crc: Add a utility to compute the CRC of a frame

The discom-crc utility computes the CRC of a frame using the same
algorithm as the DISCOM hardware block. This is useful to precompute CRC
values and then compare them with the hardware-generated values.

The utility computes the CRC on data stored in a file passed as a
command line argument. It supports two optional arguments, --crop and
--size, to specify the crop rectangle and the image size. The size only
needs to be specified if a crop rectangle is set, it is deduced from the
file size otherwise.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

1 files changed, 32 insertions, 0 deletions

diff --git a/crc/Makefile b/crc/Makefile
new file mode 100644
index 0000000..0922163
--- /dev/null
+++ b/crc/Makefile
@@ -0,0 +1,32 @@
+# SPDX-License-Identifier: CC0-1.0
+
+CROSS_COMPILE ?=
+
+CC	:= $(CROSS_COMPILE)gcc
+CFLAGS	?= -O2 -W -Wall -Wno-unused-parameter -Iinclude
+LDFLAGS	?=
+LIBS	:=
+
+OUTPUT	:= discom-crc
+OBJECTS	:= main.o
+
+%.o : %.c
+	$(CC) $(CFLAGS) -c -o $@ $<
+
+all: $(OUTPUT)
+
+$(OUTPUT): $(OBJECTS)
+	$(CC) $(LDFLAGS) -o $@ $^ $(LIBS)
+
+crc.c : gen-crc.py
+	./$< $@
+
+main.o : crc.c
+
+clean:
+	-rm -f *.o
+	-rm -f crc.c
+	-rm -f $(OUTPUT)
+
+install:
+	cp $(OUTPUT) $(INSTALL_DIR)/