125 lines
2.5 KiB
C
125 lines
2.5 KiB
C
/*
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* Copyright (c) 2016, 2017 Intel Corporation
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* Copyright (c) 2017 IpTronix S.r.l.
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* Copyright (c) 2021 Nordic Semiconductor ASA
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* Copyright (c) 2022, Leonard Pollak
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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/*
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* Bus-specific functionality for BME680s accessed via SPI.
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*/
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#include <zephyr/logging/log.h>
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#include "bme680.h"
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#if BME680_BUS_SPI
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LOG_MODULE_DECLARE(bme680, CONFIG_SENSOR_LOG_LEVEL);
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static int bme680_bus_check_spi(const union bme680_bus *bus)
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{
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return spi_is_ready(&bus->spi) ? 0 : -ENODEV;
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}
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static inline int bme680_set_mem_page(const struct device *dev, uint8_t addr)
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{
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const struct bme680_config *config = dev->config;
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struct bme680_data *data = dev->data;
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uint8_t page;
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int err = 0;
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if (addr > 0x7f) {
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page = BME680_MEM_PAGE1;
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} else {
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page = BME680_MEM_PAGE0;
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}
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if (data->mem_page != page) {
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data->mem_page = page;
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uint8_t cmd[] = { BME680_REG_MEM_PAGE & BME680_SPI_WRITE_MSK, data->mem_page };
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const struct spi_buf tx_buf = {
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.buf = cmd,
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.len = sizeof(cmd)
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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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err = spi_write_dt(&config->bus.spi, &tx);
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}
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return err;
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}
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static int bme680_reg_write_spi(const struct device *dev,
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uint8_t reg, uint8_t val)
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{
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const struct bme680_config *config = dev->config;
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int err;
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uint8_t cmd[] = { reg & BME680_SPI_WRITE_MSK, val };
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const struct spi_buf tx_buf = {
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.buf = cmd,
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.len = sizeof(cmd)
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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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err = bme680_set_mem_page(dev, reg);
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if (err) {
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return err;
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}
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err = spi_write_dt(&config->bus.spi, &tx);
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return err;
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}
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static int bme680_reg_read_spi(const struct device *dev,
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uint8_t start, uint8_t *buf, int size)
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{
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const struct bme680_config *config = dev->config;
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int err;
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uint8_t addr;
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const struct spi_buf tx_buf = {
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.buf = &addr,
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.len = 1
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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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struct spi_buf rx_buf[2];
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const struct spi_buf_set rx = {
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.buffers = rx_buf,
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.count = ARRAY_SIZE(rx_buf)
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};
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rx_buf[0].buf = NULL;
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rx_buf[0].len = 1;
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addr = start | BME680_SPI_READ_BIT;
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rx_buf[1].buf = buf;
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rx_buf[1].len = size;
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err = bme680_set_mem_page(dev, start);
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if (err) {
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return err;
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}
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err = spi_transceive_dt(&config->bus.spi, &tx, &rx);
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return err;
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}
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const struct bme680_bus_io bme680_bus_io_spi = {
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.check = bme680_bus_check_spi,
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.read = bme680_reg_read_spi,
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.write = bme680_reg_write_spi,
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};
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#endif /* BME680_BUS_SPI */
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