cancel
Showing results for 
Search instead for 
Did you mean: 

PSoC 4 MCU

Anonymous
Not applicable

I am writting a code in FreeRTOS with PSoC 4. I am writting a code to read the output from an LDR and transmit it through USART. 

   

Initial it is showing 4000-4900. when i turn off the light. The value reduces to something around 900 and then the adc stops working. Unless it continuously transmit adc values. Please help

   

int main( void )
{   
    #if 1
    CyGlobalIntEnable;
    UART_1_Start() ;
    UART_1_PutString("Hello");
    LED_DEF_Write(pdFALSE);
    ADC_SAR_1_Start();
    ADC_SAR_1_IRQ_Start();
    count = 0;
    /* Place your initialization/startup code here (e.g. MyInst_Start()) */
    prvHardwareSetup();
   // Switch1_Queue = xQueueCreate(5,sizeof(int));
    vSemaphoreCreateBinary(ADC_sem);
    vSemaphoreCreateBinary(UART_semphr);
    

   

    /* Create the LED_BLUE blink task */
      ( void ) xTaskCreate( UART_TEMP_Task, "Blink", BLINK_STACK_SIZE, NULL, UART_TEMP_Priority, NULL );

   

    
    /* Create the Switch Control Task blink task2 */
      // ( void ) xTaskCreate(TEST1, "Blink", BLINK_STACK_SIZE, NULL, TEST1_PRIORITY, NULL );
    xSemaphoreGive( ADC_sem );
    xSemaphoreGive( UART_semphr );
    // xSemaphoreTake(ADC_sem,portMAX_DELAY); 
    /* Start the OS */
    vTaskStartScheduler();
    
    /*NOTREACHED*/
    for(;;);
    # endif
}

   

 

   

 

   

 

   

 

   

static void UART_TEMP_Task(void *parm)
{
    UART_1_PutChar(0x0c);

   

    while( FOREVER )
    {
        LED_DEF_Write( 1 );
        ADC_SAR_1_StartConvert();
        ADC_SAR_1_IRQ_Start();
        if(xSemaphoreTake(ADC_sem,portMAX_DELAY)==pdPASS)
        {
            adcresult -= (~adcresult)&0x0FFF;
            adcresult++;
            sprintf( adcstr, "%d",adcresult );
            UART_1_PutChar('\r');
            UART_1_PutChar('\n');

   

            UART_1_PutString(adcstr);

   

        }
        vTaskDelay(100);

   

    }
}

   

 

   

CY_ISR(ADC_SAR_1_IRQ_Interrupt)
{

    static BaseType_t xHigherPriorityTaskWoken;
    xHigherPriorityTaskWoken = pdFALSE;
    adcresult = ADC_SAR_1_GetResult16();
    xSemaphoreGiveFromISR(ADC_sem, &xHigherPriorityTaskWoken);

}

0 Likes
Reply
1 Reply
Anonymous
Not applicable

hmm. I would disable all the lines. Put the initialization outside the loop.

   

Then add a single line for each step. Verify. Add second line... One device and one thing per time. It will work

0 Likes
Reply