arduino

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Safer Sparkfun Pro Micro

Sep 7, 2019

I needed an Arduino type board that had these requirements

Fused
Protected digital outputs.
IO was 3.3V
Rugged USB.

Fused
I didn't want the Arduino to consume all the power if there was a short.

Protected Digital Outputs
If an output was directly connected to ground I didn't want that pin to be shorted out and fail.

IO 3.3V
Everything is 3.3V now. Sensors, serial ports, Bluetooth is all 3.3V. I didn't want to have to put level translators everywhere.

Rugged USB
I needed a through-hole well-supported USB connector for repeated plugging and unplugging.

Sparkfun produces the Pro Micro in a 3V/8MHz variant, but its small form factor did not allow any fusing or other protections.

So I made my own based on firmware provided by Sparkfun for the Pro Micro 3V/8MHz.

Highlights:

Fused to 750mA
Dx IO protected by 100-ohm resistor
3.3V operation
All IO fully broken-out
Programming Header
Through-hole USB B full size
All components on Top side and had solderable
All the standard IO broken out to Dual Female Header for two connections per pin
5cm x 5cm board (dirtypcb.com compatible) two-layers only

BOM

I left off the Reference Designators for the part because of the end-user. There aren't many different components so building it isn't too difficult.

To program the bootloader, use my previous post Program Raw Atmeg32u4 to Sparkfun Pro Micro 3V/8MHz Bootloader

To program with Arduino IDE use Sparkfun Pro Micro 3V/8MHZ Installing the Arduino Addon.

I have extra PCBs that were made but not used. Contact me through the Contact page

Hi-speed Arduino IDE FTDI programmer

Aug 22, 2018

If you were able to program using Program RawATMEGA32u4toSparkfun Pro Micro directions, then add it to the Arduino Tools->Programmer menu.

This will also allow you to upload your sketch into the entire memory (without the bootloader) with command Sketch->Upload Using Programmer

Modify file "programmers.txt" in C:\Program Files (x86)\Arduino\hardware\arduino\avr
## FTDI BitBang
ftdislow.name=FT232R Low Baud Programmer
ftdislow.protocol=ftdi
ftdislow.speed=4800
ftdislow.program.extra_params=-B 115200 -P ft0
ftdislow.program.tool=avrdude

Move your avrdude.exe from the last post to
C:\Program Files (x86)\Arduino\hardware\tools\avr\bin

Move your avrdude.conf from the last post to
C:\Program Files (x86)\Arduino\hardware\tools\avr\etc

Program with Upload with Programmer

C:\Program Files (x86)\Arduino\hardware\tools\avr/bin/avrdude -CC:\Program Files (x86)\Arduino\hardware\tools\avr/etc/avrdude.conf -v -patmega32u4 -cftdi -B 115200 -P ft0 -Uflash:w:C:\Users\jeremyh\AppData\Local\Temp\arduino_build_127873/REV-B.ino.hex:i

avrdude: Version 5.10, compiled on Dec 19 2010 at 22:24:28

System wide configuration file is "C:\Program Files (x86)\Arduino\hardware\tools\avr/etc/avrdude.conf"

Using Port : ft0

Using Programmer : ftdi

Setting bit clk period : 115200.0

avrdude: BitBang OK

avrdude: pin assign miso 3 sck 1 mosi 0 reset 4

avrdude: drain OK

AVR Part : ATmega32U4

Chip Erase delay : 9000 us

PAGEL : PD7

BS2 : PA0

RESET disposition : dedicated

RETRY pulse : SCK

serial program mode : yes

parallel program mode : yes

Timeout : 200

StabDelay : 100

CmdexeDelay : 25

SyncLoops : 32

ByteDelay : 0

PollIndex : 3

PollValue : 0x53

Memory Detail :

