evm5509_keypad.c

dsp 5509a MMC 卡 ID号读取 12Mhzx16=192M

/*
 *  Copyright 2004 by Spectrum Digital Incorporated.
 *  All rights reserved. Property of Spectrum Digital Incorporated.
 */

/*
 *  ======== evm5509_keypad.c ========
 *  EVM642_SROM_write() implementation
 */

#include <csl.h>
#include <csl_i2c.h>
#include <csl_adc.h>

#include "evm5509.h"
#include "evm5509_keypad.h"
#include "evm5509_lcd.h"

static Uint16 databuf[4];

/* Analog switch constants */
#define SWITCH_ERROR      0x10
#define SWITCH_OFF        0x300

#define SWITCH_NOCHANGE   0
#define SWITCH_CHANGE     1

#define AIN_KEY           1
#define AIN_JOG           0

typedef struct {
    int adcval;
    int keymapping;
} SWITCH_LIST_ENTRY;

SWITCH_LIST_ENTRY keylist[] = {
    {0x150, 0x01},    // Switch 01
    {0x0f2, 0x02},    // Switch 02
    {0x17c, 0x03},    // Switch 03
    {0x0bf, 0x04},    // Switch 04
    {0x1b9, 0x05},    // Switch 05
    {0x07b, 0x06},    // Switch 06
    {0x200, 0x07},    // Switch 07
    {0x03d, 0x08},    // Switch 08
    {0x23a, 0x09},    // Switch 09
    {0x000, 0x00}
};

SWITCH_LIST_ENTRY joglist[] = {
    {0x07b, 0x0A},    // Switch 0A (Jog down)
    {0x150, 0x0B},    // Switch 0B (Jog up)
    {0x200, 0x0C},    // Switch 0C (Jog in)
    {0x000, 0x00}
};

void EVM5509_KEYPAD_init()
{
    ADC_Config adcCfg = {
        ADC_ADCCTL_RMK(    ADC_ADCCTL_ADCSTART_OFF,
                           ADC_ADCCTL_CHSELECT_AIN1),
        ADC_ADCCLKDIV_RMK( ADC_ADCCDR_SAMPTIMEDIV_OF(60),
                           ADC_ADCCDR_CONVRATEDIV_8DIV),
        ADC_ADCCLKCTL_RMK( ADC_ADCCCR_IDLEEN_ACTIVE,
                           ADC_ADCCCR_CPUCLKDIV_OF(15))
    };
    
    ADC_config(&adcCfg);
}

int Switch_KeyMap(int adcreading, SWITCH_LIST_ENTRY *list)
{
    int diff;
    SWITCH_LIST_ENTRY *s;
    
    s = list;
    while (s -> keymapping != 0)
    {
        diff = s -> adcval - adcreading;
        if (diff < 0)
            diff = -diff;
        if (diff <= SWITCH_ERROR)
            return s -> keymapping;
        s++;
    }

    if (adcreading < SWITCH_OFF)
        return -1;
    else
        return 0;
}

/*
 *  ======== EVM5509_KEYPAD_readPot ========
 *  Read the value of a potentiometer
 */
Uint16 EVM5509_KEYPAD_readPot(Int16 potnum)
{
    Uint16 acc;
    Int16 i, id;

    /* Pot #1 = I2C Address + 2, Pot #2 = I2C Address + 1 */
    if (potnum == 2)
        id = 1;
    else
        id = 2;

    /* Take I2C controller out of reset, put in master transmitter mode */
    I2C_RSET(I2CMDR, 0);
    I2C_FSET(I2CMDR, MST, 1);
    I2C_FSET(I2CMDR, FREE, 1);
    I2C_FSET(I2CMDR, TRX, 1);
    I2C_FSET(I2CMDR, IRS, 1);

    /* Set the I2C controller to write 2 byte address + length bytes data */
    I2C_RSET(I2CCNT, 1);
    I2C_RSET(I2CSAR, EVM5509_KEYPAD_I2CADDR + id);  
    
    /* Generate start condition */
    I2C_FSET(I2CMDR, STT, 1);

    /* Transmit a null data byte to initiate A/D transfer */
    I2C_RSET(I2CDXR, 0);

    /* Wait until finished */
    while(!I2C_xrdy());

    /* Generate stop condition */
    I2C_FSET(I2CMDR, STP, 1);

    /* Wait until bus free */
    while(I2C_FGET(I2CSTR, BB) != 0);
    
    /* Take I2C controller out of reset, put in master receiver mode */
    I2C_RSET(I2CMDR, 0);
    I2C_FSET(I2CMDR, MST, 1);
    I2C_FSET(I2CMDR, FREE, 1);
    I2C_FSET(I2CMDR, TRX, 0);
    I2C_FSET(I2CMDR, IRS, 1);
            
    /* Set the I2C controller to read 4 samples */
    I2C_RSET(I2CCNT, 4);
    I2C_RSET(I2CSAR, EVM5509_KEYPAD_I2CADDR + id);
    
    /* Generate Start condition */
    I2C_FSET(I2CMDR, STT, 1);

    acc = 0;
    for (i = 0; i < 4; i++)
    {
        /* Wait for receive data to come back */
        while(!I2C_rrdy());
        
        /* Copy the data out */
        if ((i & 1) == 0)
            databuf[i >> 1] = I2C_RGET(I2CDRR) << 8;
        else {
            databuf[i >> 1] |= I2C_RGET(I2CDRR);
            acc += databuf[i >> 1];
        }
    }

    /* Generate stop condition */
    I2C_FSET(I2CMDR, STP, 1);

    /* Wait until bus free */
    while(I2C_FGET(I2CSTR, BB) != 0);
    
    return (acc >> 1);
}

/*
 *  ======== EVM5509_KEYPAD_readKey ========
 *  Read the value of a keyswitch
 */
Uint16 EVM5509_KEYPAD_readKey()
{
    Uint16 keyval;
    
    /* Read analog key value */
    ADC_read(AIN_KEY, &keyval, 1);

    return Switch_KeyMap(keyval, keylist);
}