Add ES/Lab/Lab9/LCD_DOUBLELINE.c

ES/Lab/Lab9/LCD_DOUBLELINE.c

@@ -0,0 +1,102 @@
+#include <LPC17xx.h>
+
+#define RS_CTRL 0x08000000
+#define EN_CTRL 0x10000000
+#define DT_CTRL 0x07800000
+
+unsigned int col = 0;
+unsigned long int temp1 = 0, temp2 = 0, i, j;
+unsigned char flag1 = 0, flag2 = 0;
+unsigned char msg[] = ("Long messages work well, heh.");
+
+void lcd_write(void);
+void port_write(void);
+void delay_lcd(unsigned long);
+
+unsigned long int init_command[] = {
+    0x30, 0x30, 0x30, 0x20, 0x28, 0x0C, 0x01, 0x80
+};
+
+#define LCD_COLS 16
+
+int main() {
+    LPC_GPIO0->FIODIR = DT_CTRL | RS_CTRL | EN_CTRL;
+
+    flag1 = 0;
+
+    
+    for (i = 0; i < 8; i++) {
+        temp1 = init_command[i];
+        lcd_write();
+    }
+
+    
+    flag1 = 1;
+
+    
+    i = 0;
+
+    while (msg[i] != '\0') {
+        if (col == LCD_COLS) {
+            flag1 = 0;
+            temp1 = 0xC0;
+            lcd_write();
+
+            flag1 = 1;
+        } else if (col == (LCD_COLS * 2)) {
+            flag1 = 0;
+            temp1 = 0x80;
+            lcd_write();
+
+            flag1 = 1;
+            col = 0;
+        }
+
+        temp1 = msg[i++];
+        lcd_write();
+        col++;
+    }
+
+    while (1)
+        ;
+}
+
+void lcd_write(void) {
+    flag2 = (flag1 == 1) ? 0 :
+            (((temp1 == 0x30) || (temp1 == 0x20)) ? 1 : 0);
+
+    temp2 = temp1 & 0xf0;
+    temp2 = temp2 << 19;
+
+    port_write();
+
+    if (!flag2) {
+        temp2 = temp1 & 0x0f;
+        temp2 = temp2 << 23;
+        port_write();
+    }
+}
+
+void port_write(void) {
+    LPC_GPIO0->FIOPIN = temp2;
+
+    if (flag1 == 0) {
+        LPC_GPIO0->FIOCLR = RS_CTRL;
+    } else {
+        LPC_GPIO0->FIOSET = RS_CTRL;
+    }
+
+    LPC_GPIO0->FIOSET = EN_CTRL;
+    delay_lcd(100);
+    LPC_GPIO0->FIOCLR = EN_CTRL;
+
+    delay_lcd(500000);
+}
+
+void delay_lcd(unsigned long r1) {
+    unsigned long r;
+
+    for (r = 0; r < r1; r++)
+        ;
+    return;
+}