TM4C123GH6PZ在keil调试中进入了MemManage_Handler

很多用户在使用TI M4的时候，会忽略一个细节，在使能外设模块时钟，直接去操作此模块，会导致进入FaultIsr中断服务入口，导致无法调试。

在函数注释说明有个NOTE，大家可能没有注意到。如下：

//! \note It takes five clock cycles after the write to enable a peripheral
//! before the the peripheral is actually enabled. During this time, attempts
//! to access the peripheral result in a bus fault. Care should be taken
//! to ensure that the peripheral is not accessed during this brief time
//! period.

extern void SysCtlPeripheralEnable(uint32_t ui32Peripheral);

//*****************************************************************************
//
//! Enables a peripheral.
//!
//! \param ui32Peripheral is the peripheral to enable.
//!
//! This function enables a peripheral. At power-up, all peripherals are
//! disabled; they must be enabled in order to operate or respond to register
//! reads/writes.
//!
//! The \e ui32Peripheral parameter must be only one of the following values:
//! \b SYSCTL_PERIPH_ADC0, \b SYSCTL_PERIPH_ADC1, \b SYSCTL_PERIPH_CAN0,
//! \b SYSCTL_PERIPH_CAN1, \b SYSCTL_PERIPH_CCM0,\b SYSCTL_PERIPH_COMP0,
//! \b SYSCTL_PERIPH_EEPROM0, \b SYSCTL_PERIPH_EMAC, \b SYSCTL_PERIPH_EPHY,
//! \b SYSCTL_PERIPH_EPI0,
//! \b SYSCTL_PERIPH_GPIOA, \b SYSCTL_PERIPH_GPIOB, \b SYSCTL_PERIPH_GPIOC,
//! \b SYSCTL_PERIPH_GPIOD, \b SYSCTL_PERIPH_GPIOE, \b SYSCTL_PERIPH_GPIOF,
//! \b SYSCTL_PERIPH_GPIOG, \b SYSCTL_PERIPH_GPIOH, \b SYSCTL_PERIPH_GPIOJ,
//! \b SYSCTL_PERIPH_GPIOK, \b SYSCTL_PERIPH_GPIOL, \b SYSCTL_PERIPH_GPIOM,
//! \b SYSCTL_PERIPH_GPION, \b SYSCTL_PERIPH_GPIOP, \b SYSCTL_PERIPH_GPIOQ,
//! \b SYSCTL_PERIPH_GPIOR, \b SYSCTL_PERIPH_GPIOS, \b SYSCTL_PERIPH_GPIOT,
//! \b SYSCTL_PERIPH_HIBERNATE,
//! \b SYSCTL_PERIPH_I2C0, \b SYSCTL_PERIPH_I2C1, \b SYSCTL_PERIPH_I2C2,
//! \b SYSCTL_PERIPH_I2C3, \b SYSCTL_PERIPH_I2C4, \b SYSCTL_PERIPH_I2C5,
//! \b SYSCTL_PERIPH_I2C6, \b SYSCTL_PERIPH_I2C7, \b SYSCTL_PERIPH_I2C8,
//! \b SYSCTL_PERIPH_I2C9, \b SYSCTL_PERIPH_LCD0,
//! \b SYSCTL_PERIPH_ONEWIRE0,
//! \b SYSCTL_PERIPH_PWM0, \b SYSCTL_PERIPH_PWM1, \b SYSCTL_PERIPH_QEI0,
//! \b SYSCTL_PERIPH_QEI1, \b SYSCTL_PERIPH_SSI0, \b SYSCTL_PERIPH_SSI1,
//! \b SYSCTL_PERIPH_SSI2, \b SYSCTL_PERIPH_SSI3, \b SYSCTL_PERIPH_TIMER0,
//! \b SYSCTL_PERIPH_TIMER1, \b SYSCTL_PERIPH_TIMER2, \b SYSCTL_PERIPH_TIMER3,
//! \b SYSCTL_PERIPH_TIMER4, \b SYSCTL_PERIPH_TIMER5, \b SYSCTL_PERIPH_TIMER6,
//! \b SYSCTL_PERIPH_TIMER7, \b SYSCTL_PERIPH_UART0, \b SYSCTL_PERIPH_UART1,
//! \b SYSCTL_PERIPH_UART2, \b SYSCTL_PERIPH_UART3, \b SYSCTL_PERIPH_UART4,
//! \b SYSCTL_PERIPH_UART5, \b SYSCTL_PERIPH_UART6, \b SYSCTL_PERIPH_UART7,
//! \b SYSCTL_PERIPH_UDMA, \b SYSCTL_PERIPH_USB0, \b SYSCTL_PERIPH_WDOG0,
//! \b SYSCTL_PERIPH_WDOG1, \b SYSCTL_PERIPH_WTIMER0, \b SYSCTL_PERIPH_WTIMER1,
//! \b SYSCTL_PERIPH_WTIMER2, \b SYSCTL_PERIPH_WTIMER3,
//! \b SYSCTL_PERIPH_WTIMER4, or \b SYSCTL_PERIPH_WTIMER5
//!
//! \note It takes five clock cycles after the write to enable a peripheral
//! before the the peripheral is actually enabled. During this time, attempts
//! to access the peripheral result in a bus fault. Care should be taken
//! to ensure that the peripheral is not accessed during this brief time
//! period.

