Please ask a GPIO basic question

yunhai14

Please ask a GPIO basic question [Copy link]

LPC1768 chip FIO0CLR = 255; //High-speed port output clear register, write 1 to make the corresponding port generate a low level. 255 is 8-bit binary 1111 1111. That is, set P0.0 P0.1 P0.2 P0.3 P0.4 P0.5 P0.6 P0.7 8 pins to 1. Question 1: I only want to set 6 pins from P0.0 to P0.5. What should I do? Question 2: Is P0.0 the leftmost red position or the rightmost blue position? Question 3: If it is the FIO2DIR register, how can I only set P2.0 P2.1 P2.2 P2.3 P2.4 P2.5 and P2.8 P2.9 P2.11 P2.12

tiankai001

Taking MSP430 as an example, bit operations are used to implement I/O input and output control, P1DIR |= BIT0+BIT2+BIT3, P1DIR &= ~(BIT0+BIT2+BIT3)

懒猫爱飞

1) First read the two bits of data that you don't want to change, change the corresponding bits of your 8 bits, and then assign the value. 2) The general writing method is that the low bit is on the far right. 3) port |= BV(1)|BV(2)|...|BV(N) #define BV(X) (1<

Please ask a GPIO basic question