本人虽然接触STM32快半年了，但是最近才开始系统的学习STM32，建议一边学，一边做东西，能够更快的提升自己
我用的定时器是TIM3，所以我会把我出现的问题，分享给大家，希望大佬多多指教！
因为我先进行部分映射，但是控制某个舵机的PB4引脚却没有反应，所以百度了好久…
应该注意的是PB4在单片机复位后，它是作为JTAG引脚来使用的，也就是说，要使用PB4你需要自己将其配置成普通GPIO，GPIO_PinRemapConfig(GPIO_Remap_SWJ_JTAGDisable,ENABLE);
配置成普通GPIO后，需要进行部分重映射，GPIO_PinRemapConfig(GPIO_PartialRemap_TIM3 , ENABLE);
void TIM3_PWM_Init(u16 arr,u16 psc)
{
GPIO_InitTypeDef GPIO_InitStructure;
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_OCInitTypeDef TIM_OCInitStructure;
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE); //使能定时器3
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB | RCC_APB2Periph_AFIO, ENABLE); //使能GPIO外设和AFIO复用功能模块时钟
GPIO_PinRemapConfig(GPIO_Remap_SWJ_JTAGDisable,ENABLE);
GPIO_PinRemapConfig(GPIO_PartialRemap_TIM3, ENABLE); //Timer3部分重映射 TIM3_CH1->PB4 TIM3_CH2->PB5
//设置该引脚为复用输出模式，输出TIM3 CH2的PWM脉冲波形 GPIOB.5 GPIOB.0 GPIOB.1 GPIOB.4
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5 | GPIO_Pin_0 | GPIO_Pin_1| GPIO_Pin_4; //TIM_CH1 TIM_CH2 TIM_CH3 TIM_CH4
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //复用推挽输出
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOB, &GPIO_InitStructure);//初始化GPIO
//初始化TIM3
TIM_TimeBaseStructure.TIM_Period = arr; //设置在下一个更新事件装入活动的自动重装载寄存器周期的值
TIM_TimeBaseStructure.TIM_Prescaler =psc; //设置用来作为TIMx时钟频率除数的预分频值
TIM_TimeBaseStructure.TIM_ClockDivision = 0; //设置时钟分割：TDTS = Tck_tim
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; //TIM向上计数模式
TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure); //根据TIM_TimeBaseInitStruct中指定的参数初始化TIMx的时间基数单位
//初始化TIM3 Channe12 PWM模式
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1; //选择定时器模式：TIM脉冲宽度调制模式1
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; //比较输出使能
// TIM_OCInitStructure.TIM_OutputNState = TIM_OutputNState_Enable;
TIM_OCInitStructure.TIM_Pulse = 0;
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High; //输出极性：TIM输出比较极性高
// TIM_OCInitStructure.TIM_OCNPolarity = TIM_OCNPolarity_High;
// TIM_OCInitStructure.TIM_OCIdleState = TIM_OCIdleState_Set;
// TIM_OCInitStructure.TIM_OCNIdleState = TIM_OCNIdleState_Reset;
TIM_OC1Init(TIM3, &TIM_OCInitStructure);//根据T指定的参数初始化TIM3 OC1
TIM_OC2Init(TIM3, &TIM_OCInitStructure); //根据T指定的参数初始化TIM3 OC2
TIM_OC3Init(TIM3, &TIM_OCInitStructure);//根据T指定的参数初始化TIM3 OC3
TIM_OC4Init(TIM3, &TIM_OCInitStructure); //根据T指定的参数初始化TIM3 OC4
TIM_OC1PreloadConfig(TIM3, TIM_OCPreload_Enable);
TIM_OC2PreloadConfig(TIM3, TIM_OCPreload_Enable); //使能TIM3在CCR2上的预装载寄存器
TIM_OC3PreloadConfig(TIM3, TIM_OCPreload_Enable);
TIM_OC4PreloadConfig(TIM3, TIM_OCPreload_Enable);
TIM_Cmd(TIM3, ENABLE); //使能TIM3
// TIM_CtrlPWMOutputs(TIM3, ENABLE);
TIM_ARRPreloadConfig(TIM3, ENABLE);
}
main.c
int main(void)
{
u16 led0pwmval=0;
u8 dir=1;
delay_init();
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);
uart_init(115200);
LED_Init();
TIM3_PWM_Init(199,7199); //不分频，PWM=72000000/900=80Khz
while(1)
{
delay_ms(1000);
TIM_SetCompare1(TIM3,5);
delay_ms(1000);
TIM_SetCompare1(TIM3,10);
delay_ms(1000);
TIM_SetCompare2(TIM3,15);
delay_ms(1000);
TIM_SetCompare2(TIM3,20);
delay_ms(1000);
TIM_SetCompare2(TIM3,25);
delay_ms(1000);
TIM_SetCompare3(TIM3,15);
delay_ms(1000);
TIM_SetCompare3(TIM3,20);
delay_ms(1000);
TIM_SetCompare3(TIM3,25);
delay_ms(1000);
TIM_SetCompare4(TIM3,15);
delay_ms(1000);
TIM_SetCompare4(TIM3,20);
delay_ms(1000);
TIM_SetCompare4(TIM3,25);
}
}
舵机1先转，再是舵机2，然后舵机3，最后舵机4