circuitpython/ports/cxd56/common-hal/busio/SPI.c

171 lines
4.9 KiB
C

/*
* This file is part of the MicroPython project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright 2019 Sony Semiconductor Solutions Corporation
*
* 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 <string.h>
#include <arch/chip/pin.h>
#include <cxd56_spi.h>
#include <cxd56_pinconfig.h>
#include "py/runtime.h"
#include "shared-bindings/busio/SPI.h"
#include "shared-bindings/microcontroller/Pin.h"
void common_hal_busio_spi_construct(busio_spi_obj_t *self, const mcu_pin_obj_t *clock,
const mcu_pin_obj_t *mosi, const mcu_pin_obj_t *miso, bool half_duplex) {
int port = -1;
if (half_duplex) {
mp_raise_NotImplementedError(translate("Half duplex SPI is not implemented"));
}
if (clock->number == PIN_SPI4_SCK &&
(mosi == NULL || mosi->number == PIN_SPI4_MOSI) &&
(miso == NULL || miso->number == PIN_SPI4_MISO)) {
port = 4;
CXD56_PIN_CONFIGS(PINCONFS_SPI4);
} else if (clock->number == PIN_EMMC_CLK &&
(mosi == NULL || mosi->number == PIN_EMMC_DATA0) &&
(miso == NULL || miso->number == PIN_EMMC_DATA1)) {
port = 5;
CXD56_PIN_CONFIGS(PINCONFS_EMMCA_SPI5);
}
if (port < 0) {
raise_ValueError_invalid_pins();
}
claim_pin(clock);
claim_pin(mosi);
claim_pin(miso);
self->clock_pin = clock;
self->mosi_pin = mosi;
self->miso_pin = miso;
self->spi_dev = cxd56_spibus_initialize(port);
}
void common_hal_busio_spi_deinit(busio_spi_obj_t *self) {
if (common_hal_busio_spi_deinited(self)) {
return;
}
self->spi_dev = NULL;
reset_pin_number(self->clock_pin->number);
reset_pin_number(self->mosi_pin->number);
reset_pin_number(self->miso_pin->number);
}
bool common_hal_busio_spi_deinited(busio_spi_obj_t *self) {
return self->spi_dev == NULL;
}
bool common_hal_busio_spi_configure(busio_spi_obj_t *self, uint32_t baudrate, uint8_t polarity, uint8_t phase, uint8_t bits) {
uint8_t mode;
self->frequency = baudrate;
SPI_SETFREQUENCY(self->spi_dev, baudrate);
if (polarity == 0) {
if (phase == 0) {
mode = SPIDEV_MODE0;
} else {
mode = SPIDEV_MODE1;
}
} else {
if (phase == 0) {
mode = SPIDEV_MODE2;
} else {
mode = SPIDEV_MODE3;
}
}
self->polarity = polarity;
self->phase = phase;
SPI_SETMODE(self->spi_dev, mode);
self->bits = bits;
SPI_SETBITS(self->spi_dev, bits);
return true;
}
bool common_hal_busio_spi_try_lock(busio_spi_obj_t *self) {
bool grabbed_lock = false;
if (!self->has_lock) {
grabbed_lock = true;
self->has_lock = true;
}
return grabbed_lock;
}
bool common_hal_busio_spi_has_lock(busio_spi_obj_t *self) {
return self->has_lock;
}
void common_hal_busio_spi_unlock(busio_spi_obj_t *self) {
self->has_lock = false;
}
bool common_hal_busio_spi_write(busio_spi_obj_t *self, const uint8_t *data, size_t len) {
SPI_EXCHANGE(self->spi_dev, data, NULL, len);
return true;
}
bool common_hal_busio_spi_read(busio_spi_obj_t *self, uint8_t *data, size_t len, uint8_t write_value) {
memset(data, write_value, len);
SPI_EXCHANGE(self->spi_dev, data, data, len);
return true;
}
bool common_hal_busio_spi_transfer(busio_spi_obj_t *self, const uint8_t *data_out, uint8_t *data_in, size_t len) {
SPI_EXCHANGE(self->spi_dev, data_out, data_in, len);
return true;
}
uint32_t common_hal_busio_spi_get_frequency(busio_spi_obj_t *self) {
return self->frequency;
}
uint8_t common_hal_busio_spi_get_phase(busio_spi_obj_t *self) {
return self->phase;
}
uint8_t common_hal_busio_spi_get_polarity(busio_spi_obj_t *self) {
return self->polarity;
}
void common_hal_busio_spi_never_reset(busio_spi_obj_t *self) {
never_reset_pin_number(self->clock_pin->number);
never_reset_pin_number(self->mosi_pin->number);
never_reset_pin_number(self->miso_pin->number);
}