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MCU interface to flash via SPI
Moderators: Ajay Bhargav, Arun Kumar V, pdi33, Shailesh NAYAK, ۞ TPS ۞, shyam, sashijoseph, ExperimenterUK, DavesGarage
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GVashist
Sun Jun 14 2009, 01:46PM
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hey

I am currently working on a project involving getting data from a source, coverting it to digital via ADC, and sending it to a flash via an SPI interface. also, the MCU sleeps for a set amount of time, wakes up, does the above mentioned job and goes back to sleep
i wrote some part of the code anf it works fine until the SPI part. it sleeps, wakes up, fetches data to adc, converts, writes onto a UART(debugging feature as of now). but its also supposed to write to the SPI.
i havent programmed the flash yet(no init of flash done)
but i have done the SPI bit until it reaches the interface. now, i must be able to see the SCLK right? i dont. i really cant figure out wats wrong.
i have attached the files. i really want some help fast.
the datasheets can be found here.
https://www.silabs.com/Support%20Documents/TechnicalDocs/C8051F93x-92x.pdf
http://www.winbond.com/NR/rdonlyres/93A5FE5A-EEF2-417B-87A8-CB8144F6120D/0/W25X10A_W25X20A_W25X40A_W25X80A.pdf
i will be online so any questions, please ask me.
also, any suggestions will help, i can try it out right away and let u know

thank you
adc_spi_sleep_withled.rar
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Ajay Bhargav
Tue Jun 16 2009, 05:32AM
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are you able to write in SPI memory without going power down?

Have you selected CKPHA and CPOL bits correctly?

your code is big enough and takes time to read & understand so we will drill down to the problem with your observations on code. ok?
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Ajay Bhargav
Tue Jun 16 2009, 05:34AM
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[Topic moved to 8051 Discussion forum]
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Tech350
Tue Jun 16 2009, 05:59AM
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Hi,

I'm working on a similar project. I'm using a SD card and using SPI to communicate. I have failed in even trying to initialize the SD. I want to intialize and format it in FAT16 or FAT32. If any advice or info please help me :-s

Thanks in advance.
In my case a program is something which always converts data into error messages!!
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GVashist
Tue Jun 16 2009, 08:08AM
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are you able to write in SPI memory without going power down?

i dont think so. i checked the ports 0.0 to 0.3. at 0.0 i'm supposed to get the clock - no clock. and the other pins are at their original voltages.

about the ckpha and ckpol bits, let me check that up. thanks for the advice.

@Tech350: this is the1st time i'm using spi too. there are a bunch of links from spansion and sst regarding spi for flash. hope they help.
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Tech350
Tue Jun 16 2009, 09:52PM
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@GVashist - I'v used SPI for other applications like DAC before successfully but no luck with SD. Well if any info on basic initialization sequence would be helpful. Will update my progress and post if I have any improvement.
In my case a program is something which always converts data into error messages!!
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Ajay Bhargav
Thu Jun 18 2009, 06:58AM
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I have used RD2 in both SPI slave and master configuration, and all worked great.

@Tech350, post your program in a separate thread, i will look for the problem.
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GVashist
Thu Jun 18 2009, 08:52AM
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hey. i got rid of the interrupt and instead took to polling. it works great on my development kit.
but when i put it on the custom board i built, it just goes haywire.
it works intermittently, and sometimes doesnt work at all. have i missed something.
i have attached the new files and the schematic of the new board
mcu_schematic_rev02_03252009.pdf
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GVashist
Thu Jun 18 2009, 08:53AM
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here is the new code.

regards
adc_sleep_spi.rar
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