Use UART DMA with X-CUBE-CELLULAR

[SL61]

Hi everyone,

​

I am using X-CUBE-CELLULAR v6.0 and would like to use DMA on UART to replace the original interrupt receiving method.

​

The original method is calling IPC_RXFIFO_writeCharacter() in HAL_UART_RxCpltCallback() and notify upper layer when an end of message is received.

Seems I need to modify the functions above and the codes below in ATCoreTaskBody() to receive a block of UART bytes and parse them in ATCoreTaskBody()

 if (msg == (SIG_IPC_MSG))
 {
 /* retrieve message from IPC */
 if (IPC_receive(&ipcHandleTab, &msgFromIPC) == IPC_ERROR)
 {
 TRACE_DBG("IPC receive error")
 ATParser_abort_request(&at_context);
 TRACE_DBG("**** Sema Released on error 1 *****")
 (void) rtosalSemaphoreRelease(s_WaitAnswer_SemaphoreId);
 /* skip this loop iteration */
 continue;
 }
 
 /* one message has been read */
 IRQ_DISABLE();
 MsgReceived--;
 IRQ_ENABLE();
 
 /* Parse the response */
#if (USE_PARSING_MUTEX == 1)
 (void)rtosalMutexAcquire(ATCore_ParsingMutexHandle, RTOSAL_WAIT_FOREVER);
#endif /* USE_PARSING_MUTEX == 1 */
 action = ATParser_parse_rsp(&at_context, &msgFromIPC);
#if (USE_PARSING_MUTEX == 1)
 (void)rtosalMutexRelease(ATCore_ParsingMutexHandle);
#endif /* USE_PARSING_MUTEX == 1 */
 
 /* analyze the response (check data mode flag) */
 action = analyze_action_result(action);
 
 /* add this action to action flags only if this kind of action will be treated later */
 if ((action == ATACTION_RSP_FRC_END)
 || (action == ATACTION_RSP_FRC_CONTINUE)
 || (action == ATACTION_RSP_ERROR))
 {
 at_context.action_flags |= action;
 TRACE_DBG("add action 0x%x (flags=0x%x)", action, at_context.action_flags)
 }
 if (action == ATACTION_RSP_ERROR)
 {
 TRACE_ERR("AT_sendcmd error")
 ATParser_abort_request(&at_context);
 TRACE_DBG("**** Sema Released on error 2 *****")
 (void) rtosalSemaphoreRelease(s_WaitAnswer_SemaphoreId);
 continue;
 }
 
 /* check if this is an URC to forward */
 if (action == ATACTION_RSP_URC_FORWARDED)
 {
 /* notify user with callback */
 if (register_URC_callback != NULL)
 {
 /* get URC response buffer */
 do
 {
 (void) memset((void *) urc_buf, 0, ATCMD_MAX_BUF_SIZE);
 retUrc = ATParser_get_urc(&at_context, urc_buf);
 if ((retUrc == ATSTATUS_OK) || (retUrc == ATSTATUS_OK_PENDING_URC))
 {
 /* call the URC callback */
 (* register_URC_callback)(urc_buf);
 }
 } while (retUrc == ATSTATUS_OK_PENDING_URC);
 }
 }
 else if ((action == ATACTION_RSP_FRC_CONTINUE) ||
 (action == ATACTION_RSP_FRC_END) ||
 (action == ATACTION_RSP_ERROR))
 {
 TRACE_DBG("**** Sema released *****")
 (void) rtosalSemaphoreRelease(s_WaitAnswer_SemaphoreId);
 }
 else
 {
 /* nothing to do */
 }
 }

Any suggestion is welcome.

Best,

Sean