1 files changed, 52 insertions, 0 deletions
diff --git a/sw-old/z80/drivers/include/pio.h b/sw-old/z80/drivers/include/pio.h
new file mode 100644
index 0000000..ee968d7
--- /dev/null
+++ b/sw-old/z80/drivers/include/pio.h
@@ -0,0 +1,52 @@
+#ifndef __PIO_H__
+#define __PIO_H__
+
+#include "addresses.h"
+#include <stdint.h>
+
+// DEBUG
+#define PIO_ASM_INTERFACE
+
+// ports
+#define PIO_A       0
+#define PIO_B       1
+
+// registers
+#define PIO_REG_DATA 0
+#define PIO_REG_CTRL 2
+
+#define PIO_REG_DATA_A 0    // (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_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_DISABLE         0 
+#define PIO_INT_ACTIVE_HIGH     2 
+#define PIO_INT_AND_MODE        4
+#define PIO_INT_ENABLE          8
+
+/* 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);
+
+/* the last argument is needed only for IO mode */
+void pio_set_mode(int port, int mode, uint8_t io);
+
+void pio_set_interrupts(int port, int control);
+void pio_set_interrupts_mask(int port, int control, uint8_t mask);
+
+// uint8_t pio_read_data(int port);
+uint8_t pio_read(int port);
+void pio_write(int port, uint8_t data);
+
+inline int pio_read_pin(int port, uint8_t pin);
+inline void pio_write_pin(int port, uint8_t pin);
+
+// TODO: implement mode (in/out/both) and interrupt vector
+
+#endif /* __PIO_H__ */