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

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! style="border-left:solid 2px #73B2C7; border-right:solid 2px #73B2C7;border-top:solid 2px #73B2C7; border-bottom:solid 2px #73B2C7; background-color:#73B2C7; padding:5px; color:white" |Notes
 
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<section end="History" />
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<section begin="Body" />
  
 
==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 J4.  
  
−
''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).
+
J4 is a Micro-SD card header. This interface is connected to the SDMMC1 controller of the STM32MP1 CPU.
  
  
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The following table describes the interface signals:
 
The following table describes the interface signals:
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{| class="wikitable"
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{| class="wikitable"  
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!Pin#
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! latexfontsize="scriptsize"| Pin#
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!SOM Pin#
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! latexfontsize="scriptsize"| SOM Pin#
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!Pin name
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! latexfontsize="scriptsize"| Pin name
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!Pin function
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! latexfontsize="scriptsize"| Pin function
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!Pin Notes
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! latexfontsize="scriptsize"| Pin Notes
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|-
 +
|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
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|6, 10
 
| -
 
| -
−
| N.A.
+
|DGND
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| N.C.
+
|Ground
−
| Not connected
+
|
 
|-
 
|-
−
| 3
+
|7
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| J1.189
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|J18.75
−
| RS232_RX
+
|PC8
−
| Receive line
+
|Data 0
−
|  
+
|
 
|-
 
|-
−
| 3
+
|8
−
| J1.187
+
|J18.77
−
| RS232_TX
+
|PC9
−
| Transmit line
+
|Data 1
−
|  
+
|
 
|-
 
|-
−
| 9
+
|11, 12, 13, 14
 
| -
 
| -
−
| DGND
+
|SD_SHIELD
−
| Ground
+
|Shield
−
|  
+
|
 +
|-
 +
|9
 +
|J18.177
 +
|PE9
 +
|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:
+
The device can be mounted/accessed as a standard block device in Linux.
−
 
 
−
# 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
 
  
 
----
 
----
  
 
[[Category:ETRA]]
 
[[Category:ETRA]]

Revision as of 14:41, 31 December 2020

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History
Version Issue Date Notes
X.Y.Z Month Year TBD
[TBD_link X.Y.Z] Month Year TBD
... ... ...


micro SD interface[edit | edit source]

Description[edit | edit source]

The micro SD interface available on the Evaluation Kit at the connector J4.

J4 is a Micro-SD card header. This interface is connected to the SDMMC1 controller of the STM32MP1 CPU.


[[File:{Template:Nome-som-EVB-micro SD-connector.png|thumb|center|500px|micro SD connector]]

Signals[edit | edit source]

The following table describes the interface signals:

Pin# SOM Pin# Pin name Pin function 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
6, 10 - DGND Ground
7 J18.75 PC8 Data 0
8 J18.77 PC9 Data 1
11, 12, 13, 14 - SD_SHIELD Shield
9 J18.177 PE9 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]

The device can be mounted/accessed as a standard block device in Linux.

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