I am attempting to talk to BMP280 over SPI using Nucelo-F401RE.
I am using SPI2 on the F401RE board to do so, I am able to read from it correctly but I can't seem to write to it in order to communicate with it.
My code is as follows
/* USER CODE BEGIN WHILE */
HAL_GPIO_WritePin(GPIOB, GPIO_PIN_0, GPIO_PIN_SET); // Setting this high, to not select the chip
char send_buff [8] = {0,0,0,0,0,0,0,0};
char recieve_buff_0 [8] = {0,0,0,0,0,0,0,0};
char recieve_buff_1 [8] = {0,0,0,0,0,0,0,0};
HAL_StatusTypeDef ret;
while (1)
{
HAL_GPIO_WritePin(GPIOB, GPIO_PIN_0, GPIO_PIN_RESET); // Setting this low to enable the chip
send_buff[0] = 208;
ret = HAL_SPI_Transmit(&hspi2, send_buff, 1, 1000); // Reading the register ID
ret = HAL_SPI_Receive(&hspi2, recieve_buff_0, 1, 1000); // I receive 88 (0x58) back which is correct
HAL_GPIO_WritePin(GPIOB, GPIO_PIN_0, GPIO_PIN_SET); // Setting this high, to not select the chip
HAL_GPIO_WritePin(GPIOB, GPIO_PIN_0, GPIO_PIN_RESET); // Setting this low to enable the chip
send_buff[0] = 244;
send_buff[1] = 39;
ret = HAL_SPI_Transmit(&hspi2, send_buff, 2, 1000); // Reading the ctrl_meas register
ret = HAL_SPI_Receive(&hspi2, recieve_buff_1, 1, 1000); // Should receive 39 but getting back all 0s
HAL_GPIO_WritePin(GPIOB, GPIO_PIN_0, GPIO_PIN_SET); // Setting this high, to not select the chip
/* USER CODE END WHILE */
/* USER CODE BEGIN 3 */
}
/* USER CODE END 3 */
}
My SPI settings are as it follows:
I have attached the bmp280 datasheet as well as the main.c file for my project.
I have attached some images of my project. (I have got this sensor working with I2C and searched the internet for a possible solution but every git repo seems to only have it working with I2C not SPI).
