void tone(uint8_t pin, unsigned int frequency, unsigned long duration)
{
/* Use TIMERA0B since it is not on any pin */
tone_timer = digitalPinToTimer(pin);
if(tone_timer == NOT_ON_TIMER)
return;
if(tone_state != 0 && pin != current_pin)
return;
g_duration = duration;
current_pin = pin;
tone_state = 2;
MAP_PRCMPeripheralClkEnable(PRCM_TIMERA0, PRCM_RUN_MODE_CLK);
MAP_PRCMPeripheralReset(PRCM_TIMERA0);
MAP_TimerConfigure(TIMERA0_BASE, TIMER_CFG_SPLIT_PAIR | TIMER_CFG_B_PERIODIC);
MAP_TimerIntRegister(TIMERA0_BASE, TIMER_B, ToneIntHandler);
MAP_TimerIntEnable(TIMERA0_BASE, TIMER_TIMB_TIMEOUT);
MAP_TimerPrescaleSet(TIMERA0_BASE, TIMER_B, 7);
MAP_TimerLoadSet(TIMERA0_BASE, TIMER_B, (F_CPU / 8) / 1000);
MAP_TimerEnable(TIMERA0_BASE, TIMER_B);
PWMWrite(pin, 256, 128, frequency);
}
void tone(uint8_t pin, unsigned int frequency)
{
tone_timer = digitalPinToTimer(pin);
if(tone_timer == NOT_ON_TIMER)
return;
if(tone_state == 0 || pin == current_pin) {
PWMWrite(pin, 255, 128, frequency);
tone_state = 1;
current_pin = pin;
}
}
void tone(uint8_t _pin, unsigned int frequency)
{
uint8_t port = digitalPinToPort(_pin);
if (port == NOT_A_PORT) return;
if(tone_state == 0 || _pin == current_pin) {
tone_timer = digitalPinToTimer(_pin);
PWMWrite(_pin, 256, 128, frequency);
tone_state = 1;
}
}
void analogWrite(uint8_t pin, int val) {
/* duty cycle(%) = val / 255;
* Frequency of 490Hz specified by Arduino API */
uint8_t timer = digitalPinToTimer(pin);
if(timer == NOT_ON_TIMER)
return;
if (val == 0) {
pinMode(pin, OUTPUT);
digitalWrite(pin, LOW);
return;
}
if (val >= 255) {
pinMode(pin, OUTPUT);
digitalWrite(pin, HIGH);
return;
}
PWMWrite(pin, 255, val, 490);
}
void tone(uint8_t _pin, unsigned int frequency, unsigned long duration)
{
uint8_t port = digitalPinToPort(_pin);
if (port == NOT_A_PORT) return;
if (tone_state == 0 || _pin == current_pin) {
//Setup PWM
current_pin = _pin;
tone_timer = digitalPinToTimer(_pin);
uint32_t timerBase = getTimerBase(timerToOffset(tone_timer));
tone_state = 1;
g_duration = duration;
PWMWrite(_pin, 256, 128, frequency);
//Setup interrupts for duration, interrupting at 1kHz
ROM_SysCtlPeripheralEnable(SYSCTL_PERIPH_TIMER4);
ROM_IntMasterEnable();
ROM_TimerConfigure(TIMER4_BASE, TIMER_CFG_PERIODIC);
ROM_TimerLoadSet(TIMER4_BASE, TIMER_A, ROM_SysCtlClockGet()/1000);
ROM_IntEnable(INT_TIMER4A);
ROM_TimerIntEnable(TIMER4_BASE, TIMER_TIMA_TIMEOUT);
ROM_TimerEnable(TIMER4_BASE, TIMER_A);
}
}
