萤火工场推出的 GD32VW553-IOT 开发板，基于兆易创新（GigaDevice）高性能的 GD32VW553 双模无线微控制器。该芯片搭载 RISC-V 内核，集成了 Wi-Fi (802.11b/g/n) 和 BLE (Bluetooth Low Energy) 5.2 无线连接功能，为物联网设备开发提供了强大的核心平台。开发板设计紧凑，布局合理，提供了包括 GPIO、I2C、SPI、UART、ADC 等在内的丰富外设接口，便于连接各类传感器和执行器，满足多样化的 IoT 原型开发需求。

本文通过配置通用定时器TIM1的三个通道输出不同占空比的PWM信号以验证功能。

1.工程搭建，参考：

https://blog.csdn.net/weixin_44929802/article/details/145395456

2.测试代码

查询GD32VW553系列数据手册，可知PA0/PA1/PA2三个IO口的复用功能AF1分别是TIM1的CH0/CH1/CH2，以此编写代码：

void pwm_gpio_config(void)
{
    rcu_periph_clock_enable(RCU_GPIOA);
 
    //配置PA0,PA1,PA2为复用功能1
    gpio_mode_set(GPIOA, GPIO_MODE_AF, GPIO_PUPD_NONE, GPIO_PIN_0);
    gpio_output_options_set(GPIOA, GPIO_OTYPE_PP, GPIO_OSPEED_MAX,GPIO_PIN_0);
    gpio_af_set(GPIOA, GPIO_AF_1, GPIO_PIN_0);
 
    gpio_mode_set(GPIOA, GPIO_MODE_AF, GPIO_PUPD_NONE, GPIO_PIN_1);
    gpio_output_options_set(GPIOA, GPIO_OTYPE_PP, GPIO_OSPEED_MAX,GPIO_PI0N_1);
    gpio_af_set(GPIOA, GPIO_AF_1, GPIO_PIN_1);
 
    gpio_mode_set(GPIOA, GPIO_MODE_AF, GPIO_PUPD_NONE, GPIO_PIN_2);
    gpio_output_options_set(GPIOA, GPIO_OTYPE_PP, GPIO_OSPEED_MAX,GPIO_PIN_2);
    gpio_af_set(GPIOA, GPIO_AF_1, GPIO_PIN_2);
}
 
 
void timer1_config(void)
{
    /* -----------------------------------------------------------------------
    通过TIMER1的3个通道输出不同占空比的PWM信号:
    TIM1时钟 = SystemCoreClock / 160 = 1MHz
    PWM频率=1M/(999+1)=1kHz
    ----------------------------------------------------------------------- */
    rcu_timer_clock_prescaler_config(RCU_TIMER_PSC_MUL4);
    rcu_periph_clock_enable(RCU_TIMER1);
    timer_deinit(TIMER1);
 
    //TIM1配置
    timer_parameter_struct timer_initpara;
    timer_initpara.prescaler         = 159;//预分频1MHz
    timer_initpara.alignedmode       = TIMER_COUNTER_EDGE;//边缘对齐
    timer_initpara.counterdirection  = TIMER_COUNTER_UP;//向上计数
    timer_initpara.period            = 999;//频率1M/(999+1)=1kHz
    timer_initpara.clockdivision     = TIMER_CKDIV_DIV1;
    timer_initpara.repetitioncounter = 0;
    timer_init(TIMER1,&timer_initpara);
 
    //PWM输出配置
    timer_oc_parameter_struct timer_ocintpara;
    timer_ocintpara.outputstate  = TIMER_CCX_ENABLE;
    timer_ocintpara.outputnstate = TIMER_CCXN_DISABLE;
    timer_ocintpara.ocpolarity   = TIMER_OC_POLARITY_HIGH;
    timer_ocintpara.ocnpolarity  = TIMER_OCN_POLARITY_HIGH;
    timer_ocintpara.ocidlestate  = TIMER_OC_IDLE_STATE_LOW;
    timer_ocintpara.ocnidlestate = TIMER_OCN_IDLE_STATE_LOW;
 
    timer_channel_output_config(TIMER1,TIMER_CH_0,&timer_ocintpara);
    timer_channel_output_config(TIMER1,TIMER_CH_1,&timer_ocintpara);
    timer_channel_output_config(TIMER1,TIMER_CH_2,&timer_ocintpara);
 
    timer_channel_output_pulse_value_config(TIMER1,TIMER_CH_0,250);//CH0占空比25%
    timer_channel_output_mode_config(TIMER1,TIMER_CH_0,TIMER_OC_MODE_PWM0);
    timer_channel_output_shadow_config(TIMER1,TIMER_CH_0,TIMER_OC_SHADOW_DISABLE);
 
    timer_channel_output_pulse_value_config(TIMER1,TIMER_CH_1,500);//CH1占空比50%
    timer_channel_output_mode_config(TIMER1,TIMER_CH_1,TIMER_OC_MODE_PWM0);
    timer_channel_output_shadow_config(TIMER1,TIMER_CH_1,TIMER_OC_SHADOW_DISABLE);
 
    timer_channel_output_pulse_value_config(TIMER1,TIMER_CH_2,750);//CH2占空比75%
    timer_channel_output_mode_config(TIMER1,TIMER_CH_2,TIMER_OC_MODE_PWM0);
    timer_channel_output_shadow_config(TIMER1,TIMER_CH_2,TIMER_OC_SHADOW_DISABLE);
 
    timer_auto_reload_shadow_enable(TIMER1);
    timer_enable(TIMER1);
}

通过逻辑分析仪验证：

PS：该开发板使用GD32 All In One Programmer通过串口烧录程序时，将PC8与VIN短接基本能百分百连接成功