Question: Programming procedure of ATMEGA328PB

[blauertee]

Hello! I would like to know how the general paged programming procedure works for the ATMEGA328PB. I have to write a programmer myself since I have to use a specific SPI interface or let's say the C# abstraction of that. I tried to figure these questions out starring at your source code, but it's just to complex of a project to be a quick help for me.

If no one has the time to help right now or this is too off topic just close this. :)

Is my understanding of the general Programming sequence that I got from the Datasheet right and if not where did I take the wrong turn?

(I'm using byte indices instead of words so the page size would by 128 bytes, and when I say byte index I mean relative to all the data I want tow write to the flash)

• Put the MCU into programming mode
• Write each Page by sending:
  • Write each byte of the page by sending:
    • INST[0] = 0x48, if the index of the byte even (Load Program Memory Page, Low byte)
    • INST[0] = 0x40, if the index of the byte is odd (Load Program Memory Page, High byte)
    • INST[1] = 0x0
    • INST[2] = the index of the byte relative to the current page divided by two (adr LSB)
    • INST[3] = the data byte (high/low data byte in)
  • send the write Instruction:
    • INST[0] = 0x4C (Write Program Memory Page)
    • INST[1] = byte index devided by two >> 8 (adr MSB)
    • INST[2] = byte index devided by two & 0xff
    • INST[3] 0x0
  • Poll RDY/BSY until Ready

If anyone find's any time to help I'd be grateful! Thx!

[mcuee]

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