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Why Does the TSC counter Increse and  after a time Fall Down(like sawtooth wave)?

Question asked by Mohammad Rostamian on Jun 20, 2017
Latest reply on Jul 1, 2017 by Mohammad Rostamian

Hi,

I'm working on TSC, whit Stm32f051. At the end of equasition, I read the counter(TSC->IOGXR). this counter increses smoothly in period of time. After a certain level, it fall down(like the sawtooth wave).

 My code is very simple az shown below:

 

Confige the TSC:

TSC->CR = (0xFUL << 28) | (0xFUL << 24) | (0x6UL << 5);

TSC->IOHCR &= ~( (0xFUL << 4) | (0xFUL << 0));

TSC->IOSCR =( (8UL << 4) | (8UL << 0));

TSC->ICR = 3;

TSC-> IOGCSR |= 3;

TSC->CR |= 0X03;

 

while(1)

{

      While((TSC->ISR & 0X1) == 0X00);

       X  = TSC->IOGXCR[0];

       TSC->ICR |= 0x01;

       TSC-CR |= 0X02;

       for(uint8_t i = 0; i < 2; i++)

       {

              while( !USART_GetFlagStatus(USART1, USART_FLAGTXE);

              USART_SendData(USART1, X >> i);

      }

}

The pictuer of sample is shown below:

 

Why does this happen?

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