Add camera power down/up workaround

Change-Id: Ia666caa8dad83bf803b47bc1526316e2b3019043

nexus-non-interactive-test.sh

diff --git a/nexus-non-interactive-test.sh b/nexus-non-interactive-test.sh
index 411d605..c67d94c 100755
--- a/nexus-non-interactive-test.sh
+++ b/nexus-non-interactive-test.sh
@@ -25,6 +25,19 @@
 export LOG_TIMEOUT="${LOG_TIMEOUT:-900}"
 export LOG_CHECK_INTERVAL="${LOG_CHECK_INTERVAL:-30}"
 
+
+function mcu_write() {
+    string=$1
+    length=${#string}
+    for ((i = 0; i < length; i++)); do
+        char="${string:i:1}"
+        echo -n "$char"
+        sleep 0.5
+    done > "/dev/Nexus-FTDI-${NEXUS_ID}-MCU-UART"
+    echo -e "\r" > "/dev/Nexus-FTDI-${NEXUS_ID}-MCU-UART"
+}
+
+
 if [ $# -lt 2 ] || [ $# -gt 3 ] ; then
 cat << EOF
     $0 <bitstream> <binary> [nexus index]
@@ -52,9 +65,14 @@
 then
     echo "/dev/Nexus-CP210-FPGA-UART-${NEXUS_ID} appears to be busy"
 fi
+if fuser "/dev/Nexus-FTDI-${NEXUS_ID}-MCU-UART"
+then
+    echo "/dev/Nexus-FTDI-${NEXUS_ID}-MCU-UART appears to be busy"
+fi
 
 stty --file="/dev/Nexus-FTDI-${NEXUS_ID}-FPGA-UART" 115200
 stty --file="/dev/Nexus-CP210-FPGA-UART-${NEXUS_ID}" 115200
+stty --file="/dev/Nexus-FTDI-${NEXUS_ID}-MCU-UART" 115200
 
 # Starting logging the UARTs
 cat "/dev/Nexus-FTDI-${NEXUS_ID}-FPGA-UART" > uart.sc.log &
@@ -68,14 +86,19 @@
       kill -KILL ${SC_UART_PID} ; kill -KILL ${SMC_UART_PID}' 0
 
 if [[ -f "${BITSTREAM_PATH}" ]]; then
+    # Issue a no-op command to flush the character buffer in case it isn't empty
+    mcu_write "help"
     scp \
         "${BITSTREAM_PATH}" \
         "root@nexus${NEXUS_ID}:/mnt/mmcp1/"
+    mcu_write "camera_powerdown"
+    sleep 5
     # zturn exits with 1 even when working correctly. Mask with exit 0
     BITSTREAM_NAME=$(basename "${BITSTREAM_PATH}")
     ssh \
         "root@nexus${NEXUS_ID}" \
         "/mnt/mmcp1/zturn -d a /mnt/mmcp1/${BITSTREAM_NAME} ; exit 0"
+    mcu_write "camera_powerup"
 fi
 
 OT_TOOL_PATH=`command -v opentitantool`