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 !
Matt007 said:I wanted to use 4 data lines for MicroSD
For that, you need an SDIO peripheral, not QSPI - don't you?
I am not so sure about that. STM uses the term SDIO. ADI does not use this term. In the ADI description I found the hint: "In quad mode data transmit the SPI_MISO, SPI_D2, and SPI_D3 signals are also outputs. In quad mode data receive, the SPI_MOSI, SPI_D2, and SPI_D3 signals are also inputs.There are signal names there like:SPI0_CLKSPI0_D2SPI0_D3SPI0_MISOSPI0_MOSISPI0_SEL1SPI0_SEL2SPI0_SEL3SPI0_SSDont you think this type of "quad mode" could be used here for MicroSD?
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).
"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.