From 229d8b64ea9f88ba619bd4ac2e5fa7570f61bece Mon Sep 17 00:00:00 2001
From: Jacek Fedorynski <jfedor@jfedor.org>
Date: Sun, 8 Dec 2024 01:29:15 +0100
Subject: [PATCH] Fallback SOF timer

Setup a timer to call manual_sof() again after 1050us in case we stop
getting SOFs from host.
---
 firmware/src/remapper_single.cc | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/firmware/src/remapper_single.cc b/firmware/src/remapper_single.cc
index 09dd535..e6966dc 100644
--- a/firmware/src/remapper_single.cc
+++ b/firmware/src/remapper_single.cc
@@ -123,7 +123,14 @@ void send_out_report() {
     do_send_out_report();
 }
 
+static alarm_id_t fallback_sof_alarm = 0;
+
 static int64_t __no_inline_not_in_flash_func(manual_sof)(alarm_id_t id, void* user_data) {
+    if (fallback_sof_alarm) {
+        cancel_alarm(fallback_sof_alarm);
+    }
+    fallback_sof_alarm = add_alarm_in_us(1050, manual_sof, NULL, false);
+
     pio_usb_host_frame();
     set_tick_pending();
     return 0;