From: sjlongland <sjlongland@01035d8c-6547-0410-b346-abe4f91aad63>
Date: Sun, 27 Sep 2015 00:03:20 +0000 (+0000)
Subject: stm32f4_vrom: Do checksum on copy of block.
X-Git-Url: http://git.whiteaudio.com/gitweb/?a=commitdiff_plain;h=a646b0b8e8af64ebd504647a7e69444d4aa65117;p=freetel-svn-tracking.git

stm32f4_vrom: Do checksum on copy of block.

Store a temporary copy of the block on the stack to do our checksumming
on.  This allows us to zero out the CRC32 field.

(There is a way to include the CRC32 field in the checksum itself, but
haven't figured out the mathematics needed yet.)

git-svn-id: https://svn.code.sf.net/p/freetel/code@2400 01035d8c-6547-0410-b346-abe4f91aad63
---

diff --git a/codec2-dev/stm32/src/stm32f4_vrom.c b/codec2-dev/stm32/src/stm32f4_vrom.c
index adc400b2..987211f2 100644
--- a/codec2-dev/stm32/src/stm32f4_vrom.c
+++ b/codec2-dev/stm32/src/stm32f4_vrom.c
@@ -159,10 +159,14 @@ static const struct vrom_data_block_t* vrom_get_block(
 static uint32_t vrom_crc32(
 		const struct vrom_data_block_t* const block)
 {
+	struct vrom_data_block_t temp_block;
+	uint32_t size = sizeof(temp_block);
+	const uint8_t* in = (const uint8_t*)(&temp_block);
 	uint32_t tmp;
 	uint32_t crc;
-	uint32_t size = VROM_BLOCK_SZ - sizeof(uint32_t);
-	const uint8_t* in = (const uint8_t*)(&(block->header.rom));
+
+	memcpy(&temp_block, block, sizeof(temp_block));
+	temp_block.header.crc32 = 0;
 
 	CRC_ResetDR();
 	while(size) {