273 lines
8.3 KiB
C
273 lines
8.3 KiB
C
/*
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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) 2021 microDev
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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 <string.h>
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#include "py/runtime.h"
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#include "shared-bindings/busio/SPI.h"
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#include "driver/spi_common_internal.h"
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#define SPI_MAX_DMA_BITS (SPI_MAX_DMA_LEN * 8)
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static bool spi_never_reset[SOC_SPI_PERIPH_NUM];
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static spi_device_handle_t spi_handle[SOC_SPI_PERIPH_NUM];
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static bool spi_bus_is_free(spi_host_device_t host_id) {
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return spi_bus_get_attr(host_id) == NULL;
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}
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void spi_reset(void) {
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for (spi_host_device_t host_id = SPI2_HOST; host_id < SOC_SPI_PERIPH_NUM; host_id++) {
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if (spi_never_reset[host_id]) {
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continue;
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}
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if (!spi_bus_is_free(host_id)) {
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spi_bus_remove_device(spi_handle[host_id]);
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spi_bus_free(host_id);
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}
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}
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}
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static void set_spi_config(busio_spi_obj_t *self,
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uint32_t baudrate, uint8_t polarity, uint8_t phase, uint8_t bits) {
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const spi_device_interface_config_t device_config = {
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.clock_speed_hz = baudrate,
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.mode = phase | (polarity << 1),
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.spics_io_num = -1, // No CS pin
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.queue_size = 1,
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.pre_cb = NULL
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};
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esp_err_t result = spi_bus_add_device(self->host_id, &device_config, &spi_handle[self->host_id]);
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if (result != ESP_OK) {
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mp_raise_RuntimeError(translate("SPI configuration failed"));
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}
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self->baudrate = baudrate;
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self->polarity = polarity;
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self->phase = phase;
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self->bits = bits;
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}
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void common_hal_busio_spi_construct(busio_spi_obj_t *self,
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const mcu_pin_obj_t *clock, const mcu_pin_obj_t *mosi,
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const mcu_pin_obj_t *miso, bool half_duplex) {
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const spi_bus_config_t bus_config = {
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.mosi_io_num = mosi != NULL ? mosi->number : -1,
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.miso_io_num = miso != NULL ? miso->number : -1,
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.sclk_io_num = clock != NULL ? clock->number : -1,
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.quadwp_io_num = -1,
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.quadhd_io_num = -1,
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};
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if (half_duplex) {
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mp_raise_NotImplementedError(translate("Half duplex SPI is not implemented"));
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}
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for (spi_host_device_t host_id = SPI2_HOST; host_id < SOC_SPI_PERIPH_NUM; host_id++) {
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if (spi_bus_is_free(host_id)) {
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self->host_id = host_id;
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}
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}
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if (self->host_id == 0) {
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mp_raise_ValueError(translate("All SPI peripherals are in use"));
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}
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esp_err_t result = spi_bus_initialize(self->host_id, &bus_config, SPI_DMA_CH_AUTO);
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if (result == ESP_ERR_NO_MEM) {
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mp_raise_msg(&mp_type_MemoryError, translate("ESP-IDF memory allocation failed"));
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} else if (result == ESP_ERR_INVALID_ARG) {
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mp_raise_ValueError(translate("Invalid pins"));
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}
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set_spi_config(self, 250000, 0, 0, 8);
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self->MOSI = mosi;
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self->MISO = miso;
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self->clock = clock;
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if (mosi != NULL) {
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claim_pin(mosi);
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}
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if (miso != NULL) {
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claim_pin(miso);
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}
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claim_pin(clock);
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}
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void common_hal_busio_spi_never_reset(busio_spi_obj_t *self) {
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spi_never_reset[self->host_id] = true;
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common_hal_never_reset_pin(self->clock);
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if (self->MOSI != NULL) {
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common_hal_never_reset_pin(self->MOSI);
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}
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if (self->MISO != NULL) {
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common_hal_never_reset_pin(self->MISO);
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}
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}
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bool common_hal_busio_spi_deinited(busio_spi_obj_t *self) {
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return self->clock == NULL;
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}
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void common_hal_busio_spi_deinit(busio_spi_obj_t *self) {
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if (common_hal_busio_spi_deinited(self)) {
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return;
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}
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spi_never_reset[self->host_id] = false;
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spi_bus_remove_device(spi_handle[self->host_id]);
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spi_bus_free(self->host_id);
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common_hal_reset_pin(self->MOSI);
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common_hal_reset_pin(self->MISO);
