ruuvi.drivers.c ${PROJECT_VERSION}
Drivers for external sensors and peripherals on embedded systems.
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ruuvi_interface_i2c_bme280.c
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1#include "ruuvi_driver_enabled_modules.h"
2#if RI_BME280_ENABLED && RI_BME280_I2C_ENABLED
16#include <stdint.h>
17#include <string.h>
18
19#include "ruuvi_driver_error.h"
20#include "ruuvi_interface_gpio.h"
21#include "ruuvi_interface_i2c.h"
22#include "ruuvi_interface_yield.h"
23
24/*
25 * Data on the bus should be like
26 * |------------+---------------------|
27 * | I2C action | Data |
28 * |------------+---------------------|
29 * | Start | - |
30 * | Write | (reg_addr) |
31 * | Write | (reg_data[0]) |
32 * | Write | (....) |
33 * | Write | (reg_data[len - 1]) |
34 * | Stop | - |
35 * |------------+---------------------|
36 */
37int8_t ri_i2c_bme280_write (uint8_t dev_id, uint8_t reg_addr,
38 uint8_t * reg_data, uint16_t len)
39{
40 rd_status_t err_code = RD_SUCCESS;
41
42 // Support only 1-byte writes
43 if (1 > len || 2 < len) { return -1; }
44
45 uint8_t wbuf[2] = {0};
46 wbuf[0] = reg_addr;
47 wbuf[1] = reg_data[0];
48 err_code |= ri_i2c_write_blocking (dev_id, wbuf, 2, true);
49 return (RD_SUCCESS == err_code) ? 0 : -1;
50}
51
52/*
53 * Data on the bus should be like
54 * |------------+---------------------|
55 * | I2C action | Data |
56 * |------------+---------------------|
57 * | Start | - |
58 * | Write | (reg_addr) |
59 * | Stop | - |
60 * | Start | - |
61 * | Read | (reg_data[0]) |
62 * | Read | (....) |
63 * | Read | (reg_data[len - 1]) |
64 * | Stop | - |
65 * |------------+---------------------|
66 */
67
68int8_t ri_i2c_bme280_read (uint8_t dev_id, uint8_t reg_addr,
69 uint8_t * reg_data, uint16_t len)
70{
71 rd_status_t err_code = RD_SUCCESS;
72 err_code |= ri_i2c_write_blocking (dev_id, &reg_addr, 1, true);
73 err_code |= ri_i2c_read_blocking (dev_id, reg_data, len);
74 return (RD_SUCCESS == err_code) ? 0 : -1;
75}
76#endif
rd_status_t
uint32_t rd_status_t
bitfield for representing errors
Definition ruuvi_driver_error.h:54
RD_SUCCESS
#define RD_SUCCESS
Internal Error.
Definition ruuvi_driver_error.h:28
ri_i2c_bme280_read
int8_t ri_i2c_bme280_read(uint8_t dev_id, uint8_t reg_addr, uint8_t *p_reg_data, uint16_t len)
I2C Read function for BME280.
ri_i2c_bme280_write
int8_t ri_i2c_bme280_write(uint8_t dev_id, uint8_t reg_addr, uint8_t *p_reg_data, uint16_t len)
I2C write function for BME280.
ruuvi_driver_enabled_modules.h
Header to enable and disable module compilation.
ruuvi_driver_error.h
Ruuvi error codes and error check function.
ruuvi_interface_gpio.h
ruuvi_interface_i2c.h
Interface for I2C operations.
ri_i2c_write_blocking
rd_status_t ri_i2c_write_blocking(const uint8_t address, uint8_t *const p_tx, const size_t tx_len, const bool stop)
I2C read function.
ri_i2c_read_blocking
rd_status_t ri_i2c_read_blocking(const uint8_t address, uint8_t *const p_rx, const size_t rx_len)
I2C read function.
ruuvi_interface_yield.h