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author | Matt Strapp <strap012@umn.edu> | 2021-03-28 10:12:10 -0500 |
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committer | Matt Strapp <strap012@umn.edu> | 2021-03-28 10:12:10 -0500 |
commit | f3f8cbd69e290ccbd60f9cbc0b1d9b63645127bb (patch) | |
tree | dd3ab9128eee3ca38e86f83d705526d596c0f732 /PICCode.X/main.c | |
parent | Added intial PIC24 Firmware (diff) | |
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Add a basic VtoI function
Also rearrange things and commit iconoclasm
Diffstat (limited to 'PICCode.X/main.c')
-rw-r--r-- | PICCode.X/main.c | 95 |
1 files changed, 95 insertions, 0 deletions
diff --git a/PICCode.X/main.c b/PICCode.X/main.c new file mode 100644 index 0000000..d9a7126 --- /dev/null +++ b/PICCode.X/main.c @@ -0,0 +1,95 @@ +#include "xc.h" +#include <stdio.h> +#include "bufferlib.h" +#include "lcd.h" + + +// CW1: FLASH CONFIGURATION WORD 1 (see PIC24 Family Reference Manual 24.1) +#pragma config ICS = PGx1 // Comm Channel Select (Emulator EMUC1/EMUD1 pins are shared with PGC1/PGD1) +#pragma config FWDTEN = OFF // Watchdog Timer Enable (Watchdog Timer is disabled) +#pragma config GWRP = OFF // General Code Segment Write Protect (Writes to program memory are allowed) +#pragma config GCP = OFF // General Code Segment Code Protect (Code protection is disabled) +#pragma config JTAGEN = OFF // JTAG Port Enable (JTAG port is disabled) + + +// CW2: FLASH CONFIGURATION WORD 2 (see PIC24 Family Reference Manual 24.1) +#pragma config I2C1SEL = PRI // I2C1 Pin Location Select (Use default SCL1/SDA1 pins) +#pragma config IOL1WAY = OFF // IOLOCK Protection (IOLOCK may be changed via unlocking seq) +#pragma config OSCIOFNC = ON // Primary Oscillator I/O Function (CLKO/RC15 functions as I/O pin) +#pragma config FCKSM = CSECME // Clock Switching and Monitor (Clock switching is enabled, + // Fail-Safe Clock Monitor is enabled) +#pragma config FNOSC = FRCPLL // Oscillator Select (Fast RC Oscillator with PLL module (FRCPLL)) + +volatile int adValue; + +void __attribute__((__interrupt__,__auto_psv__)) _ADC1Interrupt(void) { + _AD1IF = 0; + + putVal(ADC1BUF0); //Grab latest sampled value after conversion and place it in buffer +} + +void __attribute__((__interrupt__,__auto_psv__)) _T2Interrupt(void) { + _T2IF = 0; + + adValue = getAvg(); //Grab average buffer value every 100ms +} + +void setup (void) { + AD1PCFG = 0x9FFC; //Set pin RA0, RA1 as analog + TRISA = 0x0003; //Set pin RA0, RA1 as an input + + T2CON = 0; //Set up timer 2 to have a delay of 100ms + PR2 = 24999; //and enable the interrupt for timer 2 + T2CONbits.TCKPS = 2; + T2CONbits.TON = 1; + _T2IE = 1; + _T2IF = 0; + + I2C1CONbits.I2CEN = 0; //Disable I2C2 to safely change Baud Rate + I2C1BRG = 0x9D; //Set Baud Rate to 100kHz + I2C1CONbits.I2CEN = 1; //Enable I2C2 for project use + _MI2C1IF = 0; //clear I2C2 flag + + T3CON = 0; //Set up timer 3 with a delay of 62.5ms for + PR3 = 15625; //use with ADC conversions on pin RA0 + T3CONbits.TCKPS = 2; + T3CONbits.TON = 1; + + AD1CON1 = 0, AD1CON2 = 0, AD1CON3 = 0; + _AD1IE = 1; + _AD1IF = 0; + AD1CON1bits.ASAM = 1; //Turn on automatic sampling + AD1CON1bits.SSRC = 2; //Use timer 3 to end sampling time + + AD1CON2bits.VCFG = 0; //Configure reference voltages to be Vdd and GND + AD1CON2bits.SMPI = 0; //Interrupt after completion of every conversion + + AD1CON3bits.SAMC = 1; //Set Tsmp = 1*Tad + AD1CON3bits.ADCS = 1; //Set Tad = 2*Tcy + + AD1CON1bits.ADON = 1; //Turn on ADC1 Peripheral +} + +double VtoI(float value) { + //TODO: Verify this. I've done a few and the error seems to be no more than 0.5 mA + //MAKE SURE THE ERROR IS NEVER >=1.0mA (as per project description) + return (double) ((value + 0.196) / 0.0335); +} + +int main(void) { + setup(); //Initializing pins and setting up peripherals + initBuffer(); //Clearing the circular buffer + lcd_init(); //Running through LCD initialization sequence + + char adStr[20]; //The string printed to the LCD + + while(1) { + lcd_setCursor(0,0); //Setting the cursor to the top left corner of the display + sprintf(adStr,"%6.4f A",VtoI((3.3/1024)*adValue)); //Formatting the string that will be written + + lcd_printStr(adStr); //Writing the entire string to the display + } + + + return 0; +} |