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FireWatchTower_2axis/firmware/lib/tmc/ic/MAX22200/README.md

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MAX22200

How to use

To access the MAX22200's registers, the TMC-API offers two functions: max22200_readRegister and max22200_writeRegister. Each of these functions takes in an icID, which is used to identify the IC when multiple ICs are connected. This identifier is passed down to the callback functions (see How to Integrate).

How to integrate: overview

  1. Include all the files of the TMC-API/ic/max22200/MAX22200 folder into the custom project.
  2. Include the MAX22200.h file in the custom source code.
  3. Implement the necessary callback functions (see below).

Accessing the MAX22200 via SPI

One important thing to make sure is that the MISO pin of SPI is connected externally to the 3.3V via a 330 ohms resistor as show in the picture below.

screenshot

The following diagram depicts how to access the MAX22200 via SPI using the TMC-API.

screenshot

The description of the functions, in the above flowchart, are as follows:

  • The functions max22200_readRegister and max22200_writeRegister are used to read and write the registers respectively. These functions check the current active bus and call the bus-specific function i.e readRegisterSPI or writeRegisterSPI.
  • These bus specific functions construct the datagram and further call the bus specific callback 'max22200_readWriteSPI'.
  • This callback function further calls the hardware specific read/write function for SPI and needs to be implemented externally.

How to integrate: Callback functions

Implement the following callback functions to access the chip via SPI:

  1. max22200_readWriteSPI(), which is a HAL wrapper function that provides the necessary hardware access. This function should also set the CMD pin to high for writing a register and set it low for reading a register. Please refer to the datasheet of the IC for further details.

Further info

Dependency graph for the ICs with new register R/W mechanism

This graph illustrates the relationships between files within the TMC-API library, highlighting dependencies and identifying the files that are essential for integrating the library into custom projects.

screenshot

Example usage: TMC-Evalsystem

For a reference usage of the TMC-API, visit the TMC-Evalsystem

Migration status

The MAX22200 has been reworked to the access system described above. For more infos on the status of this and other ICs, check out the migration page.