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Comment and spell check the STM32L152 demo project.

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This commit is contained in:
Richard Barry 2010-12-23 17:04:34 +00:00
parent 556fc15e99
commit ecc01bdbe8
6 changed files with 309 additions and 73 deletions
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26
Demo/Cortex_STM32L152_IAR/serial.c
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@ -53,6 +53,15 @@
/*
BASIC INTERRUPT DRIVEN SERIAL PORT DRIVER FOR UART0.
***Note*** This example uses queues to send each character into an interrupt
service routine and out of an interrupt service routine individually. This
is done to demonstrate queues being used in an interrupt, and to deliberately
load the system to test the FreeRTOS port. It is *NOT* meant to be an
example of an efficient implementation. An efficient implementation should
use FIFO's or DMA if available, and only use FreeRTOS API functions when
enough has been received to warrant a task being unblocked to process the
data.
*/
/* Scheduler includes. */
@ -71,7 +80,6 @@
/* Misc defines. */
#define serINVALID_QUEUE ( ( xQueueHandle ) 0 )
#define serNO_BLOCK ( ( portTickType ) 0 )
#define serTX_BLOCK_TIME ( 40 / portTICK_RATE_MS )
/*-----------------------------------------------------------*/
@ -94,7 +102,7 @@ NVIC_InitTypeDef NVIC_InitStructure;
xRxedChars = xQueueCreate( uxQueueLength, ( unsigned portBASE_TYPE ) sizeof( signed portCHAR ) );
xCharsForTx = xQueueCreate( uxQueueLength + 1, ( unsigned portBASE_TYPE ) sizeof( signed portCHAR ) );
/* If the queue/semaphore was created correctly then setup the serial port
/* If the queues were created correctly then setup the serial port
hardware. */
if( ( xRxedChars != serINVALID_QUEUE ) && ( xCharsForTx != serINVALID_QUEUE ) )
{
@ -200,12 +208,12 @@ portCHAR cChar;
if( USART_GetITStatus( USART3, USART_IT_TXE ) == SET )
{
/* The interrupt was caused by the THR becoming empty. Are there any
more characters to transmit? */
/* The interrupt was caused by the TX register becoming empty. Are
there any more characters to transmit? */
if( xQueueReceiveFromISR( xCharsForTx, &cChar, &xHigherPriorityTaskWoken ) == pdTRUE )
{
/* A character was retrieved from the queue so can be sent to the
THR now. */
USART now. */
USART_SendData( USART3, cChar );
}
else
@ -216,10 +224,18 @@ portCHAR cChar;
if( USART_GetITStatus( USART3, USART_IT_RXNE ) == SET )
{
/* A character has been received on the USART, send it to the Rx
handler task. */
cChar = USART_ReceiveData( USART3 );
xQueueSendFromISR( xRxedChars, &cChar, &xHigherPriorityTaskWoken );
}
/* If sending or receiving from a queue has caused a task to unblock, and
the unblocked task has a priority equal to or higher than the currently
running task (the task this ISR interrupted), then xHigherPriorityTaskWoken
will have automatically been set to pdTRUE within the queue send or receive
function. portEND_SWITCHING_ISR() will then ensure that this ISR returns
directly to the higher priority unblocked task. */
portEND_SWITCHING_ISR( xHigherPriorityTaskWoken );
}