performer (or is it per|former?) sequencer build

[dlavila]

if you built the performer yourself maybe you have a programmer, you could try reading the memory of the MCU

[sduck]

Ok, fixed - attached the programmer, reflashed the bootloader, it started right up like nothing had ever happened.

Thanks cnicht and diavila for your help!

[cnicht]

Excellent!

Intrigued to know why the microcontroller ‘lost’ its memory?

[gbiz]

It only takes one corrupted bit in a vector, jump or branch address in the program code to have the MCU executing from an invalid location.

[cnicht]

Possibly a cosmic ray event?

[gbiz]

I've never heard of them flipping a bit in flash memory (this is permanent as it persists across reboots). I know it used to be an issue with dram, less so now as a lot of that has ecc.

[sduck]

The performer sits in the middle of the bottom row of my fairly large cabinet - 6 rows of 168hp each. So what happens a lot in the frenzy of patcing is that loose patch cords, or ones with just one end connected, fall onto the bottom row. It's possible maybe one of those was putting out some kind of voltage, while lying touching something on the performer, maybe while it was being powered on or something, and somehow that zapped it. I don't know, just guessing.

[cnicht]

Occam’s Razor

[cathmart]

'm having a small problem with a PER|FORMER sequencer build. There is only 2.3v going to the screen, so it doesn't work. Ive checked around the 3.3v net but some of the points are 3.3v and some 2.3v. I cant find the root of the problem? any ideas? electrolytic caps? the LM1117's the 3 leg side is 3.3v the big leg is 2.3v. I've changed them for new ones, no change. Triple checked they are 3.3v that I ordered.
Photo attached - red dots are 2.3v green dots are 3.3v.

[cnicht]

Is the DC-DC converter supplying 5V?

[cathmart]

YES! that's it - putting out 3.3v. its the wrong one...I need a 5v one. thank you so much.

[cnicht]

It’s always a good idea to place the power supply components and check the voltage rails first before placing the rest of the components.

The Build Guide for the Performer outlines this strategy.

[cathmart]

It’s always a good idea to place the power supply components and check the voltage rails first before placing the rest of the components.

The Build Guide for the Performer outlines this strategy.

YES, I got overconfident and just checked a few, thinking that all was well. And the fact it booted up first time. BUT! its a lesson, check as instructed.

[jackpf]

Ack. My performer has been working perfectly for like a year or more now. Today, powered it on and...
IMG_3186.JPG
That particular array of pixels is static by the way, no movement. Is my screen dead? Or worse? Ack.

Oh my god, same thing happened to me just now - it's been working fine for months and then boom.
IC voltages were fine, went to try a reflash and ST-Link wasn't detecting it at all, had no idea what to do so came here to check this thread!

Turns out I had a bad connection to the JTAG header, I must've screwed it up when I was fixing a loose connection to the SD card slot.
Fixed the pin, reflashed and everything is working again. phew

[cnicht]

It’s always a good idea to place the power supply components and check the voltage rails first before placing the rest of the components.

The Build Guide for the Performer outlines this strategy.

YES, I got overconfident and just checked a few, thinking that all was well. And the fact it booted up first time. BUT! its a lesson, check as instructed.

Let us know that all is well when you swap the DC-DC converter?

[bentonp]

Hi everyone, hope you're safe and well.

I'm just wondering if anyone has flashed the Per|former using JP6?
I bought an ST-Link V2 but don't have the JP4 JTAG cable.

Regards,

Benton

[Altitude909]

youll need that regardless to flash the bootloader. serial upload still requires a bootloader in place

[bentonp]

youll need that regardless to flash the bootloader. serial upload still requires a bootloader in place

Thanks, I understand. Do you know if there's a cable from the 10 pin normal header to the 10 pin mini header?

[cnicht]

https://www.mouser.co.uk/ProductDetail/ ... gIufPD_BwE

[bentonp]

Thanks! I just ordered the original ST-LINK/V2 and the ARM-JTAG-20-10 adapter from Mouser plus an additional OLED display this time Blue. The header pins were too long bent the display and broke. Will post my built when manage to flash it. Regards

[jackpf]

Hi all, I've seen it mentioned before but wonder if anyone has any new solutions -
The performer's screen makes an audible hum and causes interference with other modules. It's not noticeable with proper gain staging, but still a little annoying.

I am using a switching power supply, and found that if I power the performer from my (linear) bench power supply, the problem seems to go away.

But before I splash out on a linear supply for the modular, has anyone had any success in reducing this noise somehow? I'm a hardware noob so any suggestions welcome

[KittenVillage]

Hi all, I've seen it mentioned before but wonder if anyone has any new solutions -
The performer's screen makes an audible hum and causes interference with other modules. It's not noticeable with proper gain staging, but still a little annoying.

