106 lines
2.1 KiB
C
106 lines
2.1 KiB
C
/* ST Microelectronics IIS2DH 3-axis accelerometer driver
|
|
*
|
|
* Copyright (c) 2020 STMicroelectronics
|
|
*
|
|
* SPDX-License-Identifier: Apache-2.0
|
|
*
|
|
* Datasheet:
|
|
* https://www.st.com/resource/en/datasheet/iis2dh.pdf
|
|
*/
|
|
|
|
#define DT_DRV_COMPAT st_iis2dh
|
|
|
|
#include <string.h>
|
|
#include "iis2dh.h"
|
|
#include <zephyr/logging/log.h>
|
|
|
|
#if DT_ANY_INST_ON_BUS_STATUS_OKAY(spi)
|
|
|
|
#define IIS2DH_SPI_READM (3 << 6) /* 0xC0 */
|
|
#define IIS2DH_SPI_WRITEM (1 << 6) /* 0x40 */
|
|
|
|
LOG_MODULE_DECLARE(IIS2DH, CONFIG_SENSOR_LOG_LEVEL);
|
|
|
|
static int iis2dh_spi_read(const struct device *dev, uint8_t reg, uint8_t *data, uint16_t len)
|
|
{
|
|
const struct iis2dh_device_config *config = dev->config;
|
|
uint8_t buffer_tx[2] = { reg | IIS2DH_SPI_READM, 0 };
|
|
const struct spi_buf tx_buf = {
|
|
.buf = buffer_tx,
|
|
.len = 2,
|
|
};
|
|
const struct spi_buf_set tx = {
|
|
.buffers = &tx_buf,
|
|
.count = 1
|
|
};
|
|
const struct spi_buf rx_buf[2] = {
|
|
{
|
|
.buf = NULL,
|
|
.len = 1,
|
|
},
|
|
{
|
|
.buf = data,
|
|
.len = len,
|
|
}
|
|
};
|
|
const struct spi_buf_set rx = {
|
|
.buffers = rx_buf,
|
|
.count = 2
|
|
};
|
|
|
|
if (spi_transceive_dt(&config->spi, &tx, &rx)) {
|
|
return -EIO;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int iis2dh_spi_write(const struct device *dev, uint8_t reg, uint8_t *data, uint16_t len)
|
|
{
|
|
const struct iis2dh_device_config *config = dev->config;
|
|
uint8_t buffer_tx[1] = { reg | IIS2DH_SPI_WRITEM };
|
|
const struct spi_buf tx_buf[2] = {
|
|
{
|
|
.buf = buffer_tx,
|
|
.len = 1,
|
|
},
|
|
{
|
|
.buf = data,
|
|
.len = len,
|
|
}
|
|
};
|
|
const struct spi_buf_set tx = {
|
|
.buffers = tx_buf,
|
|
.count = 2
|
|
};
|
|
|
|
|
|
if (spi_write_dt(&config->spi, &tx)) {
|
|
return -EIO;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
stmdev_ctx_t iis2dh_spi_ctx = {
|
|
.read_reg = (stmdev_read_ptr) iis2dh_spi_read,
|
|
.write_reg = (stmdev_write_ptr) iis2dh_spi_write,
|
|
};
|
|
|
|
int iis2dh_spi_init(const struct device *dev)
|
|
{
|
|
struct iis2dh_data *data = dev->data;
|
|
const struct iis2dh_device_config *config = dev->config;
|
|
|
|
if (!spi_is_ready(&config->spi)) {
|
|
LOG_ERR("Bus device is not ready");
|
|
return -ENODEV;
|
|
}
|
|
|
|
data->ctx = &iis2dh_spi_ctx;
|
|
data->ctx->handle = (void *)dev;
|
|
|
|
return 0;
|
|
}
|
|
#endif /* DT_ANY_INST_ON_BUS_STATUS_OKAY(spi) */
|