add port interface header, api still to implement

fix for bug in usart.c, in function usart_write() that checked the
trasmission_empty register at the wrong time causing it to overwrite
the buffer.

1 files changed, 7 insertions, 18 deletions

diff --git a/sw/z80/kernel/pio.c b/sw/z80/kernel/pio.c
index e8c7e24..4b9caee 100644
--- a/sw/z80/kernel/pio.c
+++ b/sw/z80/kernel/pio.c
@@ -1,29 +1,18 @@
 #include "pio.h"
 
-static uint8_t *pio_port_a = (uint8_t *) ADDR_DEV_PIO;
-static uint8_t *pio_port_b = (uint8_t *) ADDR_DEV_PIO + 1;
-static uint8_t *pio_ctrl_a = (uint8_t *) ADDR_DEV_PIO + 2;
-static uint8_t *pio_ctrl_b = (uint8_t *) ADDR_DEV_PIO + 3;
+static uint8_t *pio_port = (uint8_t *) ADDR_DEV_PIO;
+static uint8_t *pio_ctrl = (uint8_t *) (ADDR_DEV_PIO + 2);
 
-void pio_data(int port, uint8_t data)
+void _pio_data(int port, uint8_t data)
 {
-    if (port == PIO_A)
-        *pio_port_a = cmd;
-    else
-        *pio_port_b = cmd;
+    *(pio_port + port) = data;
 }
 
-void pio_command(int port, uint8_t cmd)
+void _pio_command(int port, uint8_t cmd)
 {
-    if (port == PIO_A)
-        *pio_ctrl_a = cmd;
-    else
-        *pio_ctrl_b = cmd;
+    *(pio_ctrl + port) = cmd;
 }
 
-
-
-inline int pio_read_pin(int port, uint8_t pin)
+void pio_set_mode(int port, int mode)
 {
-
 }