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@@ -57,12 +57,13 @@ static inline void place_bit1(void); |
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static inline void send_byte(uint8_t data); |
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static inline bool read_bit(void); |
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static inline uint8_t read_byte(void); |
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static inline uint8_t wait_data_lo(uint8_t us); |
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static inline uint8_t wait_data_lo(uint16_t us); |
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static inline uint8_t wait_data_hi(uint8_t us); |
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void adb_host_init(void) |
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{ |
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DDRF |= (1<<1); |
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data_hi(); |
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#ifdef ADB_PSW_BIT |
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psw_hi(); |
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@@ -88,19 +89,24 @@ uint16_t adb_host_kbd_recv(void) |
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attention(); |
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send_byte(0x2C); // Addr:Keyboard(0010), Cmd:Talk(11), Register0(00) |
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place_bit0(); // Stopbit(0) |
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if (!wait_data_lo(0xFF)) // Tlt/Stop to Start(140-260us) |
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if (!wait_data_lo(500)) { // Tlt/Stop to Start(140-260us) |
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return 0; // No data to send |
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if (!read_bit()) // Startbit(1) |
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} |
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if (!read_bit()) { // Startbit(1) |
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// Service Request |
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return -2; |
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} |
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// ad hoc fix: without block inerrupt read wrong bit occasionally and get keys stuck |
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cli(); |
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data = read_byte(); |
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data = (data<<8) | read_byte(); |
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uint8_t stop = read_bit(); // Stopbit(0) |
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sei(); |
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if (read_bit()) // Stopbit(0) |
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if (stop) { |
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return -3; |
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} |
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return data; |
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} |
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@@ -255,7 +261,7 @@ static inline uint8_t read_byte(void) |
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return data; |
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} |
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static inline uint8_t wait_data_lo(uint8_t us) |
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static inline uint8_t wait_data_lo(uint16_t us) |
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{ |
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while (data_in() && us) { |
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_delay_us(1); |
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@@ -282,6 +288,9 @@ Resources |
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--------- |
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ADB - The Untold Story: Space Aliens Ate My Mouse |
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http://developer.apple.com/legacy/mac/library/#technotes/hw/hw_01.html |
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ADB Manager |
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http://developer.apple.com/legacy/mac/library/documentation/mac/pdf/Devices/ADB_Manager.pdf |
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Service request(5-17) |
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Apple IIgs Hardware Reference Second Edition [Chapter6 p121] |
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ftp://ftp.apple.asimov.net/pub/apple_II/documentation/Apple%20IIgs%20Hardware%20Reference.pdf |
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ADB Keycode |