OV7670 Camera Driver

RE: OV7670 Camera Driver

sir_hugo — Tue, 18 Jan 2022 10:14:59 GMT

Turns out I was missing an external clock for the camera

RE: OV7670 Camera Driver

Susheel Nuguru — Mon, 20 Dec 2021 07:47:29 GMT

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.

RE: OV7670 Camera Driver

Susheel Nuguru — Wed, 15 Dec 2021 19:15:00 GMT

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

RE: OV7670 Camera Driver

sir_hugo — Wed, 08 Dec 2021 13:18:09 GMT

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

RE: OV7670 Camera Driver

Susheel Nuguru — Wed, 08 Dec 2021 13:06:04 GMT

Can you please also attach your dts file so that i get a better picture in how your declared your instances.

RE: OV7670 Camera Driver

sir_hugo — Wed, 08 Dec 2021 12:50:45 GMT

Oh I forgot I was using CONFIG_I2C=y instead of CONFIG_I2C_0=y to debug. The runtime error that the main.c is returning dev=null after device_get_binding("ov7670")

const struct device *dev = device_get_binding("ov7670");
if (dev == NULL) {
printk("Error: Could not get ov7670 device binding\n");
return 0;
}

This is the camera init function

static int ov7670_init_0(const struct device *dev)
{
	struct ov7670_data *drv_data = dev->data;

    
	drv_data->i2c = device_get_binding(DT_INST_BUS_LABEL(0));
    printk("HERE!!!!!!! %s !!!!!!!!!!!!\n",DT_INST_REG_ADDR(0));
	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 = device_get_binding(DT_INST_REG_ADDR(0));

    
	return ov7670_init(dev);
	
}

RE: OV7670 Camera Driver

Susheel Nuguru — Wed, 08 Dec 2021 11:42:10 GMT

Yes it seems that your I2C address that you mentioned in the device tree does not seem to be visible to your project. Check if those settings in the board overlay are shielded by some other config settings that you missed to enable.

RE: OV7670 Camera Driver

sir_hugo — Wed, 08 Dec 2021 09:36:52 GMT

I havce a very basic application where I'm trying to get a device pointer to the camera using device_get_binding() but it's not working. When I try to print out DT_INST_REG_ADDR(0) I'm getting this error missinglog_strdup(). Does that mean it isn't picking the I2C address from my board overay?

RE: OV7670 Camera Driver

Susheel Nuguru — Wed, 08 Dec 2021 08:23:56 GMT

Hi,

We do not have this camera sensor So it is hard to test anything, but based on your description, it seems like you are missing KConfig settings being enabled.

What kind of trouble are you seeing? is it a compilation error or other run time errors?