[sw/image_gen] ✨ update UART upload script

sw/image_gen/uart_upload.sh

@@ -6,19 +6,22 @@ set -e
 
 if [ $# -ne 2 ]
 then
-  echo "Upload image via serial port (UART) to the NEORV32 bootloader."
-  echo "Reset processor before starting the upload."
-  echo "Usage:   [sudo] sh uart_upload.sh <serial port> <NEORV32 executable>"
-  echo "Example: sudo sh uart_upload.sh /dev/ttyS6 path/to/project/neorv32_exe.bin"
+  printf "Upload and execute application image via serial port (UART) to the NEORV32 bootloader.\n"
+  printf "Reset processor before starting the upload.\n\n"
+  printf "Usage:   sh uart_upload.sh <serial port> <NEORV32 executable>\n"
+  printf "Example: sh uart_upload.sh /dev/ttyS6 path/to/project/neorv32_exe.bin\n"
   exit
 fi
 
 # configure serial port
-stty -F "$1" 19200 -hup raw -echo -echoe -echok -echoctl -echoke -crtscts cs8 -cstopb noflsh clocal cread
+stty -F "$1" 19200 -hup raw -echo -echoe -echok -echoctl -echoke -ixon cs8 -cstopb noflsh clocal cread
 
-# trigger fast upload mode and get response
+# abort autoboot sequence
+printf " " > $1 # send any char that triggers no command
+
+# execute upload command and get response
 exec 3<$1                              # redirect serial output to fd 3
-  cat <&3 > uart_upload.response.dat & # redirect serial output to file
+  cat <&3 > uart_upload.response.tmp & # redirect serial output to file
   PID=$!                               # save pid to kill cat
     printf "u" > $1                    # send upload command to serial port
     sleep 0.5s                         # wait for bootloader response
@@ -27,18 +30,18 @@ exec 3<$1                              # redirect serial output to fd 3
 exec 3<&- # free fd 3
 
 # check response
-if ! grep -Fq "Awaiting neorv32_exe.bin" uart_upload.response.dat;
+if ! grep -Fq "Awaiting neorv32_exe.bin" uart_upload.response.tmp;
 then
-  echo "Bootloader response error."
-  echo "Reset processor before starting the upload."
-  rm -f uart_upload.response.dat
+  printf "Bootloader response error!\n"
+  printf "Reset processor before starting the upload.\n"
+  rm -f uart_upload.response.tmp
   exit
 fi
 
 # send executable and get response
-echo -n "Uploading... "
+printf "Uploading executable..."
 exec 3<$1                              # redirect serial output to fd 3
-  cat <&3 > uart_upload.response.dat & # redirect serial output to file
+  cat <&3 > uart_upload.response.tmp & # redirect serial output to file
   PID=$!                               # save pid to kill cat
     cat "$2" > "$1"                    # send executable to serial port
     sleep 3s                           # wait for bootloader response
@@ -47,12 +50,14 @@ exec 3<$1                              # redirect serial output to fd 3
 exec 3<&- # free fd 3
 
 # check response
-if ! grep -Fq "OK" uart_upload.response.dat;
+if ! grep -Fq "OK" uart_upload.response.tmp;
 then
-  echo "Upload error."
-  rm -f uart_upload.response.dat
-  exit
+  printf " FAILED!\n"
+else
+  printf " OK\n"
+  echo "Starting application..."
+  printf "e" > $1
 fi
 
-rm -f uart_upload.response.dat
-echo "Done."
+rm -f uart_upload.response.tmp
+exit