C/C++ - Temperature IR Bricklet 2.0

This is the description of the C/C++ API bindings for the Temperature IR Bricklet 2.0. General information and technical specifications for the Temperature IR 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_temperature_ir_v2.h"

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

// Callback function for object temperature callback
void cb_object_temperature(int16_t temperature, void *user_data) {
    (void)user_data; // avoid unused parameter warning

    printf("Object Temperature: %f °C\n", temperature/10.0);
}

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

    // Create device object
    TemperatureIRV2 tir;
    temperature_ir_v2_create(&tir, 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 object temperature callback to function cb_object_temperature
    temperature_ir_v2_register_callback(&tir,
                                        TEMPERATURE_IR_V2_CALLBACK_OBJECT_TEMPERATURE,
                                        (void *)cb_object_temperature,
                                        NULL);

    // Set period for object temperature callback to 1s (1000ms) without a threshold
    temperature_ir_v2_set_object_temperature_callback_configuration(&tir, 1000, false, 'x', 0, 0);

    printf("Press key to exit\n");
    getchar();
    temperature_ir_v2_destroy(&tir);
    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_temperature_ir_v2.h"

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

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

    // Create device object
    TemperatureIRV2 tir;
    temperature_ir_v2_create(&tir, 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 ambient temperature
    int16_t ambient_temperature;
    if(temperature_ir_v2_get_ambient_temperature(&tir, &ambient_temperature) < 0) {
        fprintf(stderr, "Could not get ambient temperature, probably timeout\n");
        return 1;
    }

    printf("Ambient Temperature: %f °C\n", ambient_temperature/10.0);

    // Get current object temperature
    int16_t object_temperature;
    if(temperature_ir_v2_get_object_temperature(&tir, &object_temperature) < 0) {
        fprintf(stderr, "Could not get object temperature, probably timeout\n");
        return 1;
    }

    printf("Object Temperature: %f °C\n", object_temperature/10.0);

    printf("Press key to exit\n");
    getchar();
    temperature_ir_v2_destroy(&tir);
    ipcon_destroy(&ipcon); // Calls ipcon_disconnect internally
    return 0;
}

Water Boiling

Download (example_water_boiling.c)

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#include <stdio.h>

#include "ip_connection.h"
#include "bricklet_temperature_ir_v2.h"

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

// Callback function for object temperature reached callback
void cb_object_temperature(int16_t temperature, void *user_data) {
    (void)user_data; // avoid unused parameter warning

    printf("Object Temperature: %f °C\n", temperature/10.0);
    printf("The water is boiling!\n");
}

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

    // Create device object
    TemperatureIRV2 tir;
    temperature_ir_v2_create(&tir, 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

    // Set emissivity to 0.98 (emissivity of water, 65535 * 0.98 = 64224.299)
    temperature_ir_v2_set_emissivity(&tir, 64224);

    // Register object temperature reached callback to function cb_object_temperature
    temperature_ir_v2_register_callback(&tir,
                                        TEMPERATURE_IR_V2_CALLBACK_OBJECT_TEMPERATURE,
                                        (void *)cb_object_temperature,
                                        NULL);

    // Configure threshold for object temperature "greater than 100 °C"
    // with a debounce period of 10s (10000ms)
    temperature_ir_v2_set_object_temperature_callback_configuration(&tir, 10000, false, '>', 100*10, 0);

    printf("Press key to exit\n");
    getchar();
    temperature_ir_v2_destroy(&tir);
    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 temperature_ir_v2_create(TemperatureIRV2 *temperature_ir_v2, const char *uid, IPConnection *ipcon)

Creates the device object temperature_ir_v2 with the unique device ID uid and adds it to the IPConnection ipcon:

TemperatureIRV2 temperature_ir_v2;
temperature_ir_v2_create(&temperature_ir_v2, "YOUR_DEVICE_UID", &ipcon);

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

void temperature_ir_v2_destroy(TemperatureIRV2 *temperature_ir_v2)

Removes the device object temperature_ir_v2 from its IPConnection and destroys it. The device object cannot be used anymore afterwards.

int temperature_ir_v2_get_ambient_temperature(TemperatureIRV2 *temperature_ir_v2, int16_t *ret_temperature)

Returns the ambient temperature of the sensor. The value has a range of -400 to 1250 and is given in °C/10, e.g. a value of 423 means that an ambient temperature of 42.3 °C is measured.

