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products:sbc:common:applications:gpio:i2c

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products:sbc:common:applications:gpio:i2c [2022/07/12 23:15]
nick [Table]
products:sbc:common:applications:gpio:i2c [2023/11/07 04:51] (current)
nick [Enable I2C]
Line 3: Line 3:
 ===== Introduction ===== ===== Introduction =====
  
-This document mainly introduces the usage of I2C bus on [[products:sbc:common:applications:gpio:40pin-header|40-Pin Header]].+This page introduces the usage of I2C bus on [[products:sbc:common:applications:gpio:40pin-header|40-Pin Header]].
  
 ===== I2C Information ===== ===== I2C Information =====
  
-<tabbox VIM1/2>+|            I2C      PIN      ^  GPIO Name  ^  DT Overlays Node  ^  Bus Number  ^  Device Node  ^ 
 +^  VIM1/  |  I2C A    22(SCL)  |  GPIODV_25  |  i2c0              |  0            /dev/i2c-0   | 
 +| :::       | :::      |  23(SDA)  |  GPIODV_24  | :::                | :::          | :::           | 
 +| :::        I2C B    25(SCL)  |  GPIODV_27  |  -                  1            /dev/i2c-1   | 
 +| :::       | :::      |  26(SDA)  |  GPIODV_26  | :::                | :::          | :::           | 
 +^  VIM3/3L  |  I2CM 3  |  22(SCL)  |  GPIOA_15    i2c3              |  3            /dev/i2c-3   | 
 +| :::       | :::      |  23(SDA)  |  GPIOA_14   | :::                | :::          | :::           | 
 +| :::        I2C AO  |  25(SCL)  |  GPIOAO_2    -                  4            /dev/i2c-4   | 
 +| :::       | :::      |  26(SDA)  |  GPIOAO_3   | :::                | :::          | :::           | 
 +^  VIM4      I2CM F  |  22(SCL)  |  GPIOY_17    i2cm_f            |  5            /dev/i2c-5   | 
 +| :::       | :::      |  23(SDA)  |  GPIOY_18   | :::                | :::          | :::           | 
 +| :::        I2CM A  |  25(SCL)  |  GPIOT_20    i2cm_a            |  0            /dev/i2c-0   | 
 +| :::       | :::      |  26(SDA)  |  GPIOT_21   | :::                | :::          | :::           | 
 +^  VIM1S    |  I2CM B  |  22(SCL)  |  GPIOD_7    |  -                  1            /dev/i2c-1   | 
 +| :::       | :::      |  23(SDA)  |  GPIOD_6    | :::                | :::          | :::           | 
 +| :::        I2CM E  |  25(SCL)  |  GPIOZ_11    i2cm_e            |  4            /dev/i2c-4   | 
 +| :::       | :::      |  26(SDA)  |  GPIOZ_12   | :::                | :::          | :::           |
  
-|            I2C    ^  PIN & GPIO(#number)                                        DT Overlays Node  ^  Bus Number  ^  Device Node  ^ +===== Enable I2C =====
-^  VIM1/  | I2C A    SCL(22) - GPIODV_25 (#474)\\ SDA (23) - GPIODV_24 (#473)  |  i2c0              |  0            /dev/i2c-0   | +
-^  :::      | I2C B    SCL(25) - GPIODV_27 (#476)\\ SDA(26) - GPIODV_26 (#475)    -                  1            /dev/i2c-1   | +
-^  VIM3/3L  | I2CM 3  |  SCL(22) - GPIOA_15 (#475)\\ SDA(23) - GPIOA_14 (#474)      i2c3              |  3            /dev/i2c-3   | +
-^  :::      | I2C AO  |  SCL(25) - GPIOAO_2 (#498)\\ SDA(26) - GPIOAO_3 (#499)      -                  4            /dev/i2c-4   | +
-^  VIM4     | I2CM F  |  SCL(22) - GPIOY_17 (#501)\\ SDA (23) - GPIOY_18 (#502)    |  i2cm_f            |  5            /dev/i2c-5   | +
-^  :::      | I2CM A  |  SCL(25) - GPIOT_20 (#466)\\ SDA(26) - GPIOT_21 (#467)      i2cm_a            |  0            /dev/i2c-0   | +
- +
- +
-<tabbox VIM3/3L> +
- +
-^  I2C    ^  PIN & GPIO Number                                      DT Overlays Node  ^  Bus Number  ^  Device Node  ^ +
-| I2CM 3  | SCL(22) - GPIOA_15 (#475)\\ SDA(23) - GPIOA_14 (#474)  |  i2c3              |  3            /dev/i2c-3   | +
-| I2C AO  | SCL(25) - GPIOAO_2 (#498)\\ SDA(26) - GPIOAO_3 (#499)  |  -                  4            /dev/i2c-4   | +
- +
-<tabbox VIM4> +
- +
-^  I2C    ^  PIN & GPIO Number                                      ^  DT Overlays Node  ^  Bus Number  ^  Device Node  ^ +
-| I2CM F  | SCL(22) - GPIOY_17 (#501)\\ SDA (23) - GPIOY_18 (#502)  |  i2cm_f            |  5            /dev/i2c-5   | +
-| I2CM A  | SCL(25) - GPIOT_20 (#466)\\ SDA(26) - GPIOT_21 (#467)    i2cm_a            |  0            /dev/i2c-0   | +
- +
- +
-</tabbox> +
- +
-===== Enabel I2C =====+
  
