#include <avr/io.h>
#include <avr/interrupt.h>
#include "adb.h"
+#include "debug.h"
static inline void data_lo(void);
static inline void send_byte(uint8_t data);
static inline bool read_bit(void);
static inline uint8_t read_byte(void);
-static inline uint8_t wait_data_lo(uint8_t us);
+static inline uint8_t wait_data_lo(uint16_t us);
static inline uint8_t wait_data_hi(uint8_t us);
}
#endif
+/*
+ * Don't call this in a row without the delay, otherwise it makes some of poor controllers
+ * overloaded and misses strokes. Recommended delay is 16ms.
+ *
+ * Thanks a lot, blargg! <http://geekhack.org/index.php?topic=14290.msg1068919#msg1068919>
+ */
uint16_t adb_host_kbd_recv(void)
{
uint16_t data = 0;
attention();
send_byte(0x2C); // Addr:Keyboard(0010), Cmd:Talk(11), Register0(00)
place_bit0(); // Stopbit(0)
- if (!wait_data_lo(0xFF)) // Tlt/Stop to Start(140-260us)
+ if (!wait_data_lo(500)) { // Tlt/Stop to Start(140-260us)
return 0; // No data to send
- if (!read_bit()) // Startbit(1)
+ }
+ if (!read_bit()) { // Startbit(1)
+ // Service Request
+ dprintf("Startbit ERROR\n");
return -2;
+ }
// ad hoc fix: without block inerrupt read wrong bit occasionally and get keys stuck
cli();
data = read_byte();
data = (data<<8) | read_byte();
+ uint8_t stop = read_bit(); // Stopbit(0)
sei();
- if (read_bit()) // Stopbit(0)
+ if (stop) {
+ dprintf("Stopbit ERROR\n");
return -3;
+ }
return data;
}
return data;
}
-static inline uint8_t wait_data_lo(uint8_t us)
+static inline uint8_t wait_data_lo(uint16_t us)
{
while (data_in() && us) {
_delay_us(1);
---------
ADB - The Untold Story: Space Aliens Ate My Mouse
http://developer.apple.com/legacy/mac/library/#technotes/hw/hw_01.html
+ADB Manager
+ http://developer.apple.com/legacy/mac/library/documentation/mac/pdf/Devices/ADB_Manager.pdf
+ Service request(5-17)
Apple IIgs Hardware Reference Second Edition [Chapter6 p121]
ftp://ftp.apple.asimov.net/pub/apple_II/documentation/Apple%20IIgs%20Hardware%20Reference.pdf
ADB Keycode