pwm_2ch_timer2_interrupt.c File Reference

#include "fw_hal.h"

Go to the source code of this file.

Functions
	INTERRUPT (Timer2_Routine, EXTI_VectTimer2)
void	main (void)

Variables
__BIT	dir = SET
uint8_t	dc = 0

Function Documentation

INTERRUPT()

INTERRUPT	(	Timer2_Routine	,
		EXTI_VectTimer2
	)

Definition at line 28 of file pwm_2ch_timer2_interrupt.c.

{
    PWMA_PWM1_SetCaptureCompareValue(dc);
    UART1_TxHex(dc);
    UART1_TxString("\r\n");
    if (dir)
    {
        dc++;
        if (dc == 0xFF) dir = !dir;
    }
    else
    {
        dc--;
        if (dc == 0) dir = !dir;
    }
}

main()

void main

(

void

)

Definition at line 45 of file pwm_2ch_timer2_interrupt.c.

{
    SYS_SetClock();
    // UART1, baud 115200, baud source Timer1, 1T mode
    UART1_Config8bitUart(UART1_BaudSource_Timer1, HAL_State_ON, 115200);
 
    // Set GPIO pins output mode
    GPIO_P1_SetMode(GPIO_Pin_0|GPIO_Pin_1, GPIO_Mode_Output_PP);
    // Turn off PWMA.1 before change its mode
    PWMA_PWM1_SetPortState(HAL_State_OFF);
    PWMA_PWM1N_SetPortState(HAL_State_OFF);
    // Set PWMA.1 port direction output
    PWMA_PWM1_SetPortDirection(PWMB_PortDirOut);
    // Set PWMA.1 output low voltage when counter is less than target value
    PWMA_PWM1_ConfigOutputMode(PWM_OutputMode_PWM_LowIfLess);
    // Enable comparison value preload to make duty cycle changing smooth
    PWMA_PWM1_SetComparePreload(HAL_State_ON);
    // Turn on PWMA.1
    PWMA_PWM1_SetPortState(HAL_State_ON);
    // Turn on PWMA.1 complementary output
    PWMA_PWM1N_SetPortState(HAL_State_ON);
    // Set highest PWM clock
    PWMA_SetPrescaler(0);
    // PWM width = Period + 1 (side alignment), or AutoReloadPeriod * 2 (center alignment)
    PWMA_SetPeriod(0xFF);
    // Counter direction, down:from [PWMA_ARRH,PWMA_ARRL] to 0
    PWMA_SetCounterDirection(PWM_CounterDirection_Down);
    // Enable preload on reload-period
    PWMA_SetAutoReloadPreload(HAL_State_ON);
    // Enable output on PWMA.1P, PWMA.1N
    PWMA_SetPinOutputState(PWM_Pin_1|PWM_Pin_1N, HAL_State_ON);
    // Set PWMA.1 alternative ports to P1.0 and P1.1
    PWMA_PWM1_SetPort(PWMA_PWM1_AlterPort_P10_P11);
    // Enable overall output
    PWMA_SetOverallState(HAL_State_ON);
    // Start counter
    PWMA_SetCounterState(HAL_State_ON);
 
    // 1T mode, prescaler:255+1, frequency: 100
    TIM_Timer2_Config(HAL_State_ON, 0xFF, 100);
    // Timer2 interrupt: ON
    EXTI_Timer2_SetIntState(HAL_State_ON);
    EXTI_Global_SetIntState(HAL_State_ON);
    TIM_Timer2_SetRunState(HAL_State_ON);
 
    while(1);
}

Variable Documentation

dc

uint8_t dc = 0

Definition at line 26 of file pwm_2ch_timer2_interrupt.c.

dir

__BIT dir = SET

Demo: 2-channel with timer2 interrupt

P1.0 -> 1k Ω resistor -> LED1+ P1.1 -> 1k Ω resistor -> LED2+ GND -> LED1- GND -> LED2-

Definition at line 25 of file pwm_2ch_timer2_interrupt.c.