c - STM32F103RC TIM3 不工作

Question

我想用 TIM3 来控制 Helm 机。我已经将 TIM2 CH1CH2 用于两个伺服系统，但我还需要四个。问题是我在引脚上没有发现 PWM 输出。 下面是我的代码，我很困惑只要 TIM2 已经在工作，它怎么会出错。会有任何冲突吗？我检查了我的项目并确定我没有在其他任何地方使用 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。我使用以下方法打开了所有 RCC 时钟:

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

然而，在 PA6,7 处，SPI(以及我尚未验证的其他一些外设)和 TIM3 之间存在冲突。
是冲突导致了问题。