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Posted by Do on May 30, 2013
Am trying to flash a led of an STM32-P107, i created a freertos code, i compiled the project without having errors but there is no result on the card, This is my code :

/ Standard includes. /

/ Scheduler includes. /
include \"FreeRTOS.h\"
include \"task.h\"
include \"queue.h\"
include \"semphr.h\"
include \"leds.h\"
include \"button.h\"
include \"stm32f10x_conf.h\"
include \"stm32_eval.h\"
include \"partest.h\"

/ Task priorities. /

/ Task priorities. /

/ The rate at which the flash task toggles the LED. /
define mainFLASH_DELAY ( ( portTickType ) 25 / portTICK_RATE_MS )

/ The number of nano seconds between each processor clock. /
define mainNS_PER_CLOCK ( ( unsigned portLONG ) ( ( 1.0 / ( double ) configCPU_CLOCK_HZ ) * 1000000000.0 ) )


* Configure the clocks, GPIO and other peripherals as required by the demo.
static void prvSetupHardware(void);

* The LCD is written two by more than one task so is controlled by a
* \'gatekeeper\' task. This is the only task that is actually permitted to
* access the LCD directly. Other tasks wanting to display a message send
* the message to the gatekeeper.
extern int sprintf(char out, const char format, ...);

xTaskHandle xTaskLed;
void vTaskFunction( void * pvParameters );
//void vTaskLed( void *pvParameters );


int main(void) {


/* Start the scheduler. */
printf(\"########################## MINI PROJET CS530 ################\\n\");

xTaskCreate(vTaskFunction,\"vTaskFunction\", configMINIMAL_STACK_SIZE+50 , NULL, TASKPRIORITY1,NULL);
// xTaskCreate( vTaskLed, \"vTaskLed\", configMINIMAL_STACK_SIZE+50, NULL, TASKPRIORITY2, &xTaskLed );
GPIO_WriteBit( GPIOC, GPIO_Pin_6,Bit_SET );

/* Will only get here if there was not enough heap space to create the
idle task. */
return 0;


static void prvSetupHardware(void) {

USART_InitTypeDef USART_InitStructure;

/* Enable GPIOA, GPIOB, GPIOC, GPIOD, GPIOE and AFIO clocks */

/* Set the Vector Table base address at 0x08000000 */


NVIC_SetVectorTable(NVIC_VectTab_FLASH_RELOCATED, 0x0);


NVIC_SetVectorTable( NVIC_VectTab_FLASH, 0x0 );



/* Configure HCLK clock as SysTick clock source. */

/* Configure UART */
USART_InitStructure.USART_BaudRate = 115200;
USART_InitStructure.USART_WordLength = USART_WordLength_8b;
USART_InitStructure.USART_StopBits = USART_StopBits_1;
USART_InitStructure.USART_Parity = USART_Parity_No;
USART_InitStructure.USART_HardwareFlowControl= USART_HardwareFlowControl_None;
USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;

STM_EVAL_COMInit(COM2, &USART_InitStructure);



void vTaskFunction( void * pvParameters )

const portTickType xDelay = 500 / portTICK_RATE_MS;

for( ;; )

vTaskDelay( xDelay );


and this the led.c code:
* leds.c

* Created on: Nov 8, 2011
* Author: MMM
include \"leds.h\"

void LEDsInit(void)
//GPIO structure used to initialize LED port
GPIO_InitTypeDef GPIO_InitStructure;
//Enable clock on APB2 pripheral bus where LEDs are connected
//select pins to initialize LED
GPIO_InitStructure.GPIO_Pin = LEDG|LEDB;
//select output push-pull mode
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
//highest speed available
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(LEDPORT, &GPIO_InitStructure);

void LEDToggle(uint32_t LEDn){

if(GPIO_ReadOutputDataBit(LEDPORT, LEDn)) //read previous state
GPIO_ResetBits(LEDPORT, LEDn); //set to zero
GPIO_SetBits(LEDPORT, LEDn);//set to one

what is wrong please?

RE: LedToggle

Posted by Richard on May 30, 2013
I can't comment on your hardware configuration code as that is very chip specific and outside of the scope of FreeRTOS support. However I do recommend ensuring each part of your application works individually before putting it together.

First, remove all the sprintf() and UART code to cut the project down to a minimum.

Next, if you have not done already, check the LED configuration and toggle code is working without FreeRTOS. Do this by simply calling the initialisation code, and the LED on and LED off code before the scheduler is started. Once you are sure the LED code is working you can start running FreeRTOS - then if the LED is not toggling you know it is not anything to do with the LED interfacing.

When you add in the FreeRTOS code, start with just a single task - the toggle task - again without any printfs or UART code. Put a break point at the beginning of the LED toggling task to ensure the task actually starts executing.

If you have any problems starting the scheduler then report back how far the code gets (step through it to see what happens).


RE: LedToggle

Posted by Do on May 31, 2013
I fixed the problem thank you

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