Hello !
OpenUAC2 project implementation on custom HW with ES9038 is on the way
The STM32 USB->I2S work, I2S signals looks good but es9038 didn't generate any signal.
I can read and write through I2C on es9038, I was surprised as the i2c address of es9038 is not 0x90/0x92 like mentioned on datasheet but 0x48 ? There is also another strange thing as the res1 register default value is not b11001100 but b10001100 ?
Clock on es9038 is good, voltage rails on es9038 looks good, I certainly miss something on es9038 init. If someone know how to simply output a analog signal with I2S data ?
OpenUAC2 project implementation on custom HW with ES9038 is on the way
The STM32 USB->I2S work, I2S signals looks good but es9038 didn't generate any signal.
I can read and write through I2C on es9038, I was surprised as the i2c address of es9038 is not 0x90/0x92 like mentioned on datasheet but 0x48 ? There is also another strange thing as the res1 register default value is not b11001100 but b10001100 ?
Clock on es9038 is good, voltage rails on es9038 looks good, I certainly miss something on es9038 init. If someone know how to simply output a analog signal with I2S data ?
These devices use 7-bit addressing (see attachment). For some reason ESS gives the address in 8-bit format in the datasheet (i.e. 0x48 << 1)
Can you list what values you use to initialize the registers?
Attachments
Oups a newbie misunderstanding!
I tried several combinaisons of registers, last try I only made a reset cycle toggling reset pin these way: L wait 10ms H.
I think it's maybe my volume control in fault :
I have binary stream on I2S bus, I see I2S_WS frequency change accordingly with Fs (ie 48ks i2s_ws=48khz, 96ks 96khz)
I comment all other functions
Success not so far
I tried several combinaisons of registers, last try I only made a reset cycle toggling reset pin these way: L wait 10ms H.
I think it's maybe my volume control in fault :
I have binary stream on I2S bus, I see I2S_WS frequency change accordingly with Fs (ie 48ks i2s_ws=48khz, 96ks 96khz)
I comment all other functions
Success not so far
That does not look right. You seem to use volume value as register id. And you really should get rid of "AK4490" stuff in code as well as namings.
I check if I have 1.2V on pin 15: ok
check pin 21 reset: high level ok
I test with a volume value of 0x0 no change
You totally right I have to get rid of all reference to ak4490r and rewrite these portion of code, I'm only doing a quick check to be sure dac is working.
Next step: will try to probe signals directly on dac qfn package but maybe not tonight, a short circuit is quickly happening at the end of a day
check pin 21 reset: high level ok
I test with a volume value of 0x0 no change
You totally right I have to get rid of all reference to ak4490r and rewrite these portion of code, I'm only doing a quick check to be sure dac is working.
Next step: will try to probe signals directly on dac qfn package but maybe not tonight, a short circuit is quickly happening at the end of a day
Yep, can read, write and read back registers.
DAC_DATA looks good streaming audio data
DAC_LRCLK is 96Khz
DAC_BCLK is around 6.144 Mhz
DAC_MCLK is 49.152Mhz (feed by stm32)
I measure those signals probing on a resistor network array, maybe solder between pads and es9038 are not good. I think about testing spdif input. Also output the lock bit /register 64 could be helpful for me, I can map on a led to see.
DAC_DATA looks good streaming audio data
DAC_LRCLK is 96Khz
DAC_BCLK is around 6.144 Mhz
DAC_MCLK is 49.152Mhz (feed by stm32)
I measure those signals probing on a resistor network array, maybe solder between pads and es9038 are not good. I think about testing spdif input. Also output the lock bit /register 64 could be helpful for me, I can map on a led to see.
Hello
Finally, it works it just work few second ago, so I have to properly understand how and why but... great!!!!
I had one issue, I used the i2c write meme function with IT this doens't works for me, I replace it with no IT it works bit7 set of reg14.
I modify these things:
and my init sequence:
I see on scope the wave is not stable, there is some issue to fix, but hw seems to be good and that was my goal for this week
Here the sinus of victory
Guys of you go skiing in my country (Grenoble/French Alps) I have some beers to share with you!
Finally, it works
it just work few second ago, so I have to properly understand how and why but... great!!!!I had one issue, I used the i2c write meme function with IT this doens't works for me, I replace it with no IT it works
bit7 set of reg14.I modify these things:
and my init sequence:
I see on scope the wave is not stable, there is some issue to fix, but hw seems to be good and that was my goal for this week
Here the sinus of victory
Guys of you go skiing in my country (Grenoble/French Alps) I have some beers to share with you
!Unstable in what way? Are you using Normal trigger mode or Auto trigger mode? Sometimes Normal mode will give a more stable display.
Unstable the way the signal generated by dac goes on/off/on/off not accurately measured that. I was on auto trigger. I have to spy i2c bus and RESETB bin to see what appends.
Also signal is noisy and very low in amplitude; I get max of +/-200mV (when I set reg15 volume register to 0x0, if I set more than 0x0 amplitude decrease accordingly this looks normal). I doubt I understand well the output stage of this dac, in first understanding I think it was a current output dac and then implement this schematic:
Opamps are powered with dual supply +5V and -5V and I need a single ended signal of max +/-1.5V peak amplitude, after I made a single ended to diff conversion as I need a diff signal for my power amp. Values of 400R for i/s stage is based upon typical current output dac of +/-3.9mA centered on a -6.2mA dc current, ex : https://mi-take.biz/system72/DAC2020/ES9038Q2M/ES9038Q2M_DAC.html
Also signal is noisy and very low in amplitude; I get max of +/-200mV (when I set reg15 volume register to 0x0, if I set more than 0x0 amplitude decrease accordingly this looks normal). I doubt I understand well the output stage of this dac, in first understanding I think it was a current output dac and then implement this schematic:
Opamps are powered with dual supply +5V and -5V and I need a single ended signal of max +/-1.5V peak amplitude, after I made a single ended to diff conversion as I need a diff signal for my power amp. Values of 400R for i/s stage is based upon typical current output dac of +/-3.9mA centered on a -6.2mA dc current, ex : https://mi-take.biz/system72/DAC2020/ES9038Q2M/ES9038Q2M_DAC.html