From fb7c1c27414cf33b1a661c83683d557f096fc7fb Mon Sep 17 00:00:00 2001
From: glitch911 <48015373+glitch911@users.noreply.github.com>
Date: Wed, 6 Apr 2022 13:52:31 +0200
Subject: [PATCH] Update uartRingBufDMA.c

if (Tail==MainBuf_SIZE) Tail = 0;
Must be apply after Tail++ (or always before but all other functions are in this way except getAfter and this could cause crash if another function is called after getAfter and Tail = MainBuf_SIZE, MainBuf[MainBuf_SIZE] crashes
---
 UART CIRCULAR BUFFER/uartRingBufDMA.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/UART CIRCULAR BUFFER/uartRingBufDMA.c b/UART CIRCULAR BUFFER/uartRingBufDMA.c
index 5c70dd9..03dcef3 100644
--- a/UART CIRCULAR BUFFER/uartRingBufDMA.c	
+++ b/UART CIRCULAR BUFFER/uartRingBufDMA.c	
@@ -259,8 +259,8 @@ int getAfter (char *string, uint8_t numberofchars, char *buffertocopyinto, uint3
 	HAL_Delay (100);
 	for (int indx=0; indx<numberofchars; indx++)
 	{
-		if (Tail==MainBuf_SIZE) Tail = 0;
 		buffertocopyinto[indx] = MainBuf[Tail++];  // save the data into the buffer... increments the tail
+		if (Tail==MainBuf_SIZE) Tail = 0;
 	}
 	return 1;
 }