FireWatchTower_2axis/firmware/lib/tmc/ic/MAX22216/README.md

max22216

How to use

To access the max22216's registers, the TMC-API offers two functions: max22216_readRegister and max22216_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/tmc/max22216 folder into the custom project.
2. Include the max22216.h file in the custom source code.
3. Implement the necessary callback functions (see below).
4. (optional): Take a look at the Examples subfolder for ready-made examples of the TMC-API usage.

Accessing the max22216 via SPI

The following diagram depicts how to access the max22216 via SPI using the TMC-API.

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

• The functions max22216_readRegister and max22216_writeRegister are used to read and write the registers respectively. These functions check the current active bus and calls the bus-specific function i.e readRegisterSPI or writeRegisterSPI.
• These bus specific functions constructs the datagram and further calls the bus specific callback 'tmcXXXX_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

To communicate with max22216 IC through SPI, there are two ways. One is with CRC check and the other is without CRC. For that, the callback function 'max22216_getCRCEnState()' needs to be implemented. Additionally, implement the following callback functions to access the chip via SPI:

1. max22216_readWriteSPI(), which is a HAL wrapper function that provides the necessary hardware access. This function should also set the chip select pin CSN to low before starting the data transfer and set to high upon completion. 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 the custom projects.

Example usage: TMC-Evalsystem

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

Migration status

The max22216 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.