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

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==GPIOs interface ==
 
==GPIOs interface ==
−
 
−
''TBD: sostituire le sezioni con le informazioni sull'uso della periferica e del suo connettore''
 
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''Nell'esempio di seguito c'è la descrizione dell'interfaccia UART/console''
 
  
 
=== Description  ===
 
=== Description  ===
  
−
The GPIOs interface available on the Evaluation Kit at the connector ''TBD:Jxxx''.  
+
STM32MP1 can handle external pins in many different ways and most of them can be configured as GPIOs. When a pin is set as a GPIO, it is possible to read its value, change its direction or change output value directly from the shell.  
−
 
 
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''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).
 
−
 
 
−
 
 
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[[File:{{{nome-som}}-EVB-GPIOs-connector.png|thumb|center|500px|GPIOs connector]]
 
  
 
===Signals ===
 
===Signals ===
  
−
The following table describes the interface signals:
+
The following table describes some GPIOs signals available on J12 (2x15x2.54mm) connector:
−
 
+
{| 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
−
! latexfontsize="scriptsize"| Pin name
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!Pin function
−
! latexfontsize="scriptsize"| Pin function
+
!Pin Notes
−
! latexfontsize="scriptsize"| Pin Notes
+
|-
 +
|3
 +
|J18.97
 +
|PD13
 +
|
 +
|
 +
|-
 +
|5
 +
|J18.99
 +
|PD12
 +
|
 +
|
 +
|-
 +
|6
 +
|J18.34
 +
|PB13
 +
|
 +
|
 +
|-
 +
|7
 +
|J18.101
 +
|PD11
 +
|
 +
|
 +
|-
 +
|8
 +
|J18.68
 +
|PB5
 +
|
 +
|
 +
|-
 +
|9
 +
|J18.105
 +
|PG9
 +
|
 +
|
 +
|-
 +
|12
 +
|J18.48
 +
|PA12
 +
|
 +
|
 +
|-
 +
|14
 +
|J18.38
 +
|PA11
 +
|
 +
|
 +
|-
 +
|18
 +
|J18.80
 +
|PF6
 +
|
 +
|
 +
|-
 +
|20
 +
|J18.76
 +
|PF9
 +
|
 +
|
 
|-
 
|-
−
|1,2,4,6,,7,8,10
+
|22
−
| -
+
|J18.74
−
| N.A.
+
|PF7
−
| N.C.
+
|
−
| Not connected
+
|
 
|-
 
|-
−
| 3
+
|24
−
| J1.189
+
|J18.78
−
| RS232_RX
+
|PF8
−
| Receive line
+
|
−
|  
+
|
 
|-
 
|-
−
| 3
+
|26
−
| J1.187
+
|J18.181
−
| RS232_TX
+
|PD6
−
| Transmit line
+
|
−
|  
+
|
 
|-
 
|-
−
| 9
+
|28
−
| -
+
|J18.28
−
| DGND
+
|PA9
−
| Ground
+
|
−
|  
+
|
 
|}
 
|}
  
 
=== 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.
+
GPIOs can be used directly on Linux kernel device driver or can be configured on the device tree.
  
 
=== Device usage ===
 
=== Device usage ===
  
−
To connect to the debug serial port:
+
See the [[ETRA SOM/DESK-MP1-L/Pheripherals/GPIOs|GPIOs]] page on the [[ETRA SOM/DESK-MP1-L|DESK-MX6-L]] Software Manual.
−
 
 
−
# 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 16:32, 31 December 2020

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History
Version Issue Date Notes
1.0.0 Dec 2020 First Release


GPIOs interface[edit | edit source]

Description[edit | edit source]

STM32MP1 can handle external pins in many different ways and most of them can be configured as GPIOs. When a pin is set as a GPIO, it is possible to read its value, change its direction or change output value directly from the shell.

Signals[edit | edit source]

The following table describes some GPIOs signals available on J12 (2x15x2.54mm) connector:

Pin# SOM Pin# Pin name Pin function Pin Notes
3 J18.97 PD13
5 J18.99 PD12
6 J18.34 PB13
7 J18.101 PD11
8 J18.68 PB5
9 J18.105 PG9
12 J18.48 PA12
14 J18.38 PA11
18 J18.80 PF6
20 J18.76 PF9
22 J18.74 PF7
24 J18.78 PF8
26 J18.181 PD6
28 J18.28 PA9

Device mapping[edit | edit source]

GPIOs can be used directly on Linux kernel device driver or can be configured on the device tree.

Device usage[edit | edit source]

See the GPIOs page on the DESK-MX6-L Software Manual.

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