本帖最后由 tommorow 于 2015-12-8 13:17 编辑
最近在用定时器实现编码器功能,然后tim2与tim5的io是一样的,就要用到afio,结果找了些资料,写了代码,发现定时器复用并没有实现。。。这代码是将tim2_ch1和ch2从PA0和PA1重映射到PA15和PB3,而计数器没有计数。。后来把代码里的tim2换成了tim3,从PA6PA7重映射到PC6PC7,然后测试结果是可以计数,于是就不理解,难道是tim2复用这部分有问题?
编码器的配置代码
void encoder_Count_Init(void )
{
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_ICInitTypeDef TIM_ICInitStructure;
// Encoder unit connected to TIM3, 4X mode
GPIO_InitTypeDef GPIO_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);
// Enable GPIOA, clock
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_AFIO,ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB | RCC_APB2Periph_AFIO,ENABLE);
GPIO_PinRemapConfig(GPIO_FullRemap_TIM2,ENABLE);
GPIO_StructInit(&GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_15;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_Init(GPIOA, &GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_Init(GPIOB, &GPIO_InitStructure);
NVIC_InitStructure.NVIC_IRQChannel = TIM2_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
TIM_DeInit(ENCODER_TIMER);
TIM_TimeBaseStructInit(&TIM_TimeBaseStructure);
TIM_TimeBaseStructure.TIM_Prescaler = 0x0; // No prescaling
TIM_TimeBaseStructure.TIM_Period = 20000;
TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInit(ENCODER_TIMER, &TIM_TimeBaseStructure);
////////////////////////////////////////////////////////////////////
TIM_EncoderInterfaceConfig(ENCODER_TIMER, TIM_EncoderMode_TI12,TIM_ICPolarity_Rising, TIM_ICPolarity_Rising);
TIM_ICStructInit(&TIM_ICInitStructure);
//TIM_ICInitStructure.TIM_ICFilter = ICx_FILTER;
TIM_ICInit(ENCODER_TIMER, &TIM_ICInitStructure);
// Clear all pending interrupts
TIM_ClearFlag(ENCODER_TIMER, TIM_FLAG_Update);
TIM_ITConfig(ENCODER_TIMER, TIM_IT_Update, DISABLE);
//Reset counter
ENCODER_TIMER->CNT = 0;
// ENC_Clear_Speed_Buffer();
TIM_Cmd(ENCODER_TIMER, ENABLE);
}
买芯片bom2buy
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小平头技术问答
JTAG下载不用的引脚B3,PB4当成普通IO口进行操作
具体步骤如下:
1、打开复用时钟:RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO,EANBLE);
2、调用重映射函数: GPIO_PinRemapConfig(GPIO_Remap_SWJ_JTAGDisable,ENABLE);
进行上述配置后即可将JTAG下载引脚PB3,PB3当成普通GPIO来使用了!同时也可以用SWD方式进行程序的下载和调试
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