/*
* 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 */
dest++;
newmsg++;
}
+ scroll_point = 0;
display_update();
}
}
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 */
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() {