tools/esp32: Refine the QEMU image generation.

Use the usual while loop idiom when parsing arguments.
Add more options to the script to be able to specify the name of the
NuttX binary and final image.

Signed-off-by: Abdelatif Guettouche <abdelatif.guettouche@espressif.com>

tools/esp32/Config.mk

@@ -42,7 +42,7 @@ else ifeq ($(CONFIG_ESP32_FLASH_16M),y)
 endif
 
 ifeq ($(CONFIG_ESP32_QEMU_IMAGE),y)
-	MK_QEMU_IMG=$(TOPDIR)/tools/esp32/mk_qemu_img.sh $(BOOTLOADER) $(PARTITION_TABLE)
+	MK_QEMU_IMG=$(TOPDIR)/tools/esp32/mk_qemu_img.sh -b $(BOOTLOADER) -p $(PARTITION_TABLE)
 else
 	MK_QEMU_IMG=
 endif

tools/esp32/mk_qemu_img.sh

@@ -20,35 +20,78 @@
 ############################################################################
 
 SCRIPT_NAME=$(basename "${0}")
-USAGE="USAGE: ${SCRIPT_NAME} <bootloader_img> <partition_table_img>"
+
+BOOTLOADER_IMG=""
+PARTITION_IMG=""
+NUTTX_IMG="nuttx.bin"
+FLASH_IMG="esp32_qemu_img.bin"
+
+usage() {
+  echo ""
+  echo "USAGE: ${SCRIPT_NAME} [-h] -b <bootloader> -p <partition_table> [-n <nuttx>] [-i <image_name>]"
+  echo ""
+  echo "Where:"
+  echo "  -b <bootloader> path to the bootloader image"
+  echo "  -p <partition_table> path to the partition table image"
+  echo "  -n <nuttx> path to the nuttx image (default nuttx.bin)"
+  echo "  -i <image_name> name of the resulting image (default esp32_qemu_img.bin)"
+  echo "  -h will show this help and terminate"
+}
+
+while [ ! -z "$1" ]; do
+  case "$1" in
+  -b )
+    shift
+    BOOTLOADER_IMG=$1
+    ;;
+  -p )
+    shift
+    PARTITION_IMG=$1
+    ;;
+  -n )
+    shift
+    NUTTX_IMG=$1
+    ;;
+  -i )
+    shift
+    FLASH_IMG=$1
+    ;;
+  -h )
+    usage
+    exit 0
+    ;;
+  *)
+    usage
+    exit 1
+    ;;
+  esac
+  shift
+done
 
 # Make sure we have the required argument(s)
 
-if [ -z "${1}" ] || [ -z "${2}" ] ; then
-  printf "%s requires the bootloader and partition table binary images.\n " "${SCRIPT_NAME}"
-  printf "%s\n " "${USAGE}"
+if [ -z "${BOOTLOADER_IMG}" ] || [ -z "${PARTITION_IMG}" ] ; then
+  echo "Missing bootloader and partition table binary images."
+  usage
   exit 1
 fi
 
-BOOTLOADER=${1}
-PARTITION_TABLE=${2}
+printf "Generating %s...\n" "${FLASH_IMG}"
+printf "\tBootloader: %s\n" "${BOOTLOADER_IMG}"
+printf "\tPartition Table: %s\n" "${PARTITION_IMG}"
 
-printf "Generating esp32_qemu_image.bin...\n"
-printf "\tBootloader: %s\n" "${BOOTLOADER}"
-printf "\tPartition Table: %s\n" "${PARTITION_TABLE}"
-
-dd if=/dev/zero bs=1024 count=4096 of=esp32_qemu_image.bin && \
-dd if="${BOOTLOADER}" bs=1 seek="$(printf '%d' 0x1000)" of=esp32_qemu_image.bin conv=notrunc && \
-dd if="${PARTITION_TABLE}" bs=1 seek="$(printf '%d' 0x8000)" of=esp32_qemu_image.bin conv=notrunc && \
-dd if=nuttx.bin bs=1 seek="$(printf '%d' 0x10000)" of=esp32_qemu_image.bin conv=notrunc
+dd if=/dev/zero bs=1024 count=4096 of=${FLASH_IMG} && \
+dd if="${BOOTLOADER_IMG}" bs=1 seek="$(printf '%d' 0x1000)" of=${FLASH_IMG} conv=notrunc && \
+dd if="${PARTITION_IMG}" bs=1 seek="$(printf '%d' 0x8000)" of=${FLASH_IMG} conv=notrunc && \
+dd if=$NUTTX_IMG bs=1 seek="$(printf '%d' 0x10000)" of=${FLASH_IMG} conv=notrunc
 
 if [ ${?} -ne 0 ]; then
-  printf "Failed to generate esp32_qemu_image.bin.\n"
+  printf "Failed to generate ${FLASH_IMG}.\n"
   exit 1
 fi
 
-printf "Generated esp32_qemu_image.bin successfully!\n"
-printf "You can use QEMU for executing it with the following command line:\n"
-printf "\tqemu-system-xtensa -nographic -machine esp32 -drive file=esp32_qemu_image.bin,if=mtd,format=raw\n"
+printf "Generated ${FLASH_IMG} successfully!\n"
+printf "You can run it with QEMU using:\n"
+printf "\tqemu-system-xtensa -nographic -machine esp32 -drive file=${FLASH_IMG},if=mtd,format=raw\n"
 
-echo "esp32_qemu_image.bin" >> nuttx.manifest
+echo "${FLASH_IMG}" >> nuttx.manifest