LPC2138+LCD1602 counter proteus simulation and source code adding comments and changing pins

The schematic diagram of the LPC2138 simulation simple calculator is as follows (the proteus simulation project file can be downloaded from the attachment of this post) The lcd1602 liquid crystal display
 

LPC2138 source program is as follows:

#define IN_TARGET

#include "config.h"

#define LED1 1 << 18 // P0.18 controls LED1

/*********************************************************************************************************

** Function name: IRQ_Exception

** Function description: Interrupt exception handling program, users can change the program according to their needs

********************************************************************************************************/

void __irq IRQ_Exception(void)

        {

    while(1); // Replace this sentence with your own code

        }

/*********************************************************************************************************

** Function name: FIQ_Exception

** Function description: Quickly interrupt the exception handling program, the user can change the program according to the needs

********************************************************************************************************/

void FIQ_Exception(void)

{         uint32 i;

        i = IO0SET; // Read the current control value of LED1

        if ((i & LED1) == 0) IO0SET = LED1;

        else IO0CLR = LED1;

/* Wait for the external interrupt signal to return to a high level. If the signal remains at a low level, the interrupt flag will remain set*/

        while ((EXTINT & 0x01) != 0)

        { EXTINT = 0x01; // Clear EINT0 interrupt flag

        }

}

/*********************************************************************************************************

** Function name: TargetInit

** Function description: Target board initialization code, called where needed, changed as needed

********************************************************************************************************/

void TargetInit(void)

{

    /* Add your own code */

}

/*********************************************************************************************************

** Function name: TargetResetInit

** Function description: Target board initialization code before calling main function, change as needed, cannot be deleted

********************************************************************************************************/

void TargetResetInit(void)

{

/* Set memory mapping mode */

#ifdef DEBUG_RAM // If debugging in on-chip RAM

MEMMAP = 0x02; // Map to on-chip RAM

#endif

#ifdef DEBUG_FLASH // If debugging in on-chip FLASH

MEMMAP = 0x01; // Map to on-chip FLASH

#endif

#ifdef IN_CHIP // If the FLASH is released in the chip

MEMMAP = 0x01; // Map to on-chip FLASH

#endif

/* Set the clocks of each part of the system */

    PLLCON = 1; // Set to activate but not connect PLL

#if ((Fcclk / 4) / Fpclk) == 1 // This value is determined by the system hardware

    VPBDIV = 0;

#endif

#if ((Fcclk / 4) / Fpclk) == 2 // This value is determined by the system hardware

    VPBDIV = 2;

#endif

#if ((Fcclk / 4) / Fpclk) == 4 // This value is determined by the system hardware

    VPBDIV = 1;

#endif

/* Set the value of PLL multiplication factor M and division factor P*/

#if (Fcco / Fcclk) == 2

    PLLCFG = ((Fcclk / Fosc) - 1) | (0 << 5);

#endif

#if (Fcco / Fcclk) == 4

    PLLCFG = ((Fcclk / Fosc) - 1) | (1 << 5);

#endif

#if (Fcco / Fcclk) == 8

    PLLCFG = ((Fcclk / Fosc) - 1) | (2 << 5);

#endif

#if (Fcco / Fcclk) == 16

    PLLCFG = ((Fcclk / Fosc) - 1) | (3 << 5);

#endif

    PLLFEED = 0xaa; // Send PLL feed sequence to execute the action of setting PLL

    PLLFEED = 0x55;

    while((PLLSTAT & (1 << 10)) == 0); // Wait for PLL to lock

    PLLCON = 3; // Set to activate and connect PLL

    PLLFEED = 0xaa; // Send PLL feed sequence, perform activation and connection actions

    PLLFEED = 0x55;

/* Set up memory acceleration module */

    MAMCR = 0; // Disable MAM function

#if Fcclk < 20000000

    MAMTIM = 1; // System clock is lower than 20M, it is recommended to set it to 1

#else

#if Fcclk < 40000000

    MAMTIM = 2; // The system clock is between 20M and 40M, it is recommended to set it to 2

#else

    MAMTIM = 3; // System clock is higher than 40M, it is recommended to set it to 3

#endif

#endif

    MAMCR = 2; // Enable MAM function

/* Initialize VIC */

    VICIntEnClr = 0xffffffff; // Clear all interrupts

    VICVectAddr = 0; // default vector address register

    VICIntSelect = 0; // 0: The corresponding interrupt request is assigned to IRQ, 1: The corresponding interrupt request is assigned to FIQ.

    /* Add your own code */

}

/*******************************************************************************************

** The following are some implementations of system-related library functions, which users can modify according to their own requirements

*******************************************************************************************/

#include "rt_sys.h"

// for printf and scanf fuctions

int sendchar (int ch)  {                 /* Write character to Serial Port    */

  while (!(U0LSR & 0x20));

  return (U0THR = ch);

}

int getkey (void)  {                     // Read character from Serial Port

  while (!(U0LSR & 0x01));

  return (U0RBR);

}

int fputc(int ch,FILE *f)

{

  return (sendchar(ch));

}

int fgetc(FILE *f) {

  return (sendchar(getkey()));

……………………