在这里使用TIM3的通道1和通道2做为A B项的电平捕捉。
由于STM32自带硬件编码器接口,因此只要设置好就可使用,非常强大,下面程序测试通过。
下载地址: http://download.csdn.net/detail/hongkangwl/6815327
- <pre code_snippet_id="144534" snippet_file_name="blog_20140106_1_4739860" name="code" class="cpp">void TIM3_Mode_Config(void)
- {
- //u16 CCR1_Val = 2500;
- //u16 CCR2_Val = 1000;
- GPIO_InitTypeDef GPIO_InitStructure;
- TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
- TIM_ICInitTypeDef TIM_ICInitStructure;
- //TIM_OCInitTypeDef TIM_OCInitStructure;
- /*----------------------------------------------------------------*/
- RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
- GPIO_StructInit(&GPIO_InitStructure);
- /* Configure PA.06,07 as encoder input */
- GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6 | GPIO_Pin_7;
- GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
- GPIO_Init(GPIOA, &GPIO_InitStructure);
- /*----------------------------------------------------------------*/
- RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE); //使能TIM3
- TIM_DeInit(TIM3);
- TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure);
- TIM_TimeBaseStructure.TIM_Period =0xffff; //
- TIM_TimeBaseStructure.TIM_Prescaler =0; //设置预分频:
- TIM_TimeBaseStructure.TIM_ClockDivision =TIM_CKD_DIV1 ; //设置时钟分频系数:不分频
- TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; //向上计数模式
- //TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_CenterAligned1;
- /*初始化TIM2定时器 */
- TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure);
- /*-----------------------------------------------------------------*/
- //编码配置 编码模式
- TIM_EncoderInterfaceConfig(TIM3, TIM_EncoderMode_TI12,
- TIM_ICPolarity_Rising, TIM_ICPolarity_Rising); //TIM_ICPolarity_Rising上升沿捕获
- TIM_ICStructInit(&TIM_ICInitStructure);
- TIM_ICInitStructure.TIM_ICFilter = 6; //比较滤波器
- TIM_ICInit(TIM3, &TIM_ICInitStructure);
- //TIM_ARRPreloadConfig(TIM3, ENABLE);
- // Clear all pending interrupts
- TIM_ClearFlag(TIM3, TIM_FLAG_Update);
- TIM_ITConfig(TIM3, TIM_IT_Update, ENABLE); //使能中断
- //Reset counter
- TIM3->CNT =0;
- TIM_Cmd(TIM3, ENABLE); //使能定时器3
- }
- void TIM_Init(void)
- {
- TIM3_Mode_Config();
- }</pre><br>
- <p></p>
- <pre></pre>
- <br>
- 在主程序中通过串口定时发送。
- <p></p>
- <p></p><pre code_snippet_id="144534" snippet_file_name="blog_20140106_2_2166349" name="code" class="cpp"><pre code_snippet_id="144534" snippet_file_name="blog_20140106_2_2166349" name="code" class="cpp">int main(void)
- {
- SystemInit();// 72m时钟
- SysTick_Init();
- TIM_Init();
- NVIC_Config();
- GPIO_74HC595_Config();
- while (1)
- {
- encoder_num=TIM_GetCounter(TIM3);
- // dis_595(encoder_num,encoder_num);
- }
- }</pre><br>
- <p></p>
- <pre></pre>
- <br>
- <br>
- <p></p>
- </pre>