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ETRA SOM/ETRA Evaluation Kit/Interfaces and Connectors/micro SD

471 bytes removed, 14:41, 31 December 2020
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<section begin="History" />
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<section end="History" /><section begin="Body" />
==micro SD interface ==
 
''TBD: sostituire le sezioni con le informazioni sull'uso della periferica e del suo connettore''
''Nell'esempio di seguito c'è la descrizione dell'interfaccia UART/console''
=== Description ===
The micro SD interface available on the Evaluation Kit at the connector ''TBD:Jxxx''J4.
''Jxx'' J4 is a ''TBD:connectorMicro-type'' SD card header connector for . This interface is connected to the RS232 two-wires UART3 port, used for debug purposes (bootloader and operating system serial console)SDMMC1 controller of the STM32MP1 CPU.
The following table describes the interface signals:
 {| class="wikitable" ! latexfontsize="scriptsize"| Pin#! latexfontsize="scriptsize"| SOM Pin#! latexfontsize="scriptsize"| Pin name! latexfontsize="scriptsize"| Pin function! latexfontsize="scriptsize"| Pin Notes|-|1|J18.79|PE6|Data 1||-|2|J18.81|PC11|Data 3||-|3|J18.83|PD2|CMD||-|4| -|3V3_SD| +3.3 V||-|5|J18.85|PC12|Clock|
|-
|1,2,4,6,,7,8,10
| -
| N.A.DGND| N.C.Ground| Not connected
|-
| 37| J1J18.18975| RS232_RXPC8| Receive lineData 0|
|-
| 38| J1J18.18777| RS232_TXPC9| Transmit lineData 1|
|-
| 911, 12, 13, 14
| -
| DGNDSD_SHIELD| GroundShield||-|9|J18.177|PE9|Card detect|
|}
=== Device mapping ===
UART3 The microSD card is mapped to <code>/dev/ttymxc2mmcblk0</code> device in Linux. The peripheral is used available partitions are available as the default serial console<code>/dev/mmcblk0p1</code>, <code>/dev/mmcblk0p2</code>, both for the bootloader and the kerneletc.
=== Device usage ===
To connect to the debug serial port: # connect the DB9 adapter bracket to the J22 connector on the SBCX board# connect The device can be mounted/accessed as 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,8,1standard block device in Linux.
----
[[Category:ETRA]]
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