Determine functionality of the bus/adapter asynchronously. Returns a Promise that on success will be resolved with a frozen I2cFuncs object describing the functionality available. The returned Promise will be rejected if an error occurs. See also I2C functionality.

The way in which I2C is configured varies from board to board. Sometimes no configuraton is required, but sometimes it is:

Asynchronous SMBus read byte. The callback gets two arguments (err, byte). byte is an unsigned integer in the range 0 to 255.

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LCD colour displays are flat panel displays that you find on your computer or mobile phone that use liquid crystals to switch pixels on and off to produce a specific colour. A popular type of LCD display is the TFT LCD display module or TFT panel that uses TFT (Thin-Film Transistor) technology. A TFT display comprises of large sheets of independently controlled transistors that offer full RGB with the ability to display a wide range of colours and hues. These LCD TFT displays produce images that are much brighter and sharper than standard LCD displays as well as being able to refresh more quickly.

All methods in class Bus have asynchronous callback and synchronous forms. For promise support see class PromisifiedBus.

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Synchronous I2C block write (not defined by the SMBus specification). Writes a block of bytes to a device, to a designated register that is specified by cmd.

Asynchronous plain I2C read. The callback gets three argument (err, bytesRead, buffer). bytesRead is the number of bytes read.

Synchronous I2C block read (not defined by the SMBus specification). Reads a block of bytes from a device, from a designated register that is specified by cmd. Returns the number of bytes read.

Asynchronous SMBus write byte. Returns a Promise that will be resolved with no arguments on success, or will be rejected if an error occurs.

Scans the I2C bus asynchronously for devices. The default address range 0x03 through 0x77 is the same as the default address range used by the i2cdetect command line tool. The callback gets two arguments (err, devices). devices is an array of numbers where each number represents the I2C address of a device which was detected.

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Asynchronous I2C block read (not defined by the SMBus specification). Reads a block of bytes from a device, from a designated register that is specified by cmd. Returns a Promise that on success will be resolved with an object with a bytesRead property identifying the number of bytes read, and a buffer property that is a reference to the passed in buffer argument. The returned Promise will be rejected if an error occurs.

Asynchronous SMBus read word. Returns a Promise that will be resolved with a number representing the word read on success, or will be rejected if an error occurs. word is an unsigned integer in the range 0 to 65535.

bus.scan() - scan for I2C devices in address range 0x03 through 0x77 bus.scan(addr) - scan for an I2C device at address addr bus.scan(startAddr, endAddr) - scan for I2C devices in address range startAddr through endAddr

Asynchronous SMBus read word. The callback gets two arguments (err, word). word is an unsigned integer in the range 0 to 65535.

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Asynchronous SMBus receive byte. The callback gets two arguments (err, byte). byte is an unsigned integer in the range 0 to 255.

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Asynchronous plain I2C write. Returns a Promise that on success will be resolved with an object with a bytesWritten property identifying the number of bytes written, and a buffer property that is a reference to the passed in buffer argument. The returned promise will be rejected if an error occurs.

Asynchronous SMBus read byte. Returns a Promise that will be resolved with a number representing the byte read on success, or will be rejected if an error occurs. byte is an unsigned integer in the range 0 to 255.

Image

Asynchronous plain I2C write. The callback gets three argument (err, bytesWritten, buffer). bytesWritten is the number of bytes written.

Asynchronous I2C device Id. The callback gets two arguments (err, id). id is an object with the properties manufacturer, product and if known a human readable name for the associated manufacturer. manufacturer and product are numbers, name is a string.

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Determine functionality of the bus/adapter Synchronously. Returns a frozen I2cFuncs object describing the functionality available. See also I2C functionality.

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Asynchronous I2C block write (not defined by the SMBus specification). Writes a block of bytes to a device, to a designated register that is specified by cmd. Returns a Promise that on success will be resolved with an object with a bytesWritten property identifying the number of bytes written, and a buffer property that is a reference to the passed in buffer argument. The returned promise will be rejected if an error occurs.

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Asynchronous close. Returns a Promise that will be resolved with no arguments once the underlying resources have been released, or will be rejected if an error occurs while closing.

