IOB->BSRR = 0x01就是把GPIOB port 0升为高电平\r\nGPIOB->BRR = 0x01就是把GPIOB port 0降为低电平\r\nGPIOB->BSRR = 0x02就是把GPIOB port 1升为高电平\r\nGPIOB->BRR = 0x02就是把GPIOB port 1降为低电平\r\nGPIOB->BSRR = 0x04就是把GPIOB port 2升为高电平\r\nGPIOB->BRR...