u-boot-2014.10 5th day----LED, button, and beep bare metal programs

Today wrote a simple key key to drive the LED and Beep buzzer program, the source code is as follows:

/* Copyright (C) fulinux <[email protected]> * * #define GPFCON (* (unsigned long volatile *) 0x56000050) #d Efine Gpfdat (* (unsigned long volatile *) 0x56000054) #define GPFUP (* (unsigned long volatile *) 0x56000058) #define GPBC On (* (unsigned long volatile *) 0x56000010) #define GPBDAT (* (unsigned long volatile *) 0x56000014) #define GPBUP (* (UN Signed Long volatile *) 0x56000018) #define LED0 5/*led0 use gpb5*/#define LED1 6/*led1 use gpb6*/#define LE D2 7/*led2 Use gpb7*/#define LED3 8/*led3 use gpb8*/#define BEEP 0/*buzzer US GPB0 */#define D         Elay_time 40000000static inline void delay (unsigned long loops) {__asm__ volatile ("1:\n" "Subs%0,%1, #1 \ n" "BNE 1b": "=r" (Loops): "0" (loops));}    void Key_init (void) {/* Set GPF0,GPF1,GPF2,GPF4 as GPIO input mode (XX) */Gpfcon &= ~0x33f;    /* Enable pullup resister */gpfup &= ~0x17; /* Set GPF0,GPF1,GPF2,GPF4 as High level */Gpfdat |= 0x17;} VOID Led_init (void) {/* Set Gpb5,gpb6,gpb7,gpb8 as GPIO output mode */Gpbcon = (Gpbcon & ~0x3fc00) | 0x154    00;    Gpbup &= ~0x01e0; /* Set Gpb5,gpb6,gpb7,gpb8 as high level, to turn led0,led1,led2,led3 off */Gpbdat |= 0x01e0;}               void Beep_init (void) {Gpbcon = (gpbcon|0x3) &0x1;/* Set GPB0 as GPIO output mode (0x01) */Gpbup &= to; /* Enable pullup resister */}void led_off (void) {/* Set Gpb5,gpb6,gpb7,gpb8 as high level, to turn led0,led1,    LED2,LED3 off */Gpbdat |= 0x01e0; Delay (delay_time);}    int main (void) {beep_init ();    Key_init ();    Led_init ();    Led_off ();  while (1) {Gpbdat &= ~ (1<<beep);        /* Set Beep GPIO as low level */while ((Gpfdat & 0x17) = = 0x17) {delay (delay_time);        } gpbdat ^= (0x0f<<led0);  Gpbdat &= ~ (1<<beep);        /* Set Beep GPIO as Low level */delay (delay_time);     Gpbdat |= 1<<beep; /* Set Beep GPIO as HiGH level */delay (delay_time); }}

Other files are similar to those in the previous days.

u-boot-2014.10 5th day----LED, button, and beep bare metal programs