] += ' // ' + description
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else:
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interrupts[intrName] = {
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'name': intrName,
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'index': intrIndex,
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'description': description,
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}
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def parseBitfields(groupName, regName, fieldsEls, bitfieldPrefix=''):
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fields = []
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if fieldsEls:
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for fieldEl in fieldsEls[0].findall('field'):
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fieldName = getText(fieldEl.find('name'))
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descrEls = fieldEl.findall('description')
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lsbTags = fieldEl.findall('lsb')
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if len(lsbTags) == 1:
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lsb = int(getText(lsbTags[0]))
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else:
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lsb = int(getText(fieldEl.find('bitOffset')))
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msbTags = fieldEl.findall('msb')
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if len(msbTags) == 1:
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msb = int(getText(msbTags[0]))
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else:
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msb = int(getText(fieldEl.find('bitWidth'))) + lsb - 1
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fields.append({
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'name': '{}_{}{}_{}_Pos'.format(groupName, bitfieldPrefix, regName, fieldName),
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'description': 'Position of %s field.' % fieldName,
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'value': lsb,
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})
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fields.append({
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'name': '{}_{}{}_{}_Msk'.format(groupName, bitfieldPrefix, regName, fieldName),
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'description': 'Bit mask of %s field.' % fieldName,
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'value': (0xffffffff >> (31 - (msb - lsb))) << lsb,
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})
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if lsb == msb: # single bit
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fields.append({
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'name': '{}_{}{}_{}'.format(groupName, bitfieldPrefix, regName, fieldName),
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'description': 'Bit %s.' % fieldName,
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'value': 1 << lsb,
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})
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for enumEl in fieldEl.findall('enumeratedValues/enumeratedValue'):
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enumName = getText(enumEl.find('name'))
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enumDescription = getText(enumEl.find('description'))
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enumValue = int(getText(enumEl.find('value')), 0)
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fields.append({
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'name': '{}_{}{}_{}_{}'.format(groupName, bitfieldPrefix, regName, fieldName, enumName),
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'description': enumDescription,
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'value': enumValue,
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})
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return fields
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def parseRegister(groupName, regEl, baseAddress, bitfieldPrefix=''):
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regName = getText(regEl.find('name'))
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regDescription = getText(regEl.find('description'))
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offsetEls = regEl.findall('offset')
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if not offsetEls:
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offsetEls = regEl.findall('addressOffset')
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address = baseAddress + int(getText(offsetEls[0]), 0)
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size = 4
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elSizes = regEl.findall('size')
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if elSizes:
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size = int(getText(elSizes[0]), 0) // 8
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dimEls = regEl.findall('dim')
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fieldsEls = regEl.findall('fields')
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array = None
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if dimEls:
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array = int(getText(dimEls[0]), 0)
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dimIncrement = int(getText(regEl.find('dimIncrement')), 0)
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if "[%s]" in regName:
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# just a normal array of registers
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regName = regName.replace('[%s]', '')
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elif "%s" in regName:
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# a "spaced array" of registers, special processing required
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# we need to generate a separate register for each "element"
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results = []
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for i in range(array):
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regAddress = address + (i * dimIncrement)
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results.append({
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'name': regName.replace('%s', str(i)),
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'address': regAddress,
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'description': regDescription.replace('\n', ' '),
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'bitfields': [],
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'array': None,
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'elementsize': size,
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})
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# set first result bitfield
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shortName = regName.replace('_%s', '').replace('%s', '')
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results[0]['bitfields'] = parseBitfields(groupName, shortName, fieldsEls, bitfieldPrefix)
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return results
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return [{
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'name': regName,
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'address': address,
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'description': regDescription.replace('\n', ' '),
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'bitfields': parseBitfields(groupName, regName, fieldsEls, bitfieldPrefix),
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'array': array,
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'elementsize': size,
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}]
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def writeGo(outdir, device):
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# The Go module for this device.
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out = open(outdir + '/' + device.metadata['nameLower'] + '.go', 'w')
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pkgName = os.path.basename(outdir.rstrip('/'))
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out.write('''\
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// Automatically generated file. DO NOT EDIT.
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// Generated by gen-device-svd.py from {file}, see {descriptorSource}
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// +build {pkgName},{nameLower}
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// {description}
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//
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{licenseBlock}
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package {pkgName}
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import "unsafe"
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// Special types that cause loads/stores to be volatile (necessary for
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// memory-mapped registers).
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//go:volatile
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type RegValue uint32
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//go:volatile
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type RegValue16 uint16
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//go:volatile
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type RegValue8 uint8
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// Some information about this device.
