bsp_i2c.c

嵌入式的tcpip协议栈

/*
*********************************************************************************************************
*                                     MICRIUM BOARD SUPPORT SUPPORT
*
*                          (c) Copyright 2003-2006; Micrium, Inc.; Weston, FL
*
*               All rights reserved.  Protected by international copyright laws.
*               Knowledge of the source code may NOT be used to develop a similar product.
*               Please help us continue to provide the Embedded community with the finest
*               software available.  Your honesty is greatly appreciated.
*********************************************************************************************************
*/

/*
*********************************************************************************************************
*
*                                           I2C FUNCTIONS
*
*                                             NXP LPC2468
*                                                on the
*                                  Embedded Artists LPC2468 OEM Board
*
* Filename      : bsp.c
* Version       : V1.00
* Programmer(s) : BAN
* Note(s)       : (1) Adapted from uCLinux distribution.
*********************************************************************************************************
*/

/*
*********************************************************************************************************
*                                             INCLUDE FILES
*********************************************************************************************************
*/

#define  BSP_GLOBALS
#include <includes.h>



/*
*********************************************************************************************************
*                                              LOCAL DEFINES
*********************************************************************************************************
*/

#define  I2CON_AA                   DEF_BIT_02
#define  I2CON_SI                   DEF_BIT_03
#define  I2CON_STO                  DEF_BIT_04
#define  I2CON_STA                  DEF_BIT_05
#define  I2CON_I2EN                 DEF_BIT_06

                                                                /* ---- I2C STATUS CODES: MASTER IN TRANSMITTER MODE ------ */
#define  I2STAT_SLA_W_ACK               0x18
#define  I2STAT_SLA_W_NOACK             0x20
#define  I2STAT_DAT_T_ACK               0x28
#define  I2STAT_DAT_T_NOACK             0x30

                                                                /* ------ I2C STATUS CODES: MASTER IN RECEIVER MODE ------- */
#define  I2STAT_SLA_R_ACK               0x40
#define  I2STAT_SLA_R_NOACK             0x48
#define  I2STAT_DAT_R_ACK               0x50
#define  I2STAT_DAT_R_NOACK             0x58

                                                                /* ---------- I2C STATUS CODES: MASTER AND SLAVE ---------- */
#define  I2STAT_START                   0x08
#define  I2STAT_REPEATED_START          0x10
#define  I2STAT_ARB_LOST                0x38
#define  I2STAT_NOP                     0x58
#define  I2STAT_BUS_ERROR               0x00


//#define  PCA9551_ADDRESS                0xC0

#define  PCA9532_INPUT0                 0x00
#define  PCA9532_INPUT1                 0x01
#define  PCA9532_PSC0                   0x02
#define  PCA9532_PWM0                   0x03
#define  PCA9532_PSC1                   0x04
#define  PCA9532_PWM1                   0x05
#define  PCA9532_LS0                    0x06
#define  PCA9532_LS1                    0x07
#define  PCA9532_LS2                    0x08
#define  PCA9532_LS3                    0x09

//#define  SA56004_ADDRESS                0xA0
/*
*********************************************************************************************************
*                                           LOCAL CONSTANTS
*********************************************************************************************************
*/


/*
*********************************************************************************************************
*                                          LOCAL DATA TYPES
*********************************************************************************************************
*/


/*
*********************************************************************************************************
*                                            LOCAL TABLES
*********************************************************************************************************
*/


/*
*********************************************************************************************************
*                                       LOCAL  & GLOBAL VARIABLES
*********************************************************************************************************
*/

static  CPU_INT08U      I2C_Address;
static  CPU_INT08U     *I2C_BufPtr;
static  CPU_INT08U      I2C_Count;

static  OS_EVENT       *I2C_SemWait;
static  OS_EVENT       *I2C_SemBusy;



           
/*
*********************************************************************************************************
*                                      LOCAL FUNCTION PROTOTYPES
*********************************************************************************************************
*/


/*
*********************************************************************************************************
*                                     LOCAL CONFIGURATION ERRORS
*********************************************************************************************************
*/


/*
*********************************************************************************************************
*********************************************************************************************************
**                                         GLOBAL FUNCTIONS
*********************************************************************************************************
*********************************************************************************************************
*/

/*
*********************************************************************************************************
*                                        I2C_Init()
*
* Description : Initialize the I2C.
*
* Argument(s) : none.
*
* Return(s)   : none.
*********************************************************************************************************
*/

void  I2C_Init (void)
{
    CPU_INT32U  pinsel;
    CPU_INT08U  err;


    VICIntSelect  &= ~(1 << VIC_I2C0);                          /* Configure the I2C interrupt as an IRQ source             */
    VICVectAddr9   =  (CPU_INT32U)I2C_ISR_Handler;              /* Set the vector address                                   */
    VICIntEnClear  =  (1 << VIC_I2C0);                          /* Disable the interrupt source                             */

    pinsel         = PINSEL1;
    pinsel        &= 0xFC3FFFFF;
    pinsel        |= 0x01400000;
    PINSEL1        = pinsel;

    I20CONCLR      = 0x006C;                                    /* Clear flags                                              */

    I20SCLH        = 0x00F0;
    I20SCLL        = 0x0160;

    I2C_SemWait    = OSSemCreate(0);
#if (OS_EVENT_NAME_SIZE > 1)
    OSEventNameSet(I2C_SemWait, "I2C Wait", &err);
#endif

    I2C_SemBusy    = OSSemCreate(1);
#if (OS_EVENT_NAME_SIZE > 1)
    OSEventNameSet(I2C_SemBusy, "I2C Busy", &err);
#endif

}


/*
*********************************************************************************************************
*                                        I2C_Read()
*
* Description : Read from the I2C bus.
*
* Argument(s) : p_buf       Pointer to the buffer into which the bytes will be stored.
*
*               count       Number of bytes to read.
*
* Return(s)   : none.
*********************************************************************************************************
*/

void  I2C_Read (CPU_INT08U  address,
                CPU_INT08U  *p_buf,
                CPU_INT08U   count)
{
    CPU_INT08U  err;


    OSSemPend(I2C_SemBusy, 0, &err);                            /* Wait until I2C is free                                   */

    I20CONCLR    = I2CON_I2EN
                 | I2CON_STA
                 | I2CON_SI
                 | I2CON_AA;

    I20CONSET    = I2CON_I2EN;

    I2C_Address  = (address | 0x01);                    /* Set lower bit of address                                 */
    I2C_BufPtr   = p_buf;
    I2C_Count    = count;

    I20CONSET    = I2CON_STA
                 | I2CON_AA;