len0rd/FreeRTOS-Kernel
1
0
Fork 0
mirror of https://github.com/FreeRTOS/FreeRTOS-Kernel.git synced 2025-08-20 01:58:32 -04:00
Code Issues Projects Releases Packages Wiki Activity

Continue 78K0R development.

Browse source
This commit is contained in:
Richard Barry 2009-02-05 13:01:37 +00:00
parent 617ddbb61f
commit e311bdb650
8 changed files with 226 additions and 151 deletions
Download patch file Download diff file Expand all files Collapse all files

46
Demo/NEC_78K0R_IAR/ButtonTask.c
View file

@ -47,35 +47,73 @@
licensing and training services.
*/
/*
* This file defines the button push task and ISR as described at the top of
* main.c. The ISR is called from a wrapper function defined in ButtonISR.s26.
*/
/* Kernel includes. */
#include "FreeRTOS.h"
#include "task.h"
#include "semphr.h"
/* The LED output used by the button push task. */
#define butLED1 P7_bit.no7
/* A short delay used for button debouncing. */
#define butDEBOUNCE_DELAY ( 200 / portTICK_RATE_MS )
/* The semaphore used to synchronise the button push task with the interrupt. */
static xSemaphoreHandle xButtonSemaphore;
#define LED01 P7_bit.no7
/*
* The definition of the button task itself. See the comments at the top of
* main.c.
*/
void vButtonTask( void *pvParameters )
{
/* Ensure the semaphore is created before it gets used. */
vSemaphoreCreateBinary( xButtonSemaphore );
for( ;; )
{
/* Block on the semaphore to wait for an interrupt event. The semaphore
is 'given' from vButtonISRHandler() below. Using portMAX_DELAY as the
block time will cause the task to block indefinitely provided
INCLUDE_vTaskSuspend is set to 1 in FreeRTOSConfig.h. */
xSemaphoreTake( xButtonSemaphore, portMAX_DELAY );
LED01 = !LED01;
/* The button must have been pushed for this line to be executed.
Simply toggle the LED. */
butLED1 = !butLED1;
vTaskDelay( 200 / portTICK_RATE_MS );
/* Wait a short time then clear any pending button pushes as a crude
method of debouncing the switch. xSemaphoreTake() uses a block time of
zero this time so it returns immediately rather than waiting for the
interrupt to occur. */
vTaskDelay( butDEBOUNCE_DELAY );
xSemaphoreTake( xButtonSemaphore, 0 );
}
}
/*-----------------------------------------------------------*/
/*
* The C portion of the interrupt handler. Interrupts are triggered by pushing
* the button on the target board. This interrupt can cause a context switch
* so has an assembly file wrapper defined within ButtonISR.s26.
*/
void vButtonISRHandler( void )
{
short sHigherPriorityTaskWoken = pdFALSE;
/* 'Give' the semaphore to unblock the button task. */
xSemaphoreGiveFromISR( xButtonSemaphore, &sHigherPriorityTaskWoken );
/* If giving the semaphore unblocked a task, and the unblocked task has a
priority that is higher than the currently running task, then
sHigherPriorityTaskWoken will have been set to pdTRUE. Passing a pdTRUE
value to portYIELD_FROM_ISR() will cause this interrupt to return directly
to the higher priority unblocked task. */
portYIELD_FROM_ISR( sHigherPriorityTaskWoken );
}
/*-----------------------------------------------------------*/