// StartUp TMR/OC module of MCU
void PWM_StartUp(void) {
// Enable OC 1
PLIB_OC_Enable(APP_PWM_OC1_ID);
#ifdef APP_PWM_OC2_ID
// Enable OC 2
PLIB_OC_Enable(APP_PWM_OC2_ID);
#endif // ifdef APP_PWM_OC2_ID
#ifdef APP_PWM_OC3_ID
// Enable OC 3
PLIB_OC_Enable(APP_PWM_OC3_ID);
#endif // ifdef APP_PWM_OC3_ID
#ifdef APP_PWM_OC4_ID
// Enable OC 4
PLIB_OC_Enable(APP_PWM_OC4_ID);
#endif // ifdef APP_PWM_OC4_ID
// Start the PWM timer
PLIB_TMR_Start(APP_PWM_TMR_ID);
#ifdef APP_PWM2_OC1_ID
// Enable PWM2 OC 1
PLIB_OC_Enable(APP_PWM2_OC1_ID);
#ifdef APP_PWM2_OC2_ID
// Enable PWM2 OC 2
PLIB_OC_Enable(APP_PWM2_OC2_ID);
#endif // ifdef APP_PWM2_OC2_ID
// Start the PWM2 timer
PLIB_TMR_Start(APP_PWM2_TMR_ID);
#endif // ifdef APP_PWM2_OC1_ID
}
int main(void)
{
/* Disable JTAG to free up PORTA pins */
DDPCONbits.JTAGEN = 0;
/* Set the lower 8 bits of PORTA as output (for Explorer-16 LEDs),
clear the bits to ensure there is no mismatch when they are toggled */
PLIB_PORTS_DirectionOutputSet(PORTS_ID_0, PORT_CHANNEL_A, (PORTS_DATA_MASK)0x00FF);
PLIB_PORTS_Clear(PORTS_ID_0, PORT_CHANNEL_A, (PORTS_DATA_MASK)0x00FF);
/* Enable the DMA module */
PLIB_DMA_Enable(DMA_ID_0);
/* Channel is continuously enabled */
PLIB_DMA_ChannelXAutoEnable(DMA_ID_0, DMA_CHANNEL_0);
/* Set the source and destinaton addresses (addresses are converted from virtual to physical) */
PLIB_DMA_ChannelXSourceStartAddressSet(DMA_ID_0, DMA_CHANNEL_0, (uint32_t)LED_pattern);
PLIB_DMA_ChannelXDestinationStartAddressSet(DMA_ID_0, DMA_CHANNEL_0, (uint32_t)&LATA);
/* Set the source and destination sizes */
PLIB_DMA_ChannelXSourceSizeSet(DMA_ID_0, DMA_CHANNEL_0, sizeof(LED_pattern));
PLIB_DMA_ChannelXDestinationSizeSet(DMA_ID_0, DMA_CHANNEL_0, 1);
/* Set the number of bytes per transfer */
PLIB_DMA_ChannelXCellSizeSet(DMA_ID_0, DMA_CHANNEL_0, 1);
/* DMA transfer to start on Timer 1 interrupt */
PLIB_DMA_ChannelXTriggerEnable(DMA_ID_0, DMA_CHANNEL_0, DMA_CHANNEL_TRIGGER_TRANSFER_START);
PLIB_DMA_ChannelXStartIRQSet(DMA_ID_0, DMA_CHANNEL_0, DMA_TRIGGER_TIMER_1);
/* Setup Timer 1 to trigger an interrupt 10 times a second */
PLIB_TMR_ClockSourceSelect(TMR_ID_1, TMR_CLOCK_SOURCE_PERIPHERAL_CLOCK);
PLIB_TMR_PrescaleSelect(TMR_ID_1, TMR_PRESCALE_VALUE_256);
PLIB_TMR_Counter16BitClear(TMR_ID_1);
PLIB_TMR_Period16BitSet(TMR_ID_1, 3906);
/* Enable the Timer 1 interrupt source, set its priority level to 2, set
its subpriority level to 0 */
PLIB_INT_SourceEnable(INT_ID_0, INT_SOURCE_TIMER_1);
PLIB_INT_VectorPrioritySet(INT_ID_0, INT_VECTOR_T1, INT_PRIORITY_LEVEL2);
PLIB_INT_VectorSubPrioritySet(INT_ID_0, INT_VECTOR_T1, INT_SUBPRIORITY_LEVEL0);