Block Poll Page Polled

Memory Type Mode Delay Size Indx Paged Size Size #Pages MinW MaxW ReadBack

----------- ---- ----- ----- ---- ------ ------ ---- ------ ----- ----- ---------

eeprom 65 10 8 0 no 1024 8 0 9000 9000 0x00 0x00

flash 65 6 128 0 yes 32768 128 256 4500 4500 0x00 0x00

lfuse 0 0 0 0 no 1 0 0 9000 9000 0x00 0x00

hfuse 0 0 0 0 no 1 0 0 9000 9000 0x00 0x00

efuse 0 0 0 0 no 1 0 0 9000 9000 0x00 0x00

lock 0 0 0 0 no 1 0 0 9000 9000 0x00 0x00

calibration 0 0 0 0 no 1 0 0 0 0 0x00 0x00

signature 0 0 0 0 no 3 0 0 0 0 0x00 0x00

Programmer Type : ft245r

Description : FT232R BitBang Programmer

ft245r: bitclk 115200 -> ft baud 57600

avrdude: AVR device initialized and ready to accept instructions

Reading | ################################################## | 100% -0.00s

avrdude: Device signature = 0x1e9587

avrdude: NOTE: FLASH memory has been specified, an erase cycle will be performed

To disable this feature, specify the -D option.

avrdude: erasing chip

ft245r: bitclk 115200 -> ft baud 57600

avrdude: reading input file "C:\Users\jeremyh\AppData\Local\Temp\arduino_build_127873/REV-B.ino.hex"

avrdude: writing flash (5648 bytes):

Writing | ################################################## | 100% 2.39s

avrdude: 5648 bytes of flash written

avrdude: verifying flash memory against C:\Users\jeremyh\AppData\Local\Temp\arduino_build_127873/REV-B.ino.hex:

avrdude: load data flash data from input file C:\Users\jeremyh\AppData\Local\Temp\arduino_build_127873/REV-B.ino.hex:

avrdude: input file C:\Users\jeremyh\AppData\Local\Temp\arduino_build_127873/REV-B.ino.hex contains 5648 bytes

avrdude: reading on-chip flash data:

Reading | ################################################## | 100% 2.00s

avrdude: verifying ...

avrdude: 5648 bytes of flash verified

avrdude done. Thank you.

---------------------------------------------------------------------------------------
Burn Bootloader
C:\Program Files (x86)\Arduino\hardware\tools\avr/bin/avrdude -CC:\Program Files (x86)\Arduino\hardware\tools\avr/etc/avrdude.conf -v -patmega32u4 -cftdi -B 115200 -P ft0 -Uflash:w:C:\Users\jeremyh\AppData\Local\Arduino15\packages\SparkFun\hardware\avr\1.1.10/bootloaders/caterina/Caterina-promicro8.hex:i -Ulock:w:0x2F:m

avrdude: Version 5.10, compiled on Dec 19 2010 at 22:24:28
Copyright (c) 2000-2005 Brian Dean, http://www.bdmicro.com/
Copyright (c) 2007-2009 Joerg Wunsch

System wide configuration file is "C:\Program Files (x86)\Arduino\hardware\tools\avr/etc/avrdude.conf"

Using Port : ft0
Using Programmer : ftdi
Setting bit clk period : 115200.0
avrdude: BitBang OK
avrdude: pin assign miso 3 sck 1 mosi 0 reset 4
avrdude: drain OK
AVR Part : ATmega32U4
Chip Erase delay : 9000 us
PAGEL : PD7
BS2 : PA0
RESET disposition : dedicated
RETRY pulse : SCK
serial program mode : yes
parallel program mode : yes
Timeout : 200
StabDelay : 100
CmdexeDelay : 25
SyncLoops : 32
ByteDelay : 0
PollIndex : 3
PollValue : 0x53
Memory Detail :

Block Poll Page Polled
Memory Type Mode Delay Size Indx Paged Size Size #Pages MinW MaxW ReadBack
----------- ---- ----- ----- ---- ------ ------ ---- ------ ----- ----- ---------
eeprom 65 10 8 0 no 1024 8 0 9000 9000 0x00 0x00
flash 65 6 128 0 yes 32768 128 256 4500 4500 0x00 0x00
lfuse 0 0 0 0 no 1 0 0 9000 9000 0x00 0x00
hfuse 0 0 0 0 no 1 0 0 9000 9000 0x00 0x00
efuse 0 0 0 0 no 1 0 0 9000 9000 0x00 0x00
lock 0 0 0 0 no 1 0 0 9000 9000 0x00 0x00
calibration 0 0 0 0 no 1 0 0 0 0 0x00 0x00
signature 0 0 0 0 no 3 0 0 0 0 0x00 0x00

