C/C++ - UV Light Bricklet 2.0

This is the description of the C/C++ API bindings for the UV Light Bricklet 2.0. General information and technical specifications for the UV Light Bricklet 2.0 are summarized in its hardware description.

An installation guide for the C/C++ API bindings is part of their general description.

Examples

The example code below is Public Domain (CC0 1.0).

Callback

Download (example_callback.c)

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#include <stdio.h>

#include "ip_connection.h"
#include "bricklet_uv_light_v2.h"

#define HOST "localhost"
#define PORT 4223
#define UID "XYZ" // Change XYZ to the UID of your UV Light Bricklet 2.0

// Callback function for UV index callback
void cb_uvi(int32_t uvi, void *user_data) {
    (void)user_data; // avoid unused parameter warning

    printf("UV Index: %f\n", uvi/10.0);
}

int main(void) {
    // Create IP connection
    IPConnection ipcon;
    ipcon_create(&ipcon);

    // Create device object
    UVLightV2 uvl;
    uv_light_v2_create(&uvl, UID, &ipcon);

    // Connect to brickd
    if(ipcon_connect(&ipcon, HOST, PORT) < 0) {
        fprintf(stderr, "Could not connect\n");
        return 1;
    }
    // Don't use device before ipcon is connected

    // Register UV index callback to function cb_uvi
    uv_light_v2_register_callback(&uvl,
                                  UV_LIGHT_V2_CALLBACK_UVI,
                                  (void *)cb_uvi,
                                  NULL);

    // Set period for UVI callback to 1s (1000ms) without a threshold
    uv_light_v2_set_uvi_callback_configuration(&uvl, 1000, false, 'x', 0, 0);

    printf("Press key to exit\n");
    getchar();
    uv_light_v2_destroy(&uvl);
    ipcon_destroy(&ipcon); // Calls ipcon_disconnect internally
    return 0;
}

Threshold

Download (example_threshold.c)

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#include <stdio.h>

#include "ip_connection.h"
#include "bricklet_uv_light_v2.h"

#define HOST "localhost"
#define PORT 4223
#define UID "XYZ" // Change XYZ to the UID of your UV Light Bricklet 2.0

// Callback function for UV index callback
void cb_uvi(int32_t uvi, void *user_data) {
    (void)user_data; // avoid unused parameter warning

    printf("UV Index: %f\n", uvi/10.0);
    printf("UV index > 3. Use sunscreen!\n");
}

int main(void) {
    // Create IP connection
    IPConnection ipcon;
    ipcon_create(&ipcon);

    // Create device object
    UVLightV2 uvl;
    uv_light_v2_create(&uvl, UID, &ipcon);

    // Connect to brickd
    if(ipcon_connect(&ipcon, HOST, PORT) < 0) {
        fprintf(stderr, "Could not connect\n");
        return 1;
    }
    // Don't use device before ipcon is connected

    // Register UV index callback to function cb_uvi
    uv_light_v2_register_callback(&uvl,
                                  UV_LIGHT_V2_CALLBACK_UVI,
                                  (void *)cb_uvi,
                                  NULL);

    // Configure threshold for UV index "greater than 3"
    // with a debounce period of 1s (1000ms)
    uv_light_v2_set_uvi_callback_configuration(&uvl, 1000, false, '>', 3*10, 0);

    printf("Press key to exit\n");
    getchar();
    uv_light_v2_destroy(&uvl);
    ipcon_destroy(&ipcon); // Calls ipcon_disconnect internally
    return 0;
}

Simple

Download (example_simple.c)

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#include <stdio.h>

#include "ip_connection.h"
#include "bricklet_uv_light_v2.h"

#define HOST "localhost"
#define PORT 4223
#define UID "XYZ" // Change XYZ to the UID of your UV Light Bricklet 2.0

int main(void) {
    // Create IP connection
    IPConnection ipcon;
    ipcon_create(&ipcon);

    // Create device object
    UVLightV2 uvl;
    uv_light_v2_create(&uvl, UID, &ipcon);

    // Connect to brickd
    if(ipcon_connect(&ipcon, HOST, PORT) < 0) {
        fprintf(stderr, "Could not connect\n");
        return 1;
    }
    // Don't use device before ipcon is connected