/* Enable multi-vectored interrupts, enable the generation of interrupts to the CPU */
PLIB_INT_MultiVectorSelect(INT_ID_0);
PLIB_INT_Enable(INT_ID_0);
/* Enable DMA channel 0 */
PLIB_DMA_ChannelXEnable(DMA_ID_0, DMA_CHANNEL_0);
/* Start Timer 1 */
PLIB_TMR_Start(TMR_ID_1);
/* Stuck in this loop, waiting for interrupts to occur */
while (1);
/* Program should not go here during normal operation */
return EXIT_FAILURE;
}
int main(void)
{
/* PBclk as the timer source, prescaler is 256 (PBclk / 256), enable timer 23
(timer 2 + timer 3, 32 bit time), clear the counter, set timer period */
PLIB_TMR_ClockSourceSelect(TMR_ID_2, TMR_CLOCK_SOURCE_PERIPHERAL_CLOCK);
PLIB_TMR_PrescaleSelect(TMR_ID_2, TMR_PRESCALE_VALUE_256);
PLIB_TMR_Mode32BitEnable(TMR_ID_2);
PLIB_TMR_Counter32BitClear(TMR_ID_2);
PLIB_TMR_Period32BitSet(TMR_ID_2, PERIOD);
/* Setup input capture to capture only rising edges, captures start
on first rising edge, use timer 2, use a 32 bit buffer for storing
the captured timer value, enable the input capture 1 module */
PLIB_IC_ModeSelect(IC_ID_1, IC_INPUT_CAPTURE_RISING_EDGE_MODE);
PLIB_IC_FirstCaptureEdgeSelect(IC_ID_1, IC_EDGE_RISING);
PLIB_IC_TimerSelect(IC_ID_1, IC_TIMER_TMR2);
PLIB_IC_BufferSizeSelect(IC_ID_1, IC_BUFFER_SIZE_32BIT);
PLIB_IC_Enable(IC_ID_1);
/* Enable the input capture 1 interrupt source, set its priority level to 2,
set its subpriority level to 0 */
PLIB_INT_SourceEnable(INT_ID_0, INT_SOURCE_INPUT_CAPTURE_1);
PLIB_INT_VectorPrioritySet(INT_ID_0, INT_VECTOR_IC1, INT_PRIORITY_LEVEL2);
PLIB_INT_VectorSubPrioritySet(INT_ID_0, INT_VECTOR_IC1, INT_SUBPRIORITY_LEVEL0);
/* Enable multi-vectored interrupts, enable the generation of interrupts to the CPU */
PLIB_INT_MultiVectorSelect(INT_ID_0);
PLIB_INT_Enable(INT_ID_0);
/* Start the timer */
PLIB_TMR_Start(TMR_ID_2);
/* Waiting for input capture event (stuck in this loop) */
while (1);
/* Program should not go here during normal operation */
return EXIT_FAILURE;
}
void PWM2_SetValues(
TMR_PRESCALE pwmPreScale
, int pwmCycle
, int pwmStart1
, int pwmStop1
, int pwmStart2
, int pwmStop2
) {
if ((pwmPreScale == TMR_PRESCALE_VALUE_1) & (pwmCycle < 400)) {
PWM2_doInt = false;
}
if ((pwmPreScale != PWM2_PreScale) | !PWM2_doInt) {
// total update
// Disable Interrupt / Clear Flag
PLIB_INT_SourceDisable(APP_INT_ID, APP_PWM2_TMR_INT_SOURCE);
PLIB_INT_SourceFlagClear(APP_INT_ID, APP_PWM2_TMR_INT_SOURCE);
// Stop the timer
PLIB_TMR_Stop(APP_PWM2_TMR_ID);
// Disable OC's
PLIB_OC_Disable(APP_PWM2_OC1_ID);
#ifdef APP_PWM2_OC2_ID
PLIB_OC_Disable(APP_PWM2_OC2_ID);
