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100 lines
3.6 KiB
100 lines
3.6 KiB
#include <stdint.h>
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#include "stm32f4xx.h"
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#include "utils.h"
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#ifdef CRC8_TABLE
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/* CRC-8 x8+x2+x+1 */
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unsigned char crc8(const unsigned char *p, int n)
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{
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unsigned char crc8 = 0;
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static unsigned char crc_array[256] = {
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0x00, 0x07, 0x0E, 0x09, 0x1C, 0x1B, 0x12, 0x15, 0x38, 0x3F, 0x36, 0x31, 0x24, 0x23, 0x2A, 0x2D,
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0x70, 0x77, 0x7E, 0x79, 0x6C, 0x6B, 0x62, 0x65, 0x48, 0x4F, 0x46, 0x41, 0x54, 0x53, 0x5A, 0x5D,
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0xE0, 0xE7, 0xEE, 0xE9, 0xFC, 0xFB, 0xF2, 0xF5, 0xD8, 0xDF, 0xD6, 0xD1, 0xC4, 0xC3, 0xCA, 0xCD,
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0x90, 0x97, 0x9E, 0x99, 0x8C, 0x8B, 0x82, 0x85, 0xA8, 0xAF, 0xA6, 0xA1, 0xB4, 0xB3, 0xBA, 0xBD,
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0xC7, 0xC0, 0xC9, 0xCE, 0xDB, 0xDC, 0xD5, 0xD2, 0xFF, 0xF8, 0xF1, 0xF6, 0xE3, 0xE4, 0xED, 0xEA,
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0xB7, 0xB0, 0xB9, 0xBE, 0xAB, 0xAC, 0xA5, 0xA2, 0x8F, 0x88, 0x81, 0x86, 0x93, 0x94, 0x9D, 0x9A,
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0x27, 0x20, 0x29, 0x2E, 0x3B, 0x3C, 0x35, 0x32, 0x1F, 0x18, 0x11, 0x16, 0x03, 0x04, 0x0D, 0x0A,
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0x57, 0x50, 0x59, 0x5E, 0x4B, 0x4C, 0x45, 0x42, 0x6F, 0x68, 0x61, 0x66, 0x73, 0x74, 0x7D, 0x7A,
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0x89, 0x8E, 0x87, 0x80, 0x95, 0x92, 0x9B, 0x9C, 0xB1, 0xB6, 0xBF, 0xB8, 0xAD, 0xAA, 0xA3, 0xA4,
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0xF9, 0xFE, 0xF7, 0xF0, 0xE5, 0xE2, 0xEB, 0xEC, 0xC1, 0xC6, 0xCF, 0xC8, 0xDD, 0xDA, 0xD3, 0xD4,
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0x69, 0x6E, 0x67, 0x60, 0x75, 0x72, 0x7B, 0x7C, 0x51, 0x56, 0x5F, 0x58, 0x4D, 0x4A, 0x43, 0x44,
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0x19, 0x1E, 0x17, 0x10, 0x05, 0x02, 0x0B, 0x0C, 0x21, 0x26, 0x2F, 0x28, 0x3D, 0x3A, 0x33, 0x34,
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0x4E, 0x49, 0x40, 0x47, 0x52, 0x55, 0x5C, 0x5B, 0x76, 0x71, 0x78, 0x7F, 0x6A, 0x6D, 0x64, 0x63,
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0x3E, 0x39, 0x30, 0x37, 0x22, 0x25, 0x2C, 0x2B, 0x06, 0x01, 0x08, 0x0F, 0x1A, 0x1D, 0x14, 0x13,
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0xAE, 0xA9, 0xA0, 0xA7, 0xB2, 0xB5, 0xBC, 0xBB, 0x96, 0x91, 0x98, 0x9F, 0x8A, 0x8D, 0x84, 0x83,
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0xDE, 0xD9, 0xD0, 0xD7, 0xC2, 0xC5, 0xCC, 0xCB, 0xE6, 0xE1, 0xE8, 0xEF, 0xFA, 0xFD, 0xF4, 0xF3
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};
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while (n > 0) {
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crc8 = crc_array[crc8^*p]; /* lookup table */
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p++;
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--n;
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}
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return crc8;
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}
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#else
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/* CRC-8 x8+x2+x+1 */
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unsigned char crc8(const unsigned char *data, int len)
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{
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unsigned crc = 0;
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int i, j;
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for (j = len; j; j--, data++) {
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crc ^= (*data << 8);
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for (i = 8; i; i--) {
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if (crc & 0x8000)
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crc ^= (0x1070 << 3);
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crc <<= 1;
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}
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}
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return (unsigned char)(crc >> 8);
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}
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#endif
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void __attribute__((weak)) target_close()
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{
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}
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int go(unsigned long vect)
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{
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volatile unsigned int *ptr = (volatile unsigned int *)vect;
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register unsigned int stack = ptr[0];
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register unsigned int addr = ptr[1];
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// printf("stack: %x, entry: %x, [%x, %x]\r\n", stack, addr, (stack & 0x2ffC0000), (stack & 0x1ffe0000));
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// printf("off: %x\n", (vect - NVIC_VectTab_FLASH));
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if (((stack & 0x2ffc0000) == 0x20000000) /* SRAM */ || ((stack & 0x1ffe0000) == 0x10000000) /* CCMRAM */) {
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/* disable global irq */
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__disable_irq();
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target_close();
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NVIC_SetVectorTable(NVIC_VectTab_FLASH, (vect - NVIC_VectTab_FLASH));
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/* set the stack pointer, then run */
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__asm__ __volatile__(
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"msr msp, %[tos]\n\t"
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"msr psp, %[tos]\n\t"
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"isb sy\n\t"
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"dsb sy\n\t"
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"blx %[app]\n\t" : : [tos] "r" (stack), [app] "r" (addr));
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}
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return -1;
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}
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void delay_microseconds(unsigned int us)
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{
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#define SYSCLK (SystemCoreClock / 1000000)
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unsigned int n = (us * (SYSCLK) - 8) / 3 - 10;
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if (us <= 3) {
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n >>= 2;
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}
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__asm__ __volatile__ (
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"L1: subs %[steps], #1\n\t"
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" bcs L1\n\t": : [steps] "r" (n));
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#undef SYSCLK
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}
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