+/*
+ * display.c - functions for controlling the display on the vending machine.
+ *
+ * Use set_msg(char*) to write a new message to the screen, replacing the previous
+ * one. The message can be at most 1023 characters long. Use set_wrap_mode with
+ * one of the WRAP_* options in vend.h to set the scrolling behaviour. If the
+ * message is less than 10 characters, it is centered and is not scrolled.
+ * Otherwise, the message will scroll.
+ *
+ */
+
+
+#include "vend.h"
+
+char display_buffer[10]; /* what each byte on the display reads */
+char current_message[1024]; /* message that is scrolled or switched between */
+u8 wrap_mode; /* whether to scroll or alternate between msgs */
+
+void set_msg(char* newmsg) {
+ char* dest = current_message;
+ /* while (dest++ = newmsg++); */
+ while (newmsg) {
+ dest = newmsg;
+ dest++;
+ newmsg++;
+ }
+}
+
+void __inline__ set_wrap_mode(u8 new_wrap_mode) {
+ /* in theory it should be inlined anyway? */
+ wrap_mode = new_wrap_mode;
+}
+
+void display_send_byte(u8 b) {
+ bset_3800(A3800_DISPLAY_WRITE);
+}
+
+#define DISPLAY_DELAY 100 /* ms to delay between ops - could be tweaked */
+void display_reset() {
+ /* lower the reset line for 100ms */
+ bclr(PORTA, PORTA_DISP_RESET);
+ delay(DISPLAY_DELAY);
+ bset(PORTA, PORTA_DISP_RESET);
+
+ /* enable the SPI */
+ bset(SPCR, SPCR_SPE);
+ delay(DISPLAY_DELAY);
+
+ /* tell the controller there are 10 digits */
+
+}
+
+void display_refresh() {
+ display_reset();
+}