315 lines
10 KiB
C
Executable File
315 lines
10 KiB
C
Executable File
#include <stdio.h>
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#include <stdlib.h>
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#include <stdint.h>
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#include <stdbool.h>
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#include "TM4C123GH6PM.h" // The Header File for EK-TM4C123GXL LaunchPad
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#include "ez123G.h"
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#include "MyDefines.h" // Your Definitions for the System Configuration
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#define _TIMER_CFG_1632B_TIMER16B (0x4)
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#define _TIMERA_CAPTURE_EVENT_INT_CLR (1 << 2)
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#define _TIMERA_CAPTURE_EVENT_INT (1 << 2)
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#define _TIMERB_CAPTURE_EVENT_INT_CLR (1 << 10)
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#define _TIMERB_CAPTURE_EVENT_INT (1 << 10)
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float SYSTEM_CLOCK_FREQ = 80E6;
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typedef enum EDGE_EVENT{
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FALLING_EDGE,
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RISING_EDGE
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} EDGE_EVENT;
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void Setup_PWM(void);
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void Setup_Timer(void);
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void Setup_GPIO(void);
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uint32_t MeasurePeriod(void);
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uint32_t MeasurePulseWidth(void);
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typedef struct PWM_CONTROL{
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uint16_t load;
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uint16_t cmp;
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} PWM_CONTROL;
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PWM_CONTROL Pwm[]={
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{18150, 4628},
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{6665, 3032},
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{12490, 8118},
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{49996, 37497},
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{8328, 2914}
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};
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// On-board switch
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uint32_t *Sw = (uint32_t *) (((char*)GPIOF)+ (_PIN4 << 2));
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int main()
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{
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PEZOBJ_LCD lcd;
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volatile uint32_t T;
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volatile uint32_t t;
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uint32_t freq;
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double duty;
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char str[100];
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int idx = 0;
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uint8_t i = 0;
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bool preSw = true;
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uint16_t currSw;
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Setup_123G_80MHz(); // Setup System Clock to 80 MHz
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Setup_PWM();
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Setup_Timer();
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Setup_GPIO();
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lcd = ezLCD_Create();
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ezLCD_Connect_DataPort(lcd, GPIOD, PIN_3_0);
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ezLCD_Connect_ENPin(lcd, GPIOE, PIN1);
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ezLCD_Connect_RSPin(lcd, GPIOE, PIN2);
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ezLCD_Connect_RWPin(lcd, GPIOE, PIN3);
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ezLCD_Start(lcd);
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ezLCD_LoadVerticalBargraphFonts(lcd);
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ezLCD_ClearDisplay(lcd);
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//ezLCD_PrintString(lcd, "HELLO WORLD");
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PWM0->_1_CTL &= ~0x01; // Disable PWM Module 0, Generator 1
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PWM1->_3_CTL &= ~0x01; // Disable PWM Module 1, Generator 3
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PWM0->_1_LOAD = Pwm[idx].load;
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PWM0->_1_CMPB = Pwm[idx].cmp;
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PWM1->_3_LOAD = Pwm[idx].load;
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PWM1->_3_CMPB = Pwm[idx].cmp;
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PWM0->_1_CTL |= 0x01; // Disable PWM Module 0, Generator 1
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PWM1->_3_CTL |= 0x01; // Disable PWM Module 1, Generator 3
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while(1){
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currSw = *Sw;
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if (preSw && (!currSw)){
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if (++idx >= (sizeof(Pwm) / sizeof(PWM_CONTROL))) idx = 0;
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PWM0->_1_CTL &= ~0x01; // Disable PWM Module 0, Generator 1
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PWM1->_3_CTL &= ~0x01; // Disable PWM Module 1, Generator 3
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PWM0->_1_LOAD = Pwm[idx].load;
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PWM0->_1_CMPB = Pwm[idx].cmp;
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PWM1->_3_LOAD = Pwm[idx].load;
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PWM1->_3_CMPB = Pwm[idx].cmp;
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PWM0->_1_CTL |= 0x01; // Disable PWM Module 0, Generator 1
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PWM1->_3_CTL |= 0x01; // Disable PWM Module 1, Generator 3
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timer_waitMillis(100);
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}
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preSw = currSw;
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T = MeasurePeriod();
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t = MeasurePulseWidth();
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freq = 1 / (T * (1.25E-8));
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duty = (t * 100)/T ;
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sprintf(str, "%02d: f%d = %d Hz ", i, idx, freq);
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ezLCD_Position(lcd, 0,0);
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ezLCD_PrintString(lcd, str);
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sprintf(str, "Duty = %.1f %% ", duty);
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ezLCD_Position(lcd, 1,0);
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ezLCD_PrintString(lcd, str);
