Question: When I use the STM32 library function to assign a value to the I/O port, I find four related functions in the header file that can do this operation. So what are the differences between them?
1. GPIO_SetBits
//eg:
GPIO_SetBits(GPIOA, GPIO_Pin_1 | GPIO_Pin_2);
Explanation: Set (set to 1) the selected data port bit, you can select multiple bits of the same port
2.GPIO_ResetBits
//eg:
GPIO_ResetBits(GPIOA, GPIO_Pin_1 | GPIO_Pin_2);
Explanation: Reset (set to 0) the selected data port bit. You can select multiple bits of the same port.
3. GPIO_WriteBit
//eg:
GPIO_WriteBit(GPIOA, GPIO_Pin_1 | GPIO_Pin_2, BIT_SET);
Explanation: Write port bits, support BIT_SET/BIT_RESET, write 1 or write 0, you can select multiple bits of the same port
四、GPIO_Write
//eg:
GPIO_Write(GPIOA, 0XFFFF);
Explanation: Directly write to the entire port, 0XFFFF means writing all 16 bits to 1
5. Summary:
| function | illustrate |
|---|---|
| GPIO_SetBits | Set IO, that is, pull the IO port high to 1 |
| GPIO_ResetBits | Reset the IO, that is, pull the IO port low to 0 |
| GPIO_WriteBit | When writing to IO, you can only customize settings to write 0 or 1, both 0 or both 1. |
| GPIO_Write | Write operation to the entire IO port, 0xFFFF corresponding to 0-15 PIN is set to 1; 0x0000 is set to 0 |