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Adds a helper for decoding ADB commands.

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Still very noticeably to do: any sort of standard part for devices to respond to the bus.
This commit is contained in:
Thomas Harte 2021-02-10 21:39:33 -05:00
parent 6ca8aa99fc
commit 33abdc95aa
1 changed files with 36 additions and 0 deletions
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36
Machines/Apple/ADB/Bus.hpp
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@ -18,6 +18,42 @@
namespace Apple { namespace Apple {
namespace ADB { namespace ADB {
struct Command {
enum class Type {
Reset,
Flush,
Reserved,
Listen,
Talk
};
const Type type = Type::Reserved;
const uint8_t device = 0xff;
const uint8_t reg = 0xff;
Command() {}
Command(Type type) : type(type) {}
Command(Type type, uint8_t device) : type(type), device(device) {}
Command(Type type, uint8_t device, uint8_t reg) : type(type), device(device), reg(reg) {}
};
/*!
@returns The @c Command encoded in @c code.
*/
inline Command decode_command(uint8_t code) {
switch(code & 0x0f) {
default: return Command();
case 0: return Command(Command::Type::Reset);
case 1: return Command(Command::Type::Flush, code >> 4);
case 8: case 9: case 10: case 11:
return Command(Command::Type::Listen, code >> 4, code & 3);
case 12: case 13: case 14: case 15:
return Command(Command::Type::Talk, code >> 4, code & 3);
}
}
/*! /*!
The ADB bus models the data line of the ADB bus; it allows multiple devices to The ADB bus models the data line of the ADB bus; it allows multiple devices to
post their current data level, or read the current level, and also offers a tokenised post their current data level, or read the current level, and also offers a tokenised