127 lines
2.9 KiB
C
127 lines
2.9 KiB
C
#include <LPC17xx.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 int temp1 = 0, temp2 = 0, i, j;
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unsigned char flag1 = 0, flag2 = 0;
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unsigned long result, y; // ADC variables
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unsigned char adc_string[10]; // Buffer for ADC result string
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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 int_to_string(unsigned long num, unsigned char* str);
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unsigned long int init_command[] = {0x30, 0x30, 0x30, 0x20, 0x28, 0x0C, 0x01, 0x80};
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int main() {
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// LCD GPIO setup
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LPC_GPIO0->FIODIR = DT_CTRL | RS_CTRL | EN_CTRL;
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// ADC setup
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LPC_PINCON->PINSEL3 = 3 << 28; // P1.30 function 3
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LPC_SC->PCONP = 1 << 12; // power control
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LPC_ADC->ADCR = 1 << 4 | 1 << 16 | 1 << 21; // ADC4, burst mode, enable
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LPC_ADC->ADINTEN = (1 << 4); // Interrupt enable
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NVIC_EnableIRQ(ADC_IRQn);
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// LCD initialization
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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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while(1) {
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// Convert ADC result to string and display
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int_to_string(result, adc_string);
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// Clear display and reset cursor
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flag1 = 0;
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temp1 = 0x01; // Clear display
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lcd_write();
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temp1 = 0x80; // Set cursor to home
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lcd_write();
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flag1 = 1;
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// Display the ADC result
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i = 0;
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while(adc_string[i] != '\0') {
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temp1 = adc_string[i];
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i++;
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lcd_write();
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}
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delay_lcd(5000000); // Update every ~1 second
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}
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}
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void ADC_IRQHandler(void) {
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result = (LPC_ADC->ADGDR & (0xFFF << 4)) >> 4; // Read 12-bit ADC result
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y = (LPC_ADC->ADDR4 & (0xFFF << 4)) >> 4; // Done bit reset
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}
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void int_to_string(unsigned long num, unsigned char* str) {
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int i = 0, j;
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unsigned char temp;
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// Handle zero case
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if (num == 0) {
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str[0] = '0';
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str[1] = '\0';
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return;
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}
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// Convert number to string (reverse order)
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while (num > 0) {
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str[i++] = (num % 10) + '0';
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num /= 10;
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}
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str[i] = '\0';
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// Reverse the string
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for (j = 0; j < i/2; j++) {
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temp = str[j];
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str[j] = str[i-1-j];
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str[i-1-j] = temp;
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}
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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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}
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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(500000);
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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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return;
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}
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