Difference between revisions of "Spi device tree source code"

Revision as of 22:59, 11 August 2022

2022-08-11 Thursday

Notes on SPI device tree source, with goal to add SPI device to modified RPi Pico DTS files, which build firmware to run on Sparkfun DEV-18288 board.

In Zephyr RTOS' supported board dts files we find SPI peripherals defined for several boards. Here are excerpts

Excerpt 1 - zephyr/boards/arm/sparkfun_thing_plus_nrf9160/sparkfun_thing_plus_nrf9160_common.dts


&spi3 {
        compatible = "nordic,nrf-spim";
        status = "okay";
        cs-gpios = <&gpio0 7 GPIO_ACTIVE_LOW>;
        pinctrl-0 = <&spi3_default>;
        pinctrl-1 = <&spi3_sleep>;
        pinctrl-names = "default", "sleep";
        w25q32jv: w25q32jv@0 {
                compatible = "jedec,spi-nor";
                label = "W25Q32JV";
                reg = <0>;
                spi-max-frequency = <40000000>;
                wp-gpios = <&gpio0 8 GPIO_ACTIVE_LOW>;
                hold-gpios = <&gpio0 10 GPIO_ACTIVE_LOW>;
                size = <0x2000000>;
                has-dpd;
                t-enter-dpd = <3000>;
                t-exit-dpd = <30000>;
                jedec-id = [ ef 40 16 ];
        };
};

 81         spi3_default: spi3_default {
 82                 group1 {
 83                         psels = <NRF_PSEL(SPIM_SCK, 0, 11)>,
 84                                 <NRF_PSEL(SPIM_MOSI, 0, 9)>,
 85                                 <NRF_PSEL(SPIM_MISO, 0, 28)>;
 86                 };
 87         };
 88 
 89         spi3_sleep: spi3_sleep {
 90                 group1 {
 91                         psels = <NRF_PSEL(SPIM_SCK, 0, 11)>,
 92                                 <NRF_PSEL(SPIM_MOSI, 0, 9)>,
 93                                 <NRF_PSEL(SPIM_MISO, 0, 28)>;
 94                         low-power-enable;
 95                 };
 96         };

Excerpt 2 - zephyr/boards/arm/96b_carbon_nrf51/96b_carbon_nrf51.dts

&spi1 { compatible = "nordic,nrf-spis"; status = "okay"; def-char = <0x00>; pinctrl-0 = <&spi1_default>; pinctrl-names = "default"; bt-hci@0 { compatible = "zephyr,bt-hci-spi-slave"; reg = <0>; irq-gpios = <&gpio0 28 (GPIO_ACTIVE_HIGH | GPIO_PULL_DOWN)>; }; };

Excerpt 3 -

Excerpt 4 -

Excerpt 5 -

^ YAML device bindings files
To support a typical development kit or custom board with multiple peripherals we need a device bindings file comparable to this ... bindings file:
~/projects-sandbox/workspace-for-rpi/zephyr/boards/arm/nrf9160dk_nrf9160/nrf9160dk_nrf9160.yaml
identifier: nrf9160dk_nrf9160 name: nRF9160-DK-NRF9160 type: mcu arch: arm toolchain: - gnuarmemb - xtools - zephyr ram: 88 flash: 256 supported: - arduino_gpio - arduino_i2c - gpio - i2c - pwm - spi - watchdog - counter

@@ Line 88: / Line 88: @@
-<i>Excerpt 2 - <i>
+<i>Excerpt 2 - zephyr/boards/arm/96b_carbon_nrf51/96b_carbon_nrf51.dts<i>
 {|
 | style="background:#ffffff; vertical-align:top; padding:10px;" |
+<pre>
+</pre>
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+<pre>
+&spi1 {
+        compatible = "nordic,nrf-spis";
+        status = "okay";
+        def-char = <0x00>;
+        pinctrl-0 = <&spi1_default>;
+        pinctrl-names = "default";
+        bt-hci@0 {
+                compatible = "zephyr,bt-hci-spi-slave";
+                reg = <0>;
+                irq-gpios = <&gpio0 28 (GPIO_ACTIVE_HIGH | GPIO_PULL_DOWN)>;
+        };
+};
+</pre>
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+<pre>
+</pre>
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+<pre>
+</pre>
 |}
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+</pre>
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+<pre>
+</pre>
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+<pre>
+</pre>
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+<pre>
+</pre>
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+<pre>
+</pre>
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+<pre>
+</pre>
 |}

Difference between revisions of "Spi device tree source code"

Revision as of 22:59, 11 August 2022

^ YAML device bindings files

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