TM4C129XNCZAD如何配置JTAG口为普通IO用

已配置成功，下载时直接接JLINK也能下载

void GPIOorJTAG(uint8_t gpio_or_jtag) 
{ 
   if(gpio_or_jtag == 0) //配置为JTAG
   { 
       // Change PC0-3 into hardware (i.e. JTAG) pins.  First open the 
       // lock and select the bits we want to modify in the GPIO commit 
       // register. 
       // 
       HWREG(GPIO_PORTC_BASE + GPIO_O_LOCK) = GPIO_LOCK_KEY; 
       HWREG(GPIO_PORTC_BASE + GPIO_O_CR) = 0x0F; 

       // 
       // Now modify the configuration of the pins that we unlocked. 
       // 
       HWREG(GPIO_PORTC_BASE + GPIO_O_AFSEL) |= 0x0F; 

       // 
       // Finally, clear the commit register and the lock to prevent 
       // the pin configuration from being changed accidentally later. 
       // Note that the lock is closed whenever we write to the GPIO_O_CR 
       // register so we need to reopen it here. 
       // 
       HWREG(GPIO_PORTC_BASE + GPIO_O_LOCK) = GPIO_LOCK_KEY; 
       HWREG(GPIO_PORTC_BASE + GPIO_O_CR) = 0x00; 
       HWREG(GPIO_PORTC_BASE + GPIO_O_LOCK) = 0; 
   } 
   else //配置为GPIO
   { 
       // 
       // Change PC0-3 into GPIO inputs. First open the lock and select 
       // the bits we want to modify in the GPIO commit register. 
       // 
       HWREG(GPIO_PORTC_BASE + GPIO_O_LOCK) = GPIO_LOCK_KEY; 
       HWREG(GPIO_PORTC_BASE + GPIO_O_CR) = 0x0F; 

       // 
       // Now modifiy the configuration of the pins that we unlocked. 
       // Note that the DriverLib GPIO functions may need to access 
       // registers protected by the lock mechanism so these calls should 
       // be made while the lock is open here. 
       // 
       HWREG(GPIO_PORTC_BASE + GPIO_O_AFSEL) &= 0xf0; 
       //这里配置GPIO
       GPIOPinTypeGPIOInput(GPIO_PORTC_BASE, GPIO_PIN_2);
       GPIOPinTypeGPIOOutput(GPIO_PORTC_BASE, GPIO_PIN_3);
       GPIOPadConfigSet(GPIO_PORTC_BASE, GPIO_PIN_3, GPIO_STRENGTH_12MA, GPIO_PIN_TYPE_STD);

       // 
       // Finally, clear the commit register and the lock to prevent 
       // the pin configuration from being changed accidentally later. 
       // Note that the lock is closed whenever we write to the GPIO_O_CR 
       // register so we need to reopen it here. 
       // 
       HWREG(GPIO_PORTC_BASE + GPIO_O_LOCK) = GPIO_LOCK_KEY; 
       HWREG(GPIO_PORTC_BASE + GPIO_O_CR) = 0x00; 
       HWREG(GPIO_PORTC_BASE + GPIO_O_LOCK) = 0; 
   } 
}

当配置为普通io使用的时候，如何才能下载呢？理论上是不可以的吧，你是如何实现的。

当配置为普通io使用的时候，如何才能下载呢？理论上是不可以的吧，你是如何实现的。

已配置成功，下载时直接接JLINK也能下载

我试试这段代码。