GPIO

1
GPIO

• Tr?n Xuân NghiaPhan Van Hòa

2
GPIO Block Diagram
3
M?u B?ng Ð?a Ch? Thanh Ghi GPIO
4
GPIO Configuration Table
5
LM3S2965 Board
6
LM3S2110 Board
7
L?p Trình GPIO

• include "lm3s2110.h
• int main(void)
• volatile unsigned long ulLoop
• //
• // Enable the GPIO port that is used for the
  on-board LED.
• //
• SYSCTL_RCGC2_R SYSCTL_RCGC2_GPIOF
• //
• // Do a dummy read to insert a few cycles
  after enabling the peripheral.
• //
• ulLoop SYSCTL_RCGC2_R
• //
• // Enable the GPIO pin for the LED (PF2).
  Set the direction as output, and
• // enable the GPIO pin for digital function.
• //
• GPIO_PORTF_DIR_R 0x04
• GPIO_PORTF_DEN_R 0x04

8
L?p Trình GPIO (t2)

• while(1)
• // Cho logic 1 (ON) ra c?ng F chân s? 2
• GPIO_PORTF_DATA_R 0x04 //0x04
  0000 0100 Port F Pin 2
• Delay()
• // Cho logic 0 (OFF) ra c?ng F chân s? 2
• GPIO_PORTF_DATA_R (0x04) //0xFB 1111
  1011 Port F Pin 2
• Delay()

9
LAB GPIO