drivers/bus: Pull out software SPI implementation to dedicated driver.
This patch takes the software SPI implementation from extmod/machine_spi.c and moves it to a dedicated file in drivers/bus/softspi.c. This allows the SPI driver to be used independently of the uPy runtime, making it a more general component.
This commit is contained in:
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ad2a6e538c
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58ebeca6a9
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@ -0,0 +1,105 @@
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/*
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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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@ -0,0 +1,55 @@
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/*
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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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#ifndef MICROPY_INCLUDED_DRIVERS_BUS_SPI_H
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#define MICROPY_INCLUDED_DRIVERS_BUS_SPI_H
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#include "py/mphal.h"
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enum {
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MP_SPI_IOCTL_INIT,
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MP_SPI_IOCTL_DEINIT,
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};
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typedef struct _mp_spi_proto_t {
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int (*ioctl)(void *self, uint32_t cmd);
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void (*transfer)(void *self, size_t len, const uint8_t *src, uint8_t *dest);
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} mp_spi_proto_t;
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typedef struct _mp_soft_spi_obj_t {
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uint32_t delay_half; // microsecond delay for half SCK period
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uint8_t polarity;
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uint8_t phase;
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mp_hal_pin_obj_t sck;
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mp_hal_pin_obj_t mosi;
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mp_hal_pin_obj_t miso;
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} mp_soft_spi_obj_t;
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extern const mp_spi_proto_t mp_soft_spi_proto;
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int mp_soft_spi_ioctl(void *self, uint32_t cmd);
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void mp_soft_spi_transfer(void *self, size_t len, const uint8_t *src, uint8_t *dest);
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#endif // MICROPY_INCLUDED_DRIVERS_BUS_SPI_H
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@ -38,61 +38,6 @@
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#define MICROPY_PY_MACHINE_SPI_LSB (1)
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#endif
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void mp_machine_soft_spi_transfer(mp_obj_base_t *self_in, size_t len, const uint8_t *src, uint8_t *dest) {
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mp_machine_soft_spi_obj_t *self = (mp_machine_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_PY_MACHINE_SPI_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_PY_MACHINE_SPI_MIN_DELAY
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if (delay_half == MICROPY_PY_MACHINE_SPI_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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/******************************************************************************/
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// MicroPython bindings for generic machine.SPI
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// Implementation of soft SPI
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STATIC uint32_t baudrate_from_delay_half(uint32_t delay_half) {
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#ifdef MICROPY_PY_MACHINE_SPI_MIN_DELAY
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if (delay_half == MICROPY_PY_MACHINE_SPI_MIN_DELAY) {
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return MICROPY_PY_MACHINE_SPI_MAX_BAUDRATE;
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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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return MICROPY_HW_SOFTSPI_MAX_BAUDRATE;
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} else
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#endif
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{
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}
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STATIC uint32_t baudrate_to_delay_half(uint32_t baudrate) {
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#ifdef MICROPY_PY_MACHINE_SPI_MIN_DELAY
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if (baudrate >= MICROPY_PY_MACHINE_SPI_MAX_BAUDRATE) {
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return MICROPY_PY_MACHINE_SPI_MIN_DELAY;
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#ifdef MICROPY_HW_SOFTSPI_MIN_DELAY
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if (baudrate >= MICROPY_HW_SOFTSPI_MAX_BAUDRATE) {
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return MICROPY_HW_SOFTSPI_MIN_DELAY;
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} else
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#endif
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{
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@ -229,8 +174,8 @@ STATIC void mp_machine_soft_spi_print(const mp_print_t *print, mp_obj_t self_in,
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mp_machine_soft_spi_obj_t *self = MP_OBJ_TO_PTR(self_in);
