ATTINY1616无法切换PWM输出引脚问题技术求助

我刚入门MCU编程，先从Arduino入手，现在尝试使用ATTINY1616实现LED呼吸调光的PWM效果。原本以为代码可行，但发现仅PB0引脚能正常输出PWM，其他引脚无任何输出。我查阅了ATTINY1614/16/17的datasheet（重点看了TCA的第20章节），确认存在更多可用PWM引脚，但未找到缺失的配置指令。

代码无论选择哪个引脚作为输出都能编译通过，但MCU仅PB0有效，其他引脚无输出，Microchip Studio也未提示任何错误，我甚至更换了新的MCU。我不太擅长阅读datasheet，推测PB0作为TCA0的WO0是默认引脚，需配置指令切换其他引脚，但未找到有效方法。

初始代码 #

#define F_CPU 20000000
#include <avr/io.h>
#include <avr/interrupt.h>
#include <util/delay.h>
#include <stdint.h>

void PWM_init() {
    // Configure Timer/Counter 0 (TC0) for PWM generation

    // Set TC0 waveform generation mode to Fast PWM
    TCA0.SINGLE.CTRLB = TCA_SINGLE_WGMODE_SINGLESLOPE_gc | TCA_SINGLE_CMP0EN_bm;

    // Set TC0 period (TOP value) to 8-bit resolution
    TCA0.SINGLE.PER = 0xFF;

    // Set TC0 PWM output on PB0 (LED pin)  
    PORTB.DIRSET = PIN0_bm;
    //PORTA.DIRSET = PIN4_bm; <------Pin PA4. It won't work even if PB0 is removed

    TCA0.SINGLE.CTRLA = TCA_SINGLE_ENABLE_bm;
}

void PWM_control() {
    // Define the number of steps and the delay between each step
    const uint16_t numSteps = 256;
    const uint16_t delayMs = 10;

    // Fade in
    for (uint16_t step = 0; step < numSteps; step++) {
        // Set ADC value based on the step
        uint16_t adcValue = step;

        // Scale the ADC value to PWM range (0-255)
        uint8_t pwmValue = adcValue >> 2; // Right shift by 2 (divide by 4)

        // Update PWM duty cycle
        TCA0.SINGLE.CMP0 = pwmValue;

        // Delay between each step
        _delay_ms(delayMs);
    }
    // Fade out
    for (uint16_t step = 256; step > 0; step--) {
        // Set ADC value based on the step
        uint16_t adcValue = step;

        // Scale the ADC value to PWM range (0-255)
        uint8_t pwmValue = adcValue >> 2; // Right shift by 2 (divide by 4)

        // Update PWM duty cycle
        TCA0.SINGLE.CMP0 = pwmValue;

        // Delay between each step
        _delay_ms(delayMs);
    }
}

int main() {
    // Initialize PWM
    PWM_init();
    CPU_CCP = 0xD8; //enable write to protected register;
    CLKCTRL_MCLKCTRLB = 0; // No prescaling to periphery, therefore 20MHz frequency;

    while (1) {
        // Control PWM
        PWM_control();

        _delay_ms(10);
    }

    return 0;
}

已尝试的方法 #

• 在该MCU上运行Arduino版本代码，可正常工作；
• 仅修改PORTx.DIRSET切换引脚，仅PB0有效；
• 为其他引脚编写独立初始化函数，无效；
• 修改TCA_SINGLE_CMP0EN_bm、TCA_SINGLE_WGMODE_SINGLESLOPE_gc等指令，切换为TCB定时器，均无效。

后续修改的PWM初始化代码 #

TCA0.SPLIT.CTRLA = TCA_SINGLE_ENABLE_bp;
//SPLIT MODE INIT
TCA0.SPLIT.CTRLD = TCA_SINGLE_SPLITM_bm;
TCA0.SPLIT.HPER = 0xFF;
TCA0.SPLIT.CTRLA = TCA_SINGLE_ENABLE_bm;
TCA0.SPLIT.CTRLB = TCA_SPLIT_HCMP0EN_bm | TCA_SPLIT_HCMP1EN_bm | TCA_SPLIT_HCMP2EN_bm;

控制部分仅将TCA0.SINGLE.CMP0改为TCA0.SPLIT.HCMP1以适配PA4引脚。

内容的提问来源于stack exchange，提问作者Collapsedblock6