17-10-2012, 09:55 PM | #1 |
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Tham gia ngày: Sep 2010
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[Help] Dịch code Mikro C sang CCS
Mình đang làm đồ án về đo khoảng cách dùng srf05, mình tìm trên mạng thấy người ta hướng dẫn làm nhưng code thì viết bằng mikroC. Mình thì chỉ biết CCS thôi. Mình nhờ mọi người giúp giùm mình chuyển code Mikro C sang ccs giùm mình. Mình đang rất cần nên cảm ơn mọi người nhiều.
/* * file : sonar.c * project : Simple UltraSonic Range Finder * author : Bruno Gavand * compiler : mikroC V6.2 * date : september 30, 2006 * * description : * This is a basic ultrasonic range finder, from 30 to 200 centimeters * * target device : * PIC16F877A with 8 Mhz crystal * or any PIC with at least one ADC and PWM channel * * configuration bits : * HS clock * no watchdog * no power up timer * no brown out * LVP disabled * data EE protect disabled * ICD disabled * * see more details and schematic on http://www.micro-examples.com/ */ /******************** * MACRO DEFINITIONS ********************/ /* * ultra sonic pulse length in microseconds */ #define PULSELEN 300 /* * circular buffer size for samples averaging */ #define BUFSIZE 10 /* * LCD PORT * EasyPic2, EasyPic3 : PORTB * EaspyPic4 : PORTD */ #define LCDPORT PORTD #define LCDTRIS TRISD /******************* * GLOBAL VARIABLES *******************/ unsigned char outOfRange ; // out of range flag : set when no echo is detected unsigned int buf[BUFSIZE] ; // samples buffer unsigned char idx = 0 ; // index of current sample in buffer /***************************************** * INTERRUPT SERVICE ROUTINE * This ISR handles TIMER1 overflow only *****************************************/ void interrupt(void) { if(PIR1.TMR1IF) // timer1 overflow ? { outOfRange = 1 ; // set out of range flag PIR1.TMR1IF = 0 ; // clear interrupt flag } } /************ * MAIN LOOP ************/ void main() { ADCON1 = 0 ; // enables ADC TRISA = 0xff ; // PORTA as inputs PORTA = 0 ; TRISC = 0 ; // PORTC as outputs PORTC = 0 ; // TIMER1 settings T1CON = 0b00001100 ; // prescaler 1:1, osc. enabled, not sync, internal clk, stopped #ifdef LCDPORT // init LCD Lcd_Init(&LCDPORT) ; // use EP2/3/4 settings Lcd_Cmd(Lcd_CLEAR) ; // clear display Lcd_Cmd(Lcd_CURSOR_OFF) ; // cursor off Lcd_Out(1, 1, "UltraSonicRanger") ; Lcd_Out(2, 5, "cm") ; #endif // init PWM Channel : 40 Khz, 50% duty cycle PWM1_Init(40000) ; PWM1_Change_Duty(128) ; INTCON.GIE = 1 ; // enable global interrupts INTCON.PEIE = 1 ; // enable peripheral interrupts PIE1.TMR1IE = 0 ; // disable timer 1 interrupt PIR1.TMR1IF = 0 ; // clear timer 1 interrupt flag // forever for(; { unsigned char i ; // general purpose byte unsigned long cm ; // distance in centimeters unsigned char str[4] ; // string for range display // prepare timer T1CON.TMR1ON = 0 ; // stop timer outOfRange = 0 ; // reset out of range flag TMR1H = 0 ; // clear timer1 TMR1L = 0 ; T1CON.TMR1ON = 1 ; // start timer 1 PIE1.TMR1IE = 1 ; // enable timer 1 interrupts on overflow // send pulse PWM1_Start() ; // enable PWM output : transducer is pulsed at ultrasonic frequency Delay_us(PULSELEN) ; // during PULSELEN microseconds PWM1_Stop() ; // stop PWM Delay_us(PULSELEN * 2) ; // do nothing for twice the pulse length duration to prevent false start while(Adc_Read(1) < 1) // while no pulse detected (no signal on ADC channel 1) { if(outOfRange) break ; // to late, out of range } T1CON.TMR1ON = 0 ; // stop timer 1 PIE1.TMR1IE = 0 ; // disable timer 1 interrupts on overflow #ifdef LCDPORT if(outOfRange) // is overrange condtion detected ? { Lcd_Out(2, 8, "OverRange") ; // display overrange message } else if(TMR1H < ((PULSELEN * 6 * Clock_kHz()) / (1000 * 4 * 256))) // is underrange condition detected ? { Lcd_Out(2, 8, "UnderRnge") ; // display underrange message } else // good reading { buf[idx] = TMR1H ; // build a 16 bit value from timer1 buf[idx] <<= 8 ; // MSB buf[idx] += TMR1L ; // LSB // circular buffer idx++ ; // next location if(idx == BUFSIZE) // the end is reached ? { idx = 0 ; // back to start } cm = 0 ; // prepare centimeter averaging for(i = 0 ; i < BUFSIZE ; i++) // for all samples in buffer { cm += buf[i] ; // add to sum } cm /= BUFSIZE ; // average samples /* * cm contains now the number of clock cycles * from the start of the ultrasonic transmission * to the first echo detection * the duration in second is s = cm / (Clock_Khz() * 1000 / 4) * if we admit that sound speed in the air is 340 m/s * the distance in centimeters (forth and back) is d = s * 340 * 100 / 2 * or d = 340 * 100 / 2 * cm / Clock_khz() / 1000 * 4 * d = 34 * 2 / Clock_Khz() */ cm *= 34 * 2 ; // now converts to centimeters cm /= Clock_Khz() ; ByteToStr(cm, str) ; // convert to string Lcd_Out(2, 1, str) ; // print string Lcd_Out(2, 8, " ") ; // clear error message } #endif Delay_ms(10) ; // 10 milliseconds delay before next sample } } |
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