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Dev board as a mainboard?
Hello everyone!
I'd love to build an "all protoboard" version of the lxr, but I had some doubts regarding the mainboard.
The idea was to use a cheap stm32f407 development board to avoid smd soldering,
but I noticed a few differences between the mainboard schematic available on the assembly instructions page and the new version of the board.
I was wondering if someone knew it was the same board without the ADC or if there were more changes..
Is the new schematic available anywhere here?
I found on ebay some cheap dev board (10bucks) that already offer usb connection, sd slot and 8Mhz crystal.. it would only be a matter of adding the dacs!
Another doubt on the chip: stm32f407vet6 has 512KB of flash instead of 1MB (vgt6 version), would it be enough or should I search only for the vgt6?
Thank you all in advance!!
Marco
I'd love to build an "all protoboard" version of the lxr, but I had some doubts regarding the mainboard.
The idea was to use a cheap stm32f407 development board to avoid smd soldering,
but I noticed a few differences between the mainboard schematic available on the assembly instructions page and the new version of the board.
I was wondering if someone knew it was the same board without the ADC or if there were more changes..
Is the new schematic available anywhere here?
I found on ebay some cheap dev board (10bucks) that already offer usb connection, sd slot and 8Mhz crystal.. it would only be a matter of adding the dacs!
Another doubt on the chip: stm32f407vet6 has 512KB of flash instead of 1MB (vgt6 version), would it be enough or should I search only for the vgt6?
Thank you all in advance!!
Marco
Comments
But the TOS is quite restrictive and I would not have been allowed to redistribute the boards.
Then I decided to move to my own design and added multiple audio outs and the SD card socket.
The discovery board had only a single audio out.
So in general it works, but the code has to be changed a bit.
I'd have to take another look at the source, but the driver for the discovery board DAC might still be in there.
But it is definitely not a "plug'n'Play" solution.
512kb flash is enough, the rest is only used as sample memory on my boards (which is a crude hack anyways
The discovery board I found is a chinese unbranded breakout board and offers no audio out..
http://www.ebay.it/itm/STM32F407VET6-STM32-Cortex-M4-Development-Board-Core407V-Minimum-System-Board-/122187301505?hash=item1c72ee4281:g:a6AAAOSw-CpYBbZN
http://www.ebay.it/itm/STM32F4-Discovery-STM32F407VGT6-ARM-Cortex-M4-32bit-MCU-Core-Development-Board-/122251681896?hash=item1c76c4a068:g:5nQAAOSwiDFYQRF4
Like these ones..
Your board uses 2 internal dacs and 2 external CS4344 to offer 4 audio outputs, right?
Adding 2xCS4344 would replicate that configuration, why would be necessary to modify the code?
http://www.mouser.de/ProductDetail/STMicroelectronics/STM32F407G-DISC1/?qs=/ha2pyFadui1YcVs9LwlR5Wqc4ZUxCtym584avAZKUykGi5nsHymTw==
This board only has a stereo out.
On the LXR board I use 2 external DACs to provide the 2 stereo/4mono outs.
So if you add the DACs to whatever dev board you use you don't have to modify the code, but you are back to a custom PCB layout for the SMD parts then.
I was planning to simply make a dac shield (protoboard) with those CS4344 mounted on SOP to DIP converters, to avoid producing a new pcb.
The ADC section with selection jumpers is no longer necessary, is it?
Thank you for your support!!
no jumpers are not necessary anymore.
The first boards had an ADC option with the idea to re-use the board for other projects, but in the end it seems more economic to me to make dedicated boards.
It's going to be good fun building it from scratch
Have a nice day,
Marco