From 450c3e00a16c3d8bf1a9282d2ca4b45e8b4d9045 Mon Sep 17 00:00:00 2001 From: Karl Palsson Date: Mon, 18 Jun 2012 18:57:45 +0000 Subject: Basic helper routines for CRC Note, the CRC block is pretty useless for interoperability. It only operates on 32bit chunks, and in a different bit order. No attempt to make full helpers for compatibility with other implementations has been done. https://my.st.com/public/STe2ecommunities/mcu/Lists/cortex_mx_stm32/Flat.aspx?RootFolder=%2Fpublic%2FSTe2ecommunities%2Fmcu%2FLists%2Fcortex_mx_stm32%2FCRC%20computation&FolderCTID=0x01200200770978C69A1141439FE559EB459D7580009C4E14902C3CDE46A77F0FFD06506F5B¤tviews=2006 --- lib/stm32/crc.c | 44 ++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 44 insertions(+) create mode 100644 lib/stm32/crc.c (limited to 'lib/stm32/crc.c') diff --git a/lib/stm32/crc.c b/lib/stm32/crc.c new file mode 100644 index 0000000..bbbe1fd --- /dev/null +++ b/lib/stm32/crc.c @@ -0,0 +1,44 @@ +/* + * This file is part of the libopencm3 project. + * + * Copyright (C) 2012 Karl Palsson + * + * This library is free software: you can redistribute it and/or modify + * it under the terms of the GNU Lesser General Public License as published by + * the Free Software Foundation, either version 3 of the License, or + * (at your option) any later version. + * + * This library is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public License + * along with this library. If not, see . + */ + +#include + +void crc_reset(void) +{ + CRC_CR |= CRC_CR_RESET; +} + +u32 crc_calculate(u32 data) +{ + CRC_DR = data; + // Data sheet says this blocks until it's ready.... + return CRC_DR; +} + +u32 crc_calculate_block(u32 *datap, int size) +{ + int i; + for (i = 0; i < size; i++) { + CRC_DR = datap[i]; + } + return CRC_DR; +} + + + -- cgit v1.2.3