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require 'libusb'
# Abstracts access to micronucleus avr tiny85 bootloader - can be used only to erase and upload bytes
class Micronucleus
Functions = [
:get_info,
:write_page,
:erase_application,
:run_program
]
# return all micronucleus devices connected to computer
def self.all
usb = LIBUSB::Context.new
usb.devices.select { |device|
device.idVendor == 0x16d0 && device.idProduct == 0x0753
}.map { |device|
self.new(device)
}
end
def initialize devref
@device = devref
end
def info
unless @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,
pages: (flash_length.to_f / page_size).ceil,
write_sleep: write_sleep.to_f / 1000.0,
version: "#{@device.bcdDevice >> 8}.#{@device.bcdDevice & 0xFF}",
version_numeric: @device.bcdDevice
}
end
@info
end
def erase!
puts "erasing"
info = self.info
control_transfer(function: :erase_application)
info[:pages].times do
sleep(info[:write_sleep]) # sleep for as many pages as the chip has to erase
end
puts "erased chip"
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 |slice|
slice.push(0xFF) while slice.length < info[:page_size] # ensure every slice is one page_size long - pad out if needed
puts "uploading @ #{address} of #{bytes.length}"
control_transfer(function: :write_page, wIndex: address, wValue: slice.length, dataOut: slice.pack('C*'))
sleep(info[:write_sleep])
address += slice.length
end
end
def finished
info = self.info
puts "asking device to finish writing"
control_transfer(function: :run_program)
puts "waiting for device to finish"
# sleep for as many pages as the chip could potentially need to write - this could be smarter
info[:pages].times do
sleep(info[:write_sleep])
end
@io.close
@io = nil
end
def inspect
"<MicroBoot #{info[:version]}: #{(info[:flash_length] / 1024.0).round(1)} kb programmable>"
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
# calculate usb request type
def usb_request_type opts #:nodoc:
value = LIBUSB::REQUEST_TYPE_VENDOR | LIBUSB::RECIPIENT_DEVICE
value |= LIBUSB::ENDPOINT_OUT if opts.has_key? :dataOut
value |= LIBUSB::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
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