If you want to get the ambient temperature periodically, it is recommended to use the TEMPERATURE_IR_V2_CALLBACK_AMBIENT_TEMPERATURE callback and set the period with temperature_ir_v2_set_ambient_temperature_callback_configuration().

If you want to get the value periodically, it is recommended to use the TEMPERATURE_IR_V2_CALLBACK_AMBIENT_TEMPERATURE callback. You can set the callback configuration with temperature_ir_v2_set_ambient_temperature_callback_configuration().

int temperature_ir_v2_get_object_temperature(TemperatureIRV2 *temperature_ir_v2, int16_t *ret_temperature)

Returns the object temperature of the sensor, i.e. the temperature of the surface of the object the sensor is aimed at. The value has a range of -700 to 3800 and is given in °C/10, e.g. a value of 3001 means that a temperature of 300.1 °C is measured on the surface of the object.

The temperature of different materials is dependent on their emissivity. The emissivity of the material can be set with temperature_ir_v2_set_emissivity().

If you want to get the object temperature periodically, it is recommended to use the TEMPERATURE_IR_V2_CALLBACK_OBJECT_TEMPERATURE callback and set the period with temperature_ir_v2_set_object_temperature_callback_configuration().

If you want to get the value periodically, it is recommended to use the TEMPERATURE_IR_V2_CALLBACK_OBJECT_TEMPERATURE callback. You can set the callback configuration with temperature_ir_v2_set_object_temperature_callback_configuration().

Advanced Functions

int temperature_ir_v2_set_emissivity(TemperatureIRV2 *temperature_ir_v2, uint16_t emissivity)

Sets the emissivity that is used to calculate the surface temperature as returned by temperature_ir_v2_get_object_temperature().

The emissivity is usually given as a value between 0.0 and 1.0. A list of emissivities of different materials can be found here.

The parameter of temperature_ir_v2_set_emissivity() has to be given with a factor of 65535 (16-bit). For example: An emissivity of 0.1 can be set with the value 6553, an emissivity of 0.5 with the value 32767 and so on.

Note

If you need a precise measurement for the object temperature, it is absolutely crucial that you also provide a precise emissivity.

The default emissivity is 1.0 (value of 65535) and the minimum emissivity the sensor can handle is 0.1 (value of 6553).

int temperature_ir_v2_get_emissivity(TemperatureIRV2 *temperature_ir_v2, uint16_t *ret_emissivity)

Returns the emissivity as set by temperature_ir_v2_set_emissivity().

int temperature_ir_v2_get_api_version(TemperatureIRV2 *temperature_ir_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 temperature_ir_v2_get_response_expected(TemperatureIRV2 *temperature_ir_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 temperature_ir_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 temperature_ir_v2_set_response_expected() for the list of function ID defines available for this function.

int temperature_ir_v2_set_response_expected(TemperatureIRV2 *temperature_ir_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:

  • TEMPERATURE_IR_V2_FUNCTION_SET_AMBIENT_TEMPERATURE_CALLBACK_CONFIGURATION = 2
  • TEMPERATURE_IR_V2_FUNCTION_SET_OBJECT_TEMPERATURE_CALLBACK_CONFIGURATION = 6
  • TEMPERATURE_IR_V2_FUNCTION_SET_EMISSIVITY = 9
  • TEMPERATURE_IR_V2_FUNCTION_SET_WRITE_FIRMWARE_POINTER = 237
  • TEMPERATURE_IR_V2_FUNCTION_SET_STATUS_LED_CONFIG = 239
  • TEMPERATURE_IR_V2_FUNCTION_RESET = 243
  • TEMPERATURE_IR_V2_FUNCTION_WRITE_UID = 248
int temperature_ir_v2_set_response_expected_all(TemperatureIRV2 *temperature_ir_v2, bool response_expected)

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

int temperature_ir_v2_get_spitfp_error_count(TemperatureIRV2 *temperature_ir_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 temperature_ir_v2_set_bootloader_mode(TemperatureIRV2 *temperature_ir_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:

