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Adding a random wait to avoid different GBAs getting stuck

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This commit is contained in:
Rodrigo Alfonso
2024-08-22 07:28:51 -03:00
parent f670e3d2bf
commit 0ae110f111
2 changed files with 15 additions and 6 deletions
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2
README.md
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@@ -123,8 +123,6 @@ Name | Return type | Description
--- | --- | ---
`sendRom(rom, romSize, cancel, [mode])` | **LinkCableMultiboot::Result** | Sends the `rom`. During the handshake process, the library will continuously invoke `cancel`, and abort the transfer if it returns `true`. The `romSize` must be a number between `448` and `262144`, and a multiple of `16`. The `mode` can be either `LinkCableMultiboot::TransferMode::MULTI_PLAY` for GBA cable (default value) or `LinkCableMultiboot::TransferMode::SPI` for GBC cable. Once completed, the return value should be `LinkCableMultiboot::Result::SUCCESS`.
⚠️ for better results, turn on the GBAs **after** calling the `sendRom` method!
⚠️ stop DMA before sending the ROM! _(you might need to stop your audio player)_
# 🔧👾 LinkRawCable

19
lib/LinkCableMultiboot.hpp
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@@ -20,7 +20,6 @@
// // `result` should be LinkCableMultiboot::Result::SUCCESS
// --------------------------------------------------------------------------
// considerations:
// - for better results, turn on the GBAs after calling the `sendRom` method!
// - stop DMA before sending the ROM! (you might need to stop your audio player)
// --------------------------------------------------------------------------
@@ -57,7 +56,7 @@ class LinkCableMultiboot {
static constexpr int MIN_ROM_SIZE = 0x100 + 0xc0;
static constexpr int MAX_ROM_SIZE = 256 * 1024;
static constexpr int FRAME_LINES = 228;
static constexpr int WAIT_BEFORE_RETRY = (FRAME_LINES * 60) / 16;
static constexpr int WAIT_BEFORE_RETRY = FRAME_LINES * 4;
static constexpr int DETECTION_TRIES = 16;
static constexpr int CLIENTS = 3;
static constexpr int CLIENT_NO_DATA = 0xff;
@@ -112,7 +111,9 @@ class LinkCableMultiboot {
retry:
deactivate();
wait(WAIT_BEFORE_RETRY);
// (*) instead of 1/16s, waiting a random number of frames works better
wait(WAIT_BEFORE_RETRY + FRAME_LINES * _qran_range(1, 30));
// 1. Prepare a "Multiboot Parameter Structure" in RAM.
PartialResult partialResult = NEEDS_RETRY;
@@ -153,6 +154,7 @@ class LinkCableMultiboot {
LinkRawCable* linkRawCable = new LinkRawCable();
LinkSPI* linkSPI = new LinkSPI();
TransferMode _mode;
int randomSeed = 123;
enum PartialResult { NEEDS_RETRY, FINISHED, ABORTED };
@@ -169,7 +171,7 @@ class LinkCableMultiboot {
// 3. Send the word 0x6200 repeatedly until all detected clients respond
// with 0x720X, where X is their client number (1-3). If they fail to do
// this after 16 tries, delay 1/16s and go back to step 2.
// this after 16 tries, delay 1/16s and go back to step 2. (*)
bool success = false;
for (u32 t = 0; t < DETECTION_TRIES; t++) {
auto response = transfer(HANDSHAKE, cancel);
@@ -366,6 +368,15 @@ class LinkCableMultiboot {
}
};
}
int _qran() {
randomSeed = 1664525 * randomSeed + 1013904223;
return (randomSeed >> 16) & 0x7FFF;
}
int _qran_range(int min, int max) {
return (_qran() * (max - min) >> 15) + min;
}
};
extern LinkCableMultiboot* linkCableMultiboot;