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mp_printf(print, "SoftSPI(baudrate=%u, polarity=%u, phase=%u,"
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" sck=" MP_HAL_PIN_FMT ", mosi=" MP_HAL_PIN_FMT ", miso=" MP_HAL_PIN_FMT ")",
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baudrate_from_delay_half(self->delay_half), self->polarity, self->phase,
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mp_hal_pin_name(self->sck), mp_hal_pin_name(self->mosi), mp_hal_pin_name(self->miso));
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baudrate_from_delay_half(self->spi.delay_half), self->spi.polarity, self->spi.phase,
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mp_hal_pin_name(self->spi.sck), mp_hal_pin_name(self->spi.mosi), mp_hal_pin_name(self->spi.miso));
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}
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STATIC mp_obj_t mp_machine_soft_spi_make_new(const mp_obj_type_t *type, size_t n_args, size_t n_kw, const mp_obj_t *all_args) {
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@ -253,9 +198,9 @@ STATIC mp_obj_t mp_machine_soft_spi_make_new(const mp_obj_type_t *type, size_t n
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self->base.type = &mp_machine_soft_spi_type;
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// set parameters
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self->delay_half = baudrate_to_delay_half(args[ARG_baudrate].u_int);
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self->polarity = args[ARG_polarity].u_int;
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self->phase = args[ARG_phase].u_int;
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self->spi.delay_half = baudrate_to_delay_half(args[ARG_baudrate].u_int);
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self->spi.polarity = args[ARG_polarity].u_int;
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self->spi.phase = args[ARG_phase].u_int;
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if (args[ARG_bits].u_int != 8) {
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mp_raise_ValueError("bits must be 8");
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}
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|| args[ARG_miso].u_obj == MP_OBJ_NULL) {
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mp_raise_ValueError("must specify all of sck/mosi/miso");
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}
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self->sck = mp_hal_get_pin_obj(args[ARG_sck].u_obj);
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self->mosi = mp_hal_get_pin_obj(args[ARG_mosi].u_obj);
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self->miso = mp_hal_get_pin_obj(args[ARG_miso].u_obj);
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self->spi.sck = mp_hal_get_pin_obj(args[ARG_sck].u_obj);
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self->spi.mosi = mp_hal_get_pin_obj(args[ARG_mosi].u_obj);
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self->spi.miso = mp_hal_get_pin_obj(args[ARG_miso].u_obj);
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// configure pins
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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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// configure bus
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mp_soft_spi_ioctl(&self->spi, MP_SPI_IOCTL_INIT);
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return MP_OBJ_FROM_PTR(self);
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}
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mp_arg_parse_all(n_args, pos_args, kw_args, MP_ARRAY_SIZE(allowed_args), allowed_args, args);
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if (args[ARG_baudrate].u_int != -1) {
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self->delay_half = baudrate_to_delay_half(args[ARG_baudrate].u_int);
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self->spi.delay_half = baudrate_to_delay_half(args[ARG_baudrate].u_int);
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}
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if (args[ARG_polarity].u_int != -1) {
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self->polarity = args[ARG_polarity].u_int;
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self->spi.polarity = args[ARG_polarity].u_int;
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}
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if (args[ARG_phase].u_int != -1) {
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self->phase = args[ARG_phase].u_int;
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self->spi.phase = args[ARG_phase].u_int;
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}
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if (args[ARG_sck].u_obj != MP_OBJ_NULL) {
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self->sck = mp_hal_get_pin_obj(args[ARG_sck].u_obj);
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self->spi.sck = mp_hal_get_pin_obj(args[ARG_sck].u_obj);
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}
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if (args[ARG_mosi].u_obj != MP_OBJ_NULL) {
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self->mosi = mp_hal_get_pin_obj(args[ARG_mosi].u_obj);
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self->spi.mosi = mp_hal_get_pin_obj(args[ARG_mosi].u_obj);
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}
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if (args[ARG_miso].u_obj != MP_OBJ_NULL) {
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self->miso = mp_hal_get_pin_obj(args[ARG_miso].u_obj);
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self->spi.miso = mp_hal_get_pin_obj(args[ARG_miso].u_obj);
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}
