UART0.rar_C8051F 串口_c8051f

/*************************************************************** 功能:实现ADC0采样芯片温度，通过LCD显示，并通过串口0（J13）发送到PC机,同时接收PC传回的一个字符并显示， 请使用串口调试工具调试！ 注：试验时把ADC0的工作基准VREF0（J7_5和J7_6或J7_2和J7_6）和LCD电源跳线（J18_1和J18_2）联接好！ 作者:ZDP 时间:2005-11-30 版本:V1.0 用外部基准: J7 NC 1 2 内部VREF 外部VREF 3 4 内部DAC工作基准输入 外部VREF 5---6 内部ADC0工作基准输入 外部VREF 7 8 内部ADC1工作基准输入 或用内部基准: J7 NC 1 2- 内部VREF 外部VREF 3 4 | 内部DAC工作基准输入 外部VREF 5 6- 内部ADC0工作基准输入 外部VREF 7 8 内部ADC1工作基准输入 ***************************************************************/ #include <c8051f020.h> // SFR declarations #include <stdio.h> #include <INTRINS.H> //----------------------------------------------------------------------------- // 16-bit SFR Definitions for 'F02x //----------------------------------------------------------------------------- sfr16 DP = 0x82; // data pointer sfr16 TMR3RL = 0x92; // Timer3 reload value sfr16 TMR3 = 0x94; // Timer3 counter sfr16 ADC0 = 0xbe; // ADC0 data sfr16 ADC0GT = 0xc4; // ADC0 greater than window sfr16 ADC0LT = 0xc6; // ADC0 less than window sfr16 RCAP2 = 0xca; // Timer2 capture/reload sfr16 T2 = 0xcc; // Timer2 sfr16 RCAP4 = 0xe4; // Timer4 capture/reload sfr16 T4 = 0xf4; // Timer4 sfr16 DAC0 = 0xd2; // DAC0 data sfr16 DAC1 = 0xd5; // DAC1 data #define BAUDRATE 115200 // Baud rate of UART in bps #define SYSCLK 22118400 // SYSCLK frequency in Hz #define SAMPLE_RATE 50000 // Sample frequency in Hz #define INT_DEC 256 // integrate and decimate ratio #define AMX0SL_AIN 8 // 0=AIN0....7=AIN7,8=TEMP void SYSCLK_Init (void); void PORT_Init (void); void UART0_Init (void); void ADC0_Init (void); void Timer3_Init (int counts); void ADC0_ISR (void); void LCD_Init(void); //LCD显示数组初值“000.00 ” unsigned char xdata NCDdata[7]={0x30,0x30,0x30,0x2e,0x30,0x30,0x20}; long result; unsigned char *lcdpoint; //指向 lcddata数组的指针 unsigned char lcd_data_count; //要显示的数据个数 void main (void) { long temperature,x; int temp_int, temp_frac; char data1; WDTCN = 0xde; // disable watchdog timer WDTCN = 0xad; SYSCLK_Init (); // initialize oscillator PORT_Init (); // initialize crossbar and GPIO UART0_Init (); // initialize UART0 Timer3_Init (SYSCLK/SAMPLE_RATE); // initialize Timer3 to overflow at // sample rate ADC0_Init (); // init ADC AD0EN = 1; // enable ADC EA = 1; while(result==0); //等于0,侧等待ADC0的第一个数据 while (1) { EA = 0; // 关中断 temperature = result; EA = 1; //开中断 //转换为实际温度数据 temperature = temperature - 42380; temperature = (temperature * 100L) / 156; temp_int = temperature / 100; temp_frac = temperature - (temp_int * 100); printf ("Temperature is %+02d.%02d\n", temp_int, temp_frac);//把温度数据通过串口发送至PC机 if(RI0==1) //只接收PC发过来的一个字符 { NCDdata[6]=SBUF0; //字符数据保存至LCD显示数组中 RI0=0; } //在LCD上显示温度 //LCD显示数据处理 NCDdata[0]=temp_int/100+0x30;NCDdata[1]=(temp_int%100)/10+0x30;NCDdata[2]=(temp_int%100)%10+0x30; NCDdata[4]=temp_frac/10+0x30;NCDdata[5]=temp_frac%10+0x30; LCD_Init(); //LCD初始化 P2 = 0xA0; //准备送数据 lcdpoint=&NCDdata; //取地址 for(lcd_data_count=7;lcd_data_count>0;lcd_data_count--) { data1=*lcdpoint; //读出数据 P3 = data1; //写数据到端口 P2 = 0X20; P2 = 0XA0; //控制LCD lcdpoint++; for(x=0;x<0x5000;x++); } for(data1=0;data1<0x7;data1++) //软件延时 { for(x=0;x<0xffff;x++) {_nop_();} } } } //----------------------------------------------------------------------------- // SYSCLK配置 //----------------------------------------------------------------------------- // 配置系统时钟使用外部晶振22.1184MHz void SYSCLK_Init (void) { int i; // delay counter OSCXCN = 0x67; // start external oscillator with // 22.1184MHz crystal for (i=0; i < 256; i++) ; // XTLVLD blanking interval (>1ms) while (!(OSCXCN & 0x80)) ; // Wait for crystal osc. to settle OSCICN = 0x88; // select external oscillator as SYSCLK // source and enable missing clock // detector } //----------------------------------------------------------------------------- // PORT配置 //----------------------------------------------------------------------------- void PORT_Init (void) { XBR0 = 0x04; // Enable UART0 XBR1 = 0x00; XBR2 = 0x40; // Enable crossbar and weak pull-ups P0MDOUT |= 0x01; // enable TX0 as a push-pull output P2MDOUT = 0xe0; // P2口设为推挽方式 P3MDOUT = 0xff; // P2口设为推挽方式 } //----------------------------------------------------------------------------- // UART0配置 //----------------------------------------------------------------------------- // Configure the UART0 using Timer1, for <baudrate> and 8-N-1. void UART0_Init (void) { SCON0 = 0x50; // SCON0: mode 1, 8-bit UART, enable RX TMOD = 0x20; // TMOD: timer 1, mode 2, 8-bit reload TH1 = -(SYSCLK/BAUDRATE/16); // set Timer1 reload value for baudrate TR1 = 1; // start Timer1 CKCON |= 0x10; // Timer1 uses SYSCLK as time base PCON |= 0x80; // SMOD00 = 1 TI0 = 1; // Indicate TX0 ready } //----------------------------------------------------------------------------- // ADC0配置，T3定时启动ADC //----------------------------------------------------------------------------- void ADC0_Init (void) { ADC0CN = 0x05; // ADC0 T3定时采样,左对齐 REF0CN = 0x07; // 启用内部基准源 AMX0SL = AMX0SL_AIN; // 选择采样输入源 ADC0CF = (SYSCLK/2500000) << 3; // ADC conversion clock = 2.5MHz ADC0CF |= 0x01; // PGA gain = 2 EIE2 |= 0x02; // 启用 ADC 中断 } //----------------------------------------------------------------------------- // Timer3配置，T3定时启动ADC //----------------------------------------------------------------------------- void Timer3_Init (int counts) { TMR3CN = 0x02; TMR3RL = -counts; TMR3 = 0xffff; EIE2 &= ~0x01; TMR3CN |= 0x04; } //----------------------------------------------------------------------------- // ADC0采样中断 //----------------------------------------------------------------------------- void ADC0_ISR (void) interrupt 15 { static unsigned int_dec=INT_DEC; static long accumulator=0L; AD0INT = 0; // 清 ADC 中断标志位 accumulator += ADC0; // 累加ADC采样数据 int_dec--; // 指针减1 if (int_dec == 0) {