cn0534: automate build and code cleanup

Signed-off-by: Trecia Agoylo <[email protected]>

cn0534/README.md

@@ -5,7 +5,7 @@ The main script is based on the `power_check.c` script found on the [plutosdr_sc
 
 Running first the build script is necessary. Prior to running, set the build environment first in the `./build_arm.sh`, change the CC_DIR to the path of the bin folder of the compiler.
 
-For Linux, with the cross compiler set on the host pc and linked with the sysroot used by the pluto, run `./build_arm.sh`. The sysroot used should match to the firmware of pluto. As of this writing, pluto firmware v0.30 is used. The sysroot folder should be in the same directory as the `./build_arm.sh`. Also, updating Pluto to AD9364 frequency range is necessary to accommodate CN0534 frequency range.
+For Linux, with the cross compiler set on the host pc and linked with the sysroot used by the pluto, run `./build_arm.sh`. The sysroot used should match to the firmware of pluto. As of this writing, pluto firmware v0.30 is used. The sysroot folder should be in the same directory as the `./build_arm.sh`. Also, [updating Pluto to AD9364 frequency range](https://wiki.analog.com/university/tools/pluto/users/customizing#updating_to_the_ad9364) is necessary to accommodate CN0534 frequency range.
 
 ![Build Folder Structure](images/build_folder_structure.png)
 

cn0534/build_arm.sh

@@ -1,4 +1,30 @@
 #!/bin/sh
 ROOTFS=$(pwd)/pluto-0.30.sysroot
-CC_DIR=/home/guest/linux_dev/gcc-arm-8.3-2019.03-x86_64-arm-linux-gnueabihf/bin
-make CC=$CC_DIR/arm-linux-gnueabihf-gcc CFLAGS="-mfloat-abi=hard  --sysroot=${ROOTFS} -I./include -L${ROOTFS}/lib"
+CROSS_COMPILE="$3"
+HOST=${HOST:-x86_64}
+GCC_ARCH=arm-linux-gnueabihf
+
+[ -n "$CROSS_COMPILE" ] || {
+	CROSS_COMPILE=${GCC_ARCH}-gcc
+	if type "${GCC_ARCH}-gcc" >/dev/null 2>&1 ; then
+		CROSS_COMPILE="${GCC_ARCH}-"
+	else
+		GCC_VERSION="8.3-2019.03"
+		GCC_DIR="gcc-arm-${GCC_VERSION}-${HOST}-${GCC_ARCH}"
+		GCC_TAR="$GCC_DIR.tar.xz"
+		GCC_URL="https://developer.arm.com/-/media/Files/downloads/gnu-a/${GCC_VERSION}/binrel/${GCC_TAR}"
+		if [ ! -d "$GCC_DIR" ] && [ ! -e "$GCC_TAR" ] ; then
+			wget "$GCC_URL"
+		fi
+		if [ ! -d "$GCC_DIR" ] ; then
+			tar -xvf $GCC_TAR || {
+				echo "'$GCC_TAR' seems invalid ; remove it and re-download it"
+				exit 1
+			}
+		fi
+		CROSS_COMPILE=$(pwd)/$GCC_DIR/bin/${GCC_ARCH}-gcc
+	fi
+}
+
+
+make CC=$CROSS_COMPILE CFLAGS="-mfloat-abi=hard  --sysroot=${ROOTFS} -I./include -L${ROOTFS}/lib"

cn0534/src/power_check.c

@@ -407,20 +407,6 @@ static int32_t iio_set_attribute(char *device, char *channel, bool in_out,
         return EXIT_FAILURE;
     }
 
-    ret = iio_channel_attr_read(chan, attribute, buf, sizeof(buf));
-    if (ret > 0)
-    {
-        /*if (log)
-        {
-            write_log[wl_index].device = strdup(device);
-            write_log[wl_index].channel = strdup(channel);
-            write_log[wl_index].in_out = in_out;
-            write_log[wl_index].attribute = strdup(attribute);
-            write_log[wl_index].value = strdup(buf);
-            wl_index++;
-        }*/
-    }
-
     if (buffer)
     {
         ret = iio_channel_attr_write(chan, attribute, buffer);