mcp23008 package

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Introduction

The mcp23008 software package is a software package developed by XiaojieFan for the I2C parallel port expansion circuit MCP23008. Using this software package, you can use the device on RT-Thread very conveniently .

This article mainly introduces the use of the package, API, and MSH test commands.

Directory Structure

mcp23008
│ README.md // package description
│ mcp23008.c // source file
│ mcp23008.h // header file
│ mcp23008_sample.c // Sample code for software package
│ SConscript // RT-Thread default build script
│ LICENSE // License file

License

mcp23008 complies with the Apache-2.0 license, see the LICENSE file for details.

Dependence

• RT_Thread 3.0+
• i2c device driver

method of obtaining

To use mcp23008 package, you need to select it in the package management of RT-Thread. The specific path is as follows:

RT-Thread online packages
    peripheral libraries and drivers --->
        mcp23008: Remote 8-bit I/O expander for I2C-bus --->

Enter the configuration menu of the mcp23008 software package for specific configuration according to your needs

    --- mcp23008: Remote 8-bit I/O expander for I2C-bus
        [*] Enable mcp23008 sample
           Version (latest) --->

Enable mcp23008 sample: Enable mcp23008 sample

After the configuration is complete, let the RT-Thread package manager automatically update, or use the pkgs --update command to update the package to the BSP.

Instructions

The use process of mcp23008 software package is generally as follows:

1. Initialize mcp23008 device mcp23008_init
2. Perform IO operations
   • Use API mcp23008_port_read/mcp23008_port_write to operate 8 channels of IO at the same time
   • Use API mcp23008_pin_read/mcp23008_pin_write to operate one of the IOs separately

For detailed usage, please refer to mcp23008 sample program.

MSH Test Command

If the sample program of the mcp23008 software package is enabled, the command mcp23008_sample will be exported to the console. After the call, it will detect the MCP23008 device with the address of 0x20 on the i2c1 bus by default, and will operate the port 0 of the expansion port for testing. The results are as follows:

msh >mcp23008_sample
[D/mcp23008] mcp23008 init done
The value of mcp23008.P0 is 0
The value of mcp23008.P0 is 1
msh>

Precautions

Nothing.

Contact information

• Maintenance: XiaojieFan
• Homepage: https://github.com/XiaojieFan/mcp23008