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i = (++i) % 100;
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timer_waitMillis(500);
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}
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}
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void Setup_PWM(void)
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{
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// M0 GEN 1 B PWM 3 PB5 PWM
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// M1 GEN 3 B PWM 7 PF3 LED
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// 1. Enable Clock for PWM Module
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SYSCTL->RCGCPWM |= (_PWM_MODULE0|_PWM_MODULE1);
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while((SYSCTL->PRPWM & (_PWM_MODULE0|_PWM_MODULE1)) != (_PWM_MODULE0|_PWM_MODULE1)){};
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// 2. Enable and Setup Clock Divider for PWM
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SYSCTL->RCC |= (1 << 20); // RCC[20]=1:USEPWMDIV
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SYSCTL->RCC &= ~(0x07 << 17); // RCC[19:17]=000 PWMDIV
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SYSCTL->RCC |= (_PWMDIV_8 << 17); // RCC[19:17]=0x04 divider=/32
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// 3. Disable PWM Generator
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PWM0->_1_CTL &= ~0x01; // Disable PWM Generator 1
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PWM1->_3_CTL &= ~0x01; // Disable PWM Generator 3
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// 4. Configure LOAD (Period), CMP (Initial Duty), GEN (PWM Mode) values
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PWM0->_1_LOAD = 18150;
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PWM0->_1_CMPB = 4628;
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PWM1->_3_LOAD = 18150;
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PWM1->_3_CMPB = 4628;
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PWM0 -> _1_GENB = _PWM_RIGHT_ALIG_CMPBD;
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PWM1 -> _3_GENB = _PWM_RIGHT_ALIG_CMPBD;
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// 5. Enable PWM Generator
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PWM0->_1_CTL |= 0x01;
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PWM1->_3_CTL |= 0x01;
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// 6. Enable PWM Output
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PWM0 -> ENABLE = _PWM3;
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PWM1 -> ENABLE = _PWM7;
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}
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void Setup_Timer(void)
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{
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//PF2 T1CCP0
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// 1 . Enable Clock for TIMER
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SYSCTL->RCGCTIMER |= _TIMER1;
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while ((SYSCTL->PRTIMER & (_TIMER1)) != (_TIMER1)) {}
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// 2. Disable TIMER
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TIMER1->CTL &= ~(_TIMERA_ENABLE);
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// 3. Configure TIMER
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TIMER1->CFG = _TIMER_CFG_1632B_TIMER16B;
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// 4. Configure Timer n Mode: GPTMTAMR
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TIMER1->TAMR = (_TIMERA_COUNTDOWN|_TIMERA_EDGE_TIME|_TIMERA_CAPTURE);
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// 5. Configure Timer Event Mode
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TIMER1->CTL &= ~(0x03 << 2);
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TIMER1->CTL |= _TIMERA_BOTH_EDGES;
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// 6. Configure Load
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TIMER1->TAILR = 0xffff; //0x00000000;
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//Set the prescaler to 0xff
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TIMER1->TAPR = 0xff;
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TIMER1->ICR = _TIMERA_CAPTURE_EVENT_INT_CLR;
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TIMER1->IMR = 0;
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// 7. Enable GPTM Timer
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TIMER1->CTL |= _TIMERA_ENABLE; // Enable Timer
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}
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void Setup_GPIO(void)
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{
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// GPIO Initialization and Configuration
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// 1. Enable Clock to the GPIO Modules (SYSCTL->RCGCGPIO)
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SYSCTL->RCGCGPIO |= (_PORTB|_PORTD|_PORTE|_PORTF);
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// allow time for clock to stabilize (SYSCTL->PRGPIO)
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while((SYSCTL->PRGPIO & (_PORTB|_PORTD|_PORTE|_PORTF)) != (_PORTB|_PORTD|_PORTE|_PORTF)){};
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// 2. Unlock PD7 and/or PF0 on TM4C123G (GPIO->LOCK and GPIO->CR)
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//GPIOF->LOCK = 0x4C4F434B;
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//GPIOF->CR |= _PIN0;
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//GPIOD_AHB->LOCK = 0x4C4F434B;
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//while( (GPIOD_AHB->LOCK & 0x01) == 0x01) {};
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//*(((char*)GPIOD_AHB)+0x524) = 0xFF;
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// 3. GPIO Analog Mode Select (GPIOAMSEL)
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GPIOB -> AMSEL = 0x00;
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GPIOD -> AMSEL = 0x00;
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GPIOE -> AMSEL = 0x00;
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GPIOF -> AMSEL = 0x00;
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// 4. GPIO Port COntrol (GPIOPCTL)
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GPIOB -> PCTL = 0x00400000;
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GPIOD -> PCTL = 0x00;
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GPIOE -> PCTL = 0x00;
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GPIOF -> PCTL = 0x00005700;
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// 5. Clear AFSEL bits to 0 to select regular I/O
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GPIOB -> AFSEL |= _PIN5;
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GPIOD -> AFSEL = 0x0;
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GPIOE -> AFSEL = 0x0;
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GPIOF -> AFSEL |= (_PIN2|_PIN3);
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// 6. GPIO Pin Direction (GPIODIR) 0 for input, 1 for output
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GPIOB -> DIR |= (_PIN5);
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GPIOD -> DIR |= (_PIN0|_PIN1|_PIN2|_PIN3);
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GPIOE -> DIR |= (_PIN1|_PIN2|_PIN3);
