pwm_2ch_complementary.c File Reference

#include "fw_hal.h"

Go to the source code of this file.

Functions
void	main (void)

Function Documentation

main()

void main

(

void

)

Demo: 2-channel complementary output

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

Definition at line 26 of file pwm_2ch_complementary.c.

{
    __BIT dir = SET;
    uint8_t dc = 0; 
 
    SYS_SetClock();
    // UART1, baud 115200, baud source Timer2, 1T mode
    UART1_Config8bitUart(UART1_BaudSource_Timer2, 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);
 
    while(1)
    {
        PWMA_PWM1_SetCaptureCompareValue(dc);
        UART1_TxHex(0xFF);
        if (dir)
        {
            dc++;
            if (dc == 0xFF) dir = !dir;
        }
        else
        {
            dc--;
            if (dc == 0) dir = !dir;
        }
        UART1_TxString("\r\n");
        SYS_Delay(10);
    }
}