    // Get current UV-A
    int32_t uva;
    if(uv_light_v2_get_uva(&uvl, &uva) < 0) {
        fprintf(stderr, "Could not get UV-A, probably timeout\n");
        return 1;
    }

    printf("UV-A: %f mW/m²\n", uva/10.0);

    // Get current UV-B
    int32_t uvb;
    if(uv_light_v2_get_uvb(&uvl, &uvb) < 0) {
        fprintf(stderr, "Could not get UV-B, probably timeout\n");
        return 1;
    }

    printf("UV-B: %f mW/m²\n", uvb/10.0);

    // Get current UV index
    int32_t uvi;
    if(uv_light_v2_get_uvi(&uvl, &uvi) < 0) {
        fprintf(stderr, "Could not get UV index, probably timeout\n");
        return 1;
    }

    printf("UV Index: %f\n", uvi/10.0);

    printf("Press key to exit\n");
    getchar();
    uv_light_v2_destroy(&uvl);
    ipcon_destroy(&ipcon); // Calls ipcon_disconnect internally
    return 0;
}

API

Every function of the C/C++ bindings returns an integer which describes an error code. Data returned from the device, when a getter is called, is handled via call by reference. These parameters are labeled with the ret_ prefix.

Possible error codes are:

  • E_OK = 0
  • E_TIMEOUT = -1
  • E_NO_STREAM_SOCKET = -2
  • E_HOSTNAME_INVALID = -3
  • E_NO_CONNECT = -4
  • E_NO_THREAD = -5
  • E_NOT_ADDED = -6 (unused since bindings version 2.0.0)
  • E_ALREADY_CONNECTED = -7
  • E_NOT_CONNECTED = -8
  • E_INVALID_PARAMETER = -9
  • E_NOT_SUPPORTED = -10
  • E_UNKNOWN_ERROR_CODE = -11
  • E_STREAM_OUT_OF_SYNC = -12

as defined in ip_connection.h.

All functions listed below are thread-safe.

Basic Functions

void uv_light_v2_create(UVLightV2 *uv_light_v2, const char *uid, IPConnection *ipcon)

Creates the device object uv_light_v2 with the unique device ID uid and adds it to the IPConnection ipcon:

UVLightV2 uv_light_v2;
uv_light_v2_create(&uv_light_v2, "YOUR_DEVICE_UID", &ipcon);

This device object can be used after the IP connection has been connected (see examples above).

void uv_light_v2_destroy(UVLightV2 *uv_light_v2)

Removes the device object uv_light_v2 from its IPConnection and destroys it. The device object cannot be used anymore afterwards.

int uv_light_v2_get_uva(UVLightV2 *uv_light_v2, int32_t *ret_uva)

Returns the UVA intensity of the sensor, the intensity is given in 1/10 mW/m². The sensor has not weighted the intensity with the erythemal action spectrum to get the skin-affecting irradiation. Therefore, you cannot just divide the value by 250 to get the UVA index. To get the UV index use uv_light_v2_get_uvi().

If the sensor is saturated, then -1 is returned, see uv_light_v2_set_configuration().

If you want to get the intensity periodically, it is recommended to use the UV_LIGHT_V2_CALLBACK_UVA callback and set the period with uv_light_v2_set_uva_callback_configuration().

If you want to get the value periodically, it is recommended to use the UV_LIGHT_V2_CALLBACK_UVA callback. You can set the callback configuration with uv_light_v2_set_uva_callback_configuration().

int uv_light_v2_get_uvb(UVLightV2 *uv_light_v2, int32_t *ret_uvb)

Returns the UVB intensity of the sensor, the intensity is given in 1/10 mW/m². The sensor has not weighted the intensity with the erythemal action spectrum to get the skin-affecting irradiation. Therefore, you cannot just divide the value by 250 to get the UVB index. To get the UV index use uv_light_v2_get_uvi().

If the sensor is saturated, then -1 is returned, see uv_light_v2_set_configuration().

If you want to get the intensity periodically, it is recommended to use the UV_LIGHT_V2_CALLBACK_UVB callback and set the period with uv_light_v2_set_uvb_callback_configuration().

