The Embedded Debugger features an Atmel Data Gateway Interface (DGI) by using either an SPI or I²C. The DGI can be used to send a variety of data from the ATSAMC21J18A to the host PC. For further information on how to use the DGI interface, see Atmel Data Visualizer and the EDBG User Guide.
| SAM C21 pin | Function | Shared functionality |
|---|---|---|
| PB23 | GPIO/SPI SS (Slave select) (SAM C21 is Master) | - |
| PB02 | SERCOM5 PAD[0] SPI MISO (Master In, Slave Out) | EXT2, EXT3, Shield, and Shield(2) |
| PB00 | SERCOM5 PAD[2] SPI MOSI (Master Out, Slave In) | EXT2, EXT3, Shield, and Shield(2) |
| PB01 | SERCOM5 PAD[3] SPI SCK (Clock Out) | EXT2, EXT3, Shield, and Shield(2) |
| SAM C21 pin | Function | Shared functionality |
|---|---|---|
| PA12 | SERCOM2 PAD[0] SDA (Data line) | EXT1, EXT2, EXT3, Shield, and Crypto Footprints |
| PA13 | SERCOM2 PAD[1] SCL (Clock line) | EXT1, EXT2, EXT3, Shield, and Crypto Footprints |
Four GPIO lines are connected to the Embedded Debugger. The EDBG can monitor these lines and time stamp pin value changes. This makes it possible to accurately time stamp events in the SAM C21 application code. For further information on how to configure and use the GPIO monitoring features, see Atmel Data Visualizer and the EDBG User Guide.