From 5e25bc891edf0e63e816db8ac608be690ad75a35 Mon Sep 17 00:00:00 2001
From: Rahix <rahix@rahix.de>
Date: Fri, 4 Oct 2019 13:02:30 +0200
Subject: [PATCH] feat(serial): Add function to switch serial to synchronous
In severe error conditions, asynchronous prints will never work. For
such cases we need a way to make prints happen synchronously again, the
same way it works during early boot. Add a serial_return_to_synchronous()
function which unconditionally switches the serial driver code to
synchronous mode.
Only use this function in unrecoverable error conditions!
Signed-off-by: Rahix <rahix@rahix.de>
---
epicardium/modules/modules.h | 2 ++
epicardium/modules/serial.c | 5 +++++
2 files changed, 7 insertions(+)
diff --git a/epicardium/modules/modules.h b/epicardium/modules/modules.h
index d5087864..465c78a4 100644
--- a/epicardium/modules/modules.h
+++ b/epicardium/modules/modules.h
@@ -31,6 +31,8 @@ void vSerialTask(void *pvParameters);
void serial_enqueue_char(char chr);
void serial_flush(void);
extern TaskHandle_t serial_task_id;
+/* Turn off the print queue and do prints synchroneous from now on. */
+void serial_return_to_synchronous();
// For the eSetBit xTaskNotify task semaphore trigger
enum serial_notify{
diff --git a/epicardium/modules/serial.c b/epicardium/modules/serial.c
index 396d628d..ef5b65ed 100644
--- a/epicardium/modules/serial.c
+++ b/epicardium/modules/serial.c
@@ -46,6 +46,11 @@ void serial_init()
);
}
+void serial_return_to_synchronous()
+{
+ write_stream_buffer = NULL;
+}
+
/*
* API-call to write a string. Output goes to both CDCACM and UART
*/
--
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