GPIO multiplexing (remapping) - DG32

GPIO multiplexing (remapping) - DG32

/*!
    \brief      configure GPIO pin remap
    \param[in]  gpio_remap: select the pin to remap
                only one parameter can be selected which are shown as below:
      \arg        GPIO_SPI0_REMAP: SPI0 remapping
      \arg        GPIO_I2C0_REMAP: I2C0 remapping
      \arg        GPIO_USART0_REMAP: USART0 remapping
      \arg        GPIO_USART1_REMAP: USART1 remapping
      \arg        GPIO_USART2_PARTIAL_REMAP: USART2 partial remapping
      \arg        GPIO_USART2_FULL_REMAP: USART2 full remapping
      \arg        GPIO_TIMER0_PARTIAL_REMAP: TIMER0 partial remapping 
      \arg        GPIO_TIMER0_FULL_REMAP: TIMER0 full remapping
      \arg        GPIO_TIMER2_PARTIAL_REMAP: TIMER2 partial remapping
      \arg        GPIO_TIMER2_FULL_REMAP: TIMER2 full remapping
      \arg        GPIO_TIMER3_REMAP: TIMER3 remapping
      \arg        GPIO_CAN0_PARTIAL_REMAP: CAN0 partial remapping
      \arg        GPIO_CAN0_FULL_REMAP: CAN0 full remapping
      \arg        GPIO_PD01_REMAP: PD01 remapping
      \arg        GPIO_ADC0_ETRGINS_REMAP: ADC0 external trigger inserted conversion remapping
      \arg        GPIO_ADC0_ETRGREG_REMAP: ADC0 external trigger regular conversion remapping
      \arg        GPIO_ADC1_ETRGINS_REMAP: ADC1 external trigger inserted conversion remapping
      \arg        GPIO_ADC1_ETRGREG_REMAP: ADC1 external trigger regular conversion remapping
      \arg        GPIO_CAN1_REMAP: CAN1 remapping
      \arg        GPIO_SWJ_NONJTRST_REMAP: full SWJ(JTAG-DP + SW-DP),but without NJTRST
      \arg        GPIO_SWJ_SWDPENABLE_REMAP: JTAG-DP disabled and SW-DP enabled
      \arg        GPIO_SWJ_DISABLE_REMAP: JTAG-DP disabled and SW-DP disabled
      \arg        GPIO_SPI2_REMAP: SPI2 remapping
      \arg        GPIO_TIMER8_REMAP: TIMER8 remapping
      \arg        GPIO_TIMER9_REMAP: TIMER9 remapping
      \arg        GPIO_TIMER10_REMAP: TIMER10 remapping
      \arg        GPIO_TIMER12_REMAP: TIMER12 remapping
      \arg        GPIO_TIMER13_REMAP: TIMER13 remapping
      \arg        GPIO_EXMC_NADV_REMAP: EXMC_NADV connect/disconnect
      \arg        GPIO_CTC_REMAP0: CTC remapping(PD15)
      \arg        GPIO_CTC_REMAP1: CTC remapping(PF0)
    \param[in]  newvalue: ENABLE or DISABLE
    \param[out] none
    \retval     none
*/
void gpio_pin_remap_config(uint32_t remap, ControlStatus newvalue)
{
    uint32_t remap1 = 0U, remap2 = 0U, temp_reg = 0U, temp_mask = 0U;

    if(((uint32_t)0x80000000U) == (remap & 0x80000000U)){
        /* get AFIO_PCF1 regiter value */
        temp_reg = AFIO_PCF1;
    }else{
        /* get AFIO_PCF0 regiter value */
        temp_reg = AFIO_PCF0;
    }

    temp_mask = (remap & PCF_POSITION_MASK) >> 0x10U;
    remap1 = remap & LSB_16BIT_MASK;

    /* judge pin remap type */
    if((PCF_LOCATION1_MASK | PCF_LOCATION2_MASK) == (remap & (PCF_LOCATION1_MASK | PCF_LOCATION2_MASK))){
        temp_reg &= PCF_SWJCFG_MASK;
        AFIO_PCF0 &= PCF_SWJCFG_MASK;
    }else if(PCF_LOCATION2_MASK == (remap & PCF_LOCATION2_MASK)){
        remap2 = ((uint32_t)0x03U) << temp_mask;
        temp_reg &= ~remap2;
        temp_reg |= ~PCF_SWJCFG_MASK;
    }else{
        temp_reg &= ~(remap1 << ((remap >> 0x15U)*0x10U));
        temp_reg |= ~PCF_SWJCFG_MASK;
    }
    
    /* set pin remap value */
    if(DISABLE != newvalue){
        temp_reg |= (remap1 << ((remap >> 0x15U)*0x10U));
    }
    
    if(AFIO_PCF1_FIELDS == (remap & AFIO_PCF1_FIELDS)){
        /* set AFIO_PCF1 regiter value */
        AFIO_PCF1 = temp_reg;
    }else{
        /* set AFIO_PCF0 regiter value */
        AFIO_PCF0 = temp_reg;
    }
}

For some default GPIO pins that are not ordinary GPIO pins, GPIO remapping may be used.

PA15 defaults to JTDI, if you want to configure it as a common IO port,
you need to write the following code:

	//1.GPIO引脚时钟使能
	rcu_periph_clock_enable(A_GPIO_CLK);		
	//2.复用功能时钟使能																															
	rcu_periph_clock_enable(RCU_AF);																		 	
	//3.GPIO配置为推完输出模式
    gpio_init(A_GPIO, GPIO_MODE_OUT_PP, GPIO_OSPEED_50MHZ,A_PIN);				
	//4.重映射配置：JTAG-DP禁用和SW-DP使能	
	gpio_pin_remap_config(GPIO_SWJ_SWDPENABLE_REMAP,ENABLE);

PA15 defaults to JTDO, if you want to configure it as a normal IO port

    //1.GPIO引脚时钟使能	
	rcu_periph_clock_enable(B_GPIO_CLK);		
	//2.复用功能时钟使能																
	rcu_periph_clock_enable(RCU_AF);																			
 
	//3.GPIO配置为复用推完输出模式
    gpio_init(B_GPIO, GPIO_MODE_AF_PP, GPIO_OSPEED_50MHZ, B_PIN);					
	
	//4.重映射配置：TIMER1完全重映射
	gpio_pin_remap_config(GPIO_TIMER1_FULL_REMAP,ENABLE);