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Ignore the PS4 packet CRC if it's not being set correctly

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This fixes handling the 8BitDo SN30 Pro with the 2.00 firmware in PS4 mode

Fixes https://github.com/libsdl-org/SDL/issues/7270

(cherry picked from commit 3951cae4a56fddcb42ce4141a6518c97fa9125cd)
This commit is contained in:
Sam Lantinga 2023-03-13 19:56:42 -07:00
parent dca3fd8307
commit 57ae9f466d
1 changed files with 13 additions and 1 deletions
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14
src/joystick/hidapi/SDL_hidapi_ps4.c
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@ -151,6 +151,7 @@ typedef struct
Uint8 led_blue;
Uint16 last_timestamp;
Uint64 timestamp;
Uint16 valid_crc_packets; /* wrapping counter */
PS4StatePacket_t last_state;
} SDL_DriverPS4_Context;
@ -1035,7 +1036,18 @@ static SDL_bool HIDAPI_DriverPS4_IsPacketValid(SDL_DriverPS4_Context *ctx, Uint8
case k_EPS4ReportIdBluetoothState8:
case k_EPS4ReportIdBluetoothState9:
/* Bluetooth state packets have two additional bytes at the beginning, the first notes if HID data is present */
if (size >= 78 && (data[1] & 0x80) && VerifyCRC(data, 78)) {
if (size >= 78 && (data[1] & 0x80)) {
if (VerifyCRC(data, 78)) {
++ctx->valid_crc_packets;
} else {
if (ctx->valid_crc_packets > 0) {
--ctx->valid_crc_packets;
}
if (ctx->valid_crc_packets >= 3) {
/* We're generally getting valid CRC, but failed one */
return SDL_FALSE;
}
}
return SDL_TRUE;
}
break;