147 lines
2.9 KiB
C
147 lines
2.9 KiB
C
/*
|
|
* Copyright (c) 2016, 2017 Intel Corporation
|
|
* Copyright (c) 2017 IpTronix S.r.l.
|
|
* Copyright (c) 2021 Nordic Semiconductor ASA
|
|
* Copyright (c) 2022, Leonard Pollak
|
|
*
|
|
* SPDX-License-Identifier: Apache-2.0
|
|
*/
|
|
|
|
/*
|
|
* Bus-specific functionality for BME680s accessed via SPI.
|
|
*/
|
|
|
|
#include <zephyr/logging/log.h>
|
|
#include "bme680.h"
|
|
|
|
#if BME680_BUS_SPI
|
|
|
|
LOG_MODULE_DECLARE(bme680, CONFIG_SENSOR_LOG_LEVEL);
|
|
|
|
static int bme680_bus_check_spi(const union bme680_bus *bus)
|
|
{
|
|
return spi_is_ready_dt(&bus->spi) ? 0 : -ENODEV;
|
|
}
|
|
|
|
static inline int bme680_set_mem_page(const struct device *dev, uint8_t addr)
|
|
{
|
|
const struct bme680_config *config = dev->config;
|
|
struct bme680_data *data = dev->data;
|
|
uint8_t page = (addr > 0x7f) ? 0U : 1U;
|
|
int err = 0;
|
|
|
|
if (data->mem_page != page) {
|
|
uint8_t buf[2];
|
|
|
|
struct spi_buf tx_buf = {
|
|
.buf = &buf[0],
|
|
.len = 1,
|
|
};
|
|
const struct spi_buf_set tx = {
|
|
.buffers = &tx_buf,
|
|
.count = 1,
|
|
};
|
|
|
|
const struct spi_buf rx_buf[] = {
|
|
{ .buf = NULL, .len = 1 },
|
|
{ .buf = &buf[1], .len = 1 },
|
|
};
|
|
const struct spi_buf_set rx = {
|
|
.buffers = rx_buf,
|
|
.count = ARRAY_SIZE(rx_buf),
|
|
};
|
|
|
|
buf[0] = BME680_REG_STATUS | BME680_SPI_READ_BIT;
|
|
err = spi_transceive_dt(&config->bus.spi, &tx, &rx);
|
|
if (err < 0) {
|
|
return err;
|
|
}
|
|
|
|
if (data->mem_page == 1U) {
|
|
buf[1] &= ~BME680_SPI_MEM_PAGE_MSK;
|
|
} else {
|
|
buf[1] |= BME680_SPI_MEM_PAGE_MSK;
|
|
}
|
|
|
|
buf[0] = BME680_REG_STATUS & BME680_SPI_WRITE_MSK;
|
|
tx_buf.len = 2;
|
|
err = spi_write_dt(&config->bus.spi, &tx);
|
|
if (err < 0) {
|
|
return err;
|
|
}
|
|
|
|
data->mem_page = page;
|
|
}
|
|
|
|
return err;
|
|
}
|
|
|
|
static int bme680_reg_write_spi(const struct device *dev,
|
|
uint8_t reg, uint8_t val)
|
|
{
|
|
const struct bme680_config *config = dev->config;
|
|
int err;
|
|
uint8_t cmd[] = { reg & BME680_SPI_WRITE_MSK, val };
|
|
const struct spi_buf tx_buf = {
|
|
.buf = cmd,
|
|
.len = sizeof(cmd)
|
|
};
|
|
const struct spi_buf_set tx = {
|
|
.buffers = &tx_buf,
|
|
.count = 1
|
|
};
|
|
|
|
err = bme680_set_mem_page(dev, reg);
|
|
if (err) {
|
|
return err;
|
|
}
|
|
|
|
err = spi_write_dt(&config->bus.spi, &tx);
|
|
|
|
return err;
|
|
}
|
|
|
|
static int bme680_reg_read_spi(const struct device *dev,
|
|
uint8_t start, uint8_t *buf, int size)
|
|
{
|
|
const struct bme680_config *config = dev->config;
|
|
int err;
|
|
uint8_t addr;
|
|
const struct spi_buf tx_buf = {
|
|
.buf = &addr,
|
|
.len = 1
|
|
};
|
|
const struct spi_buf_set tx = {
|
|
.buffers = &tx_buf,
|
|
.count = 1
|
|
};
|
|
struct spi_buf rx_buf[2];
|
|
const struct spi_buf_set rx = {
|
|
.buffers = rx_buf,
|
|
.count = ARRAY_SIZE(rx_buf)
|
|
};
|
|
|
|
rx_buf[0].buf = NULL;
|
|
rx_buf[0].len = 1;
|
|
|
|
addr = start | BME680_SPI_READ_BIT;
|
|
rx_buf[1].buf = buf;
|
|
rx_buf[1].len = size;
|
|
|
|
err = bme680_set_mem_page(dev, start);
|
|
if (err) {
|
|
return err;
|
|
}
|
|
|
|
err = spi_transceive_dt(&config->bus.spi, &tx, &rx);
|
|
|
|
return err;
|
|
}
|
|
|
|
const struct bme680_bus_io bme680_bus_io_spi = {
|
|
.check = bme680_bus_check_spi,
|
|
.read = bme680_reg_read_spi,
|
|
.write = bme680_reg_write_spi,
|
|
};
|
|
#endif /* BME680_BUS_SPI */
|