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products:sbc:common:applications:gpio:spi

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products:sbc:common:applications:gpio:spi [2022/10/07 23:11]
hyphop [Introduction] 		products:sbc:common:applications:gpio:spi [2025/02/17 21:40] (current)
nick [Enable SPI]
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-====== SPI ====== 
  
-SPI interface usage examples on [[products:sbc:common:applications:gpio:40pin-header|40-Pin Header]]. +===== SPI Reference table =====
- +
-===== Reference table ===== +
- +
-|           ^  SPI    ^  PIN            ^ GPIO name  ^ GPIO num  ^  DT overlay node  ^  Device node     ^ +
-^  VIM3/3L  |  SPI_B  |  15 SPIB_SS    |  GPIOH_6   |  433         |  spi1              |  /dev/spidev1.1  | +
-| :::       | :::     |  16 SPIB_SCLK  |  GPIOH_7   |  434         | :::                | :::              | +
-| :::       | :::     |  35 SPIB_MISO  |  GPIOH_5   |  432         | :::                | :::              | +
-| :::       | :::     |  37 SPIB_MOSI  |  GPIOH_4   |  431         | :::                | :::              | +
-^  VIM4     |         |                 |            |              |                    |                  |+
  
 +|           ^  SPI    ^ Pin  ^ Pin name     ^  GPIO name  ^  DT overlay node  ^  Device node     ^
 +^  VIM3/3L  |  SPI_B  |  15  | SPIB_SS      |  GPIOH_6    |  spi1             |  /dev/spidev2.1  |
 +| :::       | :::     |  16  | SPIB_SCLK    |  GPIOH_7    | :::               | :::              |
 +| :::       | :::     |  35  | SPIB_MISO    |  GPIOH_5    | :::               | :::              |
 +| :::       | :::     |  37  | SPIB_MOSI    |  GPIOH_4    | :::               | :::              |
 +^  VIM4     |  SPI_A  |  25  |  SPI_A_SCLK  |  GPIOT_20   |  spi0             |  /dev/spidev1.0  |
 +| :::       | :::     |  26  |  SPI_A_SS0   |  GPIOT_21   | :::               | :::              |
 +| :::       | :::     |  36  |  SPI_A_MOSI  |  GPIOT_18   | :::               | :::              |
 +| :::       | :::     |  37  |  SPI_A_MISO  |  GPIOT_19   | :::               | :::              |
 +^  VIM1S    |  SPI_A  |  29  |  SPI_A_MOSI  |  GPIOZ_1    | :::               | :::              |
 +| :::       | :::     |  31  |  SPI_A_CLK   |  GPIOZ_2    | :::               | :::              |
 +| :::       | :::     |  32  |  SPI_A_MISO  |  GPIOZ_0    | :::               | :::              |
 +| :::       | :::     |  33  |  SPI_A_SS0   |  GPIOZ_3    | :::               | :::              |
  
 ===== Enable SPI ===== ===== Enable SPI =====
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 In order to use the SPI, you need to enable the SPI function via [[products:sbc:common:configurations:device-tree-overlay|Device Tree Overlay]]. In order to use the SPI, you need to enable the SPI function via [[products:sbc:common:configurations:device-tree-overlay|Device Tree Overlay]].
  
