Ah I see. There are indeed a few differences with ATTiny85s, the one in my Digispark / Digistump is running at 16.5 MHz whereas the standard board file dictates 8 MHz.
But the fuses can only be set for one variant ofc.
What board = .. value did you select in the platformio.ini?
[env:attiny85]
platform = atmelavr
board = attiny85
framework = arduino
lib_deps =
felias-fogg/SoftI2CMaster@^2.1.3
upload_port = COM1
monitor_port = COM3
monitor_speed = 9600
Can you use AVRdude to read fuses to spot differences between the Tinys?
Try adding
upload_flags =
-U
lfuse:w:0xE2:m
-U
hfuse:w:0x5F:m
-U
efuse:w:0xFF:m
-U
lock:w:0xFF:m
to the platformio.ini and then upload the firmware again. The fuses (AVR Fuse Calculator for ATtiny85) should set an 8MHz configuration.
Some good news.
The ‘SDA and SCL are low’ is still there but I also tested with one of the ‘new’ Tinys and it worked too.
Suddenly today when trying to upload I get an upload error again. Is there a way to get more information on the error? Can I set verbose on the upload? How and where do I do it?
> Executing task in folder I2C_scanner: C:\Users\hans\.platformio\penv\Scripts\platformio.exe run --target upload <
Processing attiny85 (platform: atmelavr; board: attiny85; framework: arduino)
------------------------------------------------------------------------------------------------
Verbose mode can be enabled via `-v, --verbose` option
CONFIGURATION: https://docs.platformio.org/page/boards/atmelavr/attiny85.html
PLATFORM: Atmel AVR (3.2.0) > Generic ATtiny85
HARDWARE: ATTINY85 8MHz, 512B RAM, 8KB Flash
DEBUG: Current (simavr) On-board (simavr)
PACKAGES:
- framework-arduino-avr-attiny 1.3.2
- tool-avrdude 1.60300.200527 (6.3.0)
- toolchain-atmelavr 1.70300.191015 (7.3.0)
LDF: Library Dependency Finder -> http://bit.ly/configure-pio-ldf
LDF Modes: Finder ~ chain, Compatibility ~ soft
Found 13 compatible libraries
Scanning dependencies...
Dependency Graph
|-- <SoftI2CMaster> 2.1.3
|-- <SoftwareSerial> 1.0
Building in release mode
Checking size .pio\build\attiny85\firmware.elf
Advanced Memory Usage is available via "PlatformIO Home > Project Inspect"
RAM: [===== ] 54.7% (used 280 bytes from 512 bytes)
Flash: [===== ] 45.8% (used 3756 bytes from 8192 bytes)
Configuring upload protocol...
AVAILABLE: usbtiny
CURRENT: upload_protocol = usbtiny
Looking for upload port...
Uploading .pio\build\attiny85\firmware.hex
avrdude: initialization failed, rc=-1
Double check connections and try again, or use -F to override
this check.
avrdude done. Thank you.
*** [upload] Error 1
================================== [FAILED] Took 4.03 seconds ==================================
The terminal process "C:\Users\hans\.platformio\penv\Scripts\platformio.exe 'run', '--target', 'upload'" terminated with exit code: 1.That’s saying the programmer tried to program the chip (by sending SPI commands in this case) and heard nothing back.
You can add
upload_flags = -vvvv
in the platformio.ini to add more verbosity to AVRdude, that’s even better than what would happen with the project task “Advanved → Verbose Upload”.
Yes, that is more information but difficult to understand.
