Hello to everyone! I am an electronic engineer but iam new on stm32.
At the moment iam talking only for one phase. i have a square wave of 50Hz => 20ms of period with dutycycle 50% that is implemented in INPUT CAPTURE CH2(PE11) and i have choose the OUTPUT COMPARE CH1(PE9). Firstable i want to use only a positive edges triggered to generate my first pulse and not the zero crossing. this is a code that i implemented watching tutorials on internet but it is zero crossing .
#define SCR_PULSE_WIDTH 500 // Duration of SCR trigger pulse in µs
static void MX_TIM1_Init(void)
{
{
__HAL_RCC_TIM1_CLK_ENABLE(); // Enable Timer 1 clock
TIM1->CR1 = 0x0089; // Auto-reload, One-Pulse-Mode
TIM1->CR2 = 0x0000; // Idle-state configuration
TIM1->SMCR = 0x0066; // Trigger-Mode, Timer input 2
TIM1->DIER = 0x0000; // Disable interrupts
TIM1->SR = 0x0000; // Clear status register
TIM1->EGR = 0x0000; // Clear event generation register
TIM1->CCMR1 = 0x0178; // OC1: PWM2-Mode, Preload, IC2: IC2 on TI2
TIM1->CCMR2 = 0x0000; // OC3/OC4, IC3/IC4 off
TIM1->CCER = 0x00A1; // OC1: On, AH; IC2: On, Both edges
TIM1->CNT = 0; // Clear timer 1 counter
TIM1->PSC = 168-1; // Set prescaler to 168
TIM1->ARR = 0x0000; // Initialize Auto-reload register
TIM1->RCR = 0x0000; // Clear repetition counter
TIM1->CCR1 = 0x0000; // Initialize Capture/Compare register 1
TIM1->CCR2 = 0x0000; // Clear Capture/Compare register 2
TIM1->CCR3 = 0x0000; // Clear Capture/Compare register 3
TIM1->CCR4 = 0x0000; // Clear Capture/Compare register 4
TIM1->BDTR = 0x8000; // Main output enable
TIM1->DCR = 0x0000; // Clear DMA configuration (DMA not needed)
// TIM1->DMAR = ......; // NOT WRITE TO THIS REGISTER
TIM1->CR1 |= 0x0001; // Timer 1 Enable
}
int main(void)
{
float x=2.3;
HAL_Init(); // Initialize STM32 HAL
SystemClock_Config(); // Configure core clock
MX_TIM1_Init(); // Initialize Timer 1 (OC1 / IC2)
MX_GPIO_Init(); // Initialize GPIOs
MX_ADC1_Init();
while ( 1 )
{
int alpha,y=10;
HAL_ADC_Start(&hadc1);
HAL_ADC_PollForConversion(&hadc1,1);
alpha=HAL_ADC_GetValue(&hadc1);
alpha=(alpha+y);
TIM1->CCR1 = (alpha*x);
TIM1->ARR = ((alpha*x) + SCR_PULSE_WIDTH );
HAL_Delay(1);
}
in this case the result consists in the pulse at 10ms of period ,but i want the pulse only on positive edge triggered so i want the pulse only in 20 ms.Can anybody help me in this? what can i change?
