4a381fce6b
Use sizeof() and ARRAY_SIZE() to have more single points of truth. Signed-off-by: Martí Bolívar <marti.bolivar@nordicsemi.no>
110 lines
2.1 KiB
C
110 lines
2.1 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 <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 struct device *bus,
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const union bme280_bus_config *bus_config)
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{
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const struct spi_cs_control *cs;
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if (!device_is_ready(bus)) {
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LOG_DBG("SPI bus %s not ready", bus->name);
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return -ENODEV;
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}
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cs = bus_config->spi_cfg.cs;
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if (cs && !device_is_ready(cs->gpio_dev)) {
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LOG_DBG("SPI CS GPIO controller %s not ready",
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cs->gpio_dev->name);
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return -ENODEV;
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}
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return 0;
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}
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static int bme280_reg_read_spi(const struct device *bus,
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const union bme280_bus_config *bus_config,
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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(bus, &bus_config->spi_cfg, &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 struct device *bus,
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const union bme280_bus_config *bus_config,
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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(bus, &bus_config->spi_cfg, &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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