I have 4 transformers in my dac as they supply separated dc voltages to different parts. No opamps. Several Salas regs. The important +5v "analogue" line is supplied from the heater output of an R-core designed for valve preamp duties. Compared at least half a dozen transformers for this spot and R-core beat them all.
Hehehe ...stupid google robot don't speek well hungarian, does not know conjunction.
"1,2 -meg összerakható volt 2,4ohmokból."
"and the 1,2 can be put together from 2,4"
Thanks for your reply, i have bigger problem than transformers now. 🙂 I cant get sound from dac.
Actually i dont have any spdif module in hand, maybe i will try with raspberry pi generic connection..
If it was me I would replace the 2 6800uf caps to Nichicon Super Through,
Gold Tune or Mundorf M Lytic. What's the logic, well it just sounds better
Hi everyone,
I’m afraid I just messed up my dam1021 rev5
It had firmware 1.19 running and I wanted to update to 1.24
I’m running raspiOS (moOde audio player) and couldn’t get the serial connection to work and sent the file. In the end I could and it seemed to work but I got a few retries until the max retries ended the update proces. uManager than hanged so I rebooted the DAC
Now when I connect to serial I get Connected but after +++ no more uManager. It also not locks to music. I rebooted several times but I’m afraid I bricked it.
Any help would be greatly appreciated. Is there a way to reset back to factory settings or anything ??
Kind regards
Maikel
I’m afraid I just messed up my dam1021 rev5
It had firmware 1.19 running and I wanted to update to 1.24
I’m running raspiOS (moOde audio player) and couldn’t get the serial connection to work and sent the file. In the end I could and it seemed to work but I got a few retries until the max retries ended the update proces. uManager than hanged so I rebooted the DAC
Now when I connect to serial I get Connected but after +++ no more uManager. It also not locks to music. I rebooted several times but I’m afraid I bricked it.
Any help would be greatly appreciated. Is there a way to reset back to factory settings or anything ??
Kind regards
Maikel
Why can't people read, where you get rev 1.24 firmware it says "only for dam1021 rev7"....
Try using the isolated TTL serial port on J3.
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No. rev 1.21 should work as they used to do, it's only for the rev7 board there was some change in serial port handling....
You can always force the FPGA firmware to not load by shorting pins on the serial flash shortly at power up, it's U38 pin 5 and 8. You should then enter uManager directly and you can download the firmware as normal.
Oh man. I’m so happy to read this. The dam is buildin a case on the bottom so I’ll try somewhere coming days and report back
Thanks for your quick reply!!
Soren,
Could you confirm that I have the right pins? (Before I mess up more)
According to data sheet wo bond w25q80
Dam1021 is rev5
Thanks a lot
@soekris
I tried your suggestion but cannot get it to work. Looks like the serial flashis not reset and I cannot enter uManager
I did not powerdown the board after reset but i did turned on the rapberry pi (and therefore I2S connection) after the reset. I guess that should not be a problem or is it?
What am I doing wrong?
I tried your suggestion but cannot get it to work. Looks like the serial flashis not reset and I cannot enter uManager
I did not powerdown the board after reset but i did turned on the rapberry pi (and therefore I2S connection) after the reset. I guess that should not be a problem or is it?
What am I doing wrong?
Don't know exactly what you are doing.... To not load the FPGA firmware, you just short those two pins while powering up the dam1021. Then the uManager should enter directly, if not the uC firmware might have been damaged....
Me neither, the whole serial stuff is way too complicated. But I realize it's just the way it is and probably has advantages too.
Anyway I wanted to update the firmware, filters, everything in the dam1121 firmware and filters rev 1.21.skr
Somehow communication wasn't good and I got a few "Retry 0: NAK on sector" with a message maximum reties reached.
I'm honestly not sure if i updated or not but after turning off and on the DAM I could not reach it anymore. Locking led keeps flashing when feeding it music. It's connected through I2S.
Let's at least make sure I can ever use it again...
