/**
* @brief Start acquisition and wait until completion.
* @note There is no need of a timeout parameter as the max count error is already
* managed by the TSC peripheral.
* @param htsc: pointer to a TSC_HandleTypeDef structure that contains
* the configuration information for the specified TSC.
* @retval HAL state
*/
HAL_StatusTypeDef HAL_TSC_PollForAcquisition(TSC_HandleTypeDef* htsc)
{
/* Check the parameters */
assert_param(IS_TSC_ALL_INSTANCE(htsc->Instance));
/* Process locked */
__HAL_LOCK(htsc);
/* Check end of acquisition */
while (HAL_TSC_GetState(htsc) == HAL_TSC_STATE_BUSY)
{
/* The timeout (max count error) is managed by the TSC peripheral itself. */
}
/* Process unlocked */
__HAL_UNLOCK(htsc);
return HAL_OK;
}
/**
* @brief Main program.
* @param None
* @retval None
*/
int main(void)
{
/* STM32F3xx HAL library initialization:
- Configure the Flash prefetch
- Systick timer is configured by default as source of time base, but user
can eventually implement his proper time base source (a general purpose
timer for example or other time source), keeping in mind that Time base
duration should be kept 1ms since PPP_TIMEOUT_VALUEs are defined and
handled in milliseconds basis.
- Set NVIC Group Priority to 4
- Low Level Initialization
*/
HAL_Init();
/* Configure the system clock to 72 MHz */
SystemClock_Config();
/* Configure LEDs */
BSP_LED_Init(LED1); /* Touch activity */
BSP_LED_Init(LED2); /* Touch activity */
BSP_LED_Init(LED3); /* Touch activity */
BSP_LED_Init(LED4); /* Error */
/*##-1- Configure the TSC peripheral #######################################*/
TscHandle.Instance = TSCx;
TscHandle.Init.AcquisitionMode = TSC_ACQ_MODE_NORMAL;
TscHandle.Init.CTPulseHighLength = TSC_CTPH_1CYCLE;
TscHandle.Init.CTPulseLowLength = TSC_CTPL_1CYCLE;
TscHandle.Init.IODefaultMode = TSC_IODEF_OUT_PP_LOW;
TscHandle.Init.MaxCountInterrupt = DISABLE;
TscHandle.Init.MaxCountValue = TSC_MCV_16383;
TscHandle.Init.PulseGeneratorPrescaler = TSC_PG_PRESC_DIV64;
TscHandle.Init.SpreadSpectrum = DISABLE;
TscHandle.Init.SpreadSpectrumDeviation = 127;
TscHandle.Init.SpreadSpectrumPrescaler = TSC_SS_PRESC_DIV1;
TscHandle.Init.SynchroPinPolarity = TSC_SYNC_POLARITY_FALLING;
TscHandle.Init.ChannelIOs = TSC_GROUP8_IO2; /* TS1 touchkey */
TscHandle.Init.SamplingIOs = (TSC_GROUP8_IO1 | TSC_GROUP6_IO1);
TscHandle.Init.ShieldIOs = TSC_GROUP6_IO2;
if (HAL_TSC_Init(&TscHandle) != HAL_OK)
{
/* Initialization Error */
Error_Handler();
}
/* Infinite loop */
while (1)
{
/*##-2- Discharge the touch-sensing IOs ##################################*/
/* Must be done before each acquisition */
HAL_TSC_IODischarge(&TscHandle, ENABLE);
HAL_Delay(1); /* 1 ms is more than enough to discharge all capacitors */
/*##-3- Start the acquisition process ####################################*/
if (HAL_TSC_Start(&TscHandle) != HAL_OK)
{
/* Acquisition Error */
Error_Handler();
}
/*##-4- Wait for the end of acquisition ##################################*/
/* Before starting a new acquisition, you need to check the current state of
the peripheral; if it’s busy you need to wait for the end of current
acquisition before starting a new one. */
while (HAL_TSC_GetState(&TscHandle) == HAL_TSC_STATE_BUSY)
{
/* For simplicity reasons, this example is just waiting till the end of the
acquisition, but application may perform other tasks while acquisition
operation is ongoing. */
}
/*##-5- Clear flags ######################################################*/
__HAL_TSC_CLEAR_FLAG(&TscHandle, (TSC_FLAG_EOA | TSC_FLAG_MCE));
/*##-6- Check if the acquisition is correct (no max count) ###############*/
if (HAL_TSC_GroupGetStatus(&TscHandle, TSC_GROUP8_IDX) == TSC_GROUP_COMPLETED)
{
/*##-7- Store the acquisition value ####################################*/
uhTSCAcquisitionValue = HAL_TSC_GroupGetValue(&TscHandle, TSC_GROUP8_IDX);
/* Show touch activity on LEDs */
/* Threshold values are indicative and may need to be adjusted */
if ((uhTSCAcquisitionValue > TSCx_MIN_THRESHOLD) && (uhTSCAcquisitionValue < TSCx_LOW_MAXTHRESHOLD))
{
BSP_LED_On(LED1);
if (uhTSCAcquisitionValue < TSCx_MEDIUM_MAXTHRESHOLD)
{
BSP_LED_On(LED2);
if (uhTSCAcquisitionValue < TSCx_HIGH_MAXTHRESHOLD)
{
BSP_LED_On(LED3);
}
else
{
BSP_LED_Off(LED3);
}
}
else
{
BSP_LED_Off(LED2);
BSP_LED_Off(LED3);
}
}
else
{
BSP_LED_Off(LED1);
BSP_LED_Off(LED2);
BSP_LED_Off(LED3);
}
}
}
}