  • TEMPERATURE_IR_V2_BOOTLOADER_MODE_BOOTLOADER = 0
  • TEMPERATURE_IR_V2_BOOTLOADER_MODE_FIRMWARE = 1
  • TEMPERATURE_IR_V2_BOOTLOADER_MODE_BOOTLOADER_WAIT_FOR_REBOOT = 2
  • TEMPERATURE_IR_V2_BOOTLOADER_MODE_FIRMWARE_WAIT_FOR_REBOOT = 3
  • TEMPERATURE_IR_V2_BOOTLOADER_MODE_FIRMWARE_WAIT_FOR_ERASE_AND_REBOOT = 4
  • TEMPERATURE_IR_V2_BOOTLOADER_STATUS_OK = 0
  • TEMPERATURE_IR_V2_BOOTLOADER_STATUS_INVALID_MODE = 1
  • TEMPERATURE_IR_V2_BOOTLOADER_STATUS_NO_CHANGE = 2
  • TEMPERATURE_IR_V2_BOOTLOADER_STATUS_ENTRY_FUNCTION_NOT_PRESENT = 3
  • TEMPERATURE_IR_V2_BOOTLOADER_STATUS_DEVICE_IDENTIFIER_INCORRECT = 4
  • TEMPERATURE_IR_V2_BOOTLOADER_STATUS_CRC_MISMATCH = 5
int temperature_ir_v2_get_bootloader_mode(TemperatureIRV2 *temperature_ir_v2, uint8_t *ret_mode)

Returns the current bootloader mode, see temperature_ir_v2_set_bootloader_mode().

The following defines are available for this function:

  • TEMPERATURE_IR_V2_BOOTLOADER_MODE_BOOTLOADER = 0
  • TEMPERATURE_IR_V2_BOOTLOADER_MODE_FIRMWARE = 1
  • TEMPERATURE_IR_V2_BOOTLOADER_MODE_BOOTLOADER_WAIT_FOR_REBOOT = 2
  • TEMPERATURE_IR_V2_BOOTLOADER_MODE_FIRMWARE_WAIT_FOR_REBOOT = 3
  • TEMPERATURE_IR_V2_BOOTLOADER_MODE_FIRMWARE_WAIT_FOR_ERASE_AND_REBOOT = 4
int temperature_ir_v2_set_write_firmware_pointer(TemperatureIRV2 *temperature_ir_v2, uint32_t pointer)

Sets the firmware pointer for temperature_ir_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 temperature_ir_v2_write_firmware(TemperatureIRV2 *temperature_ir_v2, uint8_t data[64], uint8_t *ret_status)

Writes 64 Bytes of firmware at the position as written by temperature_ir_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 temperature_ir_v2_set_status_led_config(TemperatureIRV2 *temperature_ir_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:

  • TEMPERATURE_IR_V2_STATUS_LED_CONFIG_OFF = 0
  • TEMPERATURE_IR_V2_STATUS_LED_CONFIG_ON = 1
  • TEMPERATURE_IR_V2_STATUS_LED_CONFIG_SHOW_HEARTBEAT = 2
  • TEMPERATURE_IR_V2_STATUS_LED_CONFIG_SHOW_STATUS = 3
int temperature_ir_v2_get_status_led_config(TemperatureIRV2 *temperature_ir_v2, uint8_t *ret_config)

Returns the configuration as set by temperature_ir_v2_set_status_led_config()

The following defines are available for this function:

  • TEMPERATURE_IR_V2_STATUS_LED_CONFIG_OFF = 0
  • TEMPERATURE_IR_V2_STATUS_LED_CONFIG_ON = 1
  • TEMPERATURE_IR_V2_STATUS_LED_CONFIG_SHOW_HEARTBEAT = 2
  • TEMPERATURE_IR_V2_STATUS_LED_CONFIG_SHOW_STATUS = 3
int temperature_ir_v2_get_chip_temperature(TemperatureIRV2 *temperature_ir_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 temperature_ir_v2_reset(TemperatureIRV2 *temperature_ir_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 temperature_ir_v2_write_uid(TemperatureIRV2 *temperature_ir_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 temperature_ir_v2_read_uid(TemperatureIRV2 *temperature_ir_v2, uint32_t *ret_uid)

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

int temperature_ir_v2_get_identity(TemperatureIRV2 *temperature_ir_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 temperature_ir_v2_register_callback(TemperatureIRV2 *temperature_ir_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 temperature_ir_v2_set_ambient_temperature_callback_configuration(TemperatureIRV2 *temperature_ir_v2, uint32_t period, bool value_has_to_change, char option, int16_t min, int16_t max)

The period in ms is the period with which the TEMPERATURE_IR_V2_CALLBACK_AMBIENT_TEMPERATURE 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 TEMPERATURE_IR_V2_CALLBACK_AMBIENT_TEMPERATURE 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:

