fix 'No homing of y-axis' bug

[gouache]

Signed-off-by: brian park gouache95@gmail.com

Requirements

CoreXY G28 Y is not working, so I fixed related bug.

Description

_CAN_HOME(Y) macro always return 0.
the reason is Y_MAX_PIN is 0, but _CAN_HOME macro check whether the pin is bigger than 0 or not.

0 is real pin number, not DISABLED.
I can check the variant.h in BIGTREE_SKR_PRO_1v1 like below.

~/.platformio/packages/framework-arduinoststm32/variants/BIGTREE_SKR_PRO_1v1/variant.h
#if STM32F4X_PIN_NUM >= 64 //64 pins mcu, 51 gpio
#define PC13 0
#define PC14 1 //OSC32_IN
#define PC15 2 //OSC32_OUT
.....

pins_BTT_GTR_V1.0.h is

//
// Limit Switches
//
#define Y_MIN_PIN                           PG9
#define Y_MAX_PIN                           PC13

so I change the comparison number to '-1' from '0'

Benefits

G28 and G28 Y works well

Related Issues

#18212

[ellensp]

got broken here https://github.com/MarlinFirmware/Marlin/pull/18150/files if your interested

[thinkyhead]

Normally we also need to check defined(MY_PIN) because undefined macros evaluate to zero. But in this case, the endstop pins are guaranteed to exist (by pins.h) so your patch is fine. My previous patch was not mindful of this fact.

[Minims]

Hi, i still have the issue with the very last commit. Compiled few minutes ago on bugfix. Is there a new issue ? Skr pro on core xy. Home x ok, home z ok, no home y

[gouache]

Hi, i still have the issue with the very last commit. Compiled few minutes ago on bugfix. Is there a new issue ? Skr pro on core xy. Home x ok, home z ok, no home y

could you share your Configuration.h & Configuration_adv.h files?

[Minims]

here it is : CoreXY-SKR-Pro.zip

[gouache]

here it is : CoreXY-SKR-Pro.zip

this patch is not for sensorless homing. please create new issue for your bug.