ADC.zip_LPC2148 ADC_LPC2148-ADC_adc in lpc2148_lpc2148

/*============================================================ LPC21XX 串口功能演示 ============================================================== 本例程的CCLK=60M. 晶振采用12M 倍频系数为:5 分频系数为:2 以上设置在Startup.s中设置 */ #include <LPC213X.H> #include <Config.H> #define UART_BAUD(baud) (unsigned int)((FOSC*PLL_M) / (baud * 16)) void Init_Uart0(unsigned int Baud) { /* initialize the serial interface */ PINSEL0 = 0x00000005; /* Enable RxD0 and TxD0 */ U0LCR = 0x83; /* 8 bits, no Parity, 1 Stop bit */ U0DLM=(unsigned char)(Baud>>8); U0DLL = (unsigned char)Baud; U0LCR = 0x03; /* DLAB = 0 */ } void delay (unsigned int i) { /* Delay function */ unsigned int n; while(i>1) { for(n=65535;n>1;n--); i--; } } void Sent_Byte(unsigned char data) { U0THR = data; // 发送数据 while( (U0LSR&0x40)==0 ); // 等待数据发送完毕 } void Sent_Str(unsigned char const *str) { while(1) { if( *str == '\0' ) break; Sent_Byte(*str++); // 发送数据 } } //10K的热敏电阻0-50度所对应的码表值 const unsigned int Temp_code[]= { // 0-25 2843,2718,2599,2486,2379,2277,2180,2087,1999,1916,1836,1760,1688,1619,1553,1490,1430,1373,1319,1266,1217,1169,1124,1081,1039,1000, // 26--50 962,925,891,857,826,795,766,738,711,686,661,638,615,593,573,553,534,515,497,480,464,449,433,419,405, // 51-75 // 392,379,366,355,343,332,321,311,301,292,283,274,265,257,249,242,234,227,220,214,208,201,195,190,184, // 76--100 // 179,174,169,164,159,155,150,146,142,138,134,131,127,124,120,117,114,111,108,105,102,100,97,94,92 }; /*********************************************************************** //查电阻值所对应的温度是多少 ***********************************************************************/ unsigned char check_code(unsigned int k) { unsigned char i; if(k<405)return(51); //大于50度以上都显示为51度 for(i=0;k<Temp_code[i];i++); return (i-1); } /*********************************************************************** //R=30K或20K //RT=10K ***********************************************************************/ unsigned int Totemp(unsigned int AD) { unsigned int Itemp; unsigned int Tk; Tk=1023-AD; Itemp=(unsigned int)(((unsigned long)1000*AD)/Tk); //扩大100倍 return(Itemp); } unsigned char Get_Temp(unsigned int i) { return (check_code(Totemp(i))); //转换温度 } void main(void) { unsigned char temp; unsigned int adata; AD0CR = 0x00200402; /* Setup A/D: 10-bit AIN0 @ 3MHz */ PINSEL1 = 0x01000000; /* enable DAC */ Init_Uart0(UART_BAUD(115200)); for(;;) { AD0CR |=0x01000000; /*START*/ Sent_Str("www.armdiy.com \n") ; while(!(AD0DR&0x80000000)); adata=(AD0DR>>6)&0x000003ff; temp=Get_Temp(adata); Sent_Byte(temp/10+0x30); Sent_Byte(temp%10+0x30); Sent_Str("\n"); delay(200); } }