The pins labeled SDA and SCL on SAM32_v2 are incorrect. They're still perfectly fine GPIO, but they wont work for I2C if you try to assign them as such.
alternative I2C pins broken out to headers on the SAM32 boards are:
SDA
SCL
SERCOM #
SERCOM GROUP
PAD[0]
PAD[1]
PA04
PA05
0
D
PA08
PA09
0
C
PA09
PA08
2
D
PA12
PA13
2
C
PA16
PA17
1
C
PA17
PA16
3
D
PA22
PA23
3
C
note: these pins won't have on-board pull-up resistors
maholli
commented
5 years ago
The pins labeled SDA and SCL on SAM32_v2 are incorrect. They're still perfectly fine GPIO, but they wont work for I2C if you try to assign them as such.
alternative I2C pins broken out to headers on the SAM32 boards are:
note: these pins won't have on-board pull-up resistors