配置GPIO引脚模式时为什么会进入FaultISR！！！！

shunyi zhang

Other Parts Discussed in Thread: TM4C1294NCPDT, TM4C123GH6PM

SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOD） ;

9 年多前

0 xyz549040622 9 年多前

Guru 65885 points

看着没问题呀，你跟踪下，是哪句进入的的FaultISR函数

0 shunyi zhang 9 年多前回复 xyz549040622

Intellectual 290 points

HWREG(ui32Port + GPIO_O_DIR) = ((ui32PinIO & 1) ?
(HWREG(ui32Port + GPIO_O_DIR) | ui8Pins) :
(HWREG(ui32Port + GPIO_O_DIR) & ~(ui8Pins)));//就是这句

0 Michael Sun 9 年多前

TI__Genius 13962 points

楼主要把所有的PD脚都配置为输入吧。PD7比较特殊需要解锁，其他脚都按照正常处理就ok。

试一下这个代码：

#include "driverlib/gpio.h"
#include "inc/hw_gpio.h"

SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOD);

SysCtlDelay(5);

HWREG(GPIO_PORTD_BASE + GPIO_O_LOCK) = GPIO_LOCK_KEY;
HWREG(GPIO_PORTD_BASE + GPIO_O_CR) = 0xFF;

0 shunyi zhang 9 年多前回复 Michael Sun

Intellectual 290 points

我没有设置解锁，但是现在调试已经通过了，PD端口为什么要解锁，不解锁会出现什么问题

0 Michael Sun 9 年多前回复 shunyi zhang

TI__Genius 13962 points

楼主用的哪颗芯片？

说的PD7需要解锁是针对TM4C123x。PD7、PF0和NMI功能复用的，还有JTAG功能脚都有锁，只有执行解锁才能切换GPIO的功能。

0 shunyi zhang 9 年多前回复 Michael Sun

Intellectual 290 points

TM4C129NCPDT

0 xyz549040622 9 年多前回复 shunyi zhang

Guru 65885 points

最简单的说，你把配置特殊功能引脚的那几个IO屏蔽掉，看看是否正确呢，如果正确，那就是那几个的配置问题

0 Michael Sun 9 年多前回复 shunyi zhang

TI__Genius 13962 points

129x需要解锁的就是别的脚了。总之还是JTAG和NMI复用的脚。

上Datasheet，来自TM4C1294NCPDT：

The GPIO commit control registers provide a layer of protection against accidental programming of
critical hardware peripherals. Protection is provided for the GPIO pins that can be used as the four
JTAG/SWD pins and the NMI pin (see “Signal Tables” on page 1781 for pin numbers). Writes to
protected bits of the GPIO Alternate Function Select (GPIOAFSEL) register (see page 770), GPIO
Pull Up Select (GPIOPUR) register (see page 776), GPIO Pull-Down Select (GPIOPDR) register
(see page 778), and GPIO Digital Enable (GPIODEN) register (see page 781) are not committed to
storage unless the GPIO Lock (GPIOLOCK) register (see page 783) has been unlocked and the
appropriate bits of the GPIO Commit (GPIOCR) register (see page 784) have been set.