#endif // ifdef APP_PWM2_OC2_ID
PWM2_PreScale = pwmPreScale;
PWM2_Cycle = pwmCycle;
PWM2_Start1 = pwmStart1;
PWM2_Stop1 = pwmStop1;
PWM2_Start2 = pwmStart2;
PWM2_Stop2 = pwmStop2;
// Set the prescaler, and set the clock source as internal
PLIB_TMR_PrescaleSelect(APP_PWM2_TMR_ID, pwmPreScale);
// Clear the timer
PLIB_TMR_Counter16BitClear(APP_PWM2_TMR_ID);
// Load the period register
PLIB_TMR_Period16BitSet(APP_PWM2_TMR_ID, pwmCycle);
// OC1 Init
// Set buffer(primary compare) value
PLIB_OC_Buffer16BitSet(APP_PWM2_OC1_ID, pwmStart1);
// Set pulse width(secondary compare) value
PLIB_OC_PulseWidth16BitSet(APP_PWM2_OC1_ID, pwmStop1);
#ifdef APP_PWM2_OC2_ID
// OC2 Init
// Set buffer(primary compare) value
PLIB_OC_Buffer16BitSet(APP_PWM2_OC2_ID, pwmStart2);
// Set pulse width(secondary compare) value
PLIB_OC_PulseWidth16BitSet(APP_PWM2_OC2_ID, pwmStop2);
#endif // ifdef APP_PWM2_OC2_ID
// Enable OC 1
PLIB_OC_Enable(APP_PWM2_OC1_ID);
#ifdef APP_PWM2_OC2_ID
// Enable OC 2
PLIB_OC_Enable(APP_PWM2_OC2_ID);
#endif // ifdef APP_PWM2_OC2_ID
if ((PWM2_PreScale == TMR_PRESCALE_VALUE_1) & (PWM2_Cycle < 400)) {
PWM2_doInt = false;
} else {
PWM2_doInt = true;
// Reenable Interrupt
PLIB_INT_SourceEnable(APP_INT_ID, APP_PWM2_TMR_INT_SOURCE);
}
// Start the timer
PLIB_TMR_Start(APP_PWM2_TMR_ID);
} else {
// continuos update
PWM2_Cycle = pwmCycle;
PWM2_Start1 = pwmStart1;
PWM2_Stop1 = pwmStop1;
PWM2_Start2 = pwmStart2;
PWM2_Stop2 = pwmStop2;
}
}
inline void DRV_TMR0_Start(void)
{
/* Start Timer*/
PLIB_TMR_Start(TMR_ID_1);
}
void APP_Tasks ( void )
{
/* Check the application's current state. */
switch ( appData.state )
{
/* Application's initial state. */
case APP_STATE_INIT:
{
tmrInterruptHandle = DRV_TMR_Open(DRV_TMR_INDEX_0, DRV_IO_INTENT_EXCLUSIVE);
if (DRV_HANDLE_INVALID == tmrInterruptHandle)
{
// Unable to open the driver
while(1);
}
// based on 80MHz Tpb and 256 PS should be 8192Hz frequency
DRV_TMR_AlarmRegister(tmrInterruptHandle, 38, true, 0, TimerInterruptCallback);
// change state
appData.state = APP_STATE_SETUP_OC;
break;
}
case APP_STATE_SETUP_OC:
{
DRV_OC0_Enable();
DRV_OC0_Start();
// setup the Timer for OC1 module
PLIB_TMR_PrescaleSelect(TMR_ID_2, TMR_PRESCALE_VALUE_1);
PLIB_TMR_Period16BitSet(TMR_ID_2, 9765);
// start Timer
DRV_TMR_Start(tmrInterruptHandle);
PLIB_TMR_Start(TMR_ID_2);
// change state
appData.state = APP_STATE_IDLE;
break;
}
case APP_STATE_IDLE:
{
break;
}
/* TODO: implement your application state machine.*/
/* The default state should never be executed. */
default:
{
/* TODO: Handle error in application's state machine. */
break;
}
}
}
