crycode-de / mcp-can-boot

CAN bus bootloader for AVR microcontrollers attached to an MCP2515 CAN controller.

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ATMEGA 328PB support? #5

Closed DomoticX closed 2 years ago

DomoticX commented 2 years ago

Hi, i was wondering what changes are needed to support the ATMEGA 328PB?

When uploading the 328P bootloader to a 328PB chip it doesn't seem to work...

i checked the pinout, the 328P is almost the same as 328PB, and these values in controller.h are correct also for 328PB

define IV_REG MCUCR

define SPI_DDR DDRB

define SPI_PORT PORTB

define SPI_SS 2

define SPI_MOSI 3

define SPI_MISO 4

define SPI_SCK 5

Do i need to alter some values? or have i overlooked it?

DomoticX commented 2 years ago

Never mind, it seems the fuse settings where not set properly (needed to restart ArduinoIDE), if you use the same as 328P it will be fine and works! ;-)

Example in ArduinoIDE boards.txt atmega328pbccCAN.bootloader.low_fuses=0xFF atmega328pbccCAN.bootloader.high_fuses=0xD8 atmega328pbccCAN.bootloader.extended_fuses=0xFC