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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 2 | mjames | 1 | #include "main.h" |
| 2 | #include "libBMP280/bmp280.h" |
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| 3 | /* USER CODE BEGIN PV */ |
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| 4 | typedef struct |
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| 5 | { |
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| 6 | uint8_t dev_addr; |
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| 7 | } interface_t; |
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| 8 | |||
| 18 | mjames | 9 | // interface code |
| 2 | mjames | 10 | /// pointer to I2C hardware |
| 18 | mjames | 11 | static I2C_HandleTypeDef *hi2c; |
| 2 | mjames | 12 | |
| 13 | /// @brief Generic I2C write function |
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| 14 | /// @param i2c_addr I2C address |
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| 15 | /// @param reg_addr I2C register address |
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| 16 | /// @param reg_data pointer to data buffer to send |
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| 17 | /// @param len length of data to send |
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| 18 | mjames | 18 | /// @return |
| 2 | mjames | 19 | static int8_t |
| 20 | user_i2c_write(uint8_t i2c_addr, uint8_t reg_addr, uint8_t *reg_data, |
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| 18 | mjames | 21 | uint16_t len) |
| 2 | mjames | 22 | { |
| 23 | HAL_StatusTypeDef st = HAL_I2C_Mem_Write(hi2c, i2c_addr << 1, reg_addr, 1, |
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| 24 | reg_data, len, 1000); |
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| 25 | |||
| 26 | return st != HAL_OK ? BMP280_E_COMM_FAIL : BMP280_OK; |
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| 27 | } |
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| 28 | |||
| 29 | /// @brief Generic I2C read function |
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| 30 | /// @param i2c_addr I2C address |
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| 31 | /// @param reg_addr I2C register address |
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| 32 | /// @param reg_data pointer to data buffer to fill |
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| 33 | /// @param len length of data to receive |
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| 18 | mjames | 34 | /// @return status code |
| 2 | mjames | 35 | static int8_t |
| 18 | mjames | 36 | user_i2c_read(uint8_t i2c_addr, |
| 37 | uint8_t reg_addr, |
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| 38 | uint8_t *reg_data, |
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| 39 | uint16_t len) |
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| 2 | mjames | 40 | { |
| 41 | HAL_StatusTypeDef st = HAL_I2C_Mem_Read(hi2c, i2c_addr << 1, reg_addr, 1, |
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| 42 | reg_data, len, 1000); |
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| 43 | |||
| 44 | return st != HAL_OK ? BMP280_E_COMM_FAIL : BMP280_OK; |
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| 45 | } |
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| 46 | |||
| 47 | static void |
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| 18 | mjames | 48 | user_delay_ms(uint32_t ms) |
| 2 | mjames | 49 | { |
| 50 | HAL_Delay(ms); |
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| 51 | } |
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| 52 | |||
| 53 | struct bmp280_dev bmp = |
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| 54 | { |
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| 55 | .intf = BMP280_I2C_INTF, |
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| 56 | .read = user_i2c_read, |
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| 57 | .write = user_i2c_write, |
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| 58 | .delay_ms = user_delay_ms, |
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| 59 | |||
| 60 | /* Update interface pointer with the structure that contains both device address and file descriptor */ |
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| 61 | .dev_id = BMP280_I2C_ADDR_PRIM}; |
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| 62 | |||
| 63 | struct bmp280_config conf; |
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| 64 | |||
| 18 | mjames | 65 | uint8_t init_bmp(I2C_HandleTypeDef *i2c) |
| 2 | mjames | 66 | { |
| 18 | mjames | 67 | // copy the I2c handle over |
| 68 | hi2c = i2c; |
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| 2 | mjames | 69 | int8_t rslt = bmp280_init(&bmp); |
| 70 | if (rslt != BMP280_OK) |
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| 71 | return rslt; |
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| 72 | |||
| 73 | rslt = bmp280_get_config(&conf, &bmp); |
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| 74 | if (rslt != BMP280_OK) |
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| 75 | return rslt; |
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| 76 | /* configuring the temperature oversampling, filter coefficient and output data rate */ |
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| 77 | /* Overwrite the desired settings */ |
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| 13 | mjames | 78 | conf.filter = BMP280_FILTER_COEFF_4; |
| 2 | mjames | 79 | |
| 80 | /* Temperature oversampling set at 4x */ |
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| 13 | mjames | 81 | conf.os_temp = BMP280_OS_1X; |
| 2 | mjames | 82 | |
| 83 | /* Pressure over sampling none (disabling pressure measurement) */ |
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| 84 | conf.os_pres = BMP280_OS_4X; |
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| 85 | |||
| 13 | mjames | 86 | /* Setting the output data rate as 8HZ(500ms) */ |
| 87 | conf.odr = BMP280_ODR_125_MS; |
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| 2 | mjames | 88 | rslt = bmp280_set_config(&conf, &bmp); |
| 89 | if (rslt != BMP280_OK) |
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| 90 | return rslt; |
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| 91 | |||
| 92 | /* Always set the power mode after setting the configuration */ |
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| 93 | rslt = bmp280_set_power_mode(BMP280_NORMAL_MODE, &bmp); |
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| 18 | mjames | 94 | return rslt; |
| 2 | mjames | 95 | } |