108 lines
No EOL
1.9 KiB
C
108 lines
No EOL
1.9 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 result, y;
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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 char msg[] = ("ADC: ");
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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 display_adc(unsigned long);
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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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};
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int main() {
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LPC_GPIO0->FIODIR = DT_CTRL | RS_CTRL | EN_CTRL;
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LPC_PINCON->PINSEL3 = 3 << 28;
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LPC_SC->PCONP = 1 << 12;
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LPC_ADC->ADCR = 1 << 4 | 1 << 16 | 1 << 21;
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LPC_ADC->ADINTEN = (1 << 4);
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NVIC_EnableIRQ(ADC_IRQn);
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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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i = 0;
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while (msg[i] != '\0') {
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temp1 = msg[i];
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i++;
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lcd_write();
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}
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display_adc(result);
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while (1);
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}
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void display_adc(unsigned long adc_val) {
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unsigned char digits[4];
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int k;
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digits[0] = (adc_val / 1000) % 10 + 0x30;
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digits[1] = (adc_val / 100) % 10 + 0x30;
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digits[2] = (adc_val / 10) % 10 + 0x30;
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digits[3] = adc_val % 10 + 0x30;
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for (k = 0; k < 4; k++) {
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temp1 = digits[k];
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lcd_write();
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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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void ADC_IRQHandler(void) {
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result = (LPC_ADC->ADGDR & (0xFFF << 4)) >> 4;
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y = (LPC_ADC->ADDR4 & (0xFFF << 4)) >> 4;
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} |