135 lines
2.9 KiB
C
135 lines
2.9 KiB
C
/* ST Microelectronics LIS2DS12 3-axis accelerometer driver
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*
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* Copyright (c) 2019 STMicroelectronics
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*
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* SPDX-License-Identifier: Apache-2.0
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*
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* Datasheet:
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* https://www.st.com/resource/en/datasheet/lis2ds12.pdf
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*/
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#define DT_DRV_COMPAT st_lis2ds12
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#include <string.h>
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#include <drivers/spi.h>
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#include "lis2ds12.h"
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#include <logging/log.h>
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#if DT_ANY_INST_ON_BUS_STATUS_OKAY(spi)
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#define LIS2DS12_SPI_READ (1 << 7)
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LOG_MODULE_DECLARE(LIS2DS12, CONFIG_SENSOR_LOG_LEVEL);
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#if DT_INST_SPI_DEV_HAS_CS_GPIOS(0)
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static struct spi_cs_control lis2ds12_cs_ctrl;
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#endif
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static struct spi_config lis2ds12_spi_conf = {
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.frequency = DT_INST_PROP(0, spi_max_frequency),
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.operation = (SPI_OP_MODE_MASTER | SPI_MODE_CPOL |
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SPI_MODE_CPHA | SPI_WORD_SET(8) | SPI_LINES_SINGLE),
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.slave = DT_INST_REG_ADDR(0),
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.cs = NULL,
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};
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static int lis2ds12_spi_read(struct lis2ds12_data *data, uint8_t reg,
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uint8_t *value, uint16_t len)
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{
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struct spi_config *spi_cfg = &lis2ds12_spi_conf;
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uint8_t buffer_tx[2] = { reg | LIS2DS12_SPI_READ, 0 };
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const struct spi_buf tx_buf = {
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.buf = buffer_tx,
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.len = 2,
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};
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const struct spi_buf_set tx = {
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.buffers = &tx_buf,
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.count = 1
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};
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const struct spi_buf rx_buf[2] = {
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{
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.buf = NULL,
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.len = 1,
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},
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{
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.buf = value,
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.len = len,
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}
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};
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const struct spi_buf_set rx = {
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.buffers = rx_buf,
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.count = 2
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};
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if (spi_transceive(data->comm_master, spi_cfg, &tx, &rx)) {
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return -EIO;
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}
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return 0;
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}
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static int lis2ds12_spi_write(struct lis2ds12_data *data, uint8_t reg,
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uint8_t *value, uint16_t len)
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{
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struct spi_config *spi_cfg = &lis2ds12_spi_conf;
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uint8_t buffer_tx[1] = { reg & ~LIS2DS12_SPI_READ };
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const struct spi_buf tx_buf[2] = {
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{
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.buf = buffer_tx,
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.len = 1,
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},
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{
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.buf = value,
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.len = len,
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}
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};
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const struct spi_buf_set tx = {
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.buffers = tx_buf,
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.count = 2
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};
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if (spi_write(data->comm_master, spi_cfg, &tx)) {
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return -EIO;
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}
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return 0;
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}
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stmdev_ctx_t lis2ds12_spi_ctx = {
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.read_reg = (stmdev_read_ptr)lis2ds12_spi_read,
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.write_reg = (stmdev_write_ptr)lis2ds12_spi_write,
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};
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int lis2ds12_spi_init(const struct device *dev)
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{
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struct lis2ds12_data *data = dev->data;
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data->ctx = &lis2ds12_spi_ctx;
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data->ctx->handle = data;
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#if DT_INST_SPI_DEV_HAS_CS_GPIOS(0)
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/* handle SPI CS thru GPIO if it is the case */
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lis2ds12_cs_ctrl.gpio_dev = device_get_binding(
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DT_INST_SPI_DEV_CS_GPIOS_LABEL(0));
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if (!lis2ds12_cs_ctrl.gpio_dev) {
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LOG_ERR("Unable to get GPIO SPI CS device");
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return -ENODEV;
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}
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lis2ds12_cs_ctrl.gpio_pin = DT_INST_SPI_DEV_CS_GPIOS_PIN(0);
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lis2ds12_cs_ctrl.gpio_dt_flags = DT_INST_SPI_DEV_CS_GPIOS_FLAGS(0);
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lis2ds12_cs_ctrl.delay = 0U;
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lis2ds12_spi_conf.cs = &lis2ds12_cs_ctrl;
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LOG_DBG("SPI GPIO CS configured on %s:%u",
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DT_INST_SPI_DEV_CS_GPIOS_LABEL(0),
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DT_INST_SPI_DEV_CS_GPIOS_PIN(0));
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#endif
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return 0;
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}
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#endif /* DT_ANY_INST_ON_BUS_STATUS_OKAY(spi) */
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