STM32WL55: Subghz RADIO_GET_STATUS returns invalid data.

Hi,

i'm currently working on a Project where i need to send some data via LoRa.

I've been struggeling to get a transmission going, so i decided to check the basics.

To test the radio, i went ahead and rebuilt the SUBGHZ_Tx_Mode example from the STMCubeWL on my board, implementing the exact code that the example uses.

The MX setup is identical .

When i tested, i found that the code fails the first time that data is received with this function call.

if (HAL_SUBGHZ_ExecGetCmd(&hsubghz, RADIO_GET_STATUS, &RadioResult, 1) != HAL_OK)
 {
 Error_Handler();
 }

HAL_StatusTypeDef HAL_SUBGHZ_ExecGetCmd(SUBGHZ_HandleTypeDef *hsubghz,
 SUBGHZ_RadioGetCmd_t Command,
 uint8_t *pBuffer,
 uint16_t Size)
{
 HAL_StatusTypeDef status;
 uint8_t *pData = pBuffer;
 
 if (hsubghz->State == HAL_SUBGHZ_STATE_READY)
 {
 /* Process Locked */
 __HAL_LOCK(hsubghz);
 
 ret = SUBGHZ_CheckDeviceReady(hsubghz);
 
 /* NSS = 0 */
 LL_PWR_SelectSUBGHZSPI_NSS();
 
 ret = SUBGHZSPI_Transmit(hsubghz, (uint8_t)Command);
 
 /* Use to flush the Status (First byte) receive from SUBGHZ as not use */
 (void)SUBGHZSPI_Transmit(hsubghz, 0x00U);
 
 for (uint16_t i = 0U; i < Size; i++)
 {
 ret = SUBGHZSPI_Receive(hsubghz, (pData));
 pData++;
 }
 
 /* NSS = 1 */
 LL_PWR_UnselectSUBGHZSPI_NSS();
 
 (void)SUBGHZ_WaitOnBusy(hsubghz);
 
 if (hsubghz->ErrorCode != HAL_SUBGHZ_ERROR_NONE)
 {
 status = HAL_ERROR;
 }
 else
 {
 status = HAL_OK;
 }

More specifically, the SUBGHZSPI_Receive function fills the byte with 0xFF, when the expected values go from 2 to 6.

I checked the return value of SUBGHZSPI_Receive, and it returns HAL_OK.

My question now is: Why does this happen and how can i fix this?

Any help is greatly appreciated.