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| History | |||
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| Version | Issue Date | Notes | |
| 1.0.0 | Sep 2021 | First release | |
Contents
Audio interfaceEdit
There is no directly available Audio interface on the Evaluation Kit, two SAI and one SPDIF full duplex interfaces are available on the expansion connector.
DescriptionEdit
The SAI and SPDIF interfaces are available on the Evaluation Kit at the connector J8.
J8 is a 20x2x2.54mm pin header expansion connector that delivers many interfaces unused on board.
[[File:{Template:Nome-som-EVB-Audio-connector.png|thumb|center|500px|Audio connector]]
SignalsEdit
The following table describes the interfaces signals:
| Pin# | SOM Pin# | Pin name | Pin function | Pin Notes |
|---|---|---|---|---|
| 8 | J15. | SAI2_RXFS | ||
| 10 | J15. | SAI2_RXC | ||
| J15. | SAI2_TXFS | |||
| J15. | SAI2_RXD0 | |||
| J15. | SAI2_TXC | |||
| J15. | SAI2_TXD0 | |||
| J15. | SAI2_MCLK | |||
| J15. | SAI5_MCLK | |||
| J15. | SAI5_RXC | |||
| J15. | SAI5_RXD0 | |||
| J15. | SAI5_RXD1 | |||
| J15. | SAI5_RXD2 | |||
| J15. | SAI5_RXD3 | |||
| J15. | SAI5_RXFS | |||
| J15. | SPDIF_RX | |||
| J15. | SPDIF_TX | |||
| 2, 4 | - | 5V_VIN | Power output for transceiver supply | Always ON rail |
| 1, 17 | - | 3V3_CB | Power output for transceiver supply | BOARD_PGOOD driven rail |
| 6, 9, 14, 20,
25, 30, 34, 39 |
- | DGND | Ground |
Device mappingEdit
UART3 is mapped to /dev/ttymxc2 device in Linux. The peripheral is used as the default serial console, both for the bootloader and the kernel.
Device usageEdit
To connect to the debug serial port:
- connect the DB9 adapter bracket to the J22 connector on the SBCX board
- connect a serial cable between DB9 connector and PC COM port through a NULL-modem cable (not provided)
- start your favorite terminal emulator software on PC (eg: PuTTY); communication parameters are: 115200,N,8,1