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common_hal_reset_pin(self->clock);
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self->clock = NULL;
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}
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bool common_hal_busio_spi_configure(busio_spi_obj_t *self,
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uint32_t baudrate, uint8_t polarity, uint8_t phase, uint8_t bits) {
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if (baudrate == self->baudrate &&
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polarity == self->polarity &&
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phase == self->phase &&
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bits == self->bits) {
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return true;
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}
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spi_bus_remove_device(spi_handle[self->host_id]);
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set_spi_config(self, baudrate, polarity, phase, bits);
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return true;
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}
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bool common_hal_busio_spi_try_lock(busio_spi_obj_t *self) {
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bool grabbed_lock = false;
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if (!self->has_lock) {
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grabbed_lock = true;
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self->has_lock = true;
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}
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return grabbed_lock;
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}
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bool common_hal_busio_spi_has_lock(busio_spi_obj_t *self) {
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return self->has_lock;
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}
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void common_hal_busio_spi_unlock(busio_spi_obj_t *self) {
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self->has_lock = false;
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}
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bool common_hal_busio_spi_write(busio_spi_obj_t *self,
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const uint8_t *data, size_t len) {
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if (self->MOSI == NULL) {
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mp_raise_ValueError(translate("No MOSI Pin"));
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}
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return common_hal_busio_spi_transfer(self, data, NULL, len);
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}
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bool common_hal_busio_spi_read(busio_spi_obj_t *self,
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uint8_t *data, size_t len, uint8_t write_value) {
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if (self->MISO == NULL) {
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mp_raise_ValueError(translate("No MISO Pin"));
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}
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if (self->MOSI == NULL) {
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return common_hal_busio_spi_transfer(self, NULL, data, len);
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} else {
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memset(data, write_value, len);
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return common_hal_busio_spi_transfer(self, data, data, len);
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}
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}
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bool common_hal_busio_spi_transfer(busio_spi_obj_t *self,
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const uint8_t *data_out, uint8_t *data_in, size_t len) {
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if (len == 0) {
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return true;
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}
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// Other than the read special case, stop transfers that don't have a pin/array match
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if (!self->MOSI && (data_out != data_in)) {
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mp_raise_ValueError(translate("No MOSI Pin"));
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}
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if (!self->MISO && data_in) {
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mp_raise_ValueError(translate("No MISO Pin"));
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}
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spi_transaction_t transaction = { 0 };
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// Round to nearest whole set of bits
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int bits_to_send = len * 8 / self->bits * self->bits;
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if (len <= 4) {
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if (data_out != NULL) {
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memcpy(&transaction.tx_data, data_out, len);
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}
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transaction.flags = SPI_TRANS_USE_TXDATA | SPI_TRANS_USE_RXDATA;
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transaction.length = bits_to_send;
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spi_device_transmit(spi_handle[self->host_id], &transaction);
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if (data_in != NULL) {
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memcpy(data_in, &transaction.rx_data, len);
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}
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} else {
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int offset = 0;
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int bits_remaining = bits_to_send;
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while (bits_remaining && !mp_hal_is_interrupted()) {
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memset(&transaction, 0, sizeof(transaction));
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transaction.length =
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bits_remaining > SPI_MAX_DMA_BITS ? SPI_MAX_DMA_BITS : bits_remaining;
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if (data_out != NULL) {
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transaction.tx_buffer = data_out + offset;
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}
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if (data_in != NULL) {
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transaction.rx_buffer = data_in + offset;
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}
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spi_device_transmit(spi_handle[self->host_id], &transaction);
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bits_remaining -= transaction.length;
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// doesn't need ceil(); loop ends when bits_remaining is 0
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offset += transaction.length / 8;
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RUN_BACKGROUND_TASKS;
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}
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}
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return true;
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}
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uint32_t common_hal_busio_spi_get_frequency(busio_spi_obj_t *self) {
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return self->baudrate;
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}
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uint8_t common_hal_busio_spi_get_polarity(busio_spi_obj_t *self) {
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return self->polarity;
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}
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uint8_t common_hal_busio_spi_get_phase(busio_spi_obj_t *self) {
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return self->phase;
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}
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