GPIO driver for PC1788

#include "led.h"

void led_init(void)

{

    //p1.14 p0.16 p1.13 p4.27

    LPC_SC->PCONP |= (1<<15); //Turn on the clock

    //Select the pin mode. 1788 has designed a register for each pin to select the pin mode

    LPC_IOCON->P1_14 = 0x00; //Select gpio function, disable hysteresis, non-reverse, normal push-pull

    LPC_IOCON->P1_14 |= (2<<3); //Pull up

    P1dir(14) = 1; //output

    P1low(14) = 1; //Set to low level

    LPC_IOCON->P0_16 = 0x00; //Select gpio function, disable hysteresis, non-reverse, normal push-pull

    LPC_IOCON->P0_16 |= (2<<3); //Pull up

    P0dir(16) = 1; //output

    P0low(16) = 1; //Set to low level

    LPC_IOCON->P1_13 = 0x00; //Select gpio function, disable hysteresis, non-reverse, normal push-pull

    LPC_IOCON->P1_13 |= (2<<3); //Pull up

    P1dir(13) = 1; //output

    P1low(13) = 1; //Set to low level

    LPC_IOCON->P4_27 = 0x00; //Select gpio function, disable hysteresis, non-reverse, normal push-pull

    LPC_IOCON->P4_27 |= (2<<3); //Pull up

    P4dir(27) = 1; //output

    P4low(27) = 1; //Set to low level

}

void led_set(u8 ch)

{

    switch(ch)

    {

    case 0:

        P1high(14) = 1;

        break;

    case 1:

        P0high(16) = 1;

        break;

    case 2:

        P1high(13) = 1;

        break;

    case 3:

        P4high(27) = 1;

        break;

    }

}

void led_clear(u8 ch)

{

    switch(ch)

    {

    case 0:

        P1low(14) = 1; //Set to low level

        break;

    case 1:

        P0low(16) = 1; //Set to low level

        break;

    case 2:

        P1low(13) = 1; //Set to low level

        break;

    case 3:

        P4low(27) = 1; //Set to low level

        break;

    }

}

//Bitband operation to achieve GPIO control function similar to 51

//For specific implementation ideas, please refer to Chapter 5 (pages 87-92) of <>.

//IO port operation macro definition

#define BITBAND(addr, bitnum) ((addr & 0xF0000000)+0x2000000+((addr &0xFFFFF)<<5)+(bitnum<<2))

#define MEM_ADDR(addr)  *((volatile unsigned long  *)(addr))

#define BIT_ADDR(addr, bitnum)   MEM_ADDR(BITBAND(addr, bitnum))

//IO port address mapping

//Output register

#define GPIO0_ODR_Addr    (LPC_GPIO0_BASE+0x18) //0x2009C018

#define GPIO1_ODR_Addr    (LPC_GPIO1_BASE+0x18) //0x2009C038

#define GPIO2_ODR_Addr    (LPC_GPIO2_BASE+0x18) //0x2009C058

#define GPIO3_ODR_Addr    (LPC_GPIO3_BASE+0x18) //0x2009C078

#define GPIO4_ODR_Addr    (LPC_GPIO4_BASE+0x18) //0x2009C098

//Input register

#define GPIO0_IDR_Addr    (LPC_GPIO0_BASE+0x14) //0x2009C014

#define GPIO1_IDR_Addr    (LPC_GPIO1_BASE+0x14) //0x2009C034

#define GPIO2_IDR_Addr    (LPC_GPIO2_BASE+0x14) //0x2009C054

#define GPIO3_IDR_Addr    (LPC_GPIO3_BASE+0x14) //0x2009C074

#define GPIO4_IDR_Addr    (LPC_GPIO4_BASE+0x14) //0x2009C094

//Direction register

#define GPIO0_DIR_Addr    (LPC_GPIO0_BASE+0x00) //0x2009C000

#define GPIO1_DIR_Addr    (LPC_GPIO1_BASE+0x00) //0x2009C020

#define GPIO2_DIR_Addr    (LPC_GPIO2_BASE+0x00) //0x2009C040

#define GPIO3_DIR_Addr    (LPC_GPIO3_BASE+0x00) //0x2009C060

#define GPIO4_DIR_Addr    (LPC_GPIO4_BASE+0x00) //0x2009C080

// Clear register

#define GPIO0_CLS_Addr    (LPC_GPIO0_BASE+0x1C) //0x2009C01C

#define GPIO1_CLS_Addr    (LPC_GPIO1_BASE+0x1C) //0x2009C03C

#define GPIO2_CLS_Addr    (LPC_GPIO2_BASE+0x1C) //0x2009C05C

#define GPIO3_CLS_Addr    (LPC_GPIO3_BASE+0x1C) //0x2009C07C

#define GPIO4_CLS_Addr    (LPC_GPIO4_BASE+0x1C) //0x2009C09C

//IO port operation, only for a single IO port!

// Make sure the value of n is less than 32!

#define P0high(n) BIT_ADDR(GPIO0_ODR_Addr,n) //Output 0 Output unchanged 1 Output is 1

#define P0low(n) BIT_ADDR(GPIO0_CLS_Addr,n) // Clear 0 output unchanged 1 output 0

#define P0in(n)    BIT_ADDR(GPIO0_IDR_Addr,n)  //输入

#define P0dir(n) BIT_ADDR(GPIO0_DIR_Addr,n) //Direction 0 input 1 output

#define P1high(n) BIT_ADDR(GPIO1_ODR_Addr,n) //Output 0 Output unchanged 1 Output is 1

#define P1low(n) BIT_ADDR(GPIO1_CLS_Addr,n) // Clear 0 output unchanged 1 output 0

#define P1in(n) BIT_ADDR(GPIO1_IDR_Addr,n) //Input

#define P1dir(n) BIT_ADDR(GPIO1_DIR_Addr,n) //Direction 0 input 1 output

#define P2high(n) BIT_ADDR(GPIO2_ODR_Addr,n) //Output 0 Output unchanged 1 Output is 1

#define P2low(n) BIT_ADDR(GPIO2_CLS_Addr,n) // Clear 0 output unchanged 1 output 0

#define P2in(n)    BIT_ADDR(GPIO2_IDR_Addr,n)  //输入

#define P2dir(n) BIT_ADDR(GPIO2_DIR_Addr,n) //Direction 0 input 1 output

#define P3high(n) BIT_ADDR(GPIO3_ODR_Addr,n) //Output 0 Output unchanged 1 Output is 1

#define P3low(n) BIT_ADDR(GPIO3_CLS_Addr,n) // Clear 0 output unchanged 1 output 0

#define P3in(n)    BIT_ADDR(GPIO3_IDR_Addr,n)  //输入

#define P3dir(n) BIT_ADDR(GPIO3_DIR_Addr,n) //Direction 0 input 1 output

#define P4high(n) BIT_ADDR(GPIO4_ODR_Addr,n) //Output 0 Output unchanged 1 Output is 1

#define P4low(n) BIT_ADDR(GPIO4_CLS_Addr,n) // Clear 0 output unchanged 1 output 0

#define P4in(n)    BIT_ADDR(GPIO4_IDR_Addr,n)  //输入

#define P4dir(n) BIT_ADDR(GPIO4_DIR_Addr,n) //Direction 0 input 1 output