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GPIOF -> DIR |= (_PIN3);
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// 7. Set PUR bits to 1 to enable internal pull-up resistor
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GPIOF -> PUR |= (_PIN4);
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// 8. Set DEN bits to 1 to enable data pins
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GPIOB -> DEN |= (_PIN5);
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GPIOD -> DEN |= (_PIN0|_PIN1|_PIN2|_PIN3);
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GPIOE -> DEN |= (_PIN1|_PIN2|_PIN3);
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GPIOF -> DEN |= (_PIN2|_PIN3|_PIN4);
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}
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uint32_t MeasurePeriod(void)
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{
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volatile uint32_t edge1;
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volatile uint32_t edge2;
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uint32_t load;
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// **** Capture firstEgde i.e. rising edge ****
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TIMER1->CTL &= ~(_TIMERA_ENABLE);
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TIMER1->CTL &= ~(0x03 << 2);
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TIMER1->CTL |= _TIMERA_POSITIVE_EDGE; // Capture on the falling- or rising- edgs
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TIMER1->CTL |= _TIMERA_ENABLE;
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//1. Clear GPTM Timer A Capture Mode Event by writing 1 to
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// corresponding bit on GPTMICR (TIMER1->ICR) register (CnERIS bit)
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TIMER1->ICR = _TIMERA_CAPTURE_EVENT_INT_CLR;
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//2. Waiting for capture event by check the GPTM Raw Interrupt Status
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// GPTMRIS (TIMER1->RIS) register
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while ((TIMER1->RIS & _TIMERA_CAPTURE_EVENT_INT) != _TIMERA_CAPTURE_EVENT_INT) {};
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//3. Read the capture value from GPTMTAR (TIMER1->TAR) register
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edge1 = TIMER1->TAR;
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// **** Capture secondEgde i.e. falling edge ****
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//4. Clear GPTM Timer A Capture Mode Event by writing 1 to
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// corresponding bit on GPTMICR (TIMER1->ICR) register
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TIMER1->ICR = _TIMERA_CAPTURE_EVENT_INT_CLR;
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//5. Waiting for capture falling edge event by check the GPTM Raw Interrupt Status
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// GPTMRIS (TIMER1->RIS) register
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while ((TIMER1->RIS & _TIMERA_CAPTURE_EVENT_INT) != _TIMERA_CAPTURE_EVENT_INT) {};
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//6. Read the capture value from GPTMTAR (TIMERa->TAR) register
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edge2 = TIMER1->TAR;
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//7. Calculate deltaT = highEdge - lowEdge
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// Note: the deltaT must large than zero, cannot be negative value
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if(edge1 > edge2){
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return edge1 - edge2;
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}else{
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return (0xFFFFFFFF - (edge2 - edge1));
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}
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}
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uint32_t MeasurePulseWidth(void)
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{
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uint32_t edge1;
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uint32_t edge2;
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static uint32_t load;
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// **** Capture first Rising-Edge ****
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TIMER1->CTL &= ~(_TIMERA_ENABLE);
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TIMER1->CTL &= ~(0x03 << 2);
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TIMER1->CTL |= _TIMERA_POSITIVE_EDGE; // Capture on the Rising-Edge
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TIMER1->CTL |= _TIMERA_ENABLE;
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//1. Clear GPTM Timer A Capture Mode Event by writing 1 to
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// corresponding bit on GPTMICR (TIMER1->ICR) register
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TIMER1->ICR = _TIMERA_CAPTURE_EVENT_INT_CLR;
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//2. Waiting for capture event by check the GPTM Raw Interrupt Status
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// GPTMRIS (TIMER1->RIS) register
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while ((TIMER1->RIS & _TIMERA_CAPTURE_EVENT_INT) != _TIMERA_CAPTURE_EVENT_INT) {};
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//3. Read the capture value from GPTMTAR (TIMER1->TAR) register
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edge1 = TIMER1->TAR;
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TIMER1->CTL &= ~(0x03 << 2);
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TIMER1->CTL |= _TIMERA_NEGATIVE_EDGE; // Capture on the Falling-Edge
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// **** Capture second Egde i.e. falling edge ****
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//4. Clear GPTM Timer A Capture Mode Event by writing 1 to
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// corresponding bit on GPTMICR (TIMER1->ICR) register
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TIMER1->ICR = _TIMERA_CAPTURE_EVENT_INT_CLR;
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//5. Waiting for capture falling edge event by check the GPTM Raw Interrupt Status
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// GPTMRIS (TIMER1->RIS) register
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while ((TIMER1->RIS & _TIMERA_CAPTURE_EVENT_INT) != _TIMERA_CAPTURE_EVENT_INT) {};
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//6. Read the capture value from GPTMTAR (TIMERa->TAR) register
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edge2 = TIMER1->TAR;
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//7. Calculate deltaT = highEdge - lowEdge
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// Note: the deltaT must large than zero, cannot be negative value
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if(edge1 > edge2){
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return edge1 - edge2;
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}else{
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return (0xFFFFFFFF - (edge2 - edge1));
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}
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}
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