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Fix ADB protocol issue #14

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This commit is contained in:
tmk 2013-04-09 14:04:36 +09:00
commit 46d412d262
1 changed files with 14 additions and 5 deletions
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19
protocol/adb.c
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@ -57,12 +57,13 @@ static inline void place_bit1(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);
void adb_host_init(void)
{
DDRF |= (1<<1);
data_hi();
#ifdef ADB_PSW_BIT
psw_hi();
@ -88,19 +89,24 @@ uint16_t adb_host_kbd_recv(void)
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
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) {
return -3;
}
return data;
}
@ -255,7 +261,7 @@ static inline uint8_t read_byte(void)
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);
@ -282,6 +288,9 @@ Resources
---------
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