I am fully recompiled all Omega firmware, now my kernel have all spi drivers:

root@Omega-3079:/# lsmod | grep spi
regmap_spi              1274  0
spi_bitbang             2661  1 spi_gpio
spi_gpio                5424  0
spidev                  6336  0

I also successfully compiled driver spi-gpio-driver-master using some additional required files from firmware sources. For example, onion-debug.h was found in i2c-exp-driver, etc.
After spi-gpio-driver-master compile I have spi-tool utility, libonionspi.so and python onionSpi.so module.

But I don't see soft-spi device in /dev:

root@Omega-3079:~# ls -l /dev/spi*
crw-------    1 root     root      153,   0 Dec  6 16:29 /dev/spidev0.1

/dev/spidev0.1 -- hardware SPI, used python3-spidev driver.
But spi-tool utility, libonionspi.so and python onionSpi.so used /dev/spidev%d.%d device too.

As I think spi_gpio driver should create some other device in /dev. May be I should run some "activate procedure" for spi_gpio kernel driver?
Or https://github.com/OnionIoT/spi-gpio-driver too old and it cannot work with some latest Omega's Linux kernels?

dmesg outputs only hardware /dev/spidev0.1:

root@Omega-3079:/# dmesg | grep spi
[    0.371163] spi-mt7621 10000b00.spi: sys_freq: 193333333
[    0.382341] m25p80 spi0.0: mx25l25635e (32768 Kbytes)
[    0.387589] 5 fixed-partitions partitions found on MTD device spi0.0
[    0.394049] Creating 5 MTD partitions on "spi0.0":
root@Omega-3079:/#

any other spi device does not create.

Hello.

I need to install and use spi-gpio-driver from https://github.com/OnionIoT/spi-gpio-driver/. But when I trying to compile it I got error:

root@Omega-3079:~# cd spi-gpio-driver-master/
root@Omega-3079:~/spi-gpio-driver-master# make
CC: gcc
CCFLAGS:
LDFLAGS:
LIB:
INC: -I include
SOURCES: src/onion-spi.c
OBJECTS: build/onion-spi.o
 gcc -g  -I include  -c -o build/onion-spi.o src/onion-spi.c
In file included from src/onion-spi.c:1:0:
include/onion-spi.h:21:25: fatal error: onion-debug.h: No such file or directory
compilation terminated.
make: *** [makefile:71: build/onion-spi.o] Error 1
root@Omega-3079:~/spi-gpio-driver-master#

I also tried to install spi-gpio kernel module, but it is not installed:

root@Omega-3079:/# opkg install kmod-spi-gpio
Installing kmod-spi-gpio (4.14.81-1) to root...
Downloading http://repo.onioniot.com/omega2/packages/core/kmod-spi-gpio_4.14.81-1_mipsel_24kc.ipk
Collected errors:
 * satisfy_dependencies_for: Cannot satisfy the following dependencies for kmod-spi-gpio:
 *      kernel (= 4.14.81-1-4d99ecc9745adb4d8a275d8e3a38961b) *         kernel (= 4.14.81-1-4d99ecc9745adb4d8a275d8e3a38961b) *
 * opkg_install_cmd: Cannot install package kmod-spi-gpio.
root@Omega-3079:~/spi-gpio-driver-master# opkg list-installed | grep kernel
kernel - 4.14.81-1-10b6683764d58480e54ef73aa783b9bb

What package provide these include files?
How to use soft spi on Omega2+ in python3? I need to use this driver from C program too.

My firmware is:

root@Omega-3079:~/spi-gpio-driver-master# oupgrade -v
> Device Firmware Version: 0.3.2 b233

Thanks.

@Lazar-Demin said in How to work with Omega2+ SPI correctly?:

@Pavel--Negrobov Any reason why you're sending the data back from the STM to the Omega over SPI?

STM32 on target device will have it's own USB Flash, user can select .bmp file from it. Processing algorithms are same as for bmp files uploaded by web. I want to transfer file from STM to Omega for precesssing.

Hi to all.
My device will contain Onion Omega2+ and STM32. I need to transfer big amount data (~50MB - processed .BMP files uploaded via web) from Omega to STM32. Also STM32 can transfer similar files from his USB flash to Omega for same processing.
So I need a fast link between them. Now I am trying to use SPI for this. And have some difficulties with him.
For development purposes I connect STM32F042 (SPI slave) to Omega2 (SPI Master) by 4 wires: nCS, SCK, MISO, MOSI.
STM32 firmware simply echoes received bytes to UART (to PC for monitoring) and back to SPI (Omega should receive this bytes):

    uint8_t val = 0x00;
    while ( 1 )
    {
    	// PA4 -- nCS
    	while ( GPIO_ReadInputDataBit ( GPIOA, GPIO_Pin_4 ) == Bit_SET );

    	val = bbb = spi1_sendbyte ( val );
    	usart2_PutByte ( bbb );
    } // while

In Omega I using python3.6 and python-spidev driver.
SPI int code:

        ## instantiate the spi object
        # for Omega2 firmware v0.3.0 and up:
        self._spi = spidev.SpiDev ( 0, 1 )
        # for older firmware:
        # spi = spidev.SpiDev(32766,1)
        # set the speed
        self._spi.max_speed_hz = speed_hz
        # SPI mode - CPOL|CPHA
        # 0b01: CPOL==0, CPHA==0
        self._spi.mode = 0b00
        self._spi.bits_per_word = 8
        self._spi.lsbfirst = False          # MSB first
        self._spi.cshigh = True

SPI now works at 24MHz (max for STM32F042 chip).
If I send data via xfer function data:

Send to SPI:
00000000: 48 65 6C 6C 6F 20 66 72  6F 6D 20 4F 6D 65 67 61  Hello from Omega
00000010: 32 20 53 50 49 0D 0A                              2 SPI..
Read from SPI:
00000000: 00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  ................
00000010: 00 00 00 00 00 00 00                              .......
OK

If xfer3:

Send to SPI:
00000000: 48 65 6C 6C 6F 20 66 72  6F 6D 20 4F 6D 65 67 61  Hello from Omega
00000010: 32 20 53 50 49 0D 0A                              2 SPI..
Read from SPI:
00000000: 05 00 00 00 00 00 10 33  00 00 00 36 10 00 00 00  .......3...6....
00000010: 33 30 19 00 00 00 00                              30.....
OK

I received some trash and Windows terminal on PC shows zero byte after each data byte: H<0>e<0>l<0>l<0>0 ....
May be this happens due to half-duplex Omega's SPI?
How to work correctly with SPI? Is there FULL SPI example instead some pieces of code at https://github.com/OnionIoT/python-spidev

Thanks.