The Embedded Debugger features an Atmel Data Gateway Interface
(DGI) by using either a SPI or I2C port. The DGI can be used to send a variety
of data from the SAM D21 to the host PC. For further information on how to use the DGI
interface see Embedded Debugger.
Table 4-11. DGI Interface Connections
when using SPI| Pin on SAM D21 | Function |
|---|
| PB31 | SERCOM5 PAD[1] SPI SS (Slave select) (SAM D21 is
Master) |
| PB16 | SERCOM5 PAD[0] SPI MISO (Master In, Slave Out) |
| PB22 | SERCOM5 PAD[2] SPI MOSI (Master Out, Slave in) |
| PB23 | SERCOM5 PAD[3] SPI SCK (Clock Out) |
Table 4-12. DGI Interface Connections
when using I2C| Pin on SAM D21 | Function |
|---|
| PA08 | SERCOM2 PAD[0] SDA (Data line) |
| PA09 | SERCOM2 PAD[1] SCL (Clock line) |
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 D21 application code. For further information on
how to configure and use the GPIO monitoring features see Embedded Debugger.
Table 4-13. GPIO Lines Connected to the EDBG| Pin on SAM D21 | Function |
|---|
| PA27 | GPIO0 |
| PA28 | GPIO1 |
| PA20 | GPIO2 |
| PA21 | GPIO3 |
