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OV7670 Camera Driver

sir_hugo

Hi, 

I'm having some trouble getting a device pointer for the OV7670 Camera. I've ported the OV7725 driver. It appears as if the program exits the driver before setting the I2C address:

drv_data->i2c = device_get_binding(DT_INST_BUS_LABEL(0));
printk("HERE!!!!!!!!!!!!!!!!!!!\n");
if (drv_data->i2c == NULL) {
LOG_ERR("Failed to get pointer to %s device!",
DT_INST_LABEL(0));
return -EINVAL;
}
printk("HERE!!!!!!!!!!!!!!!!!!!\n");
drv_data->i2c_addr = DT_INST_REG_ADDR(0);

I'm pretty sure I'm doing something but not entirely sure where.

  • 0 in reply to sir_hugo

    sure

     &i2c0 {
	compatible = "nordic,nrf-twim";
	status = "okay";
	ov7670@43 {
		compatible = "ovti,ov7670";
		label = "ov7670";
		reg = <0x43>;
		data-gpios = <&gpio0 0 (GPIO_PULL_UP | GPIO_ACTIVE_LOW)>,
			  <&gpio0 1 (GPIO_PULL_UP | GPIO_ACTIVE_LOW)>,
			  <&gpio0 5 (GPIO_PULL_UP | GPIO_ACTIVE_LOW)>,
			  <&gpio0 6 (GPIO_PULL_UP | GPIO_ACTIVE_LOW)>,
			  <&gpio0 7 (GPIO_PULL_UP | GPIO_ACTIVE_LOW)>,
			  <&gpio0 8 (GPIO_PULL_UP | GPIO_ACTIVE_LOW)>,
			  <&gpio0 9 (GPIO_PULL_UP | GPIO_ACTIVE_LOW)>,
			  <&gpio0 10 (GPIO_PULL_UP | GPIO_ACTIVE_LOW)>;       

		vsync-gpios = < &gpio0 15 (GPIO_PULL_UP | GPIO_ACTIVE_LOW) >;

   		hsync-gpios = < &gpio0 14 (GPIO_PULL_UP | GPIO_ACTIVE_LOW) >;

   		pclk-gpios = < &gpio0 13 (GPIO_PULL_UP | GPIO_ACTIVE_LOW) >;

   		xclk-gpios = < &gpio0 12 (GPIO_PULL_UP | GPIO_ACTIVE_LOW) >;
	};
};
    description: OV7670 CMOS video sensor

compatible: "ovti,ov7670"

properties:
    reset-gpios:
      type: phandle-array
      required: false
      description: |
        The RESETn pin is asserted to disable the sensor causing a hard
        reset.  The sensor receives this as an active-low signal.
    
    data-gpios:
      type: phandle-array
      required: false
    
    vsync-gpios:
      type: phandle-array
      required: false
    
    hsync-gpios:
      type: phandle-array
      required: false
    
    pclk-gpios:
      type: phandle-array
      required: false
    
    xclk-gpios:
      type: phandle-array
      required: false

include: i2c-device.yaml

  • 0 in reply to sir_hugo

    I am sorry, Due to start of holiday season and my travel  I could not respond to you meanwhile, I will try to respond to you by Friday.

    Thanks for your patience

  • 0

    I have reviewed your changes and nothing seems to comeout as the culprit for this behavior.

    if you have "zephyr_library()" in your CMakeLists.txt file, and check if your driver is properly initialized. You can do this by starting your program in the debug mode to see if the driver exits with no errors.

  • 0

    Turns out I was missing an external clock for the camera

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