/*
This example shows how to configure TCC0 for basic timer operation.
The timer will run at the main clock frequency (32MHz) so we need
to do a bit of math to derive the number of clock cycles to arrive
at the desired microsecond time out.
*/
void startTimer(uint16_t microseconds)
{
uint32_t cycles;
// There are 31.25 nano seconds per clock cycle.
// So we multiply the micro seconds by the clock period to determine
// the number of clock cycles to achieve the microsecond timeout.
// That number of cycles becomes our TOP value.
// We will use 32 nano seconds to preclude floating point arithmetic.
cycles = 32*microseconds;
// Set period/TOP value.
TCC0.CCA = cycles;
// Set the CNT to 0.
TC_SetCount(&TCC0, 0);
/* Enable Input "Capture or Compare" channel A. */
TC0_EnableCCChannels( &TCC0, TC0_CCAEN_bm );
// Select clock source and start the timer.
TC0_ConfigClockSource( &TCC0, TC_CLKSEL_DIV1_gc );
// Enable CCA interrupt.
TC0_SetCCAIntLevel( &TCC0, TC_CCAINTLVL_LO_gc );
PMIC.CTRL |= PMIC_LOLVLEN_bm;
}
// Configures PWM output on compare a b and c for single slope pwm, with hires, and clk source as sys clk
void configPWM (volatile TC0_t * tc, HIRES_t * hires, uint16_t period) {
TC_SetPeriod (tc, period );
TC0_ConfigWGM (tc, TC_WGMODE_NORMAL_gc ); // set to single slope pwm generation mode
TC0_EnableCCChannels (tc, TC0_CCAEN_bm); // enable compare A
TC0_EnableCCChannels (tc, TC0_CCBEN_bm); // enable compare B
TC0_EnableCCChannels (tc, TC0_CCCEN_bm); // enable compare C
TC0_EnableCCChannels (tc, TC0_CCDEN_bm); // enable compare D
//~ TC0_SetCCAIntLevel (tc, TC_CCAINTLVL_HI_gc);
TC0_SetCCBIntLevel (tc, TC_CCBINTLVL_LO_gc);
//~ TC0_SetCCCIntLevel (tc, TC_CCCINTLVL_HI_gc);
//~ TC0_SetCCDIntLevel (tc, TC_CCDINTLVL_HI_gc);
TC0_SetOverflowIntLevel (tc, TC_OVFINTLVL_LO_gc);
PMIC.CTRL |= PMIC_HILVLEN_bm;
TC0_ConfigClockSource (tc, TC_CLKSEL_DIV1_gc);
HIRES_Enable (hires, HIRES_HREN_TC0_gc);
}
// This function initializes the PWMs
void Init_PWM( void )
{
// Set PWM outputs
MOTOR_OUTPUT.DIRSET = 0x03; // PD0/PD1 set as outputs
// Configure timer
TC0_ConfigWGM(&MOTOR_TIMER, TC_WGMODE_SS_gc);
TC0_EnableCCChannels(&MOTOR_TIMER, TC0_CCAEN_bm|TC0_CCBEN_bm);
TC_SetCompareA(&MOTOR_TIMER, 0);
TC_SetCompareB(&MOTOR_TIMER, 0);
TC_SetPeriod(&MOTOR_TIMER, MAX_PWM);
TC0_ConfigClockSource(&MOTOR_TIMER, TC_CLKSEL_DIV1_gc); // 32MHz
}
void battery_init()
{
PORTD.DIRSET = PIN4_bm | PIN5_bm | PIN6_bm; // battery level indicator
PORTD.OUT = 0x00;
PORTC.DIRSET = PIN7_bm; // signal to stop the boost converters
PORTC.OUTSET = PIN7_bm; // start with the converters stopped to avoid power
// surges on the battery. When the voltage recovers
// the converters will be enabled again
PORTC.DIRCLR = PIN6_bm; // input V_USB_CHG
PORTE.DIRCLR = PIN3_bm; // input CHG_STAT
// update once for each second (1Hz)
TC_SetPeriod(&TCE0, 31250);
TC0_ConfigClockSource(&TCE0, TC_CLKSEL_DIV256_gc);
TC0_ConfigWGM(&TCE0, TC_WGMODE_NORMAL_gc);
TC0_EnableCCChannels(&TCE0, TC0_CCAEN_bm);
TC0_SetCCAIntLevel(&TCE0, TC_CCAINTLVL_LO_gc);
}
void TCE0_init()
{
/* Select a Waveform Genreation mode and the CC channels to use*/
TC0_ConfigWGM( &TCE0, TC_WGMODE_SS_gc );
TC0_EnableCCChannels( &TCE0, TC0_CCAEN_bm); // only CCA is used
TC_SetPeriod( &TCE0, 60000);
/* The corresponding port pins MUST be output for the Waveform to be visible */
PORTE.DIRSET = 0xFF;
PORTE.OUTSET = 0xFF; //set port high to switch LEDs off, take INVEN into account
/* To have inverted ouput on some pins we set the corresponding INVEN bit for the pin*/
TC0_ConfigClockSource(&TCE0, TC_CLKSEL_DIV1_gc);
}
