T113: Python 3.5 Package Cross-Compile

[dazb3]

大家好，
在 Tina Linux 中，我尝试安装适用于 Python 3.5 的 spidev Python 包。它不包含在 SDK make menuconfig 中
我一直在尝试交叉编译，但到目前为止还没有成功。
有人可以提供有关如何安装 Python 包的建议或说明吗？
谢谢！

Hi all,
In Tina Linux, I'm trying to install the spidev Python package for Python 3.5. It's not included in the SDK make menuconfig
I've been trying to cross compile, but so far I've had no success.
Can anyone provide advice or instructions on how to install a Python package.
Thank you!

[zoenggit]

more details will help.
I'm not sure but if you are using builtroot, python-spidev should be the package?

like this:
https://gerrit.cesnet.cz/plugins/gitiles/github/buildroot/buildroot/+/63d0762ab72a3536ea2e07ac75327c7556ed72c1/package/python-spidev/

[dazb3]

@zoenggit appreciate the response and link. I'm using the Tina Linux 2.0 SDK, which is based on OpenWRT. I'm using the Tina Linux build downloaded from this forum.

I believe the packaging system is a bit different to buildroot. I did attempt to include the spidev package in the build system, but couldn't figure how to make it work.

Do you have any experience or advice in how to get it to work?

[zoenggit]

@dazb3

chatgpt suggested no python-spidev is included by default, and should check python before add python-spidev.

3. Install python-spidev

python-spidev is usually not included directly in OpenWRT feeds, but it can be compiled from source as part of the build.

First, check for python3:

./scripts/feeds install python3

following is a link include python-spidev package by OnionIoT, switch to the right branch which matches tina sdk openwrt version:
https://github.com/OnionIoT/OpenWRT-Packages

[dazb3]

@zoenggit Many thanks for your suggestion and link. Using it, I was able to figure out how to edit the makefile to get spidev to correct build.

I created folder tina-d1-h/package/lang/python3-spidev, and in it I create Makefile. Below is the Makefile:

# Copyright (C) 2017 Onion Corporation
#
# Author: Lazar Demin  <lazar@onion.io>
#
# This is free software, licensed under the GNU General Public License v2.
# See /LICENSE for more information.
#

include $(TOPDIR)/rules.mk
PKG_NAME:=python-spidev
PKG_VERSION:=4.0.1
PKG_RELEASE:=2


PKG_SOURCE_PROTO:=git
PKG_SOURCE_VERSION:=HEAD
PKG_SOURCE_URL:=https://github.com/OnionIoT/python-spidev.git
PKG_SOURCE_SUBDIR:=$(PKG_NAME)
PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION)-$(PKG_RELEASE).tar.gz
PKG_BUILD_DIR:=$(COMPILE_DIR)/$(PKG_NAME)

include $(BUILD_DIR)/package.mk

# python module package
define Package/python3-spidev
	SECTION:=lang
	CATEGORY:=Languages
	SUBMENU:=Python
	TITLE:=Python3 module with object that implements SPI transactions
	DEPENDS:=+python3
endef

define Package/python3-spidev/description
Python3 module with object that implements SPI transactions
endef


TARGET_CFLAGS += $(FPIC)
TARGET_LIBS += -l m

PYTHON3_VERSION = 3.5
TARGET_PYTHON3_INC += "-I$(STAGING_DIR)/usr/include/python$(PYTHON3_VERSION)/"

define Build/Compile	
	$(MAKE) -C $(PKG_BUILD_DIR) wipe
	
	$(MAKE) -C $(PKG_BUILD_DIR) \
	CC="$(TARGET_CC)" \
	CFLAGS="$(TARGET_CFLAGS)" \
	LDFLAGS="$(TARGET_LDFLAGS)" \
	LIB="$(TARGET_LIBS)" \
	PYTHON_VERSION="$(PYTHON3_VERSION)" \
	PYINC="$(TARGET_PYTHON3_INC)"
endef

define Package/python3-spidev/install
	# install the python module
	$(INSTALL_DIR) $(1)/usr/lib/python$(PYTHON3_VERSION)
	$(CP)   $(PKG_BUILD_DIR)/lib/python$(PYTHON3_VERSION)/spidev.so $(1)/usr/lib/python$(PYTHON3_VERSION)
endef

$(eval $(call BuildPackage,python3-spidev))

I then included the package in "make menuconfig". Then I did make, and it seems that I do now have the spidev package!

Many thanks for your assistance!