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littlefs-project / littlefs

A little fail-safe filesystem designed for microcontrollers
BSD 3-Clause "New" or "Revised" License
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SPI Implementation for STM32L151 board. Do you have any drivers for SPI? #196

Closed KRekha3 closed 5 years ago

KRekha3 commented 5 years ago

i am using stm32l1xx_hal_spi.c in my project.
I want to establish a communication between STM32L151 MCU and External flash memory using single SPI i.e 1 SI, 1 SO pin. I could not find any example code. Please suggest.

geky commented 5 years ago

The best resource on this would be the external flash's datasheet, it should document the opcodes you need to send over SPI for erasing/programming/reading: http://www.macronix.com/Lists/Datasheet/Attachments/7478/MX25R2035F,%20Wide%20Range,%202Mb,%20v1.6.pdf

It may be useful to look at mbed's SPI driver, though the abstractions may make it a bit difficult to read: https://github.com/ARMmbed/spif-driver/blob/78c4f98b808e86c50fe74f696ea8732d03e0b16b/SPIFBlockDevice.cpp#L274

I've also seen this guy before, may be useful, though I haven't had a chance to use it: https://github.com/pellepl/spiflash_driver

KRekha3 commented 5 years ago

Thank you ..I will take a look