Difference between revisions of "AXEL Lite SOM/AXEL Lite Evaluation Kit/Interfaces and Connectors/micro SD"

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==micro SD interface ==
 
==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  ===
 
=== Description  ===
  
−
The micro SD interface available on the Evaluation Kit at the connector ''TBD:Jxxx''.  
+
The micro SD interface available on the Evaluation Kit at the connector J26.  
  
−
''Jxx'' is a ''TBD:connector-type'' header connector for the RS232 two-wires UART3 port, used for debug purposes (bootloader and operating system serial console).
+
J26 is a Micro-SD card header. This interface is connected to the USDHC1 controller of the i.MX6 CPU.
  
 
===Signals ===
 
===Signals ===
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! latexfontsize="scriptsize"| Pin Notes
 
! latexfontsize="scriptsize"| Pin Notes
 
|-
 
|-
−
|1,2,4,6,,7,8,10
+
| 1 || J10.79 || SD_DAT2 || Data 1||
−
| -
+
|-
−
| N.A.
+
| 2 || J10.81 || SD_DAT3 || Data 3||  
−
| N.C.
 
−
| Not connected
 
 
|-
 
|-
−
| 3
+
| 3 || J10.83 || SD_CMD || CMD||  
−
| J1.189
 
−
| RS232_RX
 
−
| Receive line
 
−
|  
 
 
|-
 
|-
−
| 3
+
| 4 || - || 3V3 || +3.3 V||  
−
| J1.187
 
−
| RS232_TX
 
−
| Transmit line
 
−
|  
 
 
|-
 
|-
−
| 9
+
| 5 || J10.85 || SD_CLK || Clock||
−
| -
+
|-
−
| DGND
+
| 6, 12 || - || DGND || Ground||
−
| Ground
+
|-
−
|  
+
| 7 || J10.75 || SD_DAT0 || Data 0||
 +
|-
 +
| 8 || J10.77 || SD_DAT1 || Data 1||
 +
|-
 +
| 9, 10, 11 || - || SD_SHIELD || Shield||
 +
|-
 +
| 13 || J10.177 || EIM_D19 || Card detect||  
 
|}
 
|}
  
 
=== Device mapping ===
 
=== Device mapping ===
−
UART3 is mapped to <code>/dev/ttymxc2</code> device in Linux. The peripheral is used as the default serial console, both for the bootloader and the kernel.
+
The microSD card is mapped to <code>/dev/mmcblk0</code>. The available partitions are available as <code>/dev/mmcblk0p1</code>, <code>/dev/mmcblk0p2</code>, etc.
  
 
=== Device usage ===
 
=== Device usage ===
−
 
−
To connect to the debug serial port:
 
−
 
−
# connect the DB9 adapter bracket to the J22 connector on the SBCX board
 
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# connect a serial cable between DB9 connector and PC COM port through a NULL-modem cable (not provided)
 
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# start your favorite terminal emulator software on PC (eg: PuTTY); communication parameters are: 115200,N,8,1
 
  
 
----
 
----
  
 
[[Category:AXEL Lite]]
 
[[Category:AXEL Lite]]

Revision as of 14:09, 16 October 2020

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History
Version Issue Date Notes
1.0.0 Oct 2020 First DESK release


micro SD interface[edit | edit source]

Description[edit | edit source]

The micro SD interface available on the Evaluation Kit at the connector J26.

J26 is a Micro-SD card header. This interface is connected to the USDHC1 controller of the i.MX6 CPU.

Signals[edit | edit source]

The following table describes the interface signals:

Pin# SOM Pin# Pin name Pin function Pin Notes
1 J10.79 SD_DAT2 Data 1
2 J10.81 SD_DAT3 Data 3
3 J10.83 SD_CMD CMD
4 - 3V3 +3.3 V
5 J10.85 SD_CLK Clock
6, 12 - DGND Ground
7 J10.75 SD_DAT0 Data 0
8 J10.77 SD_DAT1 Data 1
9, 10, 11 - SD_SHIELD Shield
13 J10.177 EIM_D19 Card detect

Device mapping[edit | edit source]

The microSD card is mapped to /dev/mmcblk0. The available partitions are available as /dev/mmcblk0p1, /dev/mmcblk0p2, etc.

Device usage[edit | edit source]

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