Uploading .pio\build\attiny85\firmware.hex
avrdude: Version 6.3, compiled on Sep 12 2016 at 17:24:16
Copyright (c) 2000-2005 Brian Dean, http://www.bdmicro.com/
Copyright (c) 2007-2014 Joerg Wunsch
System wide configuration file is "C:\Users\hans\.platformio\packages\tool-avrdude\avrdude.conf"
Using Port : usb
Using Programmer : usbtiny
avrdude: usbdev_open(): Found USBtinyISP, bus:device: bus-0:\\.\libusb0-0001--0x1781-0x0c9f
AVR Part : ATtiny85
Chip Erase delay : 400000 us
PAGEL : P00
BS2 : P00
RESET disposition : possible i/o
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 12 4 0 no 512 4 0 4000 4500 0xff 0xff
Block Poll Page Polled
Memory Type Mode Delay Size Indx Paged Size Size #Pages MinW MaxW ReadBack
----------- ---- ----- ----- ---- ------ ------ ---- ------ ----- ----- ---------
flash 65 6 32 0 yes 8192 64 128 30000 30000 0xff 0xff
Block Poll Page Polled
Memory Type Mode Delay Size Indx Paged Size Size #Pages MinW MaxW ReadBack
----------- ---- ----- ----- ---- ------ ------ ---- ------ ----- ----- ---------
signature 0 0 0 0 no 3 0 0 0 0 0x00 0x00
Block Poll Page Polled
Memory Type Mode Delay Size Indx Paged Size Size #Pages MinW MaxW ReadBack
----------- ---- ----- ----- ---- ------ ------ ---- ------ ----- ----- ---------
lock 0 0 0 0 no 1 0 0 9000 9000 0x00 0x00
Block Poll Page Polled
Memory Type Mode Delay Size Indx Paged Size Size #Pages MinW MaxW ReadBack
----------- ---- ----- ----- ---- ------ ------ ---- ------ ----- ----- ---------
lfuse 0 0 0 0 no 1 0 0 9000 9000 0x00 0x00
Block Poll Page Polled
Memory Type Mode Delay Size Indx Paged Size Size #Pages MinW MaxW ReadBack
----------- ---- ----- ----- ---- ------ ------ ---- ------ ----- ----- ---------
hfuse 0 0 0 0 no 1 0 0 9000 9000 0x00 0x00
Block Poll Page Polled
Memory Type Mode Delay Size Indx Paged Size Size #Pages MinW MaxW ReadBack
----------- ---- ----- ----- ---- ------ ------ ---- ------ ----- ----- ---------
efuse 0 0 0 0 no 1 0 0 9000 9000 0x00 0x00
Block Poll Page Polled
Memory Type Mode Delay Size Indx Paged Size Size #Pages MinW MaxW ReadBack
----------- ---- ----- ----- ---- ------ ------ ---- ------ ----- ----- ---------
calibration 0 0 0 0 no 1 0 0 0 0 0x00 0x00
Programmer Type : USBtiny
Description : USBtiny simple USB programmer, http://www.ladyada.net/make/usbtinyisp/
avrdude: programmer operation not supported
avrdude: Using SCK period of 10 usec
CMD: [ac 53 00 00] [00 00 00 00]
CMD: [ac 53 00 00] [00 00 00 00]
avrdude: initialization failed, rc=-1
Double check connections and try again, or use -F to override
this check.
avrdude done. Thank you.
*** [upload] Error 1
================================= [FAILED] Took 12.56 seconds =================================
The terminal process "C:\Users\hans\.platformio\penv\Scripts\platformio.exe 'run', '--target', 'upload'" terminated with exit code: 1.The USBtinyISP is found, but the chip is not responding.
Either the chip is dead or it is inserted in some wrong way, or something else has gone wrong.
Is the ATTiny disconnected from everything else in the circuit but the programmer?
Other possibility: Haunted setup. 
Disconnected everything from the circuit and still failed. Tried a second Tiny - failed. Tried a third Tiny - success. It looks like I’ve bricked two Tinys. I found AVRdudeSS and wanted to read the fuses in the Tinys to compare. I was warned not write anything and I didn’t. I only tried to read the fuses and not being sure about the parameters I emailed Zak Kemble and got some help but I never got it working. I don’t think I could have ruined the Tiny but who am I to know.
