Difference between revisions of "RIALTO SBC/Interfaces and Connectors/Led and buttons"
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=== Description === | === Description === | ||
| − | RIALTO SBC can drive up to | + | RIALTO SBC can drive up to six leds and detect two key buttons at the expansion connector J70. |
| − | + | J70 is a 10x1x2.54mm pin strip header connector. | |
| − | [[File:RIALTO_SBC-J70-connector.png|thumb|center|500px|Led and buttons connector ( | + | [[File:RIALTO_SBC-J70-connector.png|thumb|center|500px|Led and buttons connector (J70)]] |
===Signals === | ===Signals === | ||
| − | The following table describes the | + | The six LED output are driven by a PCA9551PW integrated circuit. In the following table describes the IC output pins to the connector J70: |
{| class="wikitable" | {| class="wikitable" | ||
! latexfontsize="scriptsize" |Pin# | ! latexfontsize="scriptsize" |Pin# | ||
! latexfontsize="scriptsize" |Pin name | ! latexfontsize="scriptsize" |Pin name | ||
| − | ! latexfontsize="scriptsize" | | + | ! latexfontsize="scriptsize" |PCA9551 output |
| − | ! | + | !PCA9551 pin |
| − | |||
|- | |- | ||
|1 | |1 | ||
| − | | | + | |3V3_IO |
| − | |||
| | | | ||
| | | | ||
|- | |- | ||
|2 | |2 | ||
| − | | | + | |AUX_LED0 |
| − | + | |LED7 | |
| − | | | + | |12 |
| − | | | ||
|- | |- | ||
|3 | |3 | ||
| − | | | + | |AUX_LED1 |
| − | + | |LED6 | |
| − | | | + | |11 |
| − | | | ||
|- | |- | ||
|4 | |4 | ||
| − | | | + | |AUX_LED2 |
| − | + | |LED5 | |
| − | | | + | |10 |
| − | | | ||
|- | |- | ||
|5 | |5 | ||
| − | | | + | |AUX_LED3 |
| − | | | + | |LED4 |
| − | + | |9 | |
| − | | | ||
|- | |- | ||
|6 | |6 | ||
| − | | | + | |AUX_LED4 |
| − | | | + | |LED0 |
| − | + | |4 | |
| − | | | ||
|- | |- | ||
|7 | |7 | ||
| − | | | + | |AUX_LED5 |
| − | | | + | |LED1 |
| − | | | + | |5 |
| + | |- | ||
| + | |10 | ||
| + | |DGND | ||
| | | | ||
| + | | | ||
| + | |} | ||
| + | |||
| + | The two KEY input are connected to the i.MX6UL SoC or (optionally) to the PCA9551PW IC. The following table describes the interface signals: | ||
| + | |||
| + | {| class="wikitable" | ||
| + | ! latexfontsize="scriptsize" |Pin# | ||
| + | ! latexfontsize="scriptsize" |Pin name | ||
| + | ! latexfontsize="scriptsize" |PCA9551 input | ||
| + | !PCA9551 pin | ||
| + | !GPIO | ||
|- | |- | ||
|8 | |8 | ||
| − | | | + | |LCD_RESET |
| − | | | + | |LED2 |
| − | | | + | |6 |
| − | | | + | |GPIO3_IO04 |
|- | |- | ||
|9 | |9 | ||
| − | | | + | |LCD_ENABLE |
| − | | | + | |LED3 |
| − | + | |7 | |
| − | + | |GPIO3_IO01 | |
| − | |||
| − | |||
| − | |||
| − | |||
| − | | | ||
| − | | | ||
|} | |} | ||
| Line 101: | Line 102: | ||
=== Device mapping === | === Device mapping === | ||
| − | + | The led are mapped to a sysfs led class interface. The button are mapped to the input event device handler. | |
| − | |||
| − | |||
=== Device usage === | === Device usage === | ||
| − | Under Linux the | + | Under Linux: |
| − | + | * the LEDs can be manipulated via <code>/sys/class/leds/pca955x</code> ''syfs'' interface | |
| + | * the KEY buttons can be detected via <code>/dev/input/event1</code> input devices | ||
| + | ** KEY0 is mapped to <code>KEY_F1</code> | ||
| + | ** KEY1 is mapped to <code>KEY2</code> | ||
| + | ** the mapping can be easily modified in the device tree file | ||
| + | <section end="Body" /> | ||
[[Category:RIALTO SBC]] | [[Category:RIALTO SBC]] | ||
Revision as of 18:12, 13 January 2024
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| History | |||
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Contents
Led and buttons connector[edit | edit source]
Description[edit | edit source]
RIALTO SBC can drive up to six leds and detect two key buttons at the expansion connector J70.
J70 is a 10x1x2.54mm pin strip header connector.
Signals[edit | edit source]
The six LED output are driven by a PCA9551PW integrated circuit. In the following table describes the IC output pins to the connector J70:
| Pin# | Pin name | PCA9551 output | PCA9551 pin |
|---|---|---|---|
| 1 | 3V3_IO | ||
| 2 | AUX_LED0 | LED7 | 12 |
| 3 | AUX_LED1 | LED6 | 11 |
| 4 | AUX_LED2 | LED5 | 10 |
| 5 | AUX_LED3 | LED4 | 9 |
| 6 | AUX_LED4 | LED0 | 4 |
| 7 | AUX_LED5 | LED1 | 5 |
| 10 | DGND |
The two KEY input are connected to the i.MX6UL SoC or (optionally) to the PCA9551PW IC. The following table describes the interface signals:
| Pin# | Pin name | PCA9551 input | PCA9551 pin | GPIO |
|---|---|---|---|---|
| 8 | LCD_RESET | LED2 | 6 | GPIO3_IO04 |
| 9 | LCD_ENABLE | LED3 | 7 | GPIO3_IO01 |
All the GPIO signals are 0-3.3V level.
Device mapping[edit | edit source]
The led are mapped to a sysfs led class interface. The button are mapped to the input event device handler.
Device usage[edit | edit source]
Under Linux:
- the LEDs can be manipulated via
/sys/class/leds/pca955xsyfs interface - the KEY buttons can be detected via
/dev/input/event1input devices- KEY0 is mapped to
KEY_F1 - KEY1 is mapped to
KEY2 - the mapping can be easily modified in the device tree file
- KEY0 is mapped to