I connected it through isolated serial J3, according to my old documentation.
This is my gpio readall;
Code:
pi@moode:~ $ sudo gpio readall
+-----+-----+---------+------+---+---Pi 2---+---+------+---------+-----+-----+
| BCM | wPi | Name | Mode | V | Physical | V | Mode | Name | wPi | BCM |
+-----+-----+---------+------+---+----++----+---+------+---------+-----+-----+
| | | 3.3v | | | 1 || 2 | | | 5v | | |
| 2 | 8 | SDA.1 | ALT0 | 1 | 3 || 4 | | | 5v | | |
| 3 | 9 | SCL.1 | ALT0 | 1 | 5 || 6 | | | 0v | | |
| 4 | 7 | GPIO. 7 | IN | 1 | 7 || 8 | 1 | ALT0 | TxD | 15 | 14 |
| | | 0v | | | 9 || 10 | 0 | ALT0 | RxD | 16 | 15 |
| 17 | 0 | GPIO. 0 | IN | 0 | 11 || 12 | 0 | ALT0 | GPIO. 1 | 1 | 18 |
| 27 | 2 | GPIO. 2 | IN | 0 | 13 || 14 | | | 0v | | |
| 22 | 3 | GPIO. 3 | IN | 0 | 15 || 16 | 0 | IN | GPIO. 4 | 4 | 23 |
| | | 3.3v | | | 17 || 18 | 0 | IN | GPIO. 5 | 5 | 24 |
| 10 | 12 | MOSI | IN | 0 | 19 || 20 | | | 0v | | |
| 9 | 13 | MISO | IN | 0 | 21 || 22 | 0 | IN | GPIO. 6 | 6 | 25 |
| 11 | 14 | SCLK | IN | 0 | 23 || 24 | 1 | IN | CE0 | 10 | 8 |
| | | 0v | | | 25 || 26 | 1 | IN | CE1 | 11 | 7 |
| 0 | 30 | SDA.0 | IN | 1 | 27 || 28 | 1 | IN | SCL.0 | 31 | 1 |
| 5 | 21 | GPIO.21 | IN | 1 | 29 || 30 | | | 0v | | |
| 6 | 22 | GPIO.22 | IN | 1 | 31 || 32 | 0 | IN | GPIO.26 | 26 | 12 |
| 13 | 23 | GPIO.23 | IN | 0 | 33 || 34 | | | 0v | | |
| 19 | 24 | GPIO.24 | ALT0 | 0 | 35 || 36 | 0 | IN | GPIO.27 | 27 | 16 |
| 26 | 25 | GPIO.25 | IN | 0 | 37 || 38 | 0 | ALT0 | GPIO.28 | 28 | 20 |
| | | 0v | | | 39 || 40 | 0 | ALT0 | GPIO.29 | 29 | 21 |
+-----+-----+---------+------+---+----++----+---+------+---------+-----+-----+
| BCM | wPi | Name | Mode | V | Physical | V | Mode | Name | wPi | BCM |
+-----+-----+---------+------+---+---Pi 2---+---+------+---------+-----+-----+I reset the flash serial, then start up the pi and try to connect
with cu;
Code:
cu -l /dev/ttyAMA0 -s 115200with screen;
Code:
screen /dev/ttyAMA0It's not responding to +++ or anything else I type
Questions:
* Should I solder on a few small wires to connect to pin 5 and 8 (I assume I have the right ones?) so i can reset the U38 without disconnecting/connecting the pi?
* Can I keep those wires connected through normal use? Or are they functioning as antennas throwing noise on the serial bus?
* Is there any command that i can execute to make sure the flash serial is in the right state now?
You should always be able to see the output from the uC, the serial TX line is connected directly to the uC, only the RX line goes though the FPGA....
If you can't see any output, you should check your serial communication, up to putting a scope on the TX line....
If not, you might have messed up the uC firmware and need to reprogram it. That require the tools from ST Microelectronics....