stm32: crc-v2: STM32F0/3 extended crc unit

Implementation of extended crc unit in f0 and f3

lib/stm32/common/crc_v2.c

@@ -0,0 +1,115 @@
+/** @addtogroup crc_defines
+
+ @author @htmlonly &copy; @endhtmlonly 2016 Cem Basoglu <cem.basoglu@web.de>
+
+ */
+
+/*
+ * This file is part of the libopencm3 project.
+ *
+ * Copyright (C) 2016 Cem Basoglu <cem.basoglu@web.de>
+ *
+ * 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 <http://www.gnu.org/licenses/>.
+ */
+
+
+/**@{*/
+
+#include <libopencm3/stm32/crc.h>
+
+/*---------------------------------------------------------------------------*/
+/** @brief Enable reverse output data.
+
+ Enables the reversal of the bit order of the output data.
+
+ */
+void crc_reverse_output_enable()
+{
+	CRC_CR |= CRC_CR_REV_OUT;
+}
+
+/*---------------------------------------------------------------------------*/
+/** @brief Disable reverse output data.
+
+ Disables the reversal of the bit order of the output data.
+
+ */
+void crc_reverse_output_disable()
+{
+	CRC_CR &= ~CRC_CR_REV_OUT;
+}
+
+/*---------------------------------------------------------------------------*/
+/** @brief Reverse input data.
+
+ Controls the reversal of the bit order of the input data
+
+ @param[in] reverse_in Unsigned int32. Reversal bit order @ref crc_rev_in.
+ */
+void crc_set_reverse_input(uint32_t reverse_in)
+{
+	uint32_t reg32 = CRC_CR;
+	reg32 = (reg32 & ~CRC_CR_REV_IN) | reverse_in;
+	CRC_CR = reg32;
+}
+
+/*---------------------------------------------------------------------------*/
+/** @brief Polynomial size
+
+ Set the size of the polynomial.
+
+ @param[in] polysize Unsigned int32. Size of polynomial @ref crc_polysize.
+ */
+void crc_set_polysize(uint32_t polysize)
+{
+	uint32_t reg32 = CRC_CR;
+	reg32 = (reg32 & ~CRC_CR_POLYSIZE) | polysize;
+	CRC_CR = reg32;
+}
+
+/*---------------------------------------------------------------------------*/
+/** @brief Polynomial coefficient
+
+ Set the coefficients of the polynomial to be used for CRC calculation.
+ If the polynomial size is less than 32-bits, the least significant bits
+ have to be used to program the correct value.
+
+ @note To obtain a reliable CRC calculation, any changes to the polynomial
+ value or size can not be performed during a CRC calculation.
+ As a result, if a CRC calculation is ongoing, the application must either
+ reset the crc unit it or perform a CRC_DR read before changing the polynomial.
+
+ @note The default polynomial value is the CRC-32 (Ethernet) polynomial: 0x4C11DB7.
+
+ @param[in] polynomial Unsigned int32. Polynomial coefficient.
+ */
+void crc_set_polynomial(uint32_t polynomial)
+{
+	CRC_POL = polynomial;
+}
+
+/*---------------------------------------------------------------------------*/
+/** @brief CRC Initial value.
+
+Sets the crc initial value.
+
+ @param[in] initial Unsigned int32. CRC initial value.
+ */
+void crc_set_initial(uint32_t initial)
+{
+	CRC_INIT = initial;
+}
+
+/**@}*/
+

lib/stm32/f0/Makefile

@@ -39,7 +39,7 @@ ARFLAGS		= rcs
 OBJS		= can.o flash.o rcc.o usart.o dma.o rtc.o comparator.o crc.o \
                   dac.o iwdg.o pwr.o gpio.o timer.o adc.o desig.o
 
-OBJS            += gpio_common_all.o gpio_common_f0234.o crc_common_all.o \
+OBJS            += gpio_common_all.o gpio_common_f0234.o crc_common_all.o crc_v2.o \
                    pwr_common_v1.o iwdg_common_all.o rtc_common_l1f024.o \
                    dma_common_l1f013.o exti_common_all.o spi_common_all.o \
 		   spi_common_f03.o flash_common_f01.o dac_common_all.o \

lib/stm32/f3/Makefile

@@ -40,7 +40,7 @@ ARFLAGS		= rcs
 OBJS		= rcc.o adc.o can.o pwr.o usart.o dma.o flash.o desig.o
 
 OBJS            += gpio_common_all.o gpio_common_f0234.o \
-		   dac_common_all.o crc_common_all.o \
+		   dac_common_all.o crc_common_all.o crc_v2.o \
 		   iwdg_common_all.o pwr_common_v1.o spi_common_all.o dma_common_l1f013.o\
 		   timer_common_all.o timer_common_f0234.o flash_common_f234.o \
 		   flash.o exti_common_all.o rcc_common_all.o spi_common_f03.o