#!/bin/sh
# tisbl.sh $tty $baudrate $tichip $firmware $resetpin $backdoorpin
# tisbl.sh /dev/ttyMSM1 115200 2652 /etc/tifirmware/blinky_bd13.bin 79 67

#assumption: resetpin and backdoorpin are low active
tty=$1 
baudrate=$2
tichip=$3
firmware=$4
resetpin=$5
backdoorpin=$6

ti_reset() #assumption:resetpin is low active 
{
    if [ ! -e /sys/class/gpio/gpio${resetpin} ]; then
        echo ${resetpin} > /sys/class/gpio/export
    fi
    echo out > /sys/class/gpio/gpio${resetpin}/direction

    echo 1 > /sys/class/gpio/gpio${resetpin}/value
    echo 0 > /sys/class/gpio/gpio${resetpin}/value
    sleep 1
    echo 1 > /sys/class/gpio/gpio${resetpin}/value
}

ti_goto_bootloader() #assumption:backdoorpin is low active 
{
    if [ ! -e /sys/class/gpio/gpio${backdoorpin} ]; then
        echo ${backdoorpin} > /sys/class/gpio/export
    fi
    echo out > /sys/class/gpio/gpio${backdoorpin}/direction

    echo 0 > /sys/class/gpio/gpio${backdoorpin}/value
    ti_reset
    sleep 1
    echo 1 > /sys/class/gpio/gpio${backdoorpin}/value
}

if [ -e $firmware ]; then 
	ti_goto_bootloader
	tisbl $tty $baudrate $tichip $firmware #try to upgrade firmware
fi