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// configure pins
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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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// configure bus
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mp_soft_spi_ioctl(&self->spi, MP_SPI_IOCTL_INIT);
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}
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STATIC void mp_machine_soft_spi_transfer(mp_obj_base_t *self_in, size_t len, const uint8_t *src, uint8_t *dest) {
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mp_machine_soft_spi_obj_t *self = (mp_machine_soft_spi_obj_t*)self_in;
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mp_soft_spi_transfer(&self->spi, len, src, dest);
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}
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const mp_machine_spi_p_t mp_machine_soft_spi_p = {
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@ -28,6 +28,7 @@
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#include "py/obj.h"
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#include "py/mphal.h"
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#include "drivers/bus/spi.h"
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// SPI protocol
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typedef struct _mp_machine_spi_p_t {
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@ -38,20 +39,13 @@ typedef struct _mp_machine_spi_p_t {
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typedef struct _mp_machine_soft_spi_obj_t {
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mp_obj_base_t base;
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uint32_t delay_half; // microsecond delay for half SCK period
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uint8_t polarity;
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uint8_t phase;
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mp_hal_pin_obj_t sck;
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mp_hal_pin_obj_t mosi;
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mp_hal_pin_obj_t miso;
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mp_soft_spi_obj_t spi;
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} mp_machine_soft_spi_obj_t;
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extern const mp_machine_spi_p_t mp_machine_soft_spi_p;
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extern const mp_obj_type_t mp_machine_soft_spi_type;
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extern const mp_obj_dict_t mp_machine_spi_locals_dict;
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void mp_machine_soft_spi_transfer(mp_obj_base_t *self, size_t len, const uint8_t *src, uint8_t *dest);
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mp_obj_t mp_machine_spi_make_new(const mp_obj_type_t *type, size_t n_args, size_t n_kw, const mp_obj_t *args);
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MP_DECLARE_CONST_FUN_OBJ_VAR_BETWEEN(mp_machine_spi_read_obj);
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@ -195,6 +195,7 @@ LIB_SRC_C += \
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endif
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DRIVERS_SRC_C = $(addprefix drivers/,\
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bus/softspi.c \
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dht/dht.c \
|
||||
)
|
||||
|
||||
|
|
|
@ -135,8 +135,8 @@
|
|||
#define MICROPY_PY_MACHINE_SPI_MSB (0)
|
||||
#define MICROPY_PY_MACHINE_SPI_LSB (1)
|
||||
#define MICROPY_PY_MACHINE_SPI_MAKE_NEW machine_hw_spi_make_new
|
||||
#define MICROPY_PY_MACHINE_SPI_MIN_DELAY (0)
|
||||
#define MICROPY_PY_MACHINE_SPI_MAX_BAUDRATE (ets_get_cpu_frequency() * 1000000 / 200) // roughly
|
||||
#define MICROPY_HW_SOFTSPI_MIN_DELAY (0)
|
||||
#define MICROPY_HW_SOFTSPI_MAX_BAUDRATE (ets_get_cpu_frequency() * 1000000 / 200) // roughly
|
||||
#define MICROPY_PY_USSL (1)
|
||||
#define MICROPY_SSL_MBEDTLS (1)
|
||||
#define MICROPY_PY_USSL_FINALISER (1)
|
||||
|
|
|
@ -130,6 +130,7 @@ LIB_SRC_C += \
|
|||
endif
|
||||
|
||||
DRIVERS_SRC_C = $(addprefix drivers/,\
|
||||
bus/softspi.c \
|
||||
dht/dht.c \
|
||||
)
|
||||
|
||||
|
|
|
@ -135,6 +135,7 @@ SECTIONS
|
|||
*lib/netutils/*.o*(.literal*, .text*)
|
||||
*lib/timeutils/*.o*(.literal*, .text*)
|
||||
*lib/utils/*.o*(.literal*, .text*)
|
||||
*drivers/bus/*.o(.literal* .text*)
|
||||
|
||||
build/main.o(.literal* .text*)
|
||||
*gccollect.o(.literal* .text*)
|
||||
|
|
|
@ -187,6 +187,7 @@ EXTMOD_SRC_C = $(addprefix extmod/,\
|
|||
)
|
||||
|
||||
DRIVERS_SRC_C = $(addprefix drivers/,\
|
||||
bus/softspi.c \
|
||||
bus/softqspi.c \
|
||||
memory/spiflash.c \
|
||||
dht/dht.c \
|
||||
|
|
|
@ -140,8 +140,8 @@
|
|||
#define MICROPY_PY_MACHINE_SPI_MSB (SPI_FIRSTBIT_MSB)
|
||||
#define MICROPY_PY_MACHINE_SPI_LSB (SPI_FIRSTBIT_LSB)
|
||||
#define MICROPY_PY_MACHINE_SPI_MAKE_NEW machine_hard_spi_make_new
|
||||
#define MICROPY_PY_MACHINE_SPI_MIN_DELAY (0)
|
||||
#define MICROPY_PY_MACHINE_SPI_MAX_BAUDRATE (HAL_RCC_GetSysClockFreq() / 48)
|
||||
#define MICROPY_HW_SOFTSPI_MIN_DELAY (0)
|
||||
#define MICROPY_HW_SOFTSPI_MAX_BAUDRATE (HAL_RCC_GetSysClockFreq() / 48)
|
||||
#define MICROPY_PY_FRAMEBUF (1)
|
||||
#ifndef MICROPY_PY_USOCKET
|
||||
#define MICROPY_PY_USOCKET (1)
|
||||
|
|
|
@ -42,12 +42,14 @@ static uint32_t flash_tick_counter_last_write;
|
|||
|
||||
STATIC const mp_machine_soft_spi_obj_t spiflash_spi_bus = {
|
||||
.base = {&mp_machine_soft_spi_type},
|
||||
.delay_half = MICROPY_PY_MACHINE_SPI_MIN_DELAY,
|
||||
.spi = {
|
||||
.delay_half = MICROPY_HW_SOFTSPI_MIN_DELAY,
|
||||
.polarity = 0,
|
||||
.phase = 0,
|
||||
.sck = &MICROPY_HW_SPIFLASH_SCK,
|
||||
.mosi = &MICROPY_HW_SPIFLASH_MOSI,
|
||||
.miso = &MICROPY_HW_SPIFLASH_MISO,
|
||||
}
|
||||
};
|
||||
|
||||
STATIC const mp_spiflash_config_t spiflash_config = {
|
||||
|
|
Loading…
Reference in New Issue