[GD32F450测试]4、PWM测试

zhjb1

结果多次尝试最后在几个实例的帮助下解决了，直接上代码了。首先在文档头中间变量定义：
uint16_t dut0=1200,dut1=2000,dut2=5000;
int ddut0=1000,ddut1=2000,ddut2=2500;
接着在ioInit()函数中增加Timer1的IO定义：
//enable timer1 clock
rcu_periph_clock_enable(RCU_TIMER1);
rcu_timer_clock_prescaler_config(RCU_TIMER_PSC_MUL4);
adc_clock_config(ADC_ADCCK_PCLK2_DIV4);//config ADC clock
//enable GPIOB
rcu_periph_clock_enable(RCU_GPIOB);
//configure PB3(TIMER1 CH1,CH2,CH3) as alternate function
gpio_mode_set(GPIOB, GPIO_MODE_AF, GPIO_PUPD_NONE, GPIO_PIN_3);
gpio_output_options_set(GPIOB, GPIO_OTYPE_PP, GPIO_OSPEED_50MHZ,GPIO_PIN_3);
gpio_af_set(GPIOB, GPIO_AF_1, GPIO_PIN_3);
gpio_mode_set(GPIOB, GPIO_MODE_AF, GPIO_PUPD_NONE, GPIO_PIN_10);
gpio_output_options_set(GPIOB, GPIO_OTYPE_PP, GPIO_OSPEED_50MHZ,GPIO_PIN_10);
gpio_af_set(GPIOB, GPIO_AF_1, GPIO_PIN_10);
gpio_mode_set(GPIOB, GPIO_MODE_AF, GPIO_PUPD_NONE, GPIO_PIN_11);
gpio_output_options_set(GPIOB, GPIO_OTYPE_PP, GPIO_OSPEED_50MHZ,GPIO_PIN_11);
gpio_af_set(GPIOB, GPIO_AF_1, GPIO_PIN_11);
之后第一Timer1初始化函数，系统时钟是120MHz，以下是按照此来计算的：
//configure the TIMER peripheral
void timeInit(void){
timer_parameter_struct timer_initpara;
timer_oc_parameter_struct timer_ocintpara;
rcu_periph_clock_enable(RCU_TIMER1);
//TIMER1  configuration
timer_deinit(TIMER1);
//TIMER1 configuration
timer_initpara.prescaler         = 119;
timer_initpara.alignedmode       = TIMER_COUNTER_EDGE;
timer_initpara.counterdirection  = TIMER_COUNTER_UP;
timer_initpara.period            = 11999;
timer_initpara.clockdivision     = TIMER_CKDIV_DIV1;
timer_initpara.repetitioncounter = 0;
timer_init(TIMER1,&timer_initpara);
//CH1,CH2 and CH3 configuration in PWM mode
timer_ocintpara.ocpolarity = TIMER_OC_POLARITY_HIGH;
timer_ocintpara.ocidlestate = TIMER_OC_IDLE_STATE_LOW;
timer_ocintpara.outputstate = TIMER_CCX_ENABLE;
timer_channel_output_config(TIMER1,TIMER_CH_1,&timer_ocintpara);
timer_channel_output_config(TIMER1,TIMER_CH_2,&timer_ocintpara);
timer_channel_output_config(TIMER1,TIMER_CH_3,&timer_ocintpara);
timer_channel_output_pulse_value_config(TIMER1,TIMER_CH_1,ddut0);
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,ddut1);
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_channel_output_pulse_value_config(TIMER1,TIMER_CH_3,ddut2);
timer_channel_output_mode_config(TIMER1,TIMER_CH_3,TIMER_OC_MODE_PWM0);
timer_channel_output_shadow_config(TIMER1,TIMER_CH_3,TIMER_OC_SHADOW_DISABLE);
//auto-reload preload enable
timer_auto_reload_shadow_enable(TIMER1);
timer_enable(TIMER1);
}
之后再main主函数前边加上Timer初始化函数调用：
timeInit();
在循环系while中添加改变PWM周期的算法和重写语句：
if(dut0>10000) ddut0=-100;if(dut0<200) ddut0=100;dut0 +=ddut0;
if(dut1>8000) ddut1=-100;if(dut1<200) ddut1=100;dut1 +=ddut1;
if(dut2>15000) ddut2=-150;if(dut2<200) ddut2=150;dut2 +=ddut2;
timer_channel_output_pulse_value_config(TIMER1,TIMER_CH_1,dut0);
timer_channel_output_pulse_value_config(TIMER1,TIMER_CH_2,dut1);
timer_channel_output_pulse_value_config(TIMER1,TIMER_CH_3,dut2);
最后在dispBase()和dispMes()函数中增加显示PWM周期的时间就OK了。硬件连接见照片41，示波器采样3路PWM之1路的波形见照片42，串口显示计数器+ADC+3路PWM数据见图43。
忘了说明了，我的所有实验是基于GPIO_LED实例的。