Hi,
I am having difficulty implenting low power modes combined with using the FreeRTOS platform and the PSoC 5. Specifically, UART comms are getting corrupted.
I have a task which receives messages to send to the UART. When it receives a message, it prevents the uC from sleeping, wakes the uart up, and then sends the message using the API (Uart_PutSring()). It then waits until the message is sent before allowing the micro to sleep and sleeping the uart itself.
Some messages are getting through un-corrupted, others are a horrible mess...
Here is a code snippet of the UART task...
//! @brief Main debug uart task
//! @param *pvParameters Void pointer (not used)
//! @note Not thread-safe. Do not call from any task, this function is a task that
//! is called by the FreeRTOS kernel
//! @public
void vDebugUart_MainTask(void *pvParameters)
{
// Sleep uart
UART_DEBUG_Sleep();
uint8 *message;
for(;;)
{
// Wait for a message pointer to arrive in the queue
xQueueReceive(xDebugUartTxQueue, &message, portMAX_DELAY);
#if(DEBUG_LEDS == 1)
DebugUart_FlashLed();
#endif
// Message must of been received, so now prevent micro from sleeping and send
PowerMgmt_SleepLock();
// Wakeup UART
UART_DEBUG_Wakeup();
UART_DEBUG_PutString(message);
//vTaskDelay(200/portTICK_RATE_MS);
// Wait until UART has completely finished sending the message
// (both the hardware buffer and the byte sent flag are set)
while(!(UART_DEBUG_ReadTxStatus() & (UART_DEBUG_TX_STS_FIFO_EMPTY | UART_DEBUG_TX_STS_COMPLETE))); //(software wait)
//while(!(UART_DEBUG_ReadTxStatus() & UART_DEBUG_TX_STS_COMPLETE));
// Sleep uart
UART_DEBUG_Sleep();
// Now it is safe to unlock the micro to allow for sleeping
PowerMgmt_SleepUnlock();
// Finished, now loop for next message
}
}
Cheers, Geoff
