开发环境：mplab 3.45 harmony 1.09 xc32 1.42
源代码下载：http://download.csdn.net/detail/zn2857/9712707
源代码分析：
【技术|PIC32单片机harmony开发环境 - uart例程和代码分析】
void APP_Tasks ( void )
{/* Check the application's current state. */
switch ( appData.state )
{
/* Application's initial state. */
case APP_STATE_INIT:
{
bool appInitialized = true;
if (appInitialized)
{
/* Open the USART Driver for USART1 Client*/
appData.drvUartHandle = DRV_USART_Open( DRV_USART_INDEX_0,DRV_IO_INTENT_READWRITE );
appData.state = APP_STATE_CHECK_DRVR_STATE;
}
break;
}case APP_STATE_CHECK_DRVR_STATE:
{
/* Check the USART1 driver handler */
if (appData.drvUartHandle == DRV_HANDLE_INVALID )
{
/* Set the uart state to Ready */
appData.state = APP_STATE_INIT;
return;
}
DRV_USART_ByteReceiveCallbackSet(DRV_USART_INDEX_0, (DRV_USART_BYTE_EVENT_HANDLER)Uart_LoopBack);
appData.state = APP_STATE_IDLE;
break;
}case APP_STATE_SERVICE_TASKS:
{
uint8_t numBytes = 0;
while( numBytes < 1 )
{
numBytes++;
if( !(DRV_USART_TRANSFER_STATUS_TRANSMIT_FULL & DRV_USART_TransferStatus(appData.drvUartHandle)) )
{
DRV_USART_WriteByte(appData.drvUartHandle, temp);
}
}
appData.state = APP_STATE_IDLE;
break;
}case APP_STATE_IDLE:
{
break;
}
/* TODO: implement your application state machine.*//* The default state should never be executed. */
default:
{
/* TODO: Handle error in application's state machine. */
break;
}
}
}
