[Etherlab-users] User mode "Register" access methods

[Moebius, Volker]

Hello everyone,

The `ethercat` CLI tool implements the "Register Access" functions `reg_read` and `reg_write`. These functions are using EC_IOCTL_SLAVE_REG_READ and EC_IOCTL_SLAVE_REG_WRITE to execute these methods. (lines 433ff of tool/MasterDevice.cpp<https://gitlab.com/etherlab.org/ethercat/-/blob/stable-1.6/tool/MasterDevice.cpp?ref_type=heads#L433>)

Is there a reason why possibly corresponding methods for "Register Read" and "Register Write" aren't implemented in the "normal" user mode C API (include/ecrt.h)? Don't these methods make sense for controlling EtherCAT slaves?

I'm unfortunately not an EtherCAT expert and I'm confused about the different data objects and communication objects. Are the functions `ecrt_slave_config_create_reg_request`, `ecrt_reg_request_data`, `ecrt_reg_request_state`, `ecrt_reg_request_write` and `ecrt_reg_request_read` related to the same "Register Access" ("Slave Registers") as implemented by the CLI? Or do they manage a different kind of registers?

.
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