How write to CH552 data flash

Bert V. wrote:

I tried just reading from 0xC000-0xC0FF without writing and the CH552 still reboots continuously.

reading the dataflsh does not work with movc, movc > 0x3FFF gives a reset

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//flashaccess must be already activated

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uint8_t ReadDataFlash(uint8_t addr, uint8_t *value)

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{

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   if((value) && (addr < 128))

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   {

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      ROM_ADDR = DATA_FLASH_ADDR | (addr < 1);

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      ROM_CTRL = ROM_CMD_READ;

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      if(ROM_STATUS & bROM_CMD_ERR) return 0xFE; // cmd error

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      *value = ROM_DATA_L;

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      return 0;                                  // success

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   }

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   return 0xFF;                                  // param error  

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}

writefunction is similar to the above

Thank you Thomas,

Works very well.

Best Regards,

Bert

there is a typo in my routine:

ROM_ADDR = DATA_FLASH_ADDR | (addr << 1); //only even access

sorry for that

I figured that out :-)

I have been testing the DataFlash with an endurance test. The CH552 user manual states it's good for 10,000 writes. It's still working after over 200,000 write/read cycles.