adc.rar_C8051F310 ADC

/***************************************************************************** 功能:实现ADC采样芯片外的模拟电压，通过LCD显示，并通过串口（J6）发送到PC机 注：试验时把LCD电源跳线（J20_1和J20_2）联接好！ 版本:V1.0 *****************************************************************************/ #include <c8051f310.h> // SFR declarations #include <stdio.h> #include <INTRINS.H> //----------------------------------------------------------------------------- // 16-bit SFR Definitions for 'F02x //----------------------------------------------------------------------------- sfr16 DP = 0x82; // data pointer数据指针 sfr16 TMR3RL = 0x92; // Timer3 reload value计数器/定时器3重载值 sfr16 TMR3 = 0x94; // Timer3 counter计数器/定时器3 sfr16 ADC0 = 0xbd; // ADC0 data sfr16 ADC0GT = 0xc4; // ADC0 greater than window ADC0下限(大于)比较字 sfr16 ADC0LT = 0xc6; // ADC0 less than window ADC0上限（小于）比较字 sfr16 RCAP2 = 0xca; // Timer2 capture/reload sfr16 T2 = 0xcc; // Timer2 #define BAUDRATE 9600 // Baud rate of UART in bps 波特率 #define SYSCLK 24500000 // SYSCLK frequency in Hz 系统时钟频率 #define SAMPLE_RATE 50000 // Sample frequency in Hz 抽样频率 #define INT_DEC 256 // integrate and decimate ratio void PORT_Init (void); void UART0_Init (void); void ADC0_Init (void); void Timer3_Init (int counts); void ADC0_ISR (void); void Write_CHAR(unsigned char yjchar); void Write_COM(unsigned char yjcom ); void YJ_Init(void); void SPI0_Init (void); long result; unsigned char NCDdata[10]={0x30}; //------------------------------------------------------------------------------ //main //------------------------------------------------------------------------------ void main (void) { int temp_int, temp_frac,i; // integer and fractional portions of unsigned int temperature; long x; // Disable Watchdog timer PCA0MD &= ~0x40; // WDTE = 0 (clear watchdog timer 看门狗定时器被禁止 // enable) OSCICN |= 0x03; // Set internal oscillator to highest SYSCLK为内部振荡器输出 // setting (24500000) PORT_Init (); // initialize crossbar and GPIO UART0_Init (); // initialize UART0 SPI0_Init (); 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 while (1) { EA = 0; // 关中断 temperature = result; temperature &=0x000fff; EA = 1; //开中断 temperature = temperature*100L*3/1024; temp_int = temperature/100; temp_frac = temperature - (temp_int * 100); for(x=0;x<4000;x++); for(x=0;x<4000;x++); printf ("V_input is %02d.%02dV\n", temp_int, temp_frac); YJ_Init(); NCDdata[0]=temp_int/100+0x30;NCDdata[1]=(temp_int%100)/10+0x30;NCDdata[2]=(temp_int%100)%10+0x30;NCDdata[3]=0x2e; NCDdata[4]=temp_frac/10+0x30;NCDdata[5]=temp_frac%10+0x30;NCDdata[6]=0x20;NCDdata[7]=0x20;NCDdata[8]=0x20; NCDdata[9]=0x20;NCDdata[10]=0x20;NCDdata[11]=0x20;NCDdata[12]=0x20;NCDdata[13]=0x20;NCDdata[14]=0x20; YJ_Init(); for(i=0;i<6;i++) { Write_CHAR(NCDdata[i]);} } } //----------------------------------------------------------------------------- // PORT配置 //----------------------------------------------------------------------------- void PORT_Init (void) { P0SKIP = 0xCE; //端口0跳过寄存器 p0.0,p0.4,p0.5被交叉开关跳过 P1SKIP = 0x7F; //p1.7被交叉开关跳过 XBR0 = 0x03; // Enable UART on P0.4(TX) and P0.5(RX) // SPI I/O连到端口引脚;UART TX0,RX0连到端口引脚P0.4和P0.5 XBR1 = 0x40; // Enable crossbar and weak pull-ups //弱上拉使能；交叉开关使能；T1、T0、ECI、所有的PCA　I/O都不连到端口引脚 P2MDIN = 0xef; //P2.4配置为模拟输入 // P1SKIP = 0x02; P0MDOUT |= 0xff; // enable TX0 as a push-pull output P0.7-0.0输出方式为推挽方式 P1MDOUT |= 0xff; P2MDOUT |= 0xF7; //P2.3输出方式为漏极开路 P3MDOUT |= 0x04; // P3.3 push-pull output推挽方式 } //----------------------------------------------------------------------------- // UART0配置 //----------------------------------------------------------------------------- // Configure the UART0 using Timer1, for <baudrate> and 8-N-1. void UART0_Init (void) { SCON0 = 0x10; // SCON0: mode 0, 8-bit UART, enable RX UART接收允许 TMOD = 0x20; // TMOD: timer 1, mode 2, 8-bit reload 方式2：自动重装载8位计数器/定时器 TH1 = 0x96; //-(SYSCLK/BAUDRATE/16); // set Timer1 reload value for baudrate TR1 = 1; // start Timer1 // 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 = 0xc5; // ADC0 T3定时采样 REF0CN = 0x0e; // 启用内部基准源 AMX0P = 0X0C; // 选择采样输入源P2.4作为正输入 AMX0N=0X1F; //选择采样输入源GND作为负输入ADC工作在单端方式 ADC0CF = 0x38; EIE1 |= 0x08; // 启用 ADC 中断 } //----------------------------------------------------------------------------- // Timer3配置，T3定时启动ADC //----------------------------------------------------------------------------- void Timer3_Init (int counts) { CKCON=0X80; TMR3RL = -counts; TMR3 = 0xffff; EIE1 &= ~0x80;//禁止定时器3中断 TMR3CN |= 0x04;//定时器3允许 } //----------------------------------------------------------------------------- // ADC0采样中断 //----------------------------------------------------------------------------- void ADC0_ISR (void) interrupt 10 { static unsigned int_dec=INT_DEC; static long accumulator=0L; ADC0CN &= ~0x20; // 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) { // 累加完了吗？ int_dec = INT_DEC; // 指针复位 result = accumulator>>8; accumulator = 0L; // 累加和变量清0 } } //------------------------------------------------------------------------------ //END OF FILE