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-rw-r--r--src/lcd.c117
1 files changed, 117 insertions, 0 deletions
diff --git a/src/lcd.c b/src/lcd.c
new file mode 100644
index 0000000..ca1c1a6
--- /dev/null
+++ b/src/lcd.c
@@ -0,0 +1,117 @@
+#include <lcd.h>
+#include <clock.h>
+#include <gpio.h>
+
+#define LCD_D0 GPIO_PORT(A, 0)
+#define LCD_D1 GPIO_PORT(A, 1)
+#define LCD_D2 GPIO_PORT(A, 4)
+#define LCD_D3 GPIO_PORT(B, 0)
+#define LCD_D4 GPIO_PORT(C, 1)
+#define LCD_D5 GPIO_PORT(C, 0)
+#define LCD_D6 GPIO_PORT(C, 2)
+#define LCD_D7 GPIO_PORT(C, 3)
+#define LCD_E GPIO_PORT(C, 12)
+#define LCD_RS GPIO_PORT(C, 10)
+
+#define lcd_data() gpio_dout(LCD_RS, 1)
+
+void lcd_pulse(void)
+{
+ gpio_dout(LCD_E, 1);
+ delay(1);
+ gpio_dout(LCD_E, 0);
+}
+
+void lcd_byte(uint8_t byte)
+{
+ gpio_dout(LCD_D0, byte & 0x01);
+ gpio_dout(LCD_D1, byte & 0x02);
+ gpio_dout(LCD_D2, byte & 0x04);
+ gpio_dout(LCD_D3, byte & 0x08);
+ gpio_dout(LCD_D4, byte & 0x10);
+ gpio_dout(LCD_D5, byte & 0x20);
+ gpio_dout(LCD_D6, byte & 0x40);
+ gpio_dout(LCD_D7, byte & 0x80);
+}
+
+void lcd_cmd(uint8_t cmd)
+{
+ gpio_dout(LCD_RS, 0);
+ lcd_byte(cmd);
+ lcd_pulse();
+}
+
+void lcd_putchar(int c)
+{
+ lcd_data();
+ lcd_byte((uint8_t)c);
+ lcd_pulse();
+}
+
+static int lcd_index = 0;
+void lcd_puts(const char *s)
+{
+ lcd_cmd(0x06);
+ while (*s) {
+ lcd_putchar(*s++);
+ if (++lcd_index == 0x10) {
+ lcd_cmd(0x80 | 0x40);
+ } else if (lcd_index == 0x20) {
+ lcd_cmd(0x80);
+ lcd_index = 0;
+ }
+ }
+}
+
+extern char *itoa(int n, int base);
+void lcd_puti(int i)
+{
+ lcd_puts(itoa(i, 10));
+}
+
+void lcd_puth(int h)
+{
+ lcd_puts(itoa(h, 16));
+}
+
+void lcd_putb(uint8_t b)
+{
+ lcd_puts(itoa(b, 2));
+}
+
+void lcd_clear(void)
+{
+ lcd_cmd(0x01);
+ delay(2);
+ lcd_index = 0;
+}
+
+void lcd_init(void)
+{
+ gpio_mode(LCD_D0, OUTPUT);
+ gpio_mode(LCD_D1, OUTPUT);
+ gpio_mode(LCD_D2, OUTPUT);
+ gpio_mode(LCD_D3, OUTPUT);
+ gpio_mode(LCD_D4, OUTPUT);
+ gpio_mode(LCD_D5, OUTPUT);
+ gpio_mode(LCD_D6, OUTPUT);
+ gpio_mode(LCD_D7, OUTPUT);
+ gpio_mode(LCD_E, OUTPUT);
+ gpio_mode(LCD_RS, OUTPUT);
+ gpio_dout(LCD_D0, 0);
+ gpio_dout(LCD_D1, 0);
+ gpio_dout(LCD_D2, 0);
+ gpio_dout(LCD_D3, 0);
+ gpio_dout(LCD_D4, 0);
+ gpio_dout(LCD_D5, 0);
+ gpio_dout(LCD_D6, 0);
+ gpio_dout(LCD_D7, 0);
+ gpio_dout(LCD_E, 0);
+ gpio_dout(LCD_RS, 0);
+
+ lcd_cmd(0x38);
+ lcd_cmd(0x10);
+ lcd_cmd(0x0D);
+ delay(5);
+ lcd_clear();
+}