diff options
Diffstat (limited to 'EE3102Testing.X/spies046_lab6_lcdLib_v001.c')
| -rw-r--r-- | EE3102Testing.X/spies046_lab6_lcdLib_v001.c | 140 |
1 files changed, 140 insertions, 0 deletions
diff --git a/EE3102Testing.X/spies046_lab6_lcdLib_v001.c b/EE3102Testing.X/spies046_lab6_lcdLib_v001.c new file mode 100644 index 0000000..3358b6a --- /dev/null +++ b/EE3102Testing.X/spies046_lab6_lcdLib_v001.c @@ -0,0 +1,140 @@ +/*
+ * File: spies046_lab6_lcdLib_v001.c
+ * Author: micha
+ *
+ * Created on April 14, 2020, 6:19 PM
+ */
+
+
+#include "xc.h"
+#include "spies046_lab6_asm_v001.h"
+
+volatile char con1 = 0x70;
+volatile char con2 = 0x54;
+volatile int strLength = 0;
+#define CONTRAST 0b00011111
+
+void delay(int msecs) { //Delay for 1ms times the input msecs
+ int i = 0;
+ while(i < msecs) {
+ mbs_wait_1ms();
+ i++;
+ }
+ return;
+}
+
+void contrastMask(char conTot) { //Masking the contrast values into the LCD initalization commands
+ con1 |= (conTot & 0x0F);
+ con2 |= (conTot >> 4) & 0x03;
+}
+
+void lcd_cmd(char cmd) {
+ I2C1CONbits.SEN = 1; //Initialize start condition
+ while (I2C1CONbits.SEN == 1); //Wait until start bit is low again
+
+ _MI2C1IF = 0;
+ I2C1TRN = 0b01111100; //Write slave address of LCD
+ while (IFS1bits.MI2C1IF == 0); //Wait until I2C1 interrupt flag is set
+
+ _MI2C1IF = 0; //Reset I2C1 Flag
+ I2C1TRN = 0b00000000; //Write control byte to LCD
+ while (IFS1bits.MI2C1IF == 0); //Wait until I2C1 interrupt flag is set
+
+ _MI2C1IF = 0; //Reset I2C1 Flag
+ I2C1TRN = cmd; //Write package value to LCD
+ while (IFS1bits.MI2C1IF == 0); //Wait until I2C1 interrupt flag is set
+
+ _MI2C1IF = 0; //Reset I2C1 Flag
+ I2C1CONbits.PEN = 1; //Initialize stop condition
+ while (I2C1CONbits.PEN == 1); //Wait until stop bit is low again
+}
+
+void lcd_init(void) {
+ contrastMask(CONTRAST);
+
+ delay(50);
+ lcd_cmd(0b00111000); // function set, normal instruction mode
+ lcd_cmd(0b00111001); // function set, extended instruction mode
+ lcd_cmd(0b00010100); // interval osc
+ lcd_cmd(con1); // contrast C3-C0
+ lcd_cmd(con2); // Ion, Bon, C5-C4
+ lcd_cmd(0b01101100); // follower control
+
+ delay(200);
+ lcd_cmd(0b00111000); // function set, normal instruction mode
+ lcd_cmd(0b00001100); // Display On
+ lcd_cmd(0b00000001); // Clear Display
+
+ delay(2);
+}
+
+void lcd_setCursor(char x, char y) {
+ lcd_cmd(((0x40 * y) + x) | 0x80); //Shift and mask row and column values to set cursor
+} // col can be 0-39, row can be 0-1
+
+void lcd_printChar(char myChar) {
+ I2C1CONbits.SEN = 1; //Initialize start condition
+ while (I2C1CONbits.SEN == 1);
+
+ _MI2C1IF = 0;
+ I2C1TRN = 0b01111100; //Write slave address to LCD
+ while (IFS1bits.MI2C1IF == 0);
+
+ _MI2C1IF = 0;
+ I2C1TRN = 0b01000000; //Write control value to LCD w/ Co=0 (only one being written)
+ while (IFS1bits.MI2C1IF == 0);
+
+ _MI2C1IF = 0;
+ I2C1TRN = myChar; //Write character value to LCD
+ while (IFS1bits.MI2C1IF == 0);
+
+ _MI2C1IF = 0;
+ I2C1CONbits.PEN = 1; //Initialize stop condition
+ while (I2C1CONbits.PEN == 1);
+}
+
+void lcd_printStr(const char s[]) {
+ int index = 0;
+
+ I2C1CONbits.SEN = 1; //Initialize start condition
+ while (I2C1CONbits.SEN == 1);
+
+ _MI2C1IF = 0;
+ I2C1TRN = 0b01111100; //Write slave address to LCD
+ while (IFS1bits.MI2C1IF == 0);
+
+ while (index < 8) { //Only writing string length, not whole buffer length
+
+ _MI2C1IF = 0;
+ if (index < 7) { //writing control byte to LCD
+ I2C1TRN = 0b11000000; //Co=1 if the byte being written is not the last one
+ } else {
+ I2C1TRN = 0b01000000; //Co=0 if byte being written is the last one
+ }
+ while (IFS1bits.MI2C1IF == 0);
+
+
+ _MI2C1IF = 0;
+ I2C1TRN = s[index]; //Write character value to LCD
+ while (IFS1bits.MI2C1IF == 0);
+
+ index++;
+ }
+
+ _MI2C1IF = 0;
+ I2C1CONbits.PEN = 1; //Initialize stop condition
+ while (I2C1CONbits.PEN == 1);
+}
+
+void lcd_ShiftL(const char s[]) {
+ lcd_cmd(0b00011000); //Shift display and cursor to the left once
+ lcd_cmd(0b00000001); //Clear the display
+ lcd_printStr(s); //Reprint string on LCD in new position
+}
+
+void findLength(const char s[]) {
+ int index = 0;
+ for (index = 0; s[index] != '\n'; index++) { //Increment strLength if character in string is not \n
+ strLength++; //to find the total length of the string
+ }
+}
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