Arduino_core_stm32: SPI external eeprom suport

[mayurharge]

hello @fpistm ,
I want to integrate SPI based external EEPROM with STM32F103C controller, The issue is the EEPROM is not responding to SPI.h library.
I have tested the EEPROM on Arduino UNO using This Code

here they have used ATMEL specific instructions

//sample on leading edge of clk,system clock/4 rate (fastest)
  SPCR = (1<<SPE)|(1<<MSTR);
  clr=SPSR;
  clr=SPDR;

which are not supported on stm.
Please suggest the solution for this.
other details: Arduino IDE :- 1.8.0
STMCore: 1.7.0(latest).

regards,
Mayur

[fpistm]

Hi @mayurharge
your code is for UNO direct register access. I guess this example was made before API update.
You have to create your own sketch using SPI API:
https://www.arduino.cc/en/reference/SPI

Did you test some third party libraries, ex:
https://github.com/regis44/spieeprom

[mayurharge]

Okay I will Try this

[mayurharge]

I have tried the library you suggested its behaving same.
The error I am facing is
I will get random values like 0,31(32-1),127(128-1),255(256-1) if i read a particular register
I am attaching the .ino file I am using, please check.
SPI_EEPROM.zip

[fpistm]

@mayurharge
unfortunately, I'm not able to review all third party or user code and debug it.
Your code seems to be a lot of copy/paste and try and use deprecated API.
Please take time to make your code and try to debug it.

[mayurharge]

Sure

On Wed, 2 Oct, 2019, 7:55 PM Frederic Pillon, [e-mail]
wrote:

@mayurharge https://github.com/mayurharge
unfortunately, I'm not able to review all third party or user code and
debug it.
Your code seems to be a lot of copy/paste and try and use deprecated API.
Please take time to make your code and try to debug it.

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[mayurharge]

The issue is solved.
There was problem with spi speed.
After reducing the speed the communication was fine