From f3f8cbd69e290ccbd60f9cbc0b1d9b63645127bb Mon Sep 17 00:00:00 2001
From: Matt Strapp <strap012@umn.edu>
Date: Sun, 28 Mar 2021 10:12:10 -0500
Subject: Add a basic VtoI function Also rearrange things and commit iconoclasm

---
 PICCode.X/main.c | 95 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 95 insertions(+)
 create mode 100644 PICCode.X/main.c

(limited to 'PICCode.X/main.c')

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;
+}
-- 
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