I2C serial bus access with Node.js on Linux boards like the Raspberry Pi or BeagleBone. The i2c-bus API supports promises and async/await, asynchronous callbacks and synchronous execution.

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Asynchronous SMBus receive byte. Returns a Promise that will be resolved with a number representing the byte received on success, or will be rejected if an error occurs. byte is an unsigned integer in the range 0 to 255.

bus.scan(cb) - scan for I2C devices in address range 0x03 through 0x77 bus.scan(addr, cb) - scan for an I2C device at address addr bus.scan(startAddr, endAddr, cb) - scan for I2C devices in address range startAddr through endAddr

The asynchronous callback form always take a completion callback as its last argument. The arguments passed to the completion callback depend on the method, but the first argument is always reserved for an exception. If the operation was completed successfully, then the first argument will be null or undefined.

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Synchronous I2C device Id. Returns an object with the properties manufacturer, product and if known a human readable name for the associated manufacturer. manufacturer and product are numbers, name is a string.

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Asynchronous SMBus send byte. Returns a Promise that will be resolved with no arguments on success, or will be rejected if an error occurs.

Specifies whether or not the adapter knows about the I2C_M_IGNORE_NAK, I2C_M_REV_DIR_ADDR and I2C_M_NO_RD_ACK flags (which modify the I2C protocol! I2C_FUNC_PROTOCOL_MANGLING).

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Asynchronous plain I2C read. Returns a Promise that on success will be resolved with an object with a bytesRead property identifying the number of bytes read, and a buffer property that is a reference to the passed in buffer argument. The returned Promise will be rejected if an error occurs.

Asynchronous I2C device Id. Returns a Promise that will be resolved with an id object on success, or will be rejected if an error occurs. id is an object with the properties manufacturer, product and if known a human readable name for the associated manufacturer. manufacturer and product are numbers, name is a string.

Scans the I2C bus synchronously for devices. The default address range 0x03 through 0x77 is the same as the default address range used by the i2cdetect command line tool. Returns an array of numbers where each number represents the I2C address of a device which was detected.

TypeScript type definitions for i2c-bus can be found in the Definitely Typed repository at https://github.com/DefinitelyTyped/DefinitelyTyped/tree/master/types/i2c-bus.

Asynchronous I2C block read (not defined by the SMBus specification). Reads a block of bytes from a device, from a designated register that is specified by cmd. The callback gets three arguments (err, bytesRead, buffer). bytesRead is the number of bytes read.

Asynchronous I2C block write (not defined by the SMBus specification). Writes a block of bytes to a device, to a designated register that is specified by cmd. The callback gets three argument (err, bytesWritten, buffer). bytesWritten is the number of bytes written.

When using the synchronous form any exceptions are immediately thrown. You can use try/catch to handle exceptions or allow them to bubble up.

Asynchronous SMBus quick command. Writes a single bit to the device. Returns a Promise that will be resolved with no arguments on success, or will be rejected if an error occurs.

Specifies whether or not the adapter handles plain I2C-level commands (Pure SMBus adapters typically can not do these, I2C_FUNC_I2C).

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All methods in class PromisifiedBus have the asynchronous promise form. For asynchronous callback and synchronous forms see class Bus.

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Determine functionality of the bus/adapter asynchronously. The callback gets two argument (err, funcs). funcs is a frozen I2cFuncs object describing the functionality available. See also I2C functionality.

Scans the I2C bus asynchronously for devices. The default address range 0x03 through 0x77 is the same as the default address range used by the i2cdetect command line tool. Returns a Promise that on success will be resolved with an array of numbers where each number represents the I2C address of a device which was detected. The returned Promise will be rejected if an error occurs.

bus.scan() - scan for I2C devices in address range 0x03 through 0x77 bus.scan(addr) - scan for an I2C device at address addr bus.scan(startAddr, endAddr) - scan for I2C devices in address range startAddr through endAddr

Asynchronous SMBus write word. Returns a Promise that will be resolved with no arguments on success, or will be rejected if an error occurs.