93 lines
1.7 KiB
C
93 lines
1.7 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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*
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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 BME280s accessed via SPI.
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*/
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#include <zephyr/logging/log.h>
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#include "bme280.h"
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#if BME280_BUS_SPI
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LOG_MODULE_DECLARE(BME280, CONFIG_SENSOR_LOG_LEVEL);
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static int bme280_bus_check_spi(const union bme280_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 int bme280_reg_read_spi(const union bme280_bus *bus,
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uint8_t start, uint8_t *buf, int size)
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{
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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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int i;
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rx_buf[0].buf = NULL;
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rx_buf[0].len = 1;
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rx_buf[1].len = 1;
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for (i = 0; i < size; i++) {
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int ret;
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addr = (start + i) | 0x80;
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rx_buf[1].buf = &buf[i];
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ret = spi_transceive_dt(&bus->spi, &tx, &rx);
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if (ret) {
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LOG_DBG("spi_transceive FAIL %d\n", ret);
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return ret;
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}
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}
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return 0;
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}
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static int bme280_reg_write_spi(const union bme280_bus *bus,
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uint8_t reg, uint8_t val)
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{
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uint8_t cmd[] = { reg & 0x7F, 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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int ret;
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ret = spi_write_dt(&bus->spi, &tx);
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if (ret) {
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LOG_DBG("spi_write FAIL %d\n", ret);
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return ret;
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}
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return 0;
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}
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const struct bme280_bus_io bme280_bus_io_spi = {
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.check = bme280_bus_check_spi,
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.read = bme280_reg_read_spi,
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.write = bme280_reg_write_spi,
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};
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#endif /* BME280_BUS_SPI */
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