ADC 사용하기

ADC로 전압측정해서 7-Segment로 전압 출력하는 프로그램.

#include "../../../hw_ints.h" #include "../../../hw_adc.h" #include "../../../hw_memmap.h" #include "../../../hw_types.h" #include "../../../src/debug.h" #include "../../../src/gpio.h" #include "../../../src/adc.h" #include "../../../src/interrupt.h" #include "../../../src/sysctl.h" #include "../../../src/watchdog.h" #include "../../../src/timer.h" #include "../rit128x96x4.h" //***************************************************************************** // //! \addtogroup ek_lm3s8962_list //! <h1>Watchdog (watchdog)</h1> //! //! This example application demonstrates the use of the watchdog as a simple //! heartbeat for the system. If the watchdog is not periodically fed, it will //! reset the system. Each time the watchdog is fed, the LED is inverted so //! that it is easy to see that it is being fed, which occurs once every //! second. // //***************************************************************************** //***************************************************************************** // // The error routine that is called if the driver library encounters an error. // //***************************************************************************** #ifdef DEBUG void __error__(char *pcFilename, unsigned long ulLine) { } #endif //***************************************************************************** // The interrupt handler for the watchdog. This feeds the dog (so that the // processor does not get reset) and winks the LED. //***************************************************************************** void WatchdogIntHandler(void) { /* // // Clear the watchdog interrupt. // WatchdogIntClear(WATCHDOG_BASE); // // Invert the GPIO F0 value. // GPIOPinWrite(GPIO_PORTF_BASE, GPIO_PIN_0, GPIOPinRead(GPIO_PORTF_BASE, GPIO_PIN_0) ^ GPIO_PIN_0); */ } void myTimer(void); void printNUM(unsigned int num); void printNUM2(unsigned int num); int main(void) { // Set the clocking to run directly from the crystal. SysCtlClockSet(SYSCTL_SYSDIV_1 | SYSCTL_USE_OSC | SYSCTL_OSC_MAIN | SYSCTL_XTAL_8MHZ); ///GPIOA Set, ADC, Timer Set SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOA); //port A enable SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOC); //port C enable SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOD); //port D enable SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOG); //port G enable SysCtlPeripheralEnable(SYSCTL_PERIPH_ADC); //ADC enable SysCtlPeripheralEnable(SYSCTL_PERIPH_TIMER0); //Timer0 enable //ADCProcessorTrigger()에서 ADC 시작. 