Hello, I am new to microcontroller programming. I am trying to read a digital microphone with a 24bit i2s interface. My problem is that the results I get are just uint16_t thus I loose some bits. I'm using st cube and HAL. The api documentation is:
/** * @brief Receive an amount of data in blocking mode * @param hi2s: pointer to a I2S_HandleTypeDef structure that contains * the configuration information for I2S module * @param pData: a 16-bit pointer to data buffer. * @param Size: number of data sample to be sent: * @note When a 16-bit data frame or a 16-bit data frame extended is selected during the I2S * configuration phase, the Size parameter means the number of 16-bit data length * in the transaction and when a 24-bit data frame or a 32-bit data frame is selected * the Size parameter means the number of 16-bit data length. * @param Timeout: Timeout duration * @note The I2S is kept enabled at the end of transaction to avoid the clock de-synchronization * between Master and Slave(example: audio streaming). * @note In I2S Master Receiver mode, just after enabling the peripheral the clock will be generate * in continuous way and as the I2S is not disabled at the end of the I2S transaction. * @retval HAL status */ HAL_StatusTypeDef HAL_I2S_Receive(I2S_HandleTypeDef *hi2s, uint16_t *pData, uint16_t Size, uint32_t Timeout)
uint16_t I2S_RX_BUFFER2; HAL_I2S_Receive(&hi2s1, (uint16_t*)I2S_RX_BUFFER2, 24, 0x1000);
My i2s is initialized for 24bit MSB first. How can I get 24bit results?