STM32F103定时器TIM8输出方波问题.

弦子的弦 · 发表于 2015-10-20 04:25:49

单片机是STM32F103ZET6,直接移植原子哥Mini板子上TIM1的程序,软件仿真可以通过.但是改成TIM8后一直调试不出来.
主函数:

[mw_shl_code=c,true]int main(void) { delay_init(); NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2); uart_init(115200); LED_Init(); Buzzer_Init(); TIM8_PWM_Init(899,0); TIM_SetCompare1(TIM8,300); while(1) { } } [/mw_shl_code]

TIM8PWM配置代码:
通过软件仿真发现PC.6一直是低电平.请问这么配置有什么问题?

[mw_shl_code=c,true]void TIM8_PWM_Init(u16 arr,u16 psc) { GPIO_InitTypeDef GPIO_InitStructure; TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure; TIM_OCInitTypeDef TIM_OCInitStructure; RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM8, ENABLE); RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC , ENABLE); GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6; //TIM_CH1 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; GPIO_Init(GPIOC, &GPIO_InitStructure); TIM_TimeBaseStructure.TIM_Period = arr; TIM_TimeBaseStructure.TIM_Prescaler =psc; TIM_TimeBaseStructure.TIM_ClockDivision = 0; TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; TIM_TimeBaseInit(TIM8, &TIM_TimeBaseStructure); / TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM2; // TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; TIM_OCInitStructure.TIM_Pulse = 0; TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High; TIM_OC1Init(TIM8, &TIM_OCInitStructure); TIM_CtrlPWMOutputs(TIM8,ENABLE); TIM_OC1PreloadConfig(TIM8, TIM_OCPreload_Enable); TIM_ARRPreloadConfig(TIM8, ENABLE); TIM_Cmd(TIM8, ENABLE); }[/mw_shl_code] [mw_shl_code=c,true][/mw_shl_code]