jyapayne/switch-pico
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

Emulate up to four controllers on the UART firmware

Browse source 
UART protocol v3 adds a slot byte to input frames (v2 still accepted as
slot 0) and slot-tagged BB 03 rumble frames. The regular firmware exposes
SWITCH_PICO_UART_CONTROLLERS (default 4) Switch Pro interfaces like the
AIO build. The bridge shares one serial port across controllers, maps
index:port[:slot], and demuxes rumble by slot.
This commit is contained in:
Joey Yakimowich-Payne 2026-09-22 10:25:30 -06:00
commit b6a017eb06
14 changed files with 737 additions and 411 deletions
Download patch file Download diff file Expand all files Collapse all files

42
tests/switch_pro_driver_context_test.cpp
View file

@ -681,8 +681,10 @@ void test_uart_parser_is_pure() {
packet.back() = static_cast<uint8_t>(packet.back() + packet[i]);
}
ControllerState parsed{};
expect(switch_pro_apply_uart_packet(packet.data(), packet.size(), parsed),
uint8_t slot = 0xff;
expect(switch_pro_apply_uart_packet(packet.data(), packet.size(), parsed, slot),
"valid UART packet was rejected");
expect(slot == 0, "v2 UART packet must map to slot 0");
expect(parsed.button_east && parsed.button_left_shoulder && parsed.dpad_down &&
parsed.dpad_left,
"UART buttons or hat were parsed incorrectly");
@ -707,12 +709,44 @@ void test_uart_parser_is_pure() {
ControllerState unchanged{};
unchanged.button_system = true;
unchanged.left_stick_x = 123;
uint8_t unchanged_slot = 0xff;
packet.back() ^= 0xffu;
expect(!switch_pro_apply_uart_packet(packet.data(), packet.size(),
unchanged),
unchanged, unchanged_slot),
"invalid UART checksum was accepted");
expect(unchanged.button_system && unchanged.left_stick_x == 123,
"failed UART parse modified its output reference");
expect(unchanged.button_system && unchanged.left_stick_x == 123 &&
unchanged_slot == 0xff,
"failed UART parse modified its output references");
// v3 inserts a slot byte between the length and the payload.
std::array<uint8_t, 13> slotted{};
slotted[0] = 0xaa;
slotted[1] = 0x03;
slotted[2] = 8;
slotted[3] = 2;
std::copy(packet.begin() + 3, packet.begin() + 10, slotted.begin() + 4);
for (unsigned i = 0; i < slotted.size() - 1; ++i) {
slotted.back() = static_cast<uint8_t>(slotted.back() + slotted[i]);
}
ControllerState slotted_state{};
expect(switch_pro_apply_uart_packet(slotted.data(), slotted.size(),
slotted_state, slot),
"valid v3 UART packet was rejected");
expect(slot == 2, "v3 slot byte was not reported");
expect(slotted_state.button_east && slotted_state.button_left_shoulder &&
slotted_state.dpad_down && slotted_state.dpad_left &&
slotted_state.right_stick_y ==
controller_axis_from_unsigned(0x7878),
"v3 payload offsets were parsed incorrectly");
slotted[3] = SWITCH_PICO_HID_INSTANCE_COUNT;
slotted.back() = 0;
for (unsigned i = 0; i < slotted.size() - 1; ++i) {
slotted.back() = static_cast<uint8_t>(slotted.back() + slotted[i]);
}
expect(!switch_pro_apply_uart_packet(slotted.data(), slotted.size(),
slotted_state, slot),
"out-of-range v3 slot was accepted");
}
void test_motion_backpressure_retries_without_advancing_state() {