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Attempts to stub in read from microcontroller, and extends command 0x06.

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A complete guess on the latter, as if you didn't know.
This commit is contained in:
Thomas Harte 2020-11-09 21:20:53 -05:00
parent 0ae49b356a
commit 7e106c6add
2 changed files with 17 additions and 3 deletions
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18
Machines/Apple/AppleIIgs/ADB.cpp
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@ -95,14 +95,12 @@ void GLU::set_command(uint8_t command) {
// Accumulate input until a full comamnd is received;
// the state machine otherwise gets somewhat oversized.
next_command_.push_back(command);
printf("ADB command: %02x\n", command);
// Command dispatch; each entry should do whatever it needs
// to do and then either: (i) break, if completed; or
// (ii) return, if awaiting further input.
#define RequireSize(n) if(next_command_.size() < (n)) return;
switch(next_command_[0]) {
// One-byte commands.
case 0x01: abort(); break;
case 0x02: reset_microcontroller(); break;
case 0x03: flush_keyboard_buffer(); break;
@ -118,7 +116,7 @@ void GLU::set_command(uint8_t command) {
break;
case 0x06: // Set configuration bytes
RequireSize(4);
RequireSize(is_rom03_ ? 8 : 4);
set_configuration_bytes(&next_command_[1]);
break;
@ -132,6 +130,11 @@ void GLU::set_command(uint8_t command) {
// TODO: what does the ROM03-paired ADB GLU do with the extra four bytes?
break;
case 0x09: // Read microcontroller memory.
RequireSize(3);
pending_response_.push_back(read_microcontroller_address(uint16_t(next_command_[1] | (next_command_[2] << 8))));
break;
case 0x0d: // Get version number.
pending_response_.push_back(6); // Seems to be what ROM03 is looking for?
break;
@ -154,6 +157,10 @@ void GLU::set_command(uint8_t command) {
}
#undef RequireSize
printf("ADB executed: ");
for(auto c : next_command_) printf("%02x ", c);
printf("\n");
// Input was dealt with, so throw it away.
next_command_.clear();
}
@ -184,3 +191,8 @@ void GLU::set_device_srq(int mask) {
// TODO: do I need to do any more than this here?
device_srq_ = mask;
}
uint8_t GLU::read_microcontroller_address(uint16_t address) {
printf("Read from microcontroller %04x\n", address);
return 0;
}

2
Machines/Apple/AppleIIgs/ADB.hpp
View File

@ -50,6 +50,8 @@ class GLU {
int device_srq_ = 0;
void set_configuration_bytes(uint8_t *);
uint8_t read_microcontroller_address(uint16_t);
};
}