Programmer Type : ft245r
Description : FT232R BitBang Programmer

ft245r: bitclk 115200 -> ft baud 57600
avrdude: AVR device initialized and ready to accept instructions

Reading | ################################################## | 100% 0.00s

avrdude: Device signature = 0x1e9587
avrdude: NOTE: FLASH memory has been specified, an erase cycle will be performed
To disable this feature, specify the -D option.
avrdude: erasing chip
ft245r: bitclk 115200 -> ft baud 57600
avrdude: reading input file "C:\Users\jeremyh\AppData\Local\Arduino15\packages\SparkFun\hardware\avr\1.1.10/bootloaders/caterina/Caterina-promicro8.hex"
avrdude: writing flash (32758 bytes):

Writing | ################################################## | 100% 13.67s

avrdude: 32758 bytes of flash written
avrdude: verifying flash memory against C:\Users\jeremyh\AppData\Local\Arduino15\packages\SparkFun\hardware\avr\1.1.10/bootloaders/caterina/Caterina-promicro8.hex:
avrdude: load data flash data from input file C:\Users\jeremyh\AppData\Local\Arduino15\packages\SparkFun\hardware\avr\1.1.10/bootloaders/caterina/Caterina-promicro8.hex:
avrdude: input file C:\Users\jeremyh\AppData\Local\Arduino15\packages\SparkFun\hardware\avr\1.1.10/bootloaders/caterina/Caterina-promicro8.hex contains 32758 bytes
avrdude: reading on-chip flash data:

Reading | ################################################## | 100% 11.51s

avrdude: verifying ...
avrdude: 32758 bytes of flash verified
avrdude: reading input file "0x2F"
avrdude: writing lock (1 bytes):

Writing | ################################################## | 100% 0.01s

avrdude: 1 bytes of lock written
avrdude: verifying lock memory against 0x2F:
avrdude: load data lock data from input file 0x2F:
avrdude: input file 0x2F contains 1 bytes
avrdude: reading on-chip lock data:

Reading | ################################################## | 100% 0.00s

avrdude: verifying ...
avrdude: 1 bytes of lock verified

avrdude done. Thank you.

Program Raw Atmeg32u4 to Sparkfun Pro Micro 3V/8MHz Bootloader

Jul 30, 2018

Hardware:

FTDI ft232 Breakout board

ft232 board ATMEGA32u4
3.3V 3.3V
GND GND
TX MOSI
CTS MISO
RX SCK
DTR RST_N

All connections are on the end to the breakout board (except 3.3V)

Software:

Reference https://electronut.in/bootloader-atmega32u4/
Avrdude that has the ft232 driver

avrdude-serjtag04n

Addtion to avrdude-serjtag04n "avrdude.conf"
programmer
id = "ftdi";
desc = "FT232R BitBang Programmer";
type = ft245r;
miso = 3; # cts
sck = 1; # rxd
mosi = 0; # txd
reset = 4; # dtr
# baudrate = 4800 ;
;

Sparkfun Pro Micro 3V bootloader
https://github.com/sparkfun/SF32u4_boards/tree/master/sparkfun/avr/bootloaders/caterina/Caterina-promicro8.hex

Put "Caterina-promicro8.hex", "avrdude.conf" and avrdude-serjtag04n's "avrdude.exe" in the same directory.