I am using a switching power supply, and found that if I power the performer from my (linear) bench power supply, the problem seems to go away.

But before I splash out on a linear supply for the modular, has anyone had any success in reducing this noise somehow? I'm a hardware noob so any suggestions welcome

I'm just spitballing, but the PreenFM2 had a lot of issues with a similar display. So much so that there's guides as to how to fold an aluminum foil shield for it. There are also discussion on the forums for it about replacing a part on the display to help with the noise. (Sorry if this isn't too helpful.)

[jackpf]

Hi all, I've seen it mentioned before but wonder if anyone has any new solutions -
The performer's screen makes an audible hum and causes interference with other modules. It's not noticeable with proper gain staging, but still a little annoying.

I am using a switching power supply, and found that if I power the performer from my (linear) bench power supply, the problem seems to go away.

But before I splash out on a linear supply for the modular, has anyone had any success in reducing this noise somehow? I'm a hardware noob so any suggestions welcome

I'm just spitballing, but the PreenFM2 had a lot of issues with a similar display. So much so that there's guides as to how to fold an aluminum foil shield for it. There are also discussion on the forums for it about replacing a part on the display to help with the noise. (Sorry if this isn't too helpful.)

Oh no, that's very useful, thanks! I guess this is the thread you're referring to: https://ixox.fr/forum/index.php?topic=69159.0

I don't know if the noise is caused by electrical or magnetic interference (my guess would be electrical since using linear supply solves the problem), but I guess i can test by hooking up the screen with some jumper cables and have it far away from the module, and see if the noise still occurs.

I don't quite understand the bit about adding the resistor & connecting pin 2 & 15 though - on the datasheet pin 15 is "no connect". Could anyone with greater technical skills than me confirm if this is a good idea or not?

[KittenVillage]

Hi all, I've seen it mentioned before but wonder if anyone has any new solutions -
The performer's screen makes an audible hum and causes interference with other modules. It's not noticeable with proper gain staging, but still a little annoying.

I am using a switching power supply, and found that if I power the performer from my (linear) bench power supply, the problem seems to go away.

But before I splash out on a linear supply for the modular, has anyone had any success in reducing this noise somehow? I'm a hardware noob so any suggestions welcome

I'm just spitballing, but the PreenFM2 had a lot of issues with a similar display. So much so that there's guides as to how to fold an aluminum foil shield for it. There are also discussion on the forums for it about replacing a part on the display to help with the noise. (Sorry if this isn't too helpful.)

Oh no, that's very useful, thanks! I guess this is the thread you're referring to: https://ixox.fr/forum/index.php?topic=69159.0

I don't know if the noise is caused by electrical or magnetic interference (my guess would be electrical since using linear supply solves the problem), but I guess i can test by hooking up the screen with some jumper cables and have it far away from the module, and see if the noise still occurs.

I don't quite understand the bit about adding the resistor & connecting pin 2 & 15 though - on the datasheet pin 15 is "no connect". Could anyone with greater technical skills than me confirm if this is a good idea or not?

Also check out this thread which mentions switching an inductor on the display.
http://ixox.fr/forum/index.php?topic=69470.0

[jackpf]

Hi all, I've seen it mentioned before but wonder if anyone has any new solutions -
The performer's screen makes an audible hum and causes interference with other modules. It's not noticeable with proper gain staging, but still a little annoying.

I am using a switching power supply, and found that if I power the performer from my (linear) bench power supply, the problem seems to go away.

But before I splash out on a linear supply for the modular, has anyone had any success in reducing this noise somehow? I'm a hardware noob so any suggestions welcome

I'm just spitballing, but the PreenFM2 had a lot of issues with a similar display. So much so that there's guides as to how to fold an aluminum foil shield for it. There are also discussion on the forums for it about replacing a part on the display to help with the noise. (Sorry if this isn't too helpful.)

Oh no, that's very useful, thanks! I guess this is the thread you're referring to: https://ixox.fr/forum/index.php?topic=69159.0

I don't know if the noise is caused by electrical or magnetic interference (my guess would be electrical since using linear supply solves the problem), but I guess i can test by hooking up the screen with some jumper cables and have it far away from the module, and see if the noise still occurs.

I don't quite understand the bit about adding the resistor & connecting pin 2 & 15 though - on the datasheet pin 15 is "no connect". Could anyone with greater technical skills than me confirm if this is a good idea or not?

Also check out this thread which mentions switching an inductor on the display.
http://ixox.fr/forum/index.php?topic=69470.0

Ah interesting, that makes more sense to me. Maybe it is just the unshielded inductor, I'll do some investigation. Cheers!