ee1036023e
Being able to send data out in LSB format can be useful, and having support in the low-level driver is much better than requiring Python code to reorder the bits before sending them / after receiving them. In particular if the hardware does not support the LSB format (eg RP2040) then one needs to use the SoftSPI in LSB mode. For this change a default definition of `MICROPY_PY_MACHINE_SPI_MSB/_LSB` was added to `py/mpconfig.h`, making them available to all ports. The identical defines in `esp32/mpconfigport.h` were deleted. Resolves issues #5340, #11404. Signed-off-by: robert-hh <robert@hammelrath.com>
116 lines
4.4 KiB
C
116 lines
4.4 KiB
C
/*
|
|
* This file is part of the MicroPython project, http://micropython.org/
|
|
*
|
|
* The MIT License (MIT)
|
|
*
|
|
* Copyright (c) 2016-2018 Damien P. George
|
|
*
|
|
* Permission is hereby granted, free of charge, to any person obtaining a copy
|
|
* of this software and associated documentation files (the "Software"), to deal
|
|
* in the Software without restriction, including without limitation the rights
|
|
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
|
* copies of the Software, and to permit persons to whom the Software is
|
|
* furnished to do so, subject to the following conditions:
|
|
*
|
|
* The above copyright notice and this permission notice shall be included in
|
|
* all copies or substantial portions of the Software.
|
|
*
|
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
|
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
|
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
|
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
|
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
|
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
|
|
* THE SOFTWARE.
|
|
*/
|
|
|
|
#include "drivers/bus/spi.h"
|
|
|
|
int mp_soft_spi_ioctl(void *self_in, uint32_t cmd) {
|
|
mp_soft_spi_obj_t *self = (mp_soft_spi_obj_t*)self_in;
|
|
|
|
switch (cmd) {
|
|
case MP_SPI_IOCTL_INIT:
|
|
mp_hal_pin_write(self->sck, self->polarity);
|
|
mp_hal_pin_output(self->sck);
|
|
mp_hal_pin_output(self->mosi);
|
|
mp_hal_pin_input(self->miso);
|
|
break;
|
|
|
|
case MP_SPI_IOCTL_DEINIT:
|
|
break;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static uint8_t swap_bits(uint8_t byte) {
|
|
const static uint8_t swap_table[16] = {
|
|
0x00, 0x08, 0x04, 0x0c, 0x02, 0x0a, 0x06, 0x0e,
|
|
0x01, 0x09, 0x05, 0x0d, 0x03, 0x0b, 0x07, 0x0f
|
|
};
|
|
return ((swap_table[byte & 0x0f] << 4) | swap_table[byte >> 4]);
|
|
}
|
|
|
|
void mp_soft_spi_transfer(void *self_in, size_t len, const uint8_t *src, uint8_t *dest) {
|
|
mp_soft_spi_obj_t *self = (mp_soft_spi_obj_t*)self_in;
|
|
uint32_t delay_half = self->delay_half;
|
|
|
|
// If a port defines MICROPY_HW_SOFTSPI_MIN_DELAY, and the configured
|
|
// delay_half is equal to this value, then the software SPI implementation
|
|
// will run as fast as possible, limited only by CPU speed and GPIO time.
|
|
#ifdef MICROPY_HW_SOFTSPI_MIN_DELAY
|
|
if (delay_half == MICROPY_HW_SOFTSPI_MIN_DELAY) {
|
|
for (size_t i = 0; i < len; ++i) {
|
|
uint8_t data_out = self->firstbit != MICROPY_PY_MACHINE_SPI_MSB ?
|
|
src[i] : swap_bits(src[i]);
|
|
uint8_t data_in = 0;
|
|
for (int j = 0; j < 8; ++j, data_out >>= 1) {
|
|
mp_hal_pin_write(self->mosi, data_out & 1);
|
|
mp_hal_pin_write(self->sck, 1 - self->polarity);
|
|
data_in = (data_in << 1) | mp_hal_pin_read(self->miso);
|
|
mp_hal_pin_write(self->sck, self->polarity);
|
|
}
|
|
if (dest != NULL) {
|
|
dest[i] = self->firstbit == MICROPY_PY_MACHINE_SPI_MSB ?
|
|
data_in : swap_bits(data_in);
|
|
}
|
|
}
|
|
return;
|
|
}
|
|
#endif
|
|
|
|
for (size_t i = 0; i < len; ++i) {
|
|
uint8_t data_out = self->firstbit != MICROPY_PY_MACHINE_SPI_MSB ?
|
|
src[i] : swap_bits(src[i]);
|
|
uint8_t data_in = 0;
|
|
for (int j = 0; j < 8; ++j, data_out >>= 1) {
|
|
mp_hal_pin_write(self->mosi, data_out & 1);
|
|
if (self->phase == 0) {
|
|
mp_hal_delay_us_fast(delay_half);
|
|
mp_hal_pin_write(self->sck, 1 - self->polarity);
|
|
} else {
|
|
mp_hal_pin_write(self->sck, 1 - self->polarity);
|
|
mp_hal_delay_us_fast(delay_half);
|
|
}
|
|
data_in = (data_in << 1) | mp_hal_pin_read(self->miso);
|
|
if (self->phase == 0) {
|
|
mp_hal_delay_us_fast(delay_half);
|
|
mp_hal_pin_write(self->sck, self->polarity);
|
|
} else {
|
|
mp_hal_pin_write(self->sck, self->polarity);
|
|
mp_hal_delay_us_fast(delay_half);
|
|
}
|
|
}
|
|
if (dest != NULL) {
|
|
dest[i] = self->firstbit == MICROPY_PY_MACHINE_SPI_MSB ?
|
|
data_in : swap_bits(data_in);
|
|
}
|
|
}
|
|
}
|
|
|
|
const mp_spi_proto_t mp_soft_spi_proto = {
|
|
.ioctl = mp_soft_spi_ioctl,
|
|
.transfer = mp_soft_spi_transfer,
|
|
};
|