如何使用__builtin_tblwtl / __ builtin_tblwth写入闪存

嘿，伙计们，我用的是PIC24FJ1024GA610，我试图写一个值（0x00 2222）到闪存地址0x00 48 FE。在写入地址之前，我读取存储在该位置的值并得到0x00 FFFFFF。这是我创建的用来读取存储值的函数：因为值是0x00 FFFFF，我想我不需要在写之前擦除位置（我可以设置‘1’到‘0’，而不是反过来）。这是我创建的将值写入位置的函数：但是，当我再次读取该位置时，该值仍然为0x00 FFFFFF。我想我搞砸了一些东西…谢谢你的帮助！



      以下为原文

    Hey guys,

I am using a PIC24FJ1024GA610, and I am trying to write a value (0x002222) to flash memory address 0x0048FE.

Before writing to the address, I read the value stored within the location and got 0x00FFFFFF. This is the function that I created to read the value stored:
unsigned long progADDR = 0x0048FE;
TBLPAG = ((progADDR & 0x7F0000) >> 16);
int addrOffset = (progADDR & 0x00FFFE);
        
readWordL = __builtin_tblrdl(addrOffset);
readByteH = __builtin_tblrdh(addrOffset);
printf("ReadWordL: %04xrn", readWordL);
printf("ReadByteH: %04xrn", readByteH);

Since the value is 0x00FFFFFF, I suppose I don't need to erase the location before writing (I can set '1' to '0' but not the other way round). This is the function that I created to write the value to the location:

unsigned long progADDR = 0x0048FE;
    unsigned int writeWordL = 0x2222;
    unsigned char writeByteH = 0x00;
    NVMCON = 0x4001;
    TBLPAG = 0xFA;
   
    NVMADRU = progADDR >> 16;
    NVMADR = progADDR & 0xFFFF;//THIS WAS THE ISSUE: IT WAS &&   
    __builtin_tblwtl(0,writeWordL);
    __builtin_tblwth(0,writeByteH);
    __builtin_disi(5);
    __builtin_write_NVM();

However, when I read the location again, the value remained to be 0x00FFFFFF. I think I messed up something here...

Thanks a lot for helping!