 In order to use the I2C, you need to enable the I2C function via [[products:sbc:common:configurations:device-tree-overlay|Device Tree Overlay]]. In order to use the I2C, you need to enable the I2C function via [[products:sbc:common:configurations:device-tree-overlay|Device Tree Overlay]].
Line 53: Line 45:
 /dev/i2c-3 /dev/i2c-3
 ``` ```
 +
 +<tabbox VIM3 with 5.15 kernel>
 +
 +Edit ''/boot/dtb/amlogic/kvim3.dtb.overlay.env'' to add i2c node to ''fdt_overlays'' node if it doesn't exist.
 +
 +
 +e.g. To enable ''I2CM 3'', you need to add ''i2c3'' to node ''fdt_overlays'' if it doesn't exist.
 +
 +```shell
 +fdt_overlays=i2c3
 +
 +```
 +
 +After reboot, you will see the I2C device node.
 +
 +<tabbox VIM3L with 5.15 kernel>
 +
 +Edit ''/boot/dtb/amlogic/kvim3l.dtb.overlay.env'' to add i2c node to ''fdt_overlays'' node if it doesn't exist.
 +
 +
 +e.g. To enable ''I2CM 3'', you need to add ''i2c3'' to node ''fdt_overlays'' if it doesn't exist.
 +
 +```shell
 +fdt_overlays=i2c3
 +
 +```
 +
 +After reboot, you will see the I2C device node.
  
 <tabbox VIM4> <tabbox VIM4>
Line 59: Line 79:
  
  
-e.g. Enable ''I2CM A'', you need to add ''i2cm_a'' to node ''fdt_overlays'' if it doesn't exist.+e.g. To enable ''I2CM A'', you need to add ''i2cm_a'' to node ''fdt_overlays'' if it doesn't exist.
  
 ```shell ```shell
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 $ ls /dev/i2c-0 $ ls /dev/i2c-0
 /dev/i2c-0 /dev/i2c-0
 +```
 +
 +<tabbox VIM1S>
 +
 +Edit ''/boot/dtb/amlogic/kvim1s.dtb.overlay.env'' to add i2c node to ''fdt_overlays'' node if it doesn't exist.
 +
 +
 +e.g. To enable ''I2CM E'', you need to add ''i2cm_e'' to node ''fdt_overlays'' if it doesn't exist.
 +
 +```shell
 +fdt_overlays=i2cm_e
 +
 +```
 +
 +After reboot, you will see the I2C device node.
 +
 +```shell
 +$ ls /dev/i2c-4
 +/dev/i2c-4
 ``` ```
  
 </tabbox> </tabbox>
 +
 +===== I2C Usage =====
 +
 +Please check the [[https://manpages.ubuntu.com/manpages/jammy/en/man8/i2cdetect.8.html|I2C Usage]].
  
  
 ===== Disable I2C to Use GPIO ===== ===== Disable I2C to Use GPIO =====
  
-If you want to use normal GPIO instead of I2C, you can remove the I2C node in device tree overlays configration file+If you want to use normal GPIO instead of I2C, you can remove the I2C node in [[products:sbc:common:configurations:device-tree-overlay|Device Tree Overlay]]
Last modified: 2022/07/12 23:15 by nick