//!
//! \return None.
//
//*****************************************************************************
void
SysCtlPeripheralEnable(uint32_t ui32Peripheral)
{
//
// Check the arguments.
//
ASSERT(_SysCtlPeripheralValid(ui32Peripheral));

//
// Enable this peripheral.
//
HWREGBITW(SYSCTL_RCGCBASE + ((ui32Peripheral & 0xff00) >> 8),
ui32Peripheral & 0xff) = 1;
}

有两种解决方法：

1.直接系统延时

SysCtlPeripheralEnable(SYSCTL_PERIPH_TIMER0);

SysCtlDelay(6)；

2.等待模块时钟配置成功

SysCtlPeripheralEnable(SYSCTL_PERIPH_TIMER0);

while(!SysCtlPeripheralReady(SYSCTL_PERIPH_TIMER0)); //读取其模块时钟状态

还有，你gpio置0和置1的最后一个参数，重新看看。拉低IO是直接写0，而不是取反GPIO_PIN_0。

改了下  还是没有成功的

#include <stdint.h>
#include <stdbool.h>
#include "inc/hw_types.h"
#include "inc/hw_memmap.h"
#include "driverlib/sysctl.h"
#include "driverlib/gpio.h"

//*****************************************************************************
//
// Define pin to LED color mapping.
//
//*****************************************************************************

//*****************************************************************************
//
//! \addtogroup example_list
//! <h1>Project Zero (project0)</h1>
//!
//! This example demonstrates the use of TivaWare to setup the clocks and
//! toggle GPIO pins to make the LED's blink. This is a good place to start
//! understanding your launchpad and the tools that can be used to program it.
//
//*****************************************************************************

#define RED_LED GPIO_PIN_1
#define BLUE_LED GPIO_PIN_2
#define GREEN_LED GPIO_PIN_3

int i;

//*****************************************************************************
//
// The error routine that is called if the driver library encounters an error.
//
//*****************************************************************************
#ifdef DEBUG
void
__error__(char *pcFilename, uint32_t ui32Line)
{
}
#endif

//*****************************************************************************
//
// Main 'C' Language entry point. Toggle an LED using TivaWare.
//
//*****************************************************************************
int main(void)
{
SysCtlClockSet(SYSCTL_SYSDIV_4|SYSCTL_USE_PLL|SYSCTL_XTAL_16MHZ|
SYSCTL_OSC_MAIN);
SysCtlDelay(6);

SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOB);
while(!SysCtlPeripheralReady(SYSCTL_PERIPH_GPIOD))
{
}

//
// Configure the GPIO port for the LED operation.
//
GPIOPinTypeGPIOOutput(GPIO_PORTD_BASE, RED_LED|BLUE_LED|GREEN_LED);

while(1)
{
//
// Turn on the LED
//
GPIOPinWrite(GPIO_PORTB_BASE, GPIO_PIN_0,GPIO_PIN_0 );

//
// Delay for a bit
//

SysCtlDelay(2000000);

//
// Turn on the LED
//
GPIOPinWrite(GPIO_PORTB_BASE, GPIO_PIN_0, ~GPIO_PIN_0);

//
// Delay for a bit
//
SysCtlDelay(2000000);
}
}

1.让你使能外设后延时，你设置时钟完毕后延时干嘛。

2.你设置的是GPIOB的时钟，判断的是GPIOD的时钟是否准备完毕，不出问题才怪

3.GPIO写操作0的最后一个数据，是0，不应该是~GPIO_PIN_0