Add link to porting guide in GPIO page

gpsimenos · gpsimenos · commit 0a515da9d42b · 2021-03-12T11:41:21.000Z
diff --git a/docs/porting/target/gpio.md b/docs/porting/target/gpio.md
@@ -2,4 +2,4 @@
 
 Implement the api declared in `mbed-os/hal/gpio_api.h`. You must define the struct `gpio_t`. This struct is commonly defined in an `objects.h` file within the `mbed-os/targets/TARGET_VENDOR/`, `mbed-os/targets/TARGET_VENDOR/TARGET_MCU_FAMILY` or `mbed-os/targets/TARGET_VENDOR/TARGET_MCU_FAMILY/TARGET_MCUNAME` directories.
 
-You should define the Physical LEDs and switches in the target's `PinNames.h` file. LED and switch names begin incrementing at 1 and follow the convention `LED1...LEDn` and `BUTTON1...BUTTONn`. You can see an [example](https://github.com/ARMmbed/mbed-os/blob/master/targets/TARGET_Freescale/TARGET_MCUXpresso_MCUS/TARGET_MCU_K64F/TARGET_FRDM/PinNames.h#L198) for more information.
+You should follow the standard described in the [Standard Pin Names Porting Guide](../standard_pin_names/pin_names_porting.md) to define the Physical LEDs and switches in the target's `PinNames.h` file.

Original file line number	Diff line number	Diff line change
`@@ -2,4 +2,4 @@`
`2`	`2`
`3`	`3`	Implement the api declared in `mbed-os/hal/gpio_api.h`. You must define the struct `gpio_t`. This struct is commonly defined in an `objects.h` file within the `mbed-os/targets/TARGET_VENDOR/`, `mbed-os/targets/TARGET_VENDOR/TARGET_MCU_FAMILY` or `mbed-os/targets/TARGET_VENDOR/TARGET_MCU_FAMILY/TARGET_MCUNAME` directories.
`4`	`4`
`5`		-You should define the Physical LEDs and switches in the target's `PinNames.h` file. LED and switch names begin incrementing at 1 and follow the convention `LED1...LEDn` and `BUTTON1...BUTTONn`. You can see an [example](https://github.com/ARMmbed/mbed-os/blob/master/targets/TARGET_Freescale/TARGET_MCUXpresso_MCUS/TARGET_MCU_K64F/TARGET_FRDM/PinNames.h#L198) for more information.
	`5`	+You should follow the standard described in the [Standard Pin Names Porting Guide](../standard_pin_names/pin_names_porting.md) to define the Physical LEDs and switches in the target's `PinNames.h` file.