If you want to get the value periodically, it is recommended to use the UV_LIGHT_V2_CALLBACK_UVB callback. You can set the callback configuration with uv_light_v2_set_uvb_callback_configuration().

int uv_light_v2_get_uvi(UVLightV2 *uv_light_v2, int32_t *ret_uvi)

Returns the UV index of the sensor, the index is given in 1/10.

If the sensor is saturated, then -1 is returned, see uv_light_v2_set_configuration().

If you want to get the intensity periodically, it is recommended to use the UV_LIGHT_V2_CALLBACK_UVI callback and set the period with uv_light_v2_set_uvi_callback_configuration().

If you want to get the value periodically, it is recommended to use the UV_LIGHT_V2_CALLBACK_UVI callback. You can set the callback configuration with uv_light_v2_set_uvi_callback_configuration().

Advanced Functions

int uv_light_v2_set_configuration(UVLightV2 *uv_light_v2, uint8_t integration_time)

Sets the configuration of the sensor. The integration time can be configured between 50 and 800 ms. With a shorter integration time the sensor reading updates more often but contains more noise. With a longer integration the sensor reading contains less noise but updates less often.

With a longer integration time (especially 800 ms) and a higher UV intensity the sensor can be saturated. If this happens the UVA/UVB/UVI readings are all -1. In this case you need to choose a shorter integration time.

Default value: 400 ms.

The following defines are available for this function:

  • UV_LIGHT_V2_INTEGRATION_TIME_50MS = 0
  • UV_LIGHT_V2_INTEGRATION_TIME_100MS = 1
  • UV_LIGHT_V2_INTEGRATION_TIME_200MS = 2
  • UV_LIGHT_V2_INTEGRATION_TIME_400MS = 3
  • UV_LIGHT_V2_INTEGRATION_TIME_800MS = 4
int uv_light_v2_get_configuration(UVLightV2 *uv_light_v2, uint8_t *ret_integration_time)

Returns the configuration as set by uv_light_v2_set_configuration().

The following defines are available for this function:

  • UV_LIGHT_V2_INTEGRATION_TIME_50MS = 0
  • UV_LIGHT_V2_INTEGRATION_TIME_100MS = 1
  • UV_LIGHT_V2_INTEGRATION_TIME_200MS = 2
  • UV_LIGHT_V2_INTEGRATION_TIME_400MS = 3
  • UV_LIGHT_V2_INTEGRATION_TIME_800MS = 4
int uv_light_v2_get_api_version(UVLightV2 *uv_light_v2, uint8_t ret_api_version[3])

Returns the version of the API definition (major, minor, revision) implemented by this API bindings. This is neither the release version of this API bindings nor does it tell you anything about the represented Brick or Bricklet.

int uv_light_v2_get_response_expected(UVLightV2 *uv_light_v2, uint8_t function_id, bool *ret_response_expected)

Returns the response expected flag for the function specified by the function ID parameter. It is true if the function is expected to send a response, false otherwise.

For getter functions this is enabled by default and cannot be disabled, because those functions will always send a response. For callback configuration functions it is enabled by default too, but can be disabled by uv_light_v2_set_response_expected(). For setter functions it is disabled by default and can be enabled.

Enabling the response expected flag for a setter function allows to detect timeouts and other error conditions calls of this setter as well. The device will then send a response for this purpose. If this flag is disabled for a setter function then no response is send and errors are silently ignored, because they cannot be detected.

See uv_light_v2_set_response_expected() for the list of function ID defines available for this function.

int uv_light_v2_set_response_expected(UVLightV2 *uv_light_v2, uint8_t function_id, bool response_expected)

Changes the response expected flag of the function specified by the function ID parameter. This flag can only be changed for setter (default value: false) and callback configuration functions (default value: true). For getter functions it is always enabled.

Enabling the response expected flag for a setter function allows to detect timeouts and other error conditions calls of this setter as well. The device will then send a response for this purpose. If this flag is disabled for a setter function then no response is send and errors are silently ignored, because they cannot be detected.

