/*FUNCTION**********************************************************************
*
* Function Name : FTM_DRV_SetupChnDualEdgeCapture
* Description : Configures the Dual Edge Capture mode of the FTM
* This function sets up the dual edge capture mode on a channel pair.
* The capture edge for the channel pair and the capture mode (one-shot or continuous)
* is specified in the param argument. The filter function is disabled if the
* filterVal argument passed in is 0. The filter function is available only on
* channels 0 and 2. The user will have to read the channel CnV registers separately
* to get the capture values.
*
*END**************************************************************************/
void FTM_DRV_SetupChnDualEdgeCapture(uint32_t instance, ftm_dual_edge_capture_param_t *param,
uint8_t channel, uint8_t filterVal)
{
assert(instance < FTM_INSTANCE_COUNT);
assert(channel < g_ftmChannelCount[instance]);
FTM_Type *ftmBase = g_ftmBase[instance];
uint32_t chnlPairnum = FTM_HAL_GetChnPairIndex(channel);
/* Stop the counter */
FTM_HAL_SetClockSource(ftmBase, kClock_source_FTM_None);
FTM_HAL_SetCounterInitVal(ftmBase, 0);
FTM_HAL_SetMod(ftmBase, 0xFFFF);
FTM_HAL_SetCpwms(ftmBase, 0);
FTM_HAL_SetDualChnCombineCmd(ftmBase, chnlPairnum, false);
/* Enable the DECAPEN bit */
FTM_HAL_SetDualEdgeCaptureCmd(ftmBase, chnlPairnum, true);
/* Setup the edge detection from channel n and n + 1 */
FTM_HAL_SetChnEdgeLevel(ftmBase, chnlPairnum * 2, param->currChanEdgeMode);
FTM_HAL_SetChnEdgeLevel(ftmBase, (chnlPairnum * 2) + 1, param->nextChanEdgeMode);
FTM_HAL_ClearChnEventFlag(ftmBase, channel);
FTM_HAL_ClearChnEventFlag(ftmBase, channel + 1);
FTM_HAL_SetDualChnDecapCmd(ftmBase, chnlPairnum, true);
FTM_HAL_SetChnMSnBAMode(ftmBase, chnlPairnum * 2, param->mode);
if (channel < CHAN4_IDX)
{
FTM_HAL_SetChnInputCaptureFilter(ftmBase, channel, filterVal);
}
/* Set clock source to start the counter */
FTM_HAL_SetClockSource(ftmBase, s_ftmClockSource);
}
/*!
* @brief FTM interrupt handler.
*/
void BOARD_FTM_IRQ_HANDLER(void)
{
// The overflow interrupt is the start of each cycle and is handled first.
if(FTM_HAL_HasTimerOverflowed(BOARD_FTM_BASE))
{
// Clear the interrupt.
FTM_HAL_ClearTimerOverflow(BOARD_FTM_BASE);
// Update LED state/duty cycle for the X-axis.
FTM_HAL_SetChnCountVal(BOARD_FTM_BASE, BOARD_FTM_X_CHANNEL, g_xValue);
// Only turn on the LED if the new duty cycle is not 0.
if(g_xValue)
{
LED3_ON;
FTM_HAL_EnableChnInt(BOARD_FTM_BASE, BOARD_FTM_X_CHANNEL);
}
else
{
LED3_OFF;
FTM_HAL_DisableChnInt(BOARD_FTM_BASE, BOARD_FTM_X_CHANNEL);
}
// Update LED state/duty cycle for the Y-axis.
FTM_HAL_SetChnCountVal(BOARD_FTM_BASE, BOARD_FTM_Y_CHANNEL, g_yValue);
// Only turn on the LED if the new duty cycle is not 0.
if(g_yValue)
{
LED2_ON;
FTM_HAL_EnableChnInt(BOARD_FTM_BASE, BOARD_FTM_Y_CHANNEL);
}
else
{
LED2_OFF;
FTM_HAL_DisableChnInt(BOARD_FTM_BASE, BOARD_FTM_Y_CHANNEL);
}
// Perform a software sync to update the counter registers.
FTM_HAL_SetSoftwareTriggerCmd(BOARD_FTM_BASE, true);
}
// X-axis match: Clear interrupt and turn LED off.
if(FTM_HAL_HasChnEventOccurred(BOARD_FTM_BASE, BOARD_FTM_X_CHANNEL))
{
FTM_HAL_ClearChnEventFlag(BOARD_FTM_BASE, BOARD_FTM_X_CHANNEL);
LED3_OFF;
}
// Y-axis match: Clear interrupt and turn LED off.
if(FTM_HAL_HasChnEventOccurred(BOARD_FTM_BASE, BOARD_FTM_Y_CHANNEL))
{
FTM_HAL_ClearChnEventFlag(BOARD_FTM_BASE, BOARD_FTM_Y_CHANNEL);
LED2_OFF;
}
}
static void ResetFTM(uint32_t instance) {
FTM_Type *ftmBase = g_ftmBase[instance];
uint8_t channel;
/* reset all values */
FTM_HAL_SetCounter(ftmBase, 0); /* reset FTM counter */
FTM_HAL_ClearTimerOverflow(ftmBase); /* clear timer overflow flag (if any) */
for(channel=0; channel<NOF_FTM_CHANNELS; channel++) {
FTM_HAL_ClearChnEventFlag(ftmBase, channel); /* clear channel flag */
FTM_HAL_SetChnDmaCmd(ftmBase, channel, true); /* enable DMA request */
FTM_HAL_EnableChnInt(ftmBase, channel); /* enable channel interrupt: need to have both DMA and CHnIE set for DMA transfers! See RM 40.4.23 */
}
}
static void StopFTMDMA(uint32_t instance) {
FTM_Type *ftmBase = g_ftmBase[instance];
uint8_t channel;
StartStopFTM(instance, false); /* stop FTM timer */
/* reset all values */
FTM_HAL_SetCounter(ftmBase, 0); /* reset FTM counter */
FTM_HAL_ClearTimerOverflow(ftmBase); /* clear timer overflow flag (if any) */
for(channel=0; channel<NOF_FTM_CHANNELS; channel++) {
FTM_HAL_DisableChnInt(ftmBase, channel); /* disable channel interrupt */
FTM_HAL_SetChnDmaCmd(ftmBase, channel, false); /* disable DMA request */
FTM_HAL_ClearChnEventFlag(ftmBase, channel); /* clear channel flag */
}
}
