Hardware » Takki

h1. Example code

<pre><code class="cpp">

void TSC_GPIO_Init(void)

{

   __HAL_RCC_GPIOA_CLK_ENABLE();

   GPIO_InitTypeDef GPIO_InitStruct = {0};

   GPIO_InitStruct.Pin = GPIO_PIN_0 | GPIO_PIN_1;

   GPIO_InitStruct.Mode = GPIO_MODE_AF_OD; // Open Drain

   GPIO_InitStruct.Pull = GPIO_NOPULL; // No pull

   GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;

   GPIO_InitStruct.Alternate = GPIO_AF3_TSC; // AF3 = TSC

   HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);

}

TSC_HandleTypeDef htsc;

void MX_TSC_Init(void) 

{ 

   htsc.Instance = TSC;

   htsc.Init.CTPulseHighLength = TSC_CTPH_2CYCLES;

   htsc.Init.CTPulseLowLength = TSC_CTPL_2CYCLES;

   htsc.Init.SpreadSpectrum = DISABLE;

   htsc.Init.SpreadSpectrumDeviation = 0;

   htsc.Init.SpreadSpectrumPrescaler = TSC_SS_PRESC_DIV1;

   htsc.Init.PulseGeneratorPrescaler = TSC_PG_PRESC_DIV4;

   htsc.Init.MaxCountValue = TSC_MCV_16383;

   htsc.Init.IODefaultMode = TSC_IODEF_OUT_PP_LOW;

   htsc.Init.SynchroPinPolarity = TSC_SYNC_POLARITY_FALLING;

   htsc.Init.AcquisitionMode = TSC_ACQ_MODE_NORMAL;

   htsc.Init.MaxCountInterrupt = DISABLE;

   if (HAL_TSC_Init(&htsc) != HAL_OK) 

   { 

      Error_Handler(); 

   } 

   // IOs konfigurieren

   TSC_IOConfigTypeDef IoConfig;

   IoConfig.ChannelIOs = TSC_GROUP1_IO1; // PA0

   IoConfig.SamplingIOs = TSC_GROUP1_IO2; // PA1

   IoConfig.ShieldIOs = 0;

   HAL_TSC_IOConfig(&htsc, &IoConfig);

}

uint16_t TSC_Read(void)

{ 

   // Start acquisition

   HAL_TSC_Start(&htsc);

   // Warten bis fertig

   HAL_TSC_PollForAcquisition(&htsc);

   // Ergebnis holen (Gruppe 1)

   uint16_t value = HAL_TSC_GroupGetValue(&htsc, TSC_GROUP1_IDX);

   // TSC wieder freigeben

   HAL_TSC_Stop(&htsc); 

   return value; 

}

int main(void)

{

   HAL_Init(); 

   SystemClock_Config();

   MX_GPIO_Init();

   MX_TSC_Init();

   while (1)

   {

      uint16_t val = TSC_Read();

      if (val < 3000)

      {

         // Taste berührt

      } 

      else

      {

         // Taste nicht berührt

      }

      HAL_Delay(10);

   }

} 

</code></pre>

nicht berührt:	4000–8000

berührt:   	500–3000