The following function ID defines are available for this function:

  • UV_LIGHT_V2_FUNCTION_SET_UVA_CALLBACK_CONFIGURATION = 2
  • UV_LIGHT_V2_FUNCTION_SET_UVB_CALLBACK_CONFIGURATION = 6
  • UV_LIGHT_V2_FUNCTION_SET_UVI_CALLBACK_CONFIGURATION = 10
  • UV_LIGHT_V2_FUNCTION_SET_CONFIGURATION = 13
  • UV_LIGHT_V2_FUNCTION_SET_WRITE_FIRMWARE_POINTER = 237
  • UV_LIGHT_V2_FUNCTION_SET_STATUS_LED_CONFIG = 239
  • UV_LIGHT_V2_FUNCTION_RESET = 243
  • UV_LIGHT_V2_FUNCTION_WRITE_UID = 248
int uv_light_v2_set_response_expected_all(UVLightV2 *uv_light_v2, bool response_expected)

Changes the response expected flag for all setter and callback configuration functions of this device at once.

int uv_light_v2_get_spitfp_error_count(UVLightV2 *uv_light_v2, uint32_t *ret_error_count_ack_checksum, uint32_t *ret_error_count_message_checksum, uint32_t *ret_error_count_frame, uint32_t *ret_error_count_overflow)

Returns the error count for the communication between Brick and Bricklet.

The errors are divided into

  • ACK checksum errors,
  • message checksum errors,
  • framing errors and
  • overflow errors.

The errors counts are for errors that occur on the Bricklet side. All Bricks have a similar function that returns the errors on the Brick side.

int uv_light_v2_set_bootloader_mode(UVLightV2 *uv_light_v2, uint8_t mode, uint8_t *ret_status)

Sets the bootloader mode and returns the status after the requested mode change was instigated.

You can change from bootloader mode to firmware mode and vice versa. A change from bootloader mode to firmware mode will only take place if the entry function, device identifier and CRC are present and correct.

This function is used by Brick Viewer during flashing. It should not be necessary to call it in a normal user program.

The following defines are available for this function:

  • UV_LIGHT_V2_BOOTLOADER_MODE_BOOTLOADER = 0
  • UV_LIGHT_V2_BOOTLOADER_MODE_FIRMWARE = 1
  • UV_LIGHT_V2_BOOTLOADER_MODE_BOOTLOADER_WAIT_FOR_REBOOT = 2
  • UV_LIGHT_V2_BOOTLOADER_MODE_FIRMWARE_WAIT_FOR_REBOOT = 3
  • UV_LIGHT_V2_BOOTLOADER_MODE_FIRMWARE_WAIT_FOR_ERASE_AND_REBOOT = 4
  • UV_LIGHT_V2_BOOTLOADER_STATUS_OK = 0
  • UV_LIGHT_V2_BOOTLOADER_STATUS_INVALID_MODE = 1
  • UV_LIGHT_V2_BOOTLOADER_STATUS_NO_CHANGE = 2
  • UV_LIGHT_V2_BOOTLOADER_STATUS_ENTRY_FUNCTION_NOT_PRESENT = 3
  • UV_LIGHT_V2_BOOTLOADER_STATUS_DEVICE_IDENTIFIER_INCORRECT = 4
  • UV_LIGHT_V2_BOOTLOADER_STATUS_CRC_MISMATCH = 5
int uv_light_v2_get_bootloader_mode(UVLightV2 *uv_light_v2, uint8_t *ret_mode)

Returns the current bootloader mode, see uv_light_v2_set_bootloader_mode().

The following defines are available for this function:

  • UV_LIGHT_V2_BOOTLOADER_MODE_BOOTLOADER = 0
  • UV_LIGHT_V2_BOOTLOADER_MODE_FIRMWARE = 1
  • UV_LIGHT_V2_BOOTLOADER_MODE_BOOTLOADER_WAIT_FOR_REBOOT = 2
  • UV_LIGHT_V2_BOOTLOADER_MODE_FIRMWARE_WAIT_FOR_REBOOT = 3
  • UV_LIGHT_V2_BOOTLOADER_MODE_FIRMWARE_WAIT_FOR_ERASE_AND_REBOOT = 4
int uv_light_v2_set_write_firmware_pointer(UVLightV2 *uv_light_v2, uint32_t pointer)

Sets the firmware pointer for uv_light_v2_write_firmware(). The pointer has to be increased by chunks of size 64. The data is written to flash every 4 chunks (which equals to one page of size 256).

This function is used by Brick Viewer during flashing. It should not be necessary to call it in a normal user program.

int uv_light_v2_write_firmware(UVLightV2 *uv_light_v2, uint8_t data[64], uint8_t *ret_status)

Writes 64 Bytes of firmware at the position as written by uv_light_v2_set_write_firmware_pointer() before. The firmware is written to flash every 4 chunks.

