From 3f230283dabfc02115912819ab94226cf26cc019 Mon Sep 17 00:00:00 2001 From: Rasmus Date: Thu, 10 Sep 2026 06:11:44 +0200 Subject: [PATCH] rfid: lower MFRC522 SPI clock to 2 MHz for clone-reader self-test stability --- main/rfid_manager.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/main/rfid_manager.c b/main/rfid_manager.c index 014e7ed..e47b585 100644 --- a/main/rfid_manager.c +++ b/main/rfid_manager.c @@ -22,8 +22,9 @@ static const char *TAG = "rfid"; #define RC522_TASK_PRIORITY (4) /* Conservative clock for MFRC522 clones. If the FIFO self-test still - * reports a mismatch at boot, lower this (e.g. 2000000) or check power. */ -#define RC522_SPI_CLK_HZ (4000000) + * reports a mismatch at boot, lower this further (e.g. 1000000) or check + * power/wiring. Many clone readers glitch at 4MHz on a shared bus. */ +#define RC522_SPI_CLK_HZ (2000000) #define RC522_START_ATTEMPTS (3) static rc522_driver_handle_t s_driver;