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require 'libusb'
# Abstracts access to uBoot avr tiny85 bootloader - can be used only to upload bytes
class MicroBoot
Functions = [
:get_info,
:write_page,
:erase_application,
:run_program
]
# return all thinklets
def self.all
usb = LIBUSB::Context.new
usb.devices.select { |device|
device.product == 'uBoot'
}.map { |device|
self.new(device)
}
end
def initialize devref
@device = devref
end
def info
unless defined? @info
result = control_transfer(function: :get_info, dataIn: 4)
flash_length, page_size, write_sleep = result.unpack('S>CC')
@info = {
flash_length: flash_length,
page_size: page_size,
write_sleep: 0.020, #write_sleep.to_f / 1000.0,
version: "#{@device.bcdDevice >> 8}.#{@device.bcdDevice & 0xFF}",
version_numeric: @device.bcdDevice
}
end
@info
end
def erase!
info = self.info
control_transfer(function: :erase_application)
sleep(info[:write_sleep] * ((info[:flash_length] / info[:page_size]) + 1)) # sleep for as many pages as the chip has
end
# upload a new program
def program= bytestring
info = self.info
raise "Program too long!" if bytestring.bytesize > info[:flash_length]
bytes = bytestring.bytes.to_a
erase!
address = 0
bytes.each_slice(info[:page_size]) do |bytes|
control_transfer(function: :write_page, wIndex: address, wValue: bytes.length, dataOut: bytes.pack('C*'))
sleep(info[:write_sleep])
address += bytes.length
end
end
def finished
control_transfer(function: :run_program)
sleep(info[:write_sleep]) # not sure if this is worth having? It's okay if USB fails now...
@io.close
@io = nil
end
protected
# raw opened device
def io
unless @io
@io = @device.open
end
@io
end
def control_transfer(opts = {})
opts[:bRequest] = Functions.index(opts.delete(:function)) if opts[:function]
io.control_transfer({
wIndex: 0,
wValue: 0,
bmRequestType: usb_request_type(opts),
timeout: 5000
}.merge opts)
end
def usb_request_type opts
c = LIBUSB::Call
value = c::RequestTypes[:REQUEST_TYPE_VENDOR] | c::RequestRecipients[:RECIPIENT_DEVICE]
value |= c::EndpointDirections[:ENDPOINT_OUT] if opts.has_key? :dataOut
value |= c::EndpointDirections[:ENDPOINT_IN] if opts.has_key? :dataIn
return value
end
end
class HexProgram
def initialize input
@bytes = Hash.new(0xFF)
input = input.read if input.is_a? IO
parse input
end
def binary
highest_address = @bytes.keys.max
bytestring = Array.new(highest_address + 1) { |index|
@bytes[index]
}.pack('C*')
end
protected
def parse input_text
input_text.each_line do |line|
next unless line.start_with? ':'
line.chomp!
length = line[1..2].to_i(16) # usually 16 or 32
address = line[3..6].to_i(16) # 16-bit start address
record_type = line[7..8].to_i(16)
data = line[9.. 9 + (length * 2)]
checksum = line[9 + (length * 2).. 10 + (length * 2)].to_i(16)
checksum_section = line[1...9 + (length * 2)]
checksum_calculated = checksum_section.chars.to_a.each_slice(2).map { |slice|
slice.join('').to_i(16)
}.reduce(0, &:+)
checksum_calculated = (((checksum_calculated % 256) ^ 0xFF) + 1) % 256
raise "Hex file checksum mismatch @ #{line}" unless checksum == checksum_calculated
if record_type == 0 # data record
data_bytes = data.chars.each_slice(2).map { |slice| slice.join('').to_i(16) }
data_bytes.each_with_index do |byte, index|
@bytes[address + index] = byte
end
end
end
end
end
if ARGV[0]
if ARGV[0].end_with? '.hex'
puts "parsing input file as intel hex"
test_data = HexProgram.new(open ARGV[0]).binary
else
puts "parsing input file as raw binary"
test_data = open(ARGV[0]).read
end
else
raise "Pass intel hex or raw binary as argument to script"
end
puts "Finding devices"
thinklets = MicroBoot.all
puts "Found #{thinklets.length} thinklet"
exit unless thinklets.length > 0
thinklet = thinklets.first
puts "First thinklet: #{thinklet.info.inspect}"
puts "Attempting to write '#{test_data.inspect}' to first thinklet's program memory"
puts "Bytes: #{test_data.bytes.to_a.inspect}"
thinklet.program = test_data
puts "That seems to have gone well! Telling thinklet to run program..."
thinklet.finished # let thinklet know it can go do other things now if it likes
puts "All done!"
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