You can only write firmware in bootloader mode.

This function is used by Brick Viewer during flashing. It should not be necessary to call it in a normal user program.

int uv_light_v2_set_status_led_config(UVLightV2 *uv_light_v2, uint8_t config)

Sets the status LED configuration. By default the LED shows communication traffic between Brick and Bricklet, it flickers once for every 10 received data packets.

You can also turn the LED permanently on/off or show a heartbeat.

If the Bricklet is in bootloader mode, the LED is will show heartbeat by default.

The following defines are available for this function:

  • UV_LIGHT_V2_STATUS_LED_CONFIG_OFF = 0
  • UV_LIGHT_V2_STATUS_LED_CONFIG_ON = 1
  • UV_LIGHT_V2_STATUS_LED_CONFIG_SHOW_HEARTBEAT = 2
  • UV_LIGHT_V2_STATUS_LED_CONFIG_SHOW_STATUS = 3
int uv_light_v2_get_status_led_config(UVLightV2 *uv_light_v2, uint8_t *ret_config)

Returns the configuration as set by uv_light_v2_set_status_led_config()

The following defines are available for this function:

  • UV_LIGHT_V2_STATUS_LED_CONFIG_OFF = 0
  • UV_LIGHT_V2_STATUS_LED_CONFIG_ON = 1
  • UV_LIGHT_V2_STATUS_LED_CONFIG_SHOW_HEARTBEAT = 2
  • UV_LIGHT_V2_STATUS_LED_CONFIG_SHOW_STATUS = 3
int uv_light_v2_get_chip_temperature(UVLightV2 *uv_light_v2, int16_t *ret_temperature)

Returns the temperature in °C as measured inside the microcontroller. The value returned is not the ambient temperature!

The temperature is only proportional to the real temperature and it has bad accuracy. Practically it is only useful as an indicator for temperature changes.

int uv_light_v2_reset(UVLightV2 *uv_light_v2)

Calling this function will reset the Bricklet. All configurations will be lost.

After a reset you have to create new device objects, calling functions on the existing ones will result in undefined behavior!

int uv_light_v2_write_uid(UVLightV2 *uv_light_v2, uint32_t uid)

Writes a new UID into flash. If you want to set a new UID you have to decode the Base58 encoded UID string into an integer first.

We recommend that you use Brick Viewer to change the UID.

int uv_light_v2_read_uid(UVLightV2 *uv_light_v2, uint32_t *ret_uid)

Returns the current UID as an integer. Encode as Base58 to get the usual string version.

int uv_light_v2_get_identity(UVLightV2 *uv_light_v2, char ret_uid[8], char ret_connected_uid[8], char *ret_position, uint8_t ret_hardware_version[3], uint8_t ret_firmware_version[3], uint16_t *ret_device_identifier)

Returns the UID, the UID where the Bricklet is connected to, the position, the hardware and firmware version as well as the device identifier.

The position can be 'a', 'b', 'c' or 'd'.

The device identifier numbers can be found here. There is also a constant for the device identifier of this Bricklet.

Callback Configuration Functions

void uv_light_v2_register_callback(UVLightV2 *uv_light_v2, int16_t callback_id, void *function, void *user_data)

Registers the given function with the given callback_id. The user_data will be passed as the last parameter to the function.

The available callback IDs with corresponding function signatures are listed below.

int uv_light_v2_set_uva_callback_configuration(UVLightV2 *uv_light_v2, uint32_t period, bool value_has_to_change, char option, int32_t min, int32_t max)

The period in ms is the period with which the UV_LIGHT_V2_CALLBACK_UVA callback is triggered periodically. A value of 0 turns the callback off.

If the value has to change-parameter is set to true, the callback is only triggered after the value has changed. If the value didn't change within the period, the callback is triggered immediately on change.

If it is set to false, the callback is continuously triggered with the period, independent of the value.

It is furthermore possible to constrain the callback with thresholds.

The option-parameter together with min/max sets a threshold for the UV_LIGHT_V2_CALLBACK_UVA callback.

