117 lines
2.5 KiB
C
117 lines
2.5 KiB
C
#include <LPC17xx.h>
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#include <stdio.h>
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#define RS_CTRL 0x08000000
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#define EN_CTRL 0x10000000
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#define DT_CTRL 0x07800000
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unsigned long result, y, m;
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unsigned long int temp1 = 0, temp2 = 0, i;
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unsigned char flag1 = 0, flag2 = 0;
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unsigned char msg[20];
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void lcd_write(void);
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void port_write(void);
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void delay_lcd(unsigned long);
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void lcd_init(void);
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void lcd_print(unsigned char *);
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void lcd_clear(void);
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void ADC_IRQHandler(void);
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void ADC_init(void);
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int main(void) {
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LPC_GPIO0->FIODIR = DT_CTRL | RS_CTRL | EN_CTRL; // LCD pins as output
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lcd_init(); // Initialize LCD
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lcd_print((unsigned char *)"ADC Val:"); // Idle message
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ADC_init(); // Initialize ADC
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while (1) {
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// idle loop
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}
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}
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void ADC_init(void) {
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LPC_PINCON->PINSEL3 = 3 << 28; // P1.30 as AD0.4
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LPC_SC->PCONP |= 1 << 12; // Power to ADC
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LPC_ADC->ADCR = (1 << 4) | (1 << 21) | (1 << 16); // select AD0.4, burst mode, enable
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LPC_ADC->ADINTEN = (1 << 4); // Enable interrupt for AD0.4
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NVIC_EnableIRQ(ADC_IRQn);
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}
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void ADC_IRQHandler(void) {
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result = (LPC_ADC->ADGDR >> 4) & 0xFFF; // 12-bit ADC result
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lcd_clear();
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lcd_print((unsigned char *)"ADC Val:");
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sprintf((char *)msg, " %lu", result);
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lcd_print(msg);
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y = (LPC_ADC->ADDR4 >> 4) & 0xFFF; // clear done flag
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for(m=0;m<1000000;m++);
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}
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void lcd_init(void) {
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unsigned long int init_command[] =
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{0x30, 0x30, 0x30, 0x20, 0x28, 0x0C, 0x01, 0x80};
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flag1 = 0;
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for (i = 0; i < 8; i++) {
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temp1 = init_command[i];
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lcd_write();
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}
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flag1 = 1;
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delay_lcd(5000);
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}
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void lcd_print(unsigned char *text) {
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unsigned int j = 0;
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while (text[j] != '\0') {
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temp1 = text[j];
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lcd_write();
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j++;
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}
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}
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void lcd_clear(void) {
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flag1 = 0;
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temp1 = 0x01; // clear command
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lcd_write();
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delay_lcd(5000);
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flag1 = 1;
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}
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void lcd_write(void) {
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flag2 = (flag1 == 1) ? 0 : (((temp1 == 0x30) || (temp1 == 0x20)) ? 1 : 0);
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temp2 = temp1 & 0xF0;
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temp2 = temp2 << 19;
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port_write();
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if (!flag2) {
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temp2 = temp1 & 0x0F;
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temp2 = temp2 << 23;
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port_write();
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}
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}
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void port_write(void) {
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LPC_GPIO0->FIOPIN = temp2;
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if (flag1 == 0)
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LPC_GPIO0->FIOCLR = RS_CTRL;
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else
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LPC_GPIO0->FIOSET = RS_CTRL;
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LPC_GPIO0->FIOSET = EN_CTRL;
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delay_lcd(100);
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LPC_GPIO0->FIOCLR = EN_CTRL;
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delay_lcd(50000);
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}
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void delay_lcd(unsigned long r1) {
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unsigned long r;
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for (r = 0; r < r1; r++);
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}
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