Posted on April 28, 2016 at 17:40Hello,
I am trying to read a digital mems microphone that sends 24 bit via i2s. My problem is that I only receive 16 bit values and that the hal documentation is kind of confusing to me (probably because I am new to microcontroller programming). \\
I tried:\\
uint8_t sample=2;
uint16_t I2S_RX_BUFFER2[sample];
ReadStatus= HAL_I2S_Receive(&hi2s1, (uint16_t*)I2S_RX_BUFFER2, sample, 0x1000);
The values I get are between 0 and 65.535.\\
The relevant documentation:\\
**
* @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:
''''''''This note confuses me:''''''
* @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.
[ ...]
HAL_StatusTypeDef HAL_I2S_Receive(I2S_HandleTypeDef *hi2s, uint16_t *pData, uint16_t Size, uint32_t Timeout)
So my question is what did I do wrong when setting the parameters and how can I improve it.
#i2s #stm32 #hal #cubemx
