各位路过的TX,我是一个入门者,前段时间拿到了TI LM3S 811评估板, 在练习32位周期触发模式,但是LED就是没有反应,纠结中...其实也是参考黄智伟先生编写的32位ARM微控制器系统设计与实践第四章的例程.
请帮忙看看程序哪儿有问题,编译通过,就是LED无反应. 谢谢啦#define HWREG(x)   (*((volatile unsigned long*)(x)))  #define SYSCTL_RCGC1          0x400fe104   //时钟选通控制寄存器,TIMER0选通#define SYSCTL_RCGC2          0x400fe108   //GPIOC接收时钟并运行#define SYSCTL_PERIPH_GPIOC   0x00000004#define SYSCTL_PERIPH_TIMER0  0x00010000   //依据时钟选通控制寄存器RCGCCn位定义
#define TIMER0_BASE           0x40030000#define TIMER_0_CTL           0x0000000c#define TIMER_0_CFG           0x00000000#define TIMER_0_TAMR          0x00000004#define TIMER_0_IMR           0x00000018#define TIMER_0_ICR           0x00000024#define TIMER_0_TAILR         0x00000028
#define TIMER_CTL_TEAN        0x00000001#define TIMER_CFG_32_BIT_OS   0x00000001#define TIMER_CFG_32_BIT_PER  0x00000002#define TIMER_A               0x000000ff#define TIMER_TIMA_TIMEOUT    0x00000001#define TIMER_INT_DATA        15000000
#define NVIC_EN0              0xe000e100#define INT_GPIOA             16#define INT_TIMER0A           35
#define GPIO_PORTC_BASE       0x40006000#define GPIO_0_DIR            0x00000400#define GPIO_0_AFSEL          0x00000420#define GPIO_0_DATA           0x00000000#define GPIO_0_DR2R           0x00000500#define GPIO_0_ODR            0x0000050c#define GPIO_0_DEN            0x0000051c
#define PINS1                 0x00000020   // GPIO pin 5
__asm void  CPUcpsie (void){  CPSIE   I  BX LR}  void Timer0A_ISR(void){  HWREG(TIMER0_BASE+TIMER_0_ICR) = TIMER_TIMA_TIMEOUT;  HWREG(GPIO_PORTC_BASE+(GPIO_0_DATA+(PINS1<<2))) =(HWREG(GPIO_PORTC_BASE+(GPIO_0_DATA)+(PINS1<<2)))^PINS1;  HWREG(TIMER0_BASE+TIMER_0_CTL)|=TIMER_A&(TIMER_CTL_TEAN);}
int main(void){ HWREG(SYSCTL_RCGC1)|=SYSCTL_PERIPH_TIMER0 & 0x0ffffffff; HWREG(SYSCTL_RCGC2)|=SYSCTL_PERIPH_GPIOC & 0x0ffffffff;
 HWREG(GPIO_PORTC_BASE+GPIO_0_DIR)|=PINS1;           //GPIOPORTC5设置为输出 HWREG(GPIO_PORTC_BASE+GPIO_0_AFSEL)&=~PINS1;   //GPIOPROTC5定义为普通I/O口 HWREG(GPIO_PORTC_BASE+GPIO_0_DR2R)|=PINS1;       //2mA驱动 //HWREG(GPIO_PORTC_BASE+GPIO_0_ODR)|=PINS1;            HWREG(GPIO_PORTC_BASE+GPIO_0_DEN)|=PINS1;
 HWREG(GPIO_PORTC_BASE+(GPIO_0_DATA+(PINS1<<2)))=~PINS1;
 HWREG(TIMER0_BASE+TIMER_0_CTL)&=~(TIMER_CTL_TEAN);   //禁止TIMER0 HWREG(TIMER0_BASE+TIMER_0_CFG)= TIMER_CFG_32_BIT_OS>>24;   //配置GPTMCFG为32为定时器模式,但右移24位why? HWREG(TIMER0_BASE+TIMER_0_TAMR)= TIMER_CFG_32_BIT_PER&255;   //配置为周期定时器模式 HWREG(TIMER0_BASE+TIMER_0_TAILR)= TIMER_INT_DATA /4;   //装载间隔值 HWREG(TIMER0_BASE+TIMER_0_IMR)|=TIMER_TIMA_TIMEOUT;   //TIMERA0中断使能 HWREG(TIMER0_BASE+TIMER_0_CTL)|=TIMER_A&(TIMER_CTL_TEAN);   //启动TIMER0 HWREG(NVIC_EN0)=1<<(INT_TIMER0A-INT_GPIOA);   //使能TIEMER0中断 CPUcpsie(); while(1);} 此帖出自小平头技术问答