프로세서 트리거가 일어날때 작동한다. ADCSequenceConfigure(ADC_BASE, 0, ADC_TRIGGER_PROCESSOR, 0); //ADC0의 sequence를 구성한다.sequence number 0인 ADC를 single ended mode로 setting ADCSequenceStepConfigure(ADC_BASE, 0, 0, ADC_CTL_IE | ADC_CTL_END | ADC_CTL_CH0); //ADC를 사용 가능하게 해준다. ADCSequenceEnable(ADC_BASE, 0); //Port A1,3,5,G0 set to output type GPIOPinTypeGPIOOutput(GPIO_PORTA_BASE, GPIO_PIN_1); //A1 GPIOPinTypeGPIOOutput(GPIO_PORTA_BASE, GPIO_PIN_3); //A3 GPIOPinTypeGPIOOutput(GPIO_PORTA_BASE, GPIO_PIN_5); //A5 GPIOPinTypeGPIOOutput(GPIO_PORTC_BASE, GPIO_PIN_4); //C4 GPIOPinTypeGPIOOutput(GPIO_PORTC_BASE, GPIO_PIN_6); //C6 GPIOPinTypeGPIOOutput(GPIO_PORTD_BASE, GPIO_PIN_1); //D1 GPIOPinTypeGPIOOutput(GPIO_PORTD_BASE, GPIO_PIN_3); //D3 GPIOPinTypeGPIOOutput(GPIO_PORTG_BASE, GPIO_PIN_0); //G0 GPIOPinTypeGPIOOutput(GPIO_PORTG_BASE, GPIO_PIN_1); //G1 TimerConfigure(TIMER0_BASE,TIMER_CFG_32_BIT_PER); //32-BIT PERIODIC TIMER TimerLoadSet(TIMER0_BASE,TIMER_A,6000000); TimerIntEnable(TIMER0_BASE, TIMER_TIMA_TIMEOUT);//Timer0 interrupt enable TimerIntRegister(TIMER0_BASE,TIMER_A, myTimer); //timer interrupt 발생시 myTimer 라는 함수의 이벤트 발생 TimerEnable(TIMER0_BASE,TIMER_A); //Timer Start while(1){} } void myTimer(void) { unsigned int Voltage; unsigned long ulValue; unsigned long readGPIO; unsigned int i; //This function triggers a processor-initiated sample sequence if the sample sequence trigger is //configured to ADC_TRIGGER_PROCESSOR. ADCProcessorTrigger(ADC_BASE, 0); //sample sequence 가 완료될때 까지 대기한다. while(!ADCIntStatus(ADC_BASE, 0, false)){} // Read the value from the ADC. ADCSequenceDataGet(ADC_BASE, 0, &ulValue);//전압 값을 받아옴 Voltage = (int)((3.0/1023)*ulValue*10); //-----------폼으로 껌뻑이게 했음----------------------// if(GPIOPinRead(GPIO_PORTG_BASE,GPIO_PIN_0)) GPIOPinWrite(GPIO_PORTG_BASE,GPIO_PIN_0,0); else GPIOPinWrite(GPIO_PORTG_BASE,GPIO_PIN_0,GPIO_PIN_0); //-----------폼으로 껌뻑이게 했음----------------------// printNUM(Voltage%10); printNUM2(Voltage/10); TimerIntClear(TIMER0_BASE,TIMER_TIMA_TIMEOUT);//Timer Interupt clear } void printNUM(unsigned int num) { if (num&1) GPIOPinWrite(GPIO_PORTA_BASE,GPIO_PIN_5,GPIO_PIN_5); else GPIOPinWrite(GPIO_PORTA_BASE,GPIO_PIN_5,0); if (num&2) GPIOPinWrite(GPIO_PORTA_BASE,GPIO_PIN_3,GPIO_PIN_3); else GPIOPinWrite(GPIO_PORTA_BASE,GPIO_PIN_3,0); if (num&4) GPIOPinWrite(GPIO_PORTA_BASE,GPIO_PIN_1,GPIO_PIN_1); else GPIOPinWrite(GPIO_PORTA_BASE,GPIO_PIN_1,0); if (num&8) GPIOPinWrite(GPIO_PORTC_BASE,GPIO_PIN_4,GPIO_PIN_4); else GPIOPinWrite(GPIO_PORTC_BASE,GPIO_PIN_4,0); } void printNUM2(unsigned int num) { if (num&1) GPIOPinWrite(GPIO_PORTC_BASE,GPIO_PIN_6,GPIO_PIN_6); else GPIOPinWrite(GPIO_PORTC_BASE,GPIO_PIN_6,0); if (num&2) GPIOPinWrite(GPIO_PORTG_BASE,GPIO_PIN_1,GPIO_PIN_1); else GPIOPinWrite(GPIO_PORTG_BASE,GPIO_PIN_1,0); if (num&4) GPIOPinWrite(GPIO_PORTD_BASE,GPIO_PIN_3,GPIO_PIN_3); else GPIOPinWrite(GPIO_PORTD_BASE,GPIO_PIN_3,0); if (num&8) GPIOPinWrite(GPIO_PORTD_BASE,GPIO_PIN_1,GPIO_PIN_1); else GPIOPinWrite(GPIO_PORTD_BASE,GPIO_PIN_1,0); }

7Segment 로 입력전압을 측정결과를 출력해야 하는데

7세그먼트가 맛이 간것인지.... 불이 안들어오는 부분이 많아서 테스트를 제대로 못해봤다.

그래서 대충~ 전압값에 따라서 다른핀으로 출력을 하도록 만들었는데 뭔가 좀 잘못된듯 하다. -_-;;

7segment 를 다시 구해서 잘 해봐야 겠다.

약간의 삽질을 해본 결과 몇개의 7 Segment는 맛이간것이 맞았다.

하다가 보니까 LED 들어오는지 확인할 수 있는 핀이 있었다는것을 알아냈다. ㅋ 써있는데도 모르고 있다가 우연히 꼽았는데 알게되었다.  light 테스트 핀에 연결하니 확실하게 테스트가 가능했다.

CPU 특성상 3V 에 해상도가 1K라서 Voltage 계산법이 저렇게 되어있다.