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diff --git a/doc/supported_hw/supported_prog/serprog/arduino_flasher.rst b/doc/supported_hw/supported_prog/serprog/arduino_flasher.rst new file mode 100644 index 000000000..ada05195d --- /dev/null +++ b/doc/supported_hw/supported_prog/serprog/arduino_flasher.rst @@ -0,0 +1,227 @@ +=============== +Arduino flasher +=============== + +.. container:: danger, admonition + + **WARNING** + + Make sure that the Arduino SPI voltages and the flash chip voltages matches: Without any extra resistors or level shifter, + the Arduino Uno and Duemillanove SPI pins are at 5V, while most chips operate at 3.3v. + +Hardware basics +=============== + +You'll need to have: + +* a supported Arduino, these are + + * any based on the ATmega328 (/168/88 will work with small changes too), like the Arduino Uno R3. + * Arduino Mega or Mega2560, but notice that the software has a different branch for them. + +* a way to convert the 5V logic levels to 3.3V (except if 3.3V arduino, these are rarer) +* a 3.3V SPI flash chip that is supported by flashrom + +Notes: + +* The FTDI based usb-serial converters are the fastest. +* 1.8V conversion isnt covered here, yet. + +There are some simple schematics included here (`source <https://github.com/flashrom/wiki-arduino-spi-example-schematics>`_). +The idea is that you pick one version from each part 1 through 3, and connect the pin/net names. + +Part 1: The Arduino +------------------- + +ATmega328 based ones: + +.. image:: P1v1_arduino328.png + +For the Arduino Megas: + +.. image:: P1v2_arduino1280.png + +Part 2: Level translation +------------------------- + +There are a few options here, ranging from the simple resistors (v1) to a buffer chip (v3). + +One thing to remember about the resistor dividers is that they're not strong enough to do ISP. + +Here's the simple resistors: + +.. image:: P2v1_resdivider.png + +The part count for the resistor divider is 6 resistors of 2 types or 9 of one type. + +Here's one with 5 resistors, the downside is that you'll need to modify the firmware a little: + +.. image:: P2v2_oc_cs.png + +The 3rd version is using the DIP16 HEF4050 buffer chip: + +.. image:: P2v3_buffer4050.png + +Part 3: The SPI Flash chip +-------------------------- + +The DIL-8 and SOIC-8 versions connect like this: + +.. image:: P3v1_dil8_so8_spi.png + +For the SMD SOIC-16 chips the pinout is: + +.. image:: P3v2_so16_spi.png + +Gallery of some flashers +======================== + +.. image:: 166px-Serprogduino_v2.jpeg + +.. _arduino shield: + +Alternative: Shield with SPI and LPC/FWH for 5V Arduinos +======================================================== + +.. image:: 250px-Arduino_5V_lpc_spi_shield.jpg + +.. image:: 250px-Arduino_lpcspi_shield_render.png + +`Firmware and hardware sources <https://github.com/urjaman/frser-m328lpcspi>`_ + +`Shield PCB shared at oshpark <https://oshpark.com/shared_projects/E6jwmbWy>`_ + +* This shield and firmware was built for 5V ATMega328s with FTDI, variations to that will need adaptations in building the shield and/or in the firmware. + The Uno R3 will work with the fast-usbserial U2 firmware. +* This shield uses a different pin for SPI CS than the other circuits on this page, and has LPC/FWH capability, thus different firmware. + Frser-duino does have the code for using the CS like in this shield, but you need to modify spihw.h. +* Note: do check for any incompatibilities between your arduino and the shield, eg. the PD7 used as LPC CLK clashes with BT reset in BT arduinos. +* For LPC/FWH, current (16/02/01) flashrom trunk will be really slow, please use this branch instead. + +Software and setup +================== + +The Arduino Uno R3 and other arduinos with an ATmega8U2/16U2 as an usb-serial converter have lots of bugs in their usb-serial firmware +that prevent it from operating at more than a limited 115200 