I am new to ARM Cortex 4 and to ADSP-CM403F. I worked with AVR stuff and was able using SD cards with SPI, AVR-GCC. I am working on a schematic for the 120pin ADSP-CM403F chip. To be able to code for MicroSD I will have to connect the right pins of the card to the CPU. Unfortunately I did not find an example yet to see if its possible using 4 data lines as SDIO offers. In the data sheet Rev. A november 2015 there are signals like SPI clock, SPI data 2, SPI data 3. I cannot see SPI data 0 or data 1.
Can anybody please give me a hint where to find an example how to add a MicroSD card (and also a QSPI flash, SRAM) to this chip including a simple C example code? Thank you very much !
Again, none of this has anything to do with ARM - and nothing to do with the GNU Toolchain!
SDIO is the interface defined by the SD Card Association:
https://en.wikipedia.org/wiki/SD_card#SDIO_cards
It is not the same as, nor a synonym, for QSPI.
https://en.wikipedia.org/wiki/Serial_Peripheral_Interface#Intelligent_SPI_controllers
The reason that most low-cost dev boards use SPI is that it allows you to use the free, simplified SD-Card protocol.
In 4-bit mode, you need the full protocol - which requires a licence (which is, presumably, paid by the silicon manufacturer and included in the chip price).
"It does sound like you'd be better off choosing a different board."If you have a helpful hint here Andy - please tell.
"Plenty of others offer 16 (and more bit) ADCs"I did not find much boards using precise 16bit ADCs like ADI does offer. Many are offering ADCs which are much compromized in accuracy by design. "I think you have a lot of basics to cover before thinking of designing PCBs"I already have a 16bit design using a Atmega2560, AD7714, MAX5717. This worked well. I then switched to Atmega32u4, AD7798, MAX5717. The PCB is there - has to be tested yet. So this ADSP-chip is just the next step. In 1986 I worked with a 10bit AD-converter in a medical device. So all this is not so new for me.
"none of this has anything to do with ARM - and nothing to do with the GNU Toolchain!"Yes ! So this is off topic here. So where should I ask?ARM is only part of the ADI chip I want to use.The GNU toolchain is part I want to use for programming registers and so on. Without a program no function at all."In 4-bit mode, you need the full protocol - which requires a licence (which is, presumably, paid by the silicon manufacturer and included in the chip price)."seems to be that ADI is using that. I do not know the difference in operation between the solution that STM uses (SDIO) and SPI with 4 data lines. I assume its similar. I can try finding out.
"I suggest that you get a copy of Joseph Yiu's Definitive Guide"thank you for this hint !
Well, yes - Analog Devices (as the name suggests) are the analogue experts.
So if that's your key requirement, that's going to have to drive your decision.
Dealing with the peripherals on an ARM chip is really no different to dealing with the peripherals on an AVR or any other microcontroller - it's all just about reading & writing registers.
"Dealing with the peripherals on an ARM chip is really no different to dealing with the peripherals on an AVR or any other microcontroller - it's all just about reading & writing registers."Yes. I know how to access a MicroSD card with one channel SPI and AVR. But I did not do yet with a 4 channel SPI. I read the data sheets of the SD card and the data sheet from ADI. But unfortunately its still not clear for me where to connect CMD to. I still search for an example. Hopefully at ADI there will be somebody willing to help here.