The following options are possible:

Option Description
'x' Threshold is turned off
'o' Threshold is triggered when the value is outside the min and max values
'i' Threshold is triggered when the value is inside or equal to the min and max values
'<' Threshold is triggered when the value is smaller than the min value (max is ignored)
'>' Threshold is triggered when the value is greater than the min value (max is ignored)

If the option is set to 'x' (threshold turned off) the callback is triggered with the fixed period.

The default value is (0, false, 'x', 0, 0).

The following defines are available for this function:

  • UV_LIGHT_V2_THRESHOLD_OPTION_OFF = 'x'
  • UV_LIGHT_V2_THRESHOLD_OPTION_OUTSIDE = 'o'
  • UV_LIGHT_V2_THRESHOLD_OPTION_INSIDE = 'i'
  • UV_LIGHT_V2_THRESHOLD_OPTION_SMALLER = '<'
  • UV_LIGHT_V2_THRESHOLD_OPTION_GREATER = '>'
int uv_light_v2_get_uva_callback_configuration(UVLightV2 *uv_light_v2, uint32_t *ret_period, bool *ret_value_has_to_change, char *ret_option, int32_t *ret_min, int32_t *ret_max)

Returns the callback configuration as set by uv_light_v2_set_uva_callback_configuration().

The following defines are available for this function:

  • UV_LIGHT_V2_THRESHOLD_OPTION_OFF = 'x'
  • UV_LIGHT_V2_THRESHOLD_OPTION_OUTSIDE = 'o'
  • UV_LIGHT_V2_THRESHOLD_OPTION_INSIDE = 'i'
  • UV_LIGHT_V2_THRESHOLD_OPTION_SMALLER = '<'
  • UV_LIGHT_V2_THRESHOLD_OPTION_GREATER = '>'
int uv_light_v2_set_uvb_callback_configuration(UVLightV2 *uv_light_v2, uint32_t period, bool value_has_to_change, char option, int32_t min, int32_t max)

The period in ms is the period with which the UV_LIGHT_V2_CALLBACK_UVB callback is triggered periodically. A value of 0 turns the callback off.

If the value has to change-parameter is set to true, the callback is only triggered after the value has changed. If the value didn't change within the period, the callback is triggered immediately on change.

If it is set to false, the callback is continuously triggered with the period, independent of the value.

It is furthermore possible to constrain the callback with thresholds.

The option-parameter together with min/max sets a threshold for the UV_LIGHT_V2_CALLBACK_UVB callback.

The following options are possible:

Option Description
'x' Threshold is turned off
'o' Threshold is triggered when the value is outside the min and max values
'i' Threshold is triggered when the value is inside or equal to the min and max values
'<' Threshold is triggered when the value is smaller than the min value (max is ignored)
'>' Threshold is triggered when the value is greater than the min value (max is ignored)

If the option is set to 'x' (threshold turned off) the callback is triggered with the fixed period.

The default value is (0, false, 'x', 0, 0).

The following defines are available for this function:

  • UV_LIGHT_V2_THRESHOLD_OPTION_OFF = 'x'
  • UV_LIGHT_V2_THRESHOLD_OPTION_OUTSIDE = 'o'
  • UV_LIGHT_V2_THRESHOLD_OPTION_INSIDE = 'i'
  • UV_LIGHT_V2_THRESHOLD_OPTION_SMALLER = '<'
  • UV_LIGHT_V2_THRESHOLD_OPTION_GREATER = '>'
int uv_light_v2_get_uvb_callback_configuration(UVLightV2 *uv_light_v2, uint32_t *ret_period, bool *ret_value_has_to_change, char *ret_option, int32_t *ret_min, int32_t *ret_max)

Returns the callback configuration as set by uv_light_v2_set_uvb_callback_configuration().

The following defines are available for this function:

  • UV_LIGHT_V2_THRESHOLD_OPTION_OFF = 'x'
  • UV_LIGHT_V2_THRESHOLD_OPTION_OUTSIDE = 'o'
  • UV_LIGHT_V2_THRESHOLD_OPTION_INSIDE = 'i'
  • UV_LIGHT_V2_THRESHOLD_OPTION_SMALLER = '<'
  • UV_LIGHT_V2_THRESHOLD_OPTION_GREATER = '>'
int uv_light_v2_set_uvi_callback_configuration(UVLightV2 *uv_light_v2, uint32_t period, bool value_has_to_change, char option, int32_t min, int32_t max)

The period in ms is the period with which the UV_LIGHT_V2_CALLBACK_UVI callback is triggered periodically. A value of 0 turns the callback off.

