Question

我想使用TIM3来控制伺服系统。我已经将TIM2 CH1CH2用于两个伺服系统，但我还需要四个。问题是我发现引脚没有PWM输出。下面是我的代码，只要TIM2已经在工作，我就会感到困惑，怎么会出错呢。会有什么冲突吗？我已经检查了我的项目，并确信我还没有在任何其他地方使用过TIM3。

GPIO_InitTypeDef GPIO_InitStructure;
TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
TIM_OCInitTypeDef  TIM_OCInitStructure;

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0 | GPIO_Pin_1 | GPIO_Pin_6 | GPIO_Pin_7;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; 
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0 | GPIO_Pin_1;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; 
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOB, &GPIO_InitStructure);
TIM_DeInit(TIM2);
TIM_DeInit(TIM3);
/* Time base configuration */
TIM_TimeBaseStructure.TIM_Period =  500;
TIM_TimeBaseStructure.TIM_ClockDivision =  TIM_CKD_DIV2;
TIM_TimeBaseStructure.TIM_Prescaler = 7199; // 50 Hz
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;

TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);
TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure);

/* PWM1 Mode configuration: Channel 1 */
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;           //produce output when counter < CCR
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;   //set "high" to be effective output
TIM_OCInitStructure.TIM_Pulse = 0;                          // ccr_val
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;

TIM_OC1Init(TIM2, &TIM_OCInitStructure);
TIM_OC2Init(TIM2, &TIM_OCInitStructure);

TIM_OC1Init(TIM3, &TIM_OCInitStructure);
TIM_OC2Init(TIM3, &TIM_OCInitStructure);
TIM_OC3Init(TIM3, &TIM_OCInitStructure);
TIM_OC4Init(TIM3, &TIM_OCInitStructure);

TIM_ARRPreloadConfig(TIM2, ENABLE);
TIM_ARRPreloadConfig(TIM3, ENABLE);

TIM_Cmd(TIM2, ENABLE);
TIM_Cmd(TIM3, ENABLE);

TIM_CtrlPWMOutputs(TIM2, ENABLE);
TIM_CtrlPWMOutputs(TIM3, ENABLE);

Answer 1

问题解决了。我使用：

打开所有RCC时钟

RCC_APB1PeriphClockCmd(((uint32_t)0xFFFFFFFF,ENABLE);
RCC_APB2PeriphClockCmd(((uint32_t)0xFFFFFFFF),ENABLE);

然而，SPI（以及我尚未验证的其他一些外围设备）和PA6,7上的TIM3之间存在冲突。
正是冲突导致了这个问题。

STM32F103RC TIM3无法正常工作

1 个答案: