Beginnings of 16550 code

diff --git a/ROM2/16550.c b/ROM2/16550.c
new file mode 100644 (file)
index 0000000..c29e9dd
--- /dev/null
+++ b/ROM2/16550.c
@@ -0,0 +1,6 @@
+
+#include "16550.h"
+#include "vend.h"
+
+
+

diff --git a/ROM2/16550.h b/ROM2/16550.h
new file mode 100644 (file)
index 0000000..e7e0263
--- /dev/null
+++ b/ROM2/16550.h
@@ -0,0 +1,24 @@
+#ifndef _16550_H_
+#define _16550_H_
+
+#include "vend.h"
+
+/* Must be accessed with DLAB low */
+#define UART_RX_BUF       0x00 /* read  */
+#define UART_TX_BUF       0x00 /* write */
+#define UART_INT_ENABLE   0x01
+#define UART_INT_IDENT    0x02 /* read  */
+#define UART_FIFO_CTL     0x02 /* write */
+#define UART_LINE_CTL     0x03
+#define UART_MODEM_CTL    0x04
+#define UART_LINE_STATUS  0x05
+#define UART_MODEM_STATUS 0x06
+#define UART_SCRATCH      0x07
+
+/* Same addresses as above, but accessed with DLAB high */
+#define UART_DLAB_LSB     0x00
+#define UART_DLAB_MSB     0x01
+
+extern volatile u8 _uart_regs[]; /* UART registers - fixed at link time */
+
+#endif /* _16550_H_ */

diff --git a/ROM2/Makefile b/ROM2/Makefile
index b023d7d..58e78bd 100644 (file)
--- a/ROM2/Makefile
+++ b/ROM2/Makefile
@@ -1,7 +1,8 @@
 # muchly stolen from m68hc1x's example.tar.gz's Makefile
 
 OBJS = \
-       motors.o keypad.o display_basic.o coinmech.o chime.o helpers.o server.o main_basic.o \
+       motors.o keypad.o display_basic.o coinmech.o chime.o \
+       helpers.o server.o 16550.o main_basic.o \
        vectors.o
 INCLUDES = vend.h keypad.h chime.h asm.h display_basic.h ports.h types.h
 
@@ -15,7 +16,8 @@ LDFLAGS = -m68hc11 -mshort -Wl,-m,m68hc11elfb \
          -Wl,-defsym,_misc_input=0x2000 \
          -Wl,-defsym,_home_sensors=0x2800 \
          -Wl,-defsym,_changer_output=0x3000 \
-         -Wl,-defsym,_misc_output=0x3800
+         -Wl,-defsym,_misc_output=0x3800 \
+         -Wl,-defsym,_uart_regs=0x4000
 
 OBJCOPY_FLAGS=--only-section=.text \
               --only-section=.rodata \