5 files changed, 25 insertions, 19 deletions
diff --git a/sw/z80/drivers/include/pio.h b/sw/z80/drivers/include/pio.h
index a4b6fc2..a1137e4 100644
--- a/sw/z80/drivers/include/pio.h
+++ b/sw/z80/drivers/include/pio.h
@@ -10,23 +10,24 @@
 
 // registers
 #define PIO_REG_DATA 0
-#define PIO_REG_CTRL 1
+#define PIO_REG_CTRL 2
 
 // #define PIO_REG_DATA_A      (PIO_A + PIO_REG_PORT)
 // #define PIO_REG_DATA_B 1    (PIO_B + PIO_REG_PORT)
 // #define PIO_REG_CTRL_A 2    (PIO_A + PIO_REG_CTRL)
 // #define PIO_REG_CTRL_B 3    (PIO_B + PIO_REG_CTRL)
 
-#define PIO_MODE_BYTE_IN   0
-#define PIO_MODE_BYTE_OUT  1
-#define PIO_MODE_BYTE_BI   2
-#define PIO_MODE_BIT_IO    3
+#define PIO_MODE_BYTE_OUT  0 // mode 0
+#define PIO_MODE_BYTE_IN   1 // mode 1
+#define PIO_MODE_BYTE_BI   2 // mode 2
+#define PIO_MODE_BIT_IO    3 // mode 3
 
-#define PIO_INT_ACTIVE_HIGH     (1<<5)
-#define PIO_INT_AND_MODE        (1<<6)
-#define PIO_INT_ENABLE          (1<<7)
+#define PIO_INT_DISABLE         0 
+#define PIO_INT_ACTIVE_HIGH     2 
+#define PIO_INT_AND_MODE        4
+#define PIO_INT_ENABLE          8
 
-/* functions used internallyto interface with the device */
+/* functions used internally to interface with the device */
 inline void _pio_write(uint8_t reg, uint8_t data);
 inline uint8_t _pio_read(uint8_t reg);
 
diff --git a/sw/z80/drivers/include/usart.h b/sw/z80/drivers/include/usart.h
index bb06aab..fdc01e2 100644
--- a/sw/z80/drivers/include/usart.h
+++ b/sw/z80/drivers/include/usart.h
@@ -48,8 +48,8 @@
 #define USART_AUTOFLOW_CTS      2
 #define USART_AUTOFLOW_OFF      0
 
-typedef unsigned int    uint;
-typedef uint8_t         register_t;
+typedef unsigned int        uint;
+typedef volatile uint8_t    register_t;
 
 /* stuctures for usart registers */
 struct IER 
diff --git a/sw/z80/drivers/makefile b/sw/z80/drivers/makefile
index 98f453a..65ded58 100644
--- a/sw/z80/drivers/makefile
+++ b/sw/z80/drivers/makefile
@@ -6,15 +6,17 @@ OBJECTS := $(patsubst %.c,build/%.rel,$(SOURCES))
 
 CC := sdcc
 AR := sdar
-CFLAGS := -mz80 -Iinclude -I../arch -DDEBUG
+CFLAGS := -mz80 -Iinclude -I../arch/include -DDEBUG
 
-.PHONY: dirs clean
+.PHONY: dirs rebuild clean
 $(LIB): $(OBJECTS)
-	$(AR) rcs $@ $(OBJECTS)
+	$(AR) vrcs $@ $(OBJECTS)
 
 $(OBJECTS): build/%.rel: %.c $(SOURCES) dirs
 	$(CC) $(CFLAGS) -c $< -o $@
 
+rebuild: clean $(LIB)
+
 dirs:
 	mkdir -p build
 
diff --git a/sw/z80/drivers/pio.c b/sw/z80/drivers/pio.c
index 18697d8..272e191 100644
--- a/sw/z80/drivers/pio.c
+++ b/sw/z80/drivers/pio.c
@@ -1,6 +1,7 @@
 #include "pio.h"
 
-#if 0 /* old inline asm implementation */
+#ifdef PIO_ASM_INTERFACE
+/* old inline asm implementation */
 inline void _pio_write(uint8_t reg, uint8_t data)
 {
     __asm
@@ -17,7 +18,6 @@ inline void _pio_write(uint8_t reg, uint8_t data)
     __endasm;
 }
 
-// incomplete
 inline uint8_t _pio_read(uint8_t reg) __naked
 {
     __asm
@@ -31,7 +31,8 @@ inline uint8_t _pio_read(uint8_t reg) __naked
     ret
     __endasm;
 }
-#endif 
+
+#else
 
 inline void _pio_write(uint8_t reg, uint8_t data)
 {
@@ -43,6 +44,8 @@ inline uint8_t _pio_read(uint8_t reg)
     return *((uint8_t *) (ADDR_DEV_PIO + reg));
 }
 
+#endif
+
 void pio_set_mode(int port, int mode, uint8_t io)
 {
     // 0x0F is a control sequence to set mode
@@ -58,7 +61,7 @@ void pio_set_mode(int port, int mode, uint8_t io)
 void pio_set_interrupts(int port, int control)
 {
     // 0x07 is a control sequence to set interrupts
-    _pio_write((PIO_REG_CTRL + port), (control | 0x07));
+    _pio_write((PIO_REG_CTRL + port), (control<<4 | 0x07));
 }
 
 void pio_set_interrupts_mask(int port, int control, uint8_t mask)
diff --git a/sw/z80/drivers/usart.c b/sw/z80/drivers/usart.c
index 9ec6dbd..9a5ee38 100644
--- a/sw/z80/drivers/usart.c
+++ b/sw/z80/drivers/usart.c
@@ -1,6 +1,6 @@
 #include "usart.h"
 
-static struct _usart_device *_usart = (struct _usart_device *) ADDR_DEV_USART;
+static volatile struct _usart_device *_usart = ((struct _usart_device *) ADDR_DEV_USART);
 
 void usart_set_baudrate(uint16_t baudrate)
 {