| 源代码及注释 #define GLOBAL_CLK 1 #include #include #include "def.h" #include "option.h" #include "2440addr.h" #include "2440lib.h" #include "2440slib.h" #include "mmu.h" #include "memtest.h" #include "Mylib.h" #define LED1 (1 << (5 * 2)) #define LED2 (1 << (6 * 2)) #define LED3 (1 << (7 * 2)) #define LED4 (1 << (8 * 2)) #define LEDS (LED1 | LED2 | LED3 | LED4) #define LED1_ON ~(1<<5) #define LED2_ON ~(1<<6) #define LED3_ON ~(1<<7) #define LED4_ON ~(1<<8) #define LED1_OFF (1<<5) #define LED2_OFF (1<<6) #define LED3_OFF (1<<7) #define LED4_OFF (1<<8) void init() { cal_cpu_bus_clk();//在MyLib.h中有定义 Uart_Init(0,115200);//PCLK、波特率为115200 Uart_Select(0);//选择串口0 My_Logo();//在MyLib.h中有定义 } int ADC_Test() { int temp; rADCCON = (1<<14)|(0x31<<6)|(0<<3);//预分频器使能、预分频值为49、通道0 rADCCON |=0x1;// A/D开始转换，开始之后，此位被清除 while(rADCCON&0x1);//检测有没有开始 while(!(rADCCON&0x8000));//检测转换是否结束 temp = rADCDAT0&0x3ff;//返回转换值，正常A/D转换的数值只能通过ADCDAT0寄存器的[9:0]位读取 return temp; } void Main(void) { int temp,Value; U8 key; init(); MMU_Init();//内存初始化 rGPBCON = LEDS; //初始化LED相应引脚为输出 rGPBDAT = rGPBDAT|(LED1_OFF)|(LED2_OFF)|(LED3_OFF)|(LED4_OFF); // LED 灭 rGPBDAT &= ~(0x1); Uart_Printf("nnnPress 'Enter' to refresh the Screenn");//终端提示 while(1) { temp = ADC_Test();//调用A/D转换函数 Value = ((3300/1024)*temp)*1000;//转换成电压值，单位mV，Value值比实际值放大了1000倍 key=Uart_Getch();//等待从键盘接收按键 Beep(2000,100);//蜂鸣器发声函数 // 刷新A/D转换，原因很简单，我们往往在等待按键时调整电位器 temp = ADC_Test(); Value = ((3300/1024)*temp)*1000; rGPBCON = LEDS; //还原GPB的配置，原因调用了蜂鸣器发声函数，改变了GPB原先的配置 if(key==ENTER_KEY)//判断是否按了Enter键 { key=0;//按键清零 rGPBDAT = (~temp)&(~0x1);//输出到LED显示，务必把GPB0清零，否则你将会有麻烦 ^|^ Uart_Printf("nnn%d %% 1000000 %(V%)n",Value);//把电压值输出到终端显示 } else { key=0; Uart_Printf("nnnPress the 'Enter' key!n");//按键非Enter键，提示按键 } } } 程序结果  声明：本人将不会再发表其它相关ARM裸机源代码，包括上传共享资料，望见谅！ |
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