LPC1766 GPIO Inputs and Outputs

I played around with STM32 some time ago and it was good. It has rich resources and functions and is easy to use. It is not at the same level as 51. After using it, I decided to use an embedded MCU with RAM-M3 core. The only drawback is that the firmware library of STM32 is not easy to use. I started by directly operating the registers (the influence of 51). But I also found that the external modules of STM32 are very difficult to operate, especially I2C, which is simply unusable.

Today I got LPC1766, and compared it with STM32, LPC is more suitable for direct register operation. Today's learning results are as follows (based on Zhou Ligong's LPC1766 board):

/****************************************Copyright (c)***** ***********************************************
** Guangzhou ZLGMCU Development Co., LTD
**--------------File Info-------------------------- -------------------------------------------------- -----
** File name: main.c
** Last modified Date: 2010-09-28
** Last Version: V1.0
** Descriptions: The main() function example template
**
**--- -------------------------------------------------- -------------------------------------------------- -
** Created by: Lan wuqiang
** Created date: 2010-09-28
** Version: V1.00
** Descriptions: Organize templates, add user applications
**
**---------- -------------------------------------------------- -----------------------------------------------
** Modified by:        
* * Modified date:      
** Version:            
** Descriptions:       
**
**---------------------------------- -------------------------------------------------- --------------------
** Modified by:       
** Modified date:     
** Version:           
** Descriptions:      
**
** Rechecked by:
***** *************************************************** *************************************************** /
#include "LPC17xx.h" /* LPC17xx peripheral registers */

/*************************************************************************************************************
  Variables and macro definitions
****************************************************************************************/
#define BEEP (1 << 11) /* P0.11 is connected to the buzzer */
#define KEY1 (LPC_GPIO2->FIOPIN & (1 << 10)) /* P2.10 is connected to KEY1 */
#define KEY2 (LPC_GPIO2->FIOPIN & (1 << 11)) /* P2.11 is connected to KEY2 */  
#define KEY3 (LPC_GPIO2->FIOPIN & (1 << 12)) /* P2.12 is connected to KEY3 */
#define KEY4 (LPC_GPIO2->FIOPIN & (1 << 13)) /* P2.13 is connected to KEY4 */

#define BEEPOFF() LPC_GPIO0->FIODIR |= BEEP;LPC_GPIO0->FIOSET |= BEEP /* Buzzer off */
#define BEEPON() LPC_GPIO0->FIODIR |= BEEP;LPC_GPIO0->FIOCLR |= BEEP /* Buzzer on */
#define LED1 (1 << 0) /* P2.0 connects to LED1 */
#define LED2 (1 << 1) /* P2.1 connects to LED2 */
#define LED3 (1 << 2) /* P2.2 connects to LED3 */
#define LED4 (1 << 3) /* P2.3 connects to LED4 */
#define LED1OFF() LPC_GPIO2->FIODIR |= LED1;LPC_GPIO2->FIOSET |= LED1 /* LED1 off */
#define LED1ON() LPC_GPIO2->FIODIR |= LED1;LPC_GPIO2->FIOCLR |= LED1 /* LED1 on */
#define LED2OFF() LPC_GPIO2->FIODIR |= LED2;LPC_GPIO2->FIOSET |= LED2 /* LED2 off */
#define LED2ON() LPC_GPIO2->FIODIR |= LED2;LPC_GPIO2->FIOCLR |= LED 2 /* LED2 on */
#define LED3OFF() LPC_GPIO2->FIODIR |= LED3;LPC_GPIO2->FIOSET |= LED3 /* LED1 off */
#define LED3ON() LPC_GPIO2->FIODIR |= LED3;LPC_GPIO2->FIOCLR |= LED3 /* LED1 on */
#define LED4OFF() LPC_GPIO2->FIODIR |= LED 4;LPC_GPIO2->FIOSET |= LED4 /* LED2 is off */
#define LED4ON() LPC_GPIO2->FIODIR |= LED4;LPC_GPIO2->FIOCLR |= LED4 /* LED2 is on */

/*************************************************************************************************************
** Function name: GPIOInit
** Descriptions: GPIO initialization
** Input parameters: None
** Output parameters: None
** Returned value: None
**************************************************************************************************/
void GPIOInit (void)
{
    LPC_PINCON->PINSEL0 &= ~(0x03 << 22); /* Configure P0.11 as GPIO */
    LPC_PINCON->PINSEL4 &= 0XF00FFF00; /* Configure P2.0~P2.3 ​​and P2.10~P2.13 as GPIO*/

    LPC_GPIO0->FIODIR |= BEEP; /* Configure P0.11 (BEEP) as output 1 */
    LPC_GPIO2->FIODIR |= 0X000000FF; /* Configure P2.0~P2.3 ​​as output 1 */
    LPC_GPIO2->FIODIR &= 0XFFC3FFFF; /* Configure P2.10~P2.13 as input 0 */

}

/*************************************************************************************************************
** Function name: main
** Descriptions: User program entry function, short JP17, P0.11 pin controls the buzzer,
** Short JP4's KEY1 and P2_10, each time KEY1 is pressed, the buzzer sounds
** input parameters: None
** output parameters: None
** Returned value: None
******************************************************************************************************/
int main (void)
{
    SystemInit(); /* System initialization */
   
    GPIOInit(); 

    while (1) {
        if (KEY1 == 0) { /* If KEY1 is pressed, the buzzer will sound */
            BEEPON();
   LED1ON();
        } else { /* If KEY1 is released, the buzzer will stop */
            BEEPOFF();
   LED1OFF();
        }
        if (KEY2 == 0) { /* If KEY2 is pressed, LED2 will turn on */
   LED2ON();
        } else { /* If KEY2 is released, LED2 will turn off */
   LED2OFF();
        }
        if (KEY3 == 0) { /* If KEY3 is pressed, LED3 will turn on */
   LED3ON();
        } else { /* If KEY3 is released, LED3 will turn off */
   LED3OFF();
        }
        if (KEY4 == 0) { /* If KEY4 is pressed, LED4 will turn on */
   LED4ON();
        } else { /* If KEY4 is released, LED4 will turn off */
   LED4OFF();
        }
    }
}

/****************************************************** *************************************************** ******
  End Of File
***************************************** *************************************************** ******************/