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const (
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DEVICE = "{name}"
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)
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'''.format(pkgName=pkgName, **device.metadata))
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out.write('\n// Interrupt numbers\nconst (\n')
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for intr in device.interrupts:
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out.write('\tIRQ_{name} = {index} // {description}\n'.format(**intr))
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intrMax = max(map(lambda intr: intr['index'], device.interrupts))
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out.write('\tIRQ_max = {} // Highest interrupt number on this device.\n'.format(intrMax))
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out.write(')\n')
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# Define actual peripheral pointers.
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out.write('\n// Peripherals.\nvar (\n')
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for peripheral in device.peripherals:
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out.write('\t{name} = (*{groupName}_Type)(unsafe.Pointer(uintptr(0x{baseAddress:x}))) // {description}\n'.format(**peripheral))
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out.write(')\n')
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# Define peripheral struct types.
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for peripheral in device.peripherals:
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if 'registers' not in peripheral:
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# This peripheral was derived from another peripheral. No new type
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# needs to be defined for it.
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continue
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out.write('\n// {description}\ntype {groupName}_Type struct {{\n'.format(**peripheral))
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address = peripheral['baseAddress']
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padNumber = 0
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for register in peripheral['registers']:
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if address > register['address'] and 'registers' not in register :
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# In Nordic SVD files, these registers are deprecated or
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# duplicates, so can be ignored.
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#print('skip: %s.%s %s - %s %s' % (peripheral['name'], register['name'], address, register['address'], register['elementsize']))
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continue
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eSize = register['elementsize']
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if eSize == 4:
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regType = 'RegValue'
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elif eSize == 2:
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regType = 'RegValue16'
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elif eSize == 1:
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regType = 'RegValue8'
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else:
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eSize = 4
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regType = 'RegValue'
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# insert padding, if needed
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if address < register['address']:
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bytesNeeded = register['address'] - address
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if bytesNeeded == 1:
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out.write('\t_padding{padNumber} {regType}\n'.format(padNumber=padNumber, regType='RegValue8'))
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elif bytesNeeded == 2:
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out.write('\t_padding{padNumber} {regType}\n'.format(padNumber=padNumber, regType='RegValue16'))
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else:
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numSkip = (register['address'] - address) // eSize
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if numSkip == 1:
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out.write('\t_padding{padNumber} {regType}\n'.format(padNumber=padNumber, regType=regType))
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else:
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out.write('\t_padding{padNumber} [{num}]{regType}\n'.format(padNumber=padNumber, num=numSkip, regType=regType))
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padNumber += 1
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address = register['address']
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lastCluster = False
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if 'registers' in register:
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# This is a cluster, not a register. Create the cluster type.
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regType = 'struct {\n'
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subaddress = register['address']
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for subregister in register['registers']:
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if subregister['elementsize'] == 4:
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subregType = 'RegValue'
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elif subregister['elementsize'] == 2:
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subregType = 'RegValue16'
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else:
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subregType = 'RegValue8'
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if subregister['array']:
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subregType = '[{}]{}'.format(subregister['array'], subregType)
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if subaddress != subregister['address']:
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bytesNeeded = subregister['address'] - subaddress
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if bytesNeeded == 1:
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regType += '\t\t_padding{padNumber} {subregType}\n'.format(padNumber=padNumber, subregType='RegValue8')
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elif bytesNeeded == 2:
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regType += '\t\t_padding{padNumber} {subregType}\n'.format(padNumber=padNumber, subregType='RegValue16')
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else:
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numSkip = (subregister['address'] - subaddress)
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if numSkip < 1:
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continue
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elif numSkip == 1:
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regType += '\t\t_padding{padNumber} {subregType}\n'.format(padNumber=padNumber, subregType='RegValue8')
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else:
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regType += '\t\t_padding{padNumber} [{num}]{subregType}\n'.format(padNumber=padNumber, num=numSkip, subregType='RegValue8')
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padNumber += 1
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subaddress += bytesNeeded
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if subregister['array'] is not None:
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subaddress += subregister['elementsize'] * subregister['array']
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else:
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subaddress += subregister['elementsize']
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regType += '\t\t{name} {subregType}\n'.format(name=subregister['name'], subregType=subregType)
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if register['array'] is not None:
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if subaddress != register['address'] + register['elementsize']:
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numSkip = ((register['address'] + register['elementsize']) - subaddress) // 4
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if numSkip <= 1:
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regType += '\t\t_padding{padNumber} {subregType}\n'.format(padNumber=padNumber, subregType=subregType)
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else:
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regType += '\t\t_padding{padNumber} [{num}]{subregType}\n'.format(padNumber=padNumber, num=numSkip, subregType=subregType)
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else:
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lastCluster = True
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regType += '\t}'
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address = subaddress
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if register['array'] is not None:
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regType = '[{}]{}'.format(register['array'], regType)
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out.write('\t{name} {regType}\n'.format(name=register['name'], regType=regType))
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# next address
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if lastCluster is True:
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lastCluster = False
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elif register['array'] is not None:
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address = register['address'] + register['elementsize'] * register['array']
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else:
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address = register['address'] + register['elementsize']
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out.write('}\n')
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# Define bitfields.