Output

C:\avrdude-serjtag04n\bin>avrdude -P ft0 -c ftdi -p m32u4 -B 4800 -U lfuse:w:0xff:m -U hfuse:w:0xd8:m -U efuse:w:0xce:m
avrdude: BitBang OK
avrdude: pin assign miso 3 sck 1 mosi 0 reset 4
avrdude: drain OK

ft245r: bitclk 4800 -> ft baud 2400
avrdude: AVR device initialized and ready to accept instructions

Reading | ################################################## | 100% 0.01s

avrdude: Device signature = 0x1e9587
avrdude: reading input file "0xff"
avrdude: writing lfuse (1 bytes):

Writing | ################################################## | 100% 0.02s

avrdude: 1 bytes of lfuse written
avrdude: verifying lfuse memory against 0xff:
avrdude: load data lfuse data from input file 0xff:
avrdude: input file 0xff contains 1 bytes
avrdude: reading on-chip lfuse data:

Reading | ################################################## | 100% 0.01s

avrdude: verifying ...
avrdude: 1 bytes of lfuse verified
avrdude: reading input file "0xd8"
avrdude: writing hfuse (1 bytes):

Writing | ################################################## | 100% 0.02s

avrdude: 1 bytes of hfuse written
avrdude: verifying hfuse memory against 0xd8:
avrdude: load data hfuse data from input file 0xd8:
avrdude: input file 0xd8 contains 1 bytes
avrdude: reading on-chip hfuse data:

Reading | ################################################## | 100% 0.02s

avrdude: verifying ...
avrdude: 1 bytes of hfuse verified
avrdude: reading input file "0xce"
avrdude: writing efuse (1 bytes):

Writing | ################################################## | 100% 0.02s

avrdude: 1 bytes of efuse written
avrdude: verifying efuse memory against 0xce:
avrdude: load data efuse data from input file 0xce:
avrdude: input file 0xce contains 1 bytes
avrdude: reading on-chip efuse data:

Reading | ################################################## | 100% 0.02s

avrdude: verifying ...
avrdude: 1 bytes of efuse verified

avrdude: safemode: Fuses OK

avrdude done. Thank you.

C:\avrdude-serjtag04n\bin>avrdude -P ft0 -c ftdi -p m32u4 -B 4800
avrdude: BitBang OK
avrdude: pin assign miso 3 sck 1 mosi 0 reset 4
avrdude: drain OK

ft245r: bitclk 4800 -> ft baud 2400
avrdude: AVR device initialized and ready to accept instructions

Reading | ################################################## | 100% 0.00s

avrdude: Device signature = 0x1e9587

avrdude: safemode: Fuses OK

avrdude done. Thank you.

C:\avrdude-serjtag04n\bin>avrdude -P ft0 -c ftdi -p m32u4 -B 4800 -U lfuse:r:low_fuse_val.hex:h -U hfuse:r:high_fuse_val.hex:h
avrdude: BitBang OK
avrdude: pin assign miso 3 sck 1 mosi 0 reset 4
avrdude: drain OK

ft245r: bitclk 4800 -> ft baud 2400
avrdude: AVR device initialized and ready to accept instructions

Reading | ################################################## | 100% 0.01s

avrdude: Device signature = 0x1e9587
avrdude: reading lfuse memory:

Reading | ################################################## | 100% 0.02s

avrdude: writing output file "low_fuse_val.hex"
avrdude: reading hfuse memory:

Reading | ################################################## | 100% 0.02s

avrdude: writing output file "high_fuse_val.hex"

avrdude: safemode: Fuses OK

avrdude done. Thank you.

C:\avrdude-serjtag04n\bin>avrdude -P ft0 -c ftdi -p m32u4 -B 4800 -U flash:w:Caterina-promicro8.hex
avrdude: BitBang OK
avrdude: pin assign miso 3 sck 1 mosi 0 reset 4
avrdude: drain OK

ft245r: bitclk 4800 -> ft baud 2400
avrdude: AVR device initialized and ready to accept instructions

Reading | ################################################## | 100% 0.01s

avrdude: Device signature = 0x1e9587
avrdude: NOTE: FLASH memory has been specified, an erase cycle will be performed
To disable this feature, specify the -D option.
avrdude: erasing chip
ft245r: bitclk 4800 -> ft baud 2400
avrdude: reading input file "Caterina-promicro8.hex"
avrdude: input file Caterina-promicro8.hex auto detected as raw binary
avrdude: writing flash (32768 bytes):

Writing | ################################################## | 100% 217.75s

Final:

Remove SCK, MISO, MOSI and RST_N, Power Cycle and then Plug USB. The COM should show up in Device Manager.