gpio

GPIO module notes

There are two types of GPIO module in chips supported: old-style (used in STM32F1XX) and new one (all other chips).

GPIO module supported through pin.h module. Actually pin.h module just checks selected chip and includes appropriate module. There are 3 modules:

• pin_stm32F1xx.h
• pin_stm32F4xx.h
• pin_stm32L0xx.h

First module (pin_stm32F1xx.h) implements support for old-type GPIO.

Second module (pin_stm32F4xx.h) implements new-style GPIO.

Third module (pin_stm32L0xx.h) implements new-style GPIO without using bit-band. This is due to lack of bit-band support on GPIO area in STM32L0XX chips.