Генератор прямоугольных имульсов до 84МГц

Ivan_Kornege · #1

Гуру помогите сделать блок для FLProg из этого кода.
Реально выдает 84МГц на DUE.

СпойлерПоказать

uint32_t pwmPin = 8;
uint32_t maxDutyCount = 2;
uint32_t clkAFreq = 42000000ul;
uint32_t pwmFreq = 42000000ul; 
void setup() {
  pmc_enable_periph_clk(PWM_INTERFACE_ID);
  PWMC_ConfigureClocks(clkAFreq, 0, VARIANT_MCK);
  PIO_Configure(
    g_APinDescription[pwmPin].pPort,
    g_APinDescription[pwmPin].ulPinType,
    g_APinDescription[pwmPin].ulPin,
    g_APinDescription[pwmPin].ulPinConfiguration);
  uint32_t channel = g_APinDescription[pwmPin].ulPWMChannel;
  PWMC_ConfigureChannel(PWM_INTERFACE, channel , pwmFreq, 0, 0);
  PWMC_SetPeriod(PWM_INTERFACE, channel, maxDutyCount);
  PWMC_EnableChannel(PWM_INTERFACE, channel);
  PWMC_SetDutyCycle(PWM_INTERFACE, channel, 1);
  pmc_mck_set_prescaler(2);
}
void loop() 
{
}

seri0shka · #2

84МГц___DUE_(CODE).ubi: (5.92 КБ) 102 скачивания

Ivan_Kornege · #3

seri0shka, спасибо за блок.
А можно блок сделать регулируемым- в процессе работы генератора изменять частоту и скважность?

Mining · #4

Вот здесь обсуждали синтезатор на дуе
Наверное с этого скейтча можно сделать блок с регулировкой частоты и скважности.

Код: Выделить всё

uint32_t totalTime = 0; // total elapsed time

uint32_t pwmPin = 8; // PWM output pin
uint32_t irqPin = 5; // interrupt test pin
uint32_t channel = g_APinDescription[pwmPin].ulPWMChannel; // set channel for PWM out
uint32_t sampFreq = 192000ul; // sampling frequency (Hz)
uint16_t maxDutyCount = 255;
uint32_t clkAFreq = 42000000ul; // clock frequency (Hz)
uint32_t pwmFreq = (clkAFreq * 2)/sampFreq; // calculate PWM frequency
uint16_t dutyPercent = 128; // starting duty percent
uint16_t dutyAct = pwmFreq * (maxDutyCount-dutyPercent) / maxDutyCount; // 

void setup() {
  // put your setup code here, to run once:
  pinMode(irqPin, OUTPUT);

  pmc_enable_periph_clk(PWM_INTERFACE_ID);
  PWMC_ConfigureClocks(clkAFreq, 0, VARIANT_MCK);

  PIO_Configure(
   g_APinDescription[pwmPin].pPort,
   g_APinDescription[pwmPin].ulPinType,
   g_APinDescription[pwmPin].ulPin,
   g_APinDescription[pwmPin].ulPinConfiguration);

   channel = g_APinDescription[pwmPin].ulPWMChannel; // channel 5
   PWMC_ConfigureChannel(PWM_INTERFACE, channel, clkAFreq, 0, 0);
   PWMC_SetPeriod(PWM_INTERFACE, channel, pwmFreq);
   PWMC_EnableChannel(PWM_INTERFACE, channel);
   PWMC_SetDutyCycle(PWM_INTERFACE, channel, dutyAct);
   PWM_INTERFACE->PWM_IER1 = 0x20; //enable interrupt on channel 5
   PWM_INTERFACE->PWM_IDR1 = 0xFFFFFFDF; //enable interrupt on channel 5
   PWM_INTERFACE->PWM_IER2 = 0x00002001; //enable interrupt on channel 5
   PWM_INTERFACE->PWM_IDR2 = 0xFFFFDFFE; //enable interrupt on channel 5

   NVIC_DisableIRQ(PWM_IRQn); // set up interrupt
   NVIC_ClearPendingIRQ(PWM_IRQn);
   NVIC_SetPriority(PWM_IRQn, 0);
   NVIC_EnableIRQ((IRQn_Type)36); //NVIC_EnableIRQ(PWM_IRQn);
   PWMC_EnableChannel(PWM_INTERFACE, channel);
   //Enable of the Interrupts (writing CHIDx and FCHIDx
   //in PWM_IER1 register, and writing WRDYE, ENDTXE,
   //TXBUFE, UNRE, CMPMx and CMPUx in PWM_IER2 register)
}

void loop() {
}


void PWM_Handler(void) // PWM interrupt handler
{
   volatile long dummy = PWM_INTERFACE->PWM_ISR1; // clear interrupt flag
   dummy = PWM_INTERFACE->PWM_ISR2; // clear interrupt flag
//your code here!
}