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for peripheral in device.peripherals:
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if 'registers' not in peripheral:
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# This peripheral was derived from another peripheral. Bitfields are
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# already defined.
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continue
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out.write('\n// Bitfields for {name}: {description}\nconst('.format(**peripheral))
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for register in peripheral['registers']:
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if register.get('bitfields'):
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writeGoRegisterBitfields(out, register, register['name'])
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for subregister in register.get('registers', []):
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writeGoRegisterBitfields(out, subregister, register['name'] + '.' + subregister['name'])
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out.write(')\n')
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def writeGoRegisterBitfields(out, register, name):
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out.write('\n\t// {}'.format(name))
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if register['description']:
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out.write(': {description}'.format(**register))
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out.write('\n')
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for bitfield in register['bitfields']:
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out.write('\t{name} = 0x{value:x}'.format(**bitfield))
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if bitfield['description']:
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out.write(' // {description}'.format(**bitfield))
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out.write('\n')
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def writeAsm(outdir, device):
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# The interrupt vector, which is hard to write directly in Go.
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out = open(outdir + '/' + device.metadata['nameLower'] + '.s', 'w')
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out.write('''\
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// Automatically generated file. DO NOT EDIT.
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// Generated by gen-device-svd.py from {file}, see {descriptorSource}
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// {description}
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//
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{licenseBlock}
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.syntax unified
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// This is the default handler for interrupts, if triggered but not defined.
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.section .text.Default_Handler
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.global Default_Handler
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.type Default_Handler, %function
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Default_Handler:
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wfe
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b Default_Handler
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// Avoid the need for repeated .weak and .set instructions.
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.macro IRQ handler
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.weak \\handler
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.set \\handler, Default_Handler
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.endm
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// Must set the "a" flag on the section:
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// https://svnweb.freebsd.org/base/stable/11/sys/arm/arm/locore-v4.S?r1=321049&r2=321048&pathrev=321049
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// https://sourceware.org/binutils/docs/as/Section.html#ELF-Version
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.section .isr_vector, "a", %progbits
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.global __isr_vector
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// Interrupt vector as defined by Cortex-M, starting with the stack top.
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// On reset, SP is initialized with *0x0 and PC is loaded with *0x4, loading
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// _stack_top and Reset_Handler.
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.long _stack_top
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.long Reset_Handler
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.long NMI_Handler
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.long HardFault_Handler
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.long MemoryManagement_Handler
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.long BusFault_Handler
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.long UsageFault_Handler
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.long 0
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.long 0
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.long 0
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.long 0
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.long SVC_Handler
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.long DebugMon_Handler
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.long 0
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.long PendSV_Handler
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.long SysTick_Handler
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// Extra interrupts for peripherals defined by the hardware vendor.
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'''.format(**device.metadata))
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num = 0
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for intr in device.interrupts:
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if intr['index'] == num - 1:
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continue
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if intr['index'] < num:
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raise ValueError('interrupt numbers are not sorted')
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while intr['index'] > num:
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out.write(' .long 0\n')
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num += 1
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num += 1
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out.write(' .long {name}_IRQHandler\n'.format(**intr))
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out.write('''
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// Define default implementations for interrupts, redirecting to
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// Default_Handler when not implemented.
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IRQ NMI_Handler
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IRQ HardFault_Handler
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IRQ MemoryManagement_Handler
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IRQ BusFault_Handler
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IRQ UsageFault_Handler
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IRQ SVC_Handler
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IRQ DebugMon_Handler
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IRQ PendSV_Handler
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IRQ SysTick_Handler
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''')
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for intr in device.interrupts:
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out.write(' IRQ {name}_IRQHandler\n'.format(**intr))
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def generate(indir, outdir, sourceURL):
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if not os.path.isdir(indir):
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print('cannot find input directory:', indir, file=sys.stderr)
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sys.exit(1)
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if not os.path.isdir(outdir):
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os.mkdir(outdir)
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infiles = glob(indir + '/*.svd')
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if not infiles:
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print('no .svd files found:', indir, file=sys.stderr)
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sys.exit(1)
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for filepath in sorted(infiles):
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print(filepath)
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device = readSVD(filepath, sourceURL)
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writeGo(outdir, device)
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writeAsm(outdir, device)
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if __name__ == '__main__':
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parser = argparse.ArgumentParser(description='Generate Go register descriptors and interrupt vectors from .svd files')
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parser.add_argument('indir', metavar='indir', type=str,
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help='input directory containing .svd files')
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parser.add_argument('outdir', metavar='outdir', type=str,
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help='output directory')
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parser.add_argument('--source', metavar='source', type=str,
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help='output directory',
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default='<unknown>')
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args = parser.parse_args()
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generate(args.indir, args.outdir, args.source)
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