If the value has to change-parameter is set to true, the callback is only triggered after the value has changed. If the value didn't change within the period, the callback is triggered immediately on change.

If it is set to false, the callback is continuously triggered with the period, independent of the value.

It is furthermore possible to constrain the callback with thresholds.

The option-parameter together with min/max sets a threshold for the UV_LIGHT_V2_CALLBACK_UVI callback.

The following options are possible:

Option Description
'x' Threshold is turned off
'o' Threshold is triggered when the value is outside the min and max values
'i' Threshold is triggered when the value is inside or equal to the min and max values
'<' Threshold is triggered when the value is smaller than the min value (max is ignored)
'>' Threshold is triggered when the value is greater than the min value (max is ignored)

If the option is set to 'x' (threshold turned off) the callback is triggered with the fixed period.

The default value is (0, false, 'x', 0, 0).

The following defines are available for this function:

  • UV_LIGHT_V2_THRESHOLD_OPTION_OFF = 'x'
  • UV_LIGHT_V2_THRESHOLD_OPTION_OUTSIDE = 'o'
  • UV_LIGHT_V2_THRESHOLD_OPTION_INSIDE = 'i'
  • UV_LIGHT_V2_THRESHOLD_OPTION_SMALLER = '<'
  • UV_LIGHT_V2_THRESHOLD_OPTION_GREATER = '>'
int uv_light_v2_get_uvi_callback_configuration(UVLightV2 *uv_light_v2, uint32_t *ret_period, bool *ret_value_has_to_change, char *ret_option, int32_t *ret_min, int32_t *ret_max)

Returns the callback configuration as set by uv_light_v2_set_uvi_callback_configuration().

The following defines are available for this function:

  • UV_LIGHT_V2_THRESHOLD_OPTION_OFF = 'x'
  • UV_LIGHT_V2_THRESHOLD_OPTION_OUTSIDE = 'o'
  • UV_LIGHT_V2_THRESHOLD_OPTION_INSIDE = 'i'
  • UV_LIGHT_V2_THRESHOLD_OPTION_SMALLER = '<'
  • UV_LIGHT_V2_THRESHOLD_OPTION_GREATER = '>'

Callbacks

Callbacks can be registered to receive time critical or recurring data from the device. The registration is done with the uv_light_v2_register_callback() function. The parameters consist of the device object, the callback ID, the callback function and optional user data:

void my_callback(int p, void *user_data) {
    printf("parameter: %d\n", p);
}

uv_light_v2_register_callback(&uv_light_v2, UV_LIGHT_V2_CALLBACK_EXAMPLE, (void *)my_callback, NULL);

The available constants with corresponding callback function signatures are described below.

Note

Using callbacks for recurring events is always preferred compared to using getters. It will use less USB bandwidth and the latency will be a lot better, since there is no round trip time.

UV_LIGHT_V2_CALLBACK_UVA
void callback(int32_t uva, void *user_data)

This callback is triggered periodically according to the configuration set by uv_light_v2_set_uva_callback_configuration().

The parameter is the same as uv_light_v2_get_uva().

UV_LIGHT_V2_CALLBACK_UVB
void callback(int32_t uvb, void *user_data)

This callback is triggered periodically according to the configuration set by uv_light_v2_set_uvb_callback_configuration().

The parameter is the same as uv_light_v2_get_uvb().

UV_LIGHT_V2_CALLBACK_UVI
void callback(int32_t uvi, void *user_data)

This callback is triggered periodically according to the configuration set by uv_light_v2_set_uvi_callback_configuration().

The parameter is the same as uv_light_v2_get_uvi().

Constants

UV_LIGHT_V2_DEVICE_IDENTIFIER

This constant is used to identify a UV Light Bricklet 2.0.

The uv_light_v2_get_identity() function and the IPCON_CALLBACK_ENUMERATE callback of the IP Connection have a device_identifier parameter to specify the Brick's or Bricklet's type.

UV_LIGHT_V2_DEVICE_DISPLAY_NAME

This constant represents the human readable name of a UV Light Bricklet 2.0.