  • TEMPERATURE_IR_V2_THRESHOLD_OPTION_OFF = 'x'
  • TEMPERATURE_IR_V2_THRESHOLD_OPTION_OUTSIDE = 'o'
  • TEMPERATURE_IR_V2_THRESHOLD_OPTION_INSIDE = 'i'
  • TEMPERATURE_IR_V2_THRESHOLD_OPTION_SMALLER = '<'
  • TEMPERATURE_IR_V2_THRESHOLD_OPTION_GREATER = '>'
int temperature_ir_v2_get_ambient_temperature_callback_configuration(TemperatureIRV2 *temperature_ir_v2, uint32_t *ret_period, bool *ret_value_has_to_change, char *ret_option, int16_t *ret_min, int16_t *ret_max)

Returns the callback configuration as set by temperature_ir_v2_set_ambient_temperature_callback_configuration().

The following defines are available for this function:

  • TEMPERATURE_IR_V2_THRESHOLD_OPTION_OFF = 'x'
  • TEMPERATURE_IR_V2_THRESHOLD_OPTION_OUTSIDE = 'o'
  • TEMPERATURE_IR_V2_THRESHOLD_OPTION_INSIDE = 'i'
  • TEMPERATURE_IR_V2_THRESHOLD_OPTION_SMALLER = '<'
  • TEMPERATURE_IR_V2_THRESHOLD_OPTION_GREATER = '>'
int temperature_ir_v2_set_object_temperature_callback_configuration(TemperatureIRV2 *temperature_ir_v2, uint32_t period, bool value_has_to_change, char option, int16_t min, int16_t max)

The period in ms is the period with which the TEMPERATURE_IR_V2_CALLBACK_OBJECT_TEMPERATURE 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 TEMPERATURE_IR_V2_CALLBACK_OBJECT_TEMPERATURE 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:

  • TEMPERATURE_IR_V2_THRESHOLD_OPTION_OFF = 'x'
  • TEMPERATURE_IR_V2_THRESHOLD_OPTION_OUTSIDE = 'o'
  • TEMPERATURE_IR_V2_THRESHOLD_OPTION_INSIDE = 'i'
  • TEMPERATURE_IR_V2_THRESHOLD_OPTION_SMALLER = '<'
  • TEMPERATURE_IR_V2_THRESHOLD_OPTION_GREATER = '>'
int temperature_ir_v2_get_object_temperature_callback_configuration(TemperatureIRV2 *temperature_ir_v2, uint32_t *ret_period, bool *ret_value_has_to_change, char *ret_option, int16_t *ret_min, int16_t *ret_max)

Returns the callback configuration as set by temperature_ir_v2_set_object_temperature_callback_configuration().

The following defines are available for this function:

  • TEMPERATURE_IR_V2_THRESHOLD_OPTION_OFF = 'x'
  • TEMPERATURE_IR_V2_THRESHOLD_OPTION_OUTSIDE = 'o'
  • TEMPERATURE_IR_V2_THRESHOLD_OPTION_INSIDE = 'i'
  • TEMPERATURE_IR_V2_THRESHOLD_OPTION_SMALLER = '<'
  • TEMPERATURE_IR_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 temperature_ir_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);
}

temperature_ir_v2_register_callback(&temperature_ir_v2, TEMPERATURE_IR_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.

TEMPERATURE_IR_V2_CALLBACK_AMBIENT_TEMPERATURE
void callback(int16_t temperature, void *user_data)

This callback is triggered periodically according to the configuration set by temperature_ir_v2_set_ambient_temperature_callback_configuration().

The parameter is the same as temperature_ir_v2_get_ambient_temperature().

TEMPERATURE_IR_V2_CALLBACK_OBJECT_TEMPERATURE
void callback(int16_t temperature, void *user_data)

This callback is triggered periodically according to the configuration set by temperature_ir_v2_set_object_temperature_callback_configuration().

The parameter is the same as temperature_ir_v2_get_object_temperature().

Constants

TEMPERATURE_IR_V2_DEVICE_IDENTIFIER

This constant is used to identify a Temperature IR Bricklet 2.0.

The temperature_ir_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.

TEMPERATURE_IR_V2_DEVICE_DISPLAY_NAME

This constant represents the human readable name of a Temperature IR Bricklet 2.0.