如何做RAM和ROM完整性檢查

RAM測試時(shí)有點(diǎn)類似下面的程序（當(dāng)然你可以修改它來使這個(gè)測試更全面些）——這里測試的RAM的數(shù)量是特定于PIC16C76的，如果要用于其它單片機(jī)型號，你需要查閱數(shù)據(jù)手冊來確定相應(yīng)型號的存儲(chǔ)器范圍。

#include

volatile unsigned char INDF @ 0x0; // not defined in pic.h

main()

{

IRP = 0;                /* select bank 0/1 */

    FSR = 0x20;             /* check bank 0 */
    do {
            INDF = 0x55;
    } while(++FSR != 0x80);

    FSR = 0x20;
    do {
            if(INDF != 0x55)
                    for(;;);
    } while(++FSR != 0x80);

    FSR = 0xA0;                // check bank 1
    do {
            INDF = 0x55;
    } while(++FSR != 0xF0);    // avoid the common area, already checked

    FSR = 0xA0;
    do {
            if(INDF != 0x55)
                    for(;;);
    } while(++FSR != 0xF0);

    IRP = 1;        /* select bank 2/3 */

    FSR = 0x10;     /* bank 2 RAM starts at 110 */
    do {
            INDF = 0x55;
    } while(++FSR != 0x70);  // last address is 170 (common is 170-17F)

    FSR = 0x10;
    do {
            if(INDF != 0x55)
                    for(;;);
    } while(++FSR != 0x70);  

    FSR = 0x90;                 // bank 3 RAM, 190-1EF
    do {
            INDF = 0x55;
    } while(++FSR != 0xF0);

    FSR = 0x90;
    do {
            if(INDF != 0x55)
                    for(;;);
    } while(++FSR != 0xF0);

}

ROM的校驗(yàn)和就要看情況而定了。并不是所有的PIC單片機(jī)都能夠讀它自己的程序存儲(chǔ)器的。部分Flash的型號是可以讀的，但是PIC16C76是不能夠讀的，請查看相應(yīng)單片機(jī)的數(shù)據(jù)手冊來確定。