-<tabbox VIM1/2/3/3L/Edge1>+<tabbox VIM3/3L/Edge1>
  
 Edit ''/boot/env.txt'' to add the SPI node to ''overlays'' node if it doesn't exist. Edit ''/boot/env.txt'' to add the SPI node to ''overlays'' node if it doesn't exist.
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 $ ls /dev/spidev1.1 $ ls /dev/spidev1.1
 /dev/spidev1.1 /dev/spidev1.1
 +```
 +
 +<tabbox VIM3 with 5.15 kernel>
 +
 +Edit ''/boot/dtb/amlogic/kvim3.dtb.overlay.env'' to add spi node to ''fdt_overlays'' node if it doesn't exist.
 +
 +
 +e.g. Enable ''SPI_B'', you need to add ''spi1'' to node ''fdt_overlays'' if it doesn't exist.
 +
 +```shell
 +fdt_overlays=spi1
 +```
 +
 +After reboot, you will see the SPI device node.
 +
 +```shell
 +$ ls /dev/spidev2.1 
 +/dev/spidev2.1
 +```
 +
 +<tabbox VIM3L with 5.15 kernel>
 +
 +Edit ''/boot/dtb/amlogic/kvim3l.dtb.overlay.env'' to add spi node to ''fdt_overlays'' node if it doesn't exist.
 +
 +
 +e.g. Enable ''SPI_B'', you need to add ''spi1'' to node ''fdt_overlays'' if it doesn't exist.
 +
 +```shell
 +fdt_overlays=spi1
 +
 +```
 +
 +After reboot, you will see the SPI device node.
 +
 +```shell
 +$ ls /dev/spidev2.1 
 +/dev/spidev2.1
 ``` ```
  
 <tabbox VIM4> <tabbox VIM4>
  
-TODO.+Edit ''/boot/dtb/amlogic/kvim4.dtb.overlay.env'' to add spi node to ''fdt_overlays'' node if it doesn't exist.
  
-</tabbox> 
  
 +e.g. Enable ''SPI_A'', you need to add ''spi0'' to node ''fdt_overlays'' if it doesn't exist.
 +
 +```shell
 +fdt_overlays=spi0
 +
 +```
 +
 +After reboot, you will see the SPI device node.
 +
 +```shell
 +$ ls /dev/spidev1.0 
 +/dev/spidev1.0
 +```
 +<tabbox VIM1S>
 +
 +Edit ''/boot/dtb/amlogic/kvim1s.dtb.overlay.env'' to add spi node to ''fdt_overlays'' node if it doesn't exist.
 +
 +
 +e.g. Enable ''SPI_A'', you need to add ''spi0'' to node ''fdt_overlays'' if it doesn't exist.
 +
 +```shell
 +fdt_overlays=spi0
 +
 +```
 +
 +After reboot, you will see the SPI device node.
 +
 +```shell
 +$ ls /dev/spidev1.0 
 +/dev/spidev1.0
 +```
 +
 +</tabbox>
  
-===== Disable SPI to Use GPIO =====+===== Disable SPI =====
  
 If you want to use normal GPIO instead of SPI, you can remove the SPI node in [[products:sbc:common:configurations:device-tree-overlay|Device Tree Overlay]].  If you want to use normal GPIO instead of SPI, you can remove the SPI node in [[products:sbc:common:configurations:device-tree-overlay|Device Tree Overlay]]. 
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 ===== Demo Source Code ===== ===== Demo Source Code =====
- 
-**Get test code.** 
  
 ```c spidev_test.c ```c spidev_test.c
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 } }
  
-static const char *device = "/dev/spidev1.1";+static const char *device = "/dev/spidev1.0";
 static uint32_t mode; static uint32_t mode;
 static uint8_t bits = 8; static uint8_t bits = 8;
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 ``` ```
  
-**Compile test code.**+Compile test code:
  
 ```shell ```shell
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 ``` ```
  
-===== Demonstrate =====+===== Test demonstration =====
  
- +Prepare input text file:
-**Prepare a text file.**+
  
 ```shell ```shell
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 ``` ```
  
-**Run ''spidev_test''.**+Connect PIN36(MOSI), PIN37(MISO) then run ''spidev_test'': 
 + 
  
 ```shell ```shell
-$ ./spidev_test -i spi_in.txt -o ./spi_out.txt+$ ./spidev_test -D /dev/spidev1.1 -i spi_in.txt -o ./spi_out.txt
 spi mode: 0x0 spi mode: 0x0
 bits per word: 8 bits per word: 8
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 ``` ```
  
-**Check output data.**+<WRAP important > 
 +Please choose the correct spi device node. 
 +</WRAP> 
 + 
 + 
 +Check output data:
  
 ```shell ```shell
Last modified: 2022/10/07 23:11 by hyphop

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