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105 lines
3.8 KiB
105 lines
3.8 KiB
/*
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* This file is part of the MicroPython project, http://micropython.org/
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*
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* The MIT License (MIT)
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*
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* Copyright (c) 2016-2018 Damien P. George
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include "drivers/bus/spi.h"
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int mp_soft_spi_ioctl(void *self_in, uint32_t cmd) {
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mp_soft_spi_obj_t *self = (mp_soft_spi_obj_t*)self_in;
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switch (cmd) {
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case MP_SPI_IOCTL_INIT:
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mp_hal_pin_write(self->sck, self->polarity);
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mp_hal_pin_output(self->sck);
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mp_hal_pin_output(self->mosi);
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mp_hal_pin_input(self->miso);
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break;
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case MP_SPI_IOCTL_DEINIT:
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break;
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}
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return 0;
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}
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void mp_soft_spi_transfer(void *self_in, size_t len, const uint8_t *src, uint8_t *dest) {
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mp_soft_spi_obj_t *self = (mp_soft_spi_obj_t*)self_in;
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uint32_t delay_half = self->delay_half;
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// only MSB transfer is implemented
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// If a port defines MICROPY_HW_SOFTSPI_MIN_DELAY, and the configured
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// delay_half is equal to this value, then the software SPI implementation
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// will run as fast as possible, limited only by CPU speed and GPIO time.
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#ifdef MICROPY_HW_SOFTSPI_MIN_DELAY
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if (delay_half == MICROPY_HW_SOFTSPI_MIN_DELAY) {
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for (size_t i = 0; i < len; ++i) {
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uint8_t data_out = src[i];
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uint8_t data_in = 0;
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for (int j = 0; j < 8; ++j, data_out <<= 1) {
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mp_hal_pin_write(self->mosi, (data_out >> 7) & 1);
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mp_hal_pin_write(self->sck, 1 - self->polarity);
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data_in = (data_in << 1) | mp_hal_pin_read(self->miso);
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mp_hal_pin_write(self->sck, self->polarity);
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}
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if (dest != NULL) {
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dest[i] = data_in;
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}
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}
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return;
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}
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#endif
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for (size_t i = 0; i < len; ++i) {
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uint8_t data_out = src[i];
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uint8_t data_in = 0;
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for (int j = 0; j < 8; ++j, data_out <<= 1) {
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mp_hal_pin_write(self->mosi, (data_out >> 7) & 1);
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if (self->phase == 0) {
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mp_hal_delay_us_fast(delay_half);
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mp_hal_pin_write(self->sck, 1 - self->polarity);
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} else {
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mp_hal_pin_write(self->sck, 1 - self->polarity);
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mp_hal_delay_us_fast(delay_half);
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}
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data_in = (data_in << 1) | mp_hal_pin_read(self->miso);
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if (self->phase == 0) {
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mp_hal_delay_us_fast(delay_half);
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mp_hal_pin_write(self->sck, self->polarity);
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} else {
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mp_hal_pin_write(self->sck, self->polarity);
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mp_hal_delay_us_fast(delay_half);
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}
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}
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if (dest != NULL) {
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dest[i] = data_in;
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}
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}
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}
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const mp_spi_proto_t mp_soft_spi_proto = {
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.ioctl = mp_soft_spi_ioctl,
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.transfer = mp_soft_spi_transfer,
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};
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