display & keypad work

[uccvend-snackrom.git] / ROM2 / display.c

diff --git a/ROM2/display.c b/ROM2/display.c
index 3ab045b..25edee8 100644 (file)
--- a/ROM2/display.c
+++ b/ROM2/display.c
@@ -1,26 +1,26 @@
 /*
  * 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 not scrolled.  Otherwise, the
- * message will scroll.
+ * Use set_msg(char*) to write a new message to the screen, replacing the
+ * previous one. The message can be at most 255 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 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 */
+char current_message[256];  /* message that is scrolled or switched between */
 u8   wrap_mode;             /* whether to scroll or alternate between msgs  */
+u8   scroll_point;          /* how far through the message we have scrolled */
 
 /* private prototypes */
 void display_send_byte(char c);
 void display_reset();
 void display_update();
 
-
 void set_msg(char* newmsg) {
        char* dest = current_message;
        /* equivalent of a string copy */
@@ -30,6 +30,7 @@ void set_msg(char* newmsg) {
                dest++;
                newmsg++;
        }
+       scroll_point = 0;
        display_update();
 }
 
@@ -39,10 +40,11 @@ inline void set_wrap_mode(u8 new_wrap_mode) {
 }
 
 void display_send_byte(char c) {
-       *_misc_output |= A3800_DISPLAY_WRITE;  /* enable the display clock */
+       bset_misc_output(A3800_DISPLAY_WRITE);  /* enable the display clock */
 
-       _io_ports[M6811_SPDR] = c;            /* load SPI with byte */
-       while(!(_io_ports[M6811_SPDR]&0x80)); /* wait for completion */
+       _io_ports[M6811_SPDR] = c;                  /* load SPI with byte */
+       while(!(_io_ports[M6811_SPDR]&M6811_SPIE)); /* wait for completion */
+       _io_ports[M6811_SPDR];                      /* SPDR read to clear SPIE flag */
 }
 
 #define DISPLAY_DELAY  100 /* ms to delay between ops - could be tweaked */
@@ -52,13 +54,13 @@ void display_reset() {
        delay(DISPLAY_DELAY);
        _io_ports[M6811_PORTA] |= PORTA_DISP_RESET;
 
-       _io_ports[M6811_SPCR] |= M6811_SPE;       /* enable the SPI */
+       spi_enable();
        delay(DISPLAY_DELAY);
 
-       display_send_byte(0xCA);    /* tell the controller there are 10 digits */
+       display_send_byte(0xC0 | 10);    /* tell the controller there are 10 digits */
        display_send_byte(0xE0);    /* set duty cycle to 100%                  */
 
-       _io_ports[M6811_SPCR] &= ~M6811_SPE;       /* disable the SPI again */
+       spi_disable();
 }
 
 void display_update() {