+/*
+ * display_basic.c - simple functions for writing to the screen of the vendie.
+ *
+ * Use set_msg(char[10]) to write a new message to the screen, replacing the
+ * previous one.
+ *
+ */
+
+#include "display_basic.h"
+#include "vend.h"
+
+/* private prototypes */
+void display_send_byte(char c);
+void display_reset();
+
+void set_msg(char newmsg[10]) {
+ int i;
+ display_reset();
+ for (i=0; i < 10; i++) {
+ display_send_byte(newmsg[i]&0x7f);
+ }
+}
+
+void display_send_byte(char c) {
+ bset_misc_output(A3800_DISPLAY_WRITE); /* enable the display clock */
+
+ _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 */
+void display_reset() {
+ /* lower the reset line for a while */
+ bclr((void*)&_io_ports[M6811_PORTA], PORTA_DISP_RESET);
+ delay(DISPLAY_DELAY);
+ bset((void*)&_io_ports[M6811_PORTA], PORTA_DISP_RESET);
+
+ spi_enable();
+ delay(DISPLAY_DELAY);
+
+ display_send_byte(0xC0 | 10); /* tell the controller there are 10 digits */
+ display_send_byte(0xE0); /* set duty cycle to 100% */
+
+ spi_disable();
+}
+
+void display_init() {
+ display_reset();
+}
+