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我正在尝试与 PIC24F16KA101 MCU 的内部存储器进行交互。在阅读了项目中使用的数据表和本网站上的讨论（提供了非常有用的示例代码）之后， 现在如果我将代码放在程序下面，那么程序就可以正常工作了，因为我能够成功读取与我相同的值之前写过。但是，如果在写入后我拔下 MCU 并仅读取 EEPROOM，它不会返回写入的值。这里可能是什么问题？为什么我可以写入然后读取成功但断电后无法读取？在此先感谢大家的帮助达米安

int __attribute__ ((space(eedata))) ee_addr;
void EepSetup();
void EepErase(void);
int EepWrite(int index, int data);
int EepRead(int index);

int main(int argc, char** argv) 
{
    unsigned int data = 123;
    unsigned int data_read = 0;

    Init_UART1();
    UART1WriteString("START EEPROM PROGRAM \n");
    EepSetup();
    UART1WriteString("WRITING DATA TO MEMORY \n");
    EepWrite(1,data);

    //if the code works, just comment the upper section and read eeprom after
    //disconecting the power source
    UART1WriteString("READING DATA FROM MEMORY \n");
    data_read = EepRead(1);
    UART1WriteString("Value Read: ");
    UART1WriteInt(data_read,16);
    UART1WriteString("\n");
    __delay_ms(1000);
    return (EXIT_SUCCESS);
}
void EepSetup(){
    //Disable Interrupts For 5 instructions
    asm volatile("disi #5");
    //Issue Unlock Sequence
    asm volatile("mov #0x55, W0 \n"
    "mov W0, NVMKEY \n"
    "mov #0xAA, W1 \n"
    "mov W1, NVMKEY \n");
}
void EepErase(void) {
    NVMCON = 0x4050;            // Set up NVMCON to bulk erase the data EEPROM
    asm volatile ("disi #5");   // Disable Interrupts For 5 Instructions
    __builtin_write_NVM();      // Issue Unlock Sequence and Start Erase Cycle
    while(_WR)
    ;
}

int EepRead(int index){
    unsigned int offset;

    TBLPAG = __builtin_tblpage(&ee_addr);    // Initialize EE Data page pointer
    offset = __builtin_tbloffset(&ee_addr);  // Initizlize lower word of address
    offset += index * sizeof(int);
    return __builtin_tblrdl(offset);    // read EEPROM data
}

int EepWrite(int index, int data){
    unsigned int offset;
    NVMCON = 0x4004;    // Set up NVMCON to erase one word of data EEPROM
    TBLPAG = __builtin_tblpage(&ee_addr);    // Initialize EE Data page pointer
    offset = __builtin_tbloffset(&ee_addr);  // Initizlize lower word of address
    offset += index * sizeof(int);
    __builtin_tblwtl(offset, data);
    asm volatile ("disi #5");   // Disable Interrupts For 5 Instructions
    __builtin_write_NVM();      // Issue Unlock Sequence and Start Erase Cycle
    while(_WR);
    return (EXIT_SUCCESS);
}
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1 回答 1

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我刚刚弄清楚问题出在哪里，碰巧如果您将 PICkit 3 与 MPLABX 一起使用，您必须在编程器中检查一个选项以保留 EEPROM 存储器，因此代码可以正常工作，您只需要检查“在编程器设置中保留 EEPROM 存储器”。我希望这对其他人有帮助。

干杯，达米安

于 2014-11-16T17:52:47.073 回答