Adjust GPIO settings and add some test code
Adjust GPIO settings and add some test code

PUCSIE-embedded-course/stm32f4-examples,shengwen1997/stm32_pratice,shengwen1997/stm32_pratice,PUCSIE-embedded-course/stm32f4-examples,PUCSIE-embedded-course/stm32f4-examples,PUCSIE-embedded-course/stm32f4-examples,PUCSIE-embedded-course/stm32f4-examples,PUCSIE-embedded-course/stm32f4-examples,PUCSIE-embedded-course/stm32f4-examples,shengwen1997/stm32_pratice,shengwen1997/stm32_pratice