/*FUNCTION**********************************************************************
*
* Function Name : TSI_HAL_MeasurementBlocking
* Description : Function do blocking measurement of enabled electrodes
* It used just for recalibration process
*END**************************************************************************/
static int32_t TSI_HAL_MeasurementBlocking(TSI_Type * base, uint32_t electrode, uint32_t noise_mode)
{
int32_t result;
uint32_t timeout = 1000000;
/* measure only if at least one electrode is enabled */
TSI_HAL_EnableSoftwareTriggerScan(base);
TSI_HAL_SetMeasuredChannelNumber(base, electrode);
TSI_HAL_SetMode(base, TSI_HAL_GetMode(base)); /* force to HW right analog mode. */
TSI_HAL_EnableModule(base);
TSI_HAL_StartSoftwareTrigger(base);
while((TSI_HAL_GetEndOfScanFlag(base) == 0U) && (--timeout))
{
/* Do nothing, just to meet MISRA C 2004 rule 14.3 . */
}
if(timeout == 0)
{
result = 0;
}else
{
if(noise_mode)
{
result = TSI_HAL_GetNoiseResult(base);
}else
{
result = TSI_HAL_GetCounter(base);
}
}
TSI_HAL_ClearEndOfScanFlag(base);
TSI_HAL_DisableModule(base);
return result;
}
/*!
* @brief Interrupt handler for TSI.
* This handler uses the tsi State structure to handle the instance depend data.
* This is not a public API as it is called whenever an interrupt occurs.
*/
void TSI_DRV_IRQHandler(uint32_t instance)
{
TSI_Type * base = g_tsiBase[instance];
tsi_state_t * tsiState = g_tsiStatePtr[instance];
uint32_t channels = tsiState->opModesData[tsiState->opMode].enabledElectrodes;
uint32_t curr_channel = TSI_HAL_GetMeasuredChannelNumber(base);
uint32_t next_pen, pen;
/* Check if a measure is running and wanted. */
TSI_HAL_ClearOutOfRangeFlag(base);
TSI_HAL_ClearEndOfScanFlag(base);
if((uint32_t)(1 << curr_channel) & channels)
{
/* Am I in noise mode? */
if(tsiState->opMode == tsi_OpModeNoise)
{
tsiState->counters[curr_channel] = TSI_HAL_GetMode(base);
}
else
{
tsiState->counters[curr_channel] = TSI_HAL_GetCounter(base);
}
}
next_pen = curr_channel + 1;
pen = channels;
while (((((pen >> next_pen) & 0x1U)) == 0U) && (next_pen < 16))
{
next_pen++;
}
if(next_pen < 16)
{
/* Measurement must continue on next channel. */
TSI_HAL_SetMeasuredChannelNumber(base, next_pen);
TSI_HAL_StartSoftwareTrigger(base);
return;
}
if(tsiState->isBlockingMeasure)
{
/* Signal the synchronous completion object. */
OSA_SemaPost(&tsiState->irqSync);
tsiState->isBlockingMeasure = false;
}
else if(tsiState->pCallBackFunc)
{
tsiState->pCallBackFunc(instance, tsiState->usrData);
}
if(tsiState->status != kStatus_TSI_LowPower)
{
/* Return status of the driver to initialized state */
tsiState->status = kStatus_TSI_Initialized;
}
}
/*FUNCTION**********************************************************************
*
* Function Name : TSI_DRV_Measure
* Description : This function gets (measure) capacitance of enabled electrodes
* from the TSI module using a non-blocking method.
*
*END**************************************************************************/
tsi_status_t TSI_DRV_Measure(uint32_t instance)
{
assert(instance < TSI_INSTANCE_COUNT);
TSI_Type * base = g_tsiBase[instance];
tsi_state_t * tsiState = g_tsiStatePtr[instance];
uint32_t first_pen, pen;
/* Critical section. Access to global variable */
if (kStatus_OSA_Success != OSA_MutexLock(&tsiState->lock, OSA_WAIT_FOREVER))
{
return kStatus_TSI_Error;
}
if (tsiState->status != kStatus_TSI_Initialized)
{
/* End of critical section. */
OSA_MutexUnlock(&tsiState->lock);
return tsiState->status;
}
if(!tsiState->opModesData[tsiState->opMode].enabledElectrodes)
{
/* End of critical section. */
OSA_MutexUnlock(&tsiState->lock);
return kStatus_TSI_InvalidChannel;
}
tsiState->status = kStatus_TSI_Busy;
first_pen = 0U;
pen = tsiState->opModesData[tsiState->opMode].enabledElectrodes;
while (((pen >> first_pen) & 0x1U) == 0U) {
first_pen++;
}
/* End of critical section. */
OSA_MutexUnlock(&tsiState->lock);
TSI_HAL_DisableModule(base);
TSI_HAL_SetMeasuredChannelNumber(base, first_pen);
TSI_HAL_EnableSoftwareTriggerScan(base);
TSI_HAL_EnableModule(base);
TSI_HAL_StartSoftwareTrigger(base);
return kStatus_TSI_Success;
}
/*FUNCTION**********************************************************************
*
* Function Name : TSI_DRV_EnableLowPower
* Description : Enables/Disables the low power module.
*
*END**************************************************************************/
tsi_status_t TSI_DRV_EnableLowPower(uint32_t instance)
{
assert(instance < TSI_INSTANCE_COUNT);
TSI_Type * base = g_tsiBase[instance];
tsi_state_t * tsiState = g_tsiStatePtr[instance];
tsi_status_t status;
uint32_t i;
int32_t channel = -1;
/* Critical section. Access to global variable */
if (kStatus_OSA_Success != OSA_MutexLock(&tsiState->lock, OSA_WAIT_FOREVER))
{
return kStatus_TSI_Error;
}
if((tsiState->opModesData[tsiState->opMode].config.thresl == 0) || (tsiState->opModesData[tsiState->opMode].config.thresh == 0))
{
/* End of critical section. */
OSA_MutexUnlock(&tsiState->lock);
return kStatus_TSI_Error;
}
if ((status = TSI_DRV_ChangeMode(instance, tsi_OpModeLowPower)) != kStatus_TSI_Success)
{
/* End of critical section. */
OSA_MutexUnlock(&tsiState->lock);
return status;
}
if(tsiState->opModesData[tsiState->opMode].enabledElectrodes == 0)
{
/* End of critical section. */
OSA_MutexUnlock(&tsiState->lock);
return kStatus_TSI_InvalidChannel;
}
/* Configurate the peripheral for next use */
TSI_HAL_EnableOutOfRangeInterrupt(base);
TSI_HAL_EnableHardwareTriggerScan(base);
for(i = 0; i < FSL_FEATURE_TSI_CHANNEL_COUNT; i++)
{
if((uint32_t)(1 << i) & tsiState->opModesData[tsiState->opMode].enabledElectrodes)
{
channel = i;
break;
}
}
if(channel == -1)
{
/* End of critical section. */
OSA_MutexUnlock(&tsiState->lock);
return kStatus_TSI_InvalidChannel;
}
tsiState->status = kStatus_TSI_LowPower;
TSI_HAL_EnableLowPower(base);
TSI_HAL_SetMeasuredChannelNumber(base, channel);
TSI_HAL_EnableInterrupt(base);
TSI_HAL_EnableModule(base);
/* End of critical section. */
OSA_MutexUnlock(&tsiState->lock);
return kStatus_TSI_Success;
}
