STM32 TIM2 remapping

There are four port usage combinations of TIM2 of stm32:

1. When not remapped, the default four IO ports of TIM2 are PA0, PA1, PA2, and PA3

2. To use the port combination of PA15, PB3, PA2, and PA3, call the following statement for partial remapping:

  RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO, ENABLE); //Remapping requires turning on the AFIO clock

  GPIO_PinRemapConfig(GPIO_PartialRemap1_TIM2, ENABLE);

3. To use the port combination of PA0, PA1, PB10, and PB11, call the following statement for partial remapping:

  RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO, ENABLE); //Remapping requires turning on the AFIO clock

  GPIO_PinRemapConfig(GPIO_PartialRemap2_TIM2, ENABLE);

4. To use the port combination of PA15, PB3, PB10, and PB11, call the following statement for complete remapping:

  RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO, ENABLE); //Remapping requires turning on the AFIO clock

  GPIO_PinRemapConfig(GPIO_FullRemap_TIM2, ENABLE);

At the same time, the JTAG function must be disabled so that PA15, PB3, PB10, and PB11 can output normally.

Fully mapped port configuration function:

1. static void TIM2_GPIO_Config(void) //CH1-PA15 CH2-PB3 CH3-PB10 CH4-PB11 remapping  

2. {  

3.   GPIO_InitTypeDef GPIO_InitStructure;  

4.   RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);   

5.   RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_GPIOB | RCC_APB2Periph_AFIO, ENABLE);   

6.   

7.   GPIO_PinRemapConfig(GPIO_FullRemap_TIM2, ENABLE);  

8.   GPIO_PinRemapConfig(GPIO_Remap_SWJ_JTAGDisable, ENABLE); //Disable JTAG function and use PB3 and PB4 as normal IO ports  

9.       

10.   GPIO_InitStructure.GPIO_Pin = GPIO_Pin_15;  

11.   GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; // Multiplexed push-pull output  

12.   GPIO_InitStructure.GPIO_Speed ​​= GPIO_Speed_50MHz;  

13.   GPIO_Init(GPIOA, &GPIO_InitStructure);  

14.   

15.   GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3 | GPIO_Pin_10 | GPIO_Pin_11;  

16.   GPIO_Init(GPIOB, &GPIO_InitStructure);  

17. }