baud. The frser-duino firmware works around this by default if you use the appropriate make target, +but there exists a firmware that allows these to be used like the FTDI at 2Mbaud: `fast-usbserial <https://github.com/urjaman/fast-usbserial>`_. + +Setup +----- + +Required software +^^^^^^^^^^^^^^^^^ + +To make it work you need: + +* A recent flashrom with the serprog protocol compiled in (most packaged versions do) +* `frser-duino which runs on the arduino <https://github.com/urjaman/frser-duino>`_ + + * This page used to link to `serprog-duino <https://gitorious.org/gnutoo-personal-arduino-projects/serprog-duino>`_, + frser-duino should build in a similar fashion and has better serial buffering and some other features (spi speed setting). + +* The avr toolchain(avr-gcc, avr-libc,make etc...) + +Building the software +^^^^^^^^^^^^^^^^^^^^^ + +First get the firmware source:: + + $ git clone --recursive git://github.com/urjaman/frser-duino + $ cd frser-duino + +Then build it: + +For a board with a 8u2 or a 16u2:: + + $ make u2 && make flash-u2 + +For a board with an ftdi:: + + $ make ftdi && make flash-ftdi + +Building for the Mega1280 or 2560 +^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ + +As above, except use the branch for the 1280:: + + $ git clone --recursive git://github.com/urjaman/frser-duino -b arduino-mega-1280 + +For the Mega2560, change the Makefile to target the correct MCU (replace 1280 with 2560). Please also verify that the avrdude command is as expected for your device. + +Running flashrom +^^^^^^^^^^^^^^^^ + +The right flashrom arguments are explained in the :doc:`/classic_cli_manpage`, or here. + +Available targets: + +* ftdi, flash-ftdi: + For the Arduinos with an FTDI + compatible flashrom arguments:: + + flashrom -p serprog:dev=/dev/ttyUSB0:2000000 + + Other boards using an hardware USB<->Serial converter might work too. + +* u2, flash-u2: + For the Arduino with a 8u2 or a 16u2 + compatible flashrom arguments:: + + flashrom -p serprog:dev=/dev/ttyACM0:115200 + +So for a board that has an ftdi that would give:: + + flashrom -p serprog:dev=/dev/ttyUSB0:2000000 + +Speed +^^^^^ + +The speed is very dependant on the flash chip used: + +* Its capacity impacts the speed a lot, as you would expect. +* The chip model as also a huge impact. + +Duemillanove +^^^^^^^^^^^^ + +With the duemillanove:: + + # time flashrom -p serprog:dev=/dev/ttyUSB0:2000000 -r duemillanove.rom + flashrom v0.9.7-r1711 on Linux 3.18.3-gnu-1 (i686) + flashrom is free software, get the source code at http://www.flashrom.org + + Calibrating delay loop... delay loop is unreliable, trying to continue OK. + serprog: Programmer name is "serprog-duino" + Found Winbond flash chip "W25Q32.V" (4096 kB, SPI) on serprog. + Reading flash... done. + flashrom -p serprog:dev=/dev/ttyUSB0:2000000 -r duemillanove.rom + +we have:: + + 4.23s user 0.29s system 8% cpu 56.010 total + +Uno +^^^ + +With the Arduino uno:: + + # flashrom -p serprog:dev=/dev/ttyACM0:115200 -r uno.rom + flashrom v0.9.7-r1711 on Linux 3.18.3-gnu-1 (i686) + flashrom is free software, get the source code at http://www.flashrom.org + + Calibrating delay loop... delay loop is unreliable, trying to continue OK. + serprog: Programmer name is "serprog-duino" + Found Winbond flash chip "W25Q32.V" (4096 kB, SPI) on serprog. + Reading flash... done. + flashrom -p serprog:dev=/dev/ttyACM0:115200 -r uno.rom + +we have:: + + 4.77s user 0.65s system 1% cpu 6:02.43 total + +Tested chips +^^^^^^^^^^^^ + +* SST25VF016B => huge issues, not recognized by the 3.3v version, had to use the 5v version which is over maximum allowed voltage, + also had to lower the serial speed to 115200, ultra slow to write(seem related to the chip itself, since that with the openmoko programmer it's even slower...)... +* W25X80 works well in 3.3v mode(5v works also but it's highly not advised to use 5v) |