BTW, the upload flags you gave me
upload_flags =
-U
lfuse:w:0xE2:m
-U
hfuse:w:0x5F:m
-U
efuse:w:0xFF:m
-U
lock:w:0xFF:m
are they to be used just once and then taken out? Do the fuse values stick until you set them to something else?
This is not good o_o. But I also don’t know what it could be. I’ve had zero issues with the ATTiny85 on my Digispark Mini (that’s what they seem to call it nowadays) regarding that yet.
Maybe the clock settings are still wrong for avrdude and it’s programming it faster than it can handle. Maybe Attiny85 usbasp programming - works on Arduino IDE, fails on PlatformIO - #12 by marcosjl31 is still valid. Can you try one of your bricked ATTinys with the addition of those upload_flags?
You may also try higher values for -B, see HELP!!! | USBtinyISP | Adafruit Learning System
Those upload flags gives an error:
upload_flags =
-U
lfuse:w:0xE2:m
-U
hfuse:w:0x5F:m
-U
efuse:w:0xFF:m
-U
lock:w:0xFF:m
-vvvv
-Pusb -B5
avrdude: usbdev_open(): Found USBtinyISP, bus:device: bus-0:\.\libusb0-0001–0x1781-0x0c9f
avrdude: Error: Invalid -P value: ‘usb -B5’
Use -P usb:bus:device
Must be in separate newlines.
Also -Pusb might actually be optional.
I tested the simple sketch again and it fails too on upload so I think I need a few more Tinys.
#include <Arduino.h>
void setup()
{
Serial.begin(9600);
}
void loop()
{
Serial.println("Test"); delay(500);
}When you use the Arduino IDE with the GitHub - SpenceKonde/ATTinyCore: Arduino core for ATtiny 1634, 828, x313, x4, x41, x5, x61, x7 and x8 and choose USBtinyasp as your programmer, is it also not possible to upload via “Upload using programmer”?
OK, i made a High Voltage Programmer PCB and tested three suspected TTiny85s and they were all good. I resumed my test with the I2C_Scanner sketch with one OLED display wired up and I get a lot of garbled output on serial monitor. I’ve set monitor speed to 9600 in the source and in platformio.ini.
I measured the voltages and GND-SCL = 3.8V, GND-SDA = 2.1V. If I remove the display I get GND-SCL = 5V, GND-SDA = 2V. I use 4.7kΩ pullups.
I removed the SCL and SDA wires from the Sparkfun programmer and measured voltages and SCL-GND = 1.4V and SDA-GND = 4.8V. Is that a clue?
Using ATTinyCore, programmer USBTinyISP and “uploading using programmer” the sketch now uploads and runs fine.
While still trying to get the I2C_Scanner sketch to work I changed pullup resistors to 2.7kΩ and voltages change a bit: SCL-GND 4.1V and GND-SDA 2.3V but there was no improvement. What recommended voltages are looking for on the SCL and SDA pins? This is the output on the serial monitor.
They must be pulled up to the supply voltage. If they’re not, something is either driving them low or the resists are not working correctly.
It’s either reading noise, or at the wrong baud rate, which might again indicate a wrong fuse setting for crystal / clock frequency
OK, I replaced the OLED with a 16x2 display and now the SCL-GND=5V and SDA-GND=2V. The display lights up during upload and it looks promising but another error came up. I have now added a 10kΩ resistor Vcc - Reset.
avrdude: 3670 bytes of flash written
avrdude: verifying flash memory against .pio\build\attiny85\firmware.hex:
avrdude: load data flash data from input file .pio\build\attiny85\firmware.hex:
avrdude: input file .pio\build\attiny85\firmware.hex contains 3670 bytes
avrdude: reading on-chip flash data:
Reading | ################################################## | 100% 7.43s
avrdude: verifying ...
avrdude: verification error, first mismatch at byte 0x0000
0x00 != 0x4a
avrdude: verification error; content mismatch
avrdude: safemode: lfuse changed! Was 62, and is now 0