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MT32-Pi works, but does not turn on OLED and is not detected!
I'm using a Raspberry Pi 3A + and the curious thing is that it's working, but the Mister doesn't detect and neither the display turns on, the detail that I noticed is that the Raspberry is heating up a lot, has anyone seen something like this? 
Code: Select all
# Select LCD driver.
#
# Note that LCDs connected via I2C, you must also set the correct address for
# your device via the i2c_lcd_address option. Consult its datasheet, or see
# our documentation for tested models and their configurations.
#
# Values: none*, hd44780_4bit, hd44780_i2c, sh1106_i2c, ssd1306_i2c
#
# none: No LCD
# hd44780_4bit: Hitachi HD44780 or compatible (e.g. WS0010, RS0010) character
# LCD connected to GPIO pins in 4-bit mode (see documentation for
# pinout)
# hd44780_i2c: As above, but using an I2C "backpack"
# sh1106_i2c: Small I2C-based OLED graphical display (usually 1.3")
# ssd1306_i2c: Small I2C-based OLED graphical display (usually 0.96")
type = ssd1306_i2c
# Set the width of the LCD.
#
# If the display is a character display, this value is measured in characters.
# Otherwise, for a graphical display, this is measured in pixels.
#
# Note that not all dimension settings are valid; see documentation for valid
# configurations for each LCD driver.
#
# Values: 20-128 (128*)
width = 128
# Set the height of the LCD.
#
# Same characters vs. pixels considerations as for width.
#
# Values: 2-64 (32*)
height = 64
# Set address (hexadecimal) of I2C LCD.
#
# This will be used to communicate with LCDs connected via the I2C bus.
#
# Values: 00-80 (3c*)
i2c_lcd_address = 3c
# Rotate the display output (graphical LCDs only).
#
# Some graphical displays support rotation. Use this option if you need to turn
# the display around.
#
# Values: normal*, inverted
#
# normal: No rotation
# inverted: The display output is upside down
rotation = normalmarcelosofth wrote: ↑Tue Dec 14, 2021 2:07 pmFriend, I correctly configured the "MT32-pi Wiki" including a friend gave me the content of his SD Card that he uses perfectly in his Mister, so the problem with the "mt32-pi.cfg" is not, follow the photo link of my I/O purchased on Aliexpress!
I don't see anything obviously wrong with that board, but I don't know if that type of IO board is known to work correctly with the MT32-pi. Have you tried using a separate power supply for the MT32-pi?
marcelosofth wrote: ↑Mon Dec 13, 2021 8:47 pmI just unzipped it to my SD card, as I said it's working
How do you know that your MT32-pi works?
Does your PSU offer enough amps to power the Raspberry Pi over the SNAC port ?
Is the USB 3.0 cable used short enough as this can cause issues ?
thisisamigaspeaking wrote: ↑Mon Dec 12, 2022 10:46 pmmarcelosofth wrote: ↑Mon Dec 13, 2021 8:47 pmI just unzipped it to my SD card, as I said it's working
How do you know that your MT32-pi works?
This is an excellent question.
OP: Continuing to insist that the MT32-Pi works, while also complaining it doesn't work, seems, er, counterproductive.
As others have suggested, the power supply is a likely source of the problem.
Malor wrote: ↑Thu Dec 29, 2022 7:14 pmthisisamigaspeaking wrote: ↑Mon Dec 12, 2022 10:46 pmmarcelosofth wrote: ↑Mon Dec 13, 2021 8:47 pmI just unzipped it to my SD card, as I said it's working
How do you know that your MT32-pi works?
This is an excellent question.
OP: Continuing to insist that the MT32-Pi works, while also complaining it doesn't work, seems, er, counterproductive.
As others have suggested, the power supply is a likely source of the problem.
Looking back over the conversation I see:
as I said it's working, I tried the AO486 and X68000, I noticed the Raspberry is too hot the little I used it and then I turned it off!
So I think perhaps it was working initially but is no longer working? Otherwise I'm not clear under what circumstances it was ever working from the conversation. I took it to mean more like "the SD card should be valid, the Pi should be working, the hat is new, so it's working!" but I'm not sure at all.
Ah, okay, I missed that.
Being really hot can be a sign of not getting enough voltage; the system then pulls more amps to try to compensate, and amperage is what makes things get hot.
Using a separate power supply for the Pi, and turning off the power switch on the hat so the current doesn't flow backward, would be a useful experiment.
I had necro'd an old thread, and it was solved in an apparent duplicate thread: viewtopic.php?t=3944