nRF5340 - DAC driver in Zephyr

[Gabriele]

Hi,

to develop a device driver in Zephyr for TI DAC80501, a 16-bit DAC, I2C interface,

I have to

1. add the dts child node under the i2c controller node

  $i2c1 {
       dac80501@48 {
           compatible = "ti,dac80501";
           reg = <0x48>;
       };
  };

2. find a devicetree binding corresponding to the node's compatible property
3. write the driver in zephyr/drivers/adc/

Could anybody help me following through 2. and 3.

Thank you

[Gabriele]

Thank you, I definitely agree with your remark.
My device is a DAC, then putting the driver into <zephyr>/drivers/dac is more appropriate.
Hereinafter the complete process

1) Under <zephyr>/drivers/dac/ add files

 dac_dacx0501.c
 dac_dacx0501.h
 Kconfig.dacx0501

2) In <zephyr>/drivers/dac/CMakeLists.txt add the line

 zephyr_library_sources_ifdef(CONFIG_DAC_DACX0501    dac_dacx0501.c)

3) In <zephyr>/drivers/dac/Kconfig add the line

 source "drivers/dac/Kconfig.dacx0501"

4) In dac_dacx0501.c implement the I2C read/write functions

 int dacx501_reg_read()  to read a register
 int dacx501_reg_write() to overwrite a register
 int dacx501_init()  to initialize the driver and the device
 int dacx501_channel_setup() the standard API to open a DAC channel (I have only one)
 int dacx501_write_value() the standard API to write a value to DAC

As for the application side <src>/main.c

5) Include

 #include <include/device.h>
 #include <dac.h>

6) Retrieve the device structure for a the DAC driver by name using

 struct device* device_get_binding()

7) Create the structure for specifying the configuration of the DAC channel

 struct dac_channel_cfg

8) Use it to configure the DAC channel with

 int dac_channel_setup()

9) Finally you are able to write data to the DAC using

 int dac_write_value()

Gabriele