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Fix SPI bus contention crash on serial game upload

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Serial uploader was crashing the Pico when launching games because
it accessed SD card (SPI) while Core 1 was refreshing display (also SPI).
Display and SD card share the same SPI bus and cannot be accessed
simultaneously.

Split game launch into prepare and execute phases:
- prepare: Re-scan games directory (safe, SD access done immediately)
- execute: Load Lua script from SD (deferred until display is idle)

Main loop now checks !is_refresh_in_progress() before completing
launch, preventing SPI conflicts.

Also updated SD card best practices skill to document SPI bus
contention as the #1 most critical issue to avoid.

Co-Authored-By: Claude <noreply@anthropic.com>
This commit is contained in:
Adolfo Reyna
2026-02-12 23:25:31 -05:00
parent f8fb04db1b
commit 518bc054c4
5 changed files with 158 additions and 24 deletions
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10
games/lua_examples/2048.lua
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@@ -49,7 +49,7 @@ function init()
game.vars.won = false
-- Enable continuous updates
game.set_frame_updates(true)
-- game.set_frame_updates(true)
print("2048 initialized")
end
@@ -124,7 +124,7 @@ function draw()
if state == STATE_MENU then
renderer.text_scaled(game.width() / 2 - 15, game.height() / 2 - 30, "2048", true, 2)
renderer.text_scaled(game.width() / 2 - 50, game.height() / 2, "Tap to Start", true, 2)
renderer.text_scaled(game.width() / 2 - 50, game.height() / 2 + 30, "Welcome Adolfo2!", true, 2)
renderer.text_scaled(game.width() / 2 - 50, game.height() / 2 + 30, "Welcome Adolfo", true, 2)
elseif state == STATE_PLAYING or state == STATE_WIN or state == STATE_GAME_OVER then
-- Draw grid
@@ -159,10 +159,10 @@ function draw()
-- Draw value (simplified)
local text = tostring(value)
if string.len(text) <= 2 then
renderer.text_scaled(tile_x + tile_size / 2 - 4, tile_y + tile_size / 2 - 4, text, false, 2)
if string.len(text) < 2 then
renderer.text_scaled(tile_x + tile_size / 2 - 4, tile_y + tile_size / 2 - 8, text, false, 2)
else
renderer.text_scaled(tile_x + tile_size / 2 - 8, tile_y + tile_size / 2 - 4, text, false, 2)
renderer.text_scaled(tile_x + tile_size / 2 - 12, tile_y + tile_size / 2 - 8, text, false, 2)
end
end
end