53 lines
1.8 KiB
Markdown
53 lines
1.8 KiB
Markdown
# i2c Write Number
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Write a number to a device at an I2C address using a specified number format.
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```sig
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pins.i2cWriteNumber(0, 0, NumberFormat.Int8LE, true);
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```
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### ~ hint
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**Simulator**: This function needs real hardware to work with. It's not supported in the simulator.
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### ~
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## Parameters
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* **address**: the 7-bit I2C address of the device to send to send **value** to.
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* **value**: the number to send to **address**.
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* **format**: the [NumberFormat](/types/buffer/number-format) for **value**.
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* **repeated**: if `true`, don't send a stop condition after the write. Otherwise, a stop condition is sent when `false` (the default).
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### ~ hint
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A [repeated start condition](http://www.i2c-bus.org/repeated-start-condition/) is set to help make sure that when you want to write multiple numbers from the device at one time, it can happen without interruption. A start conditon is sent (if **repeated** is `true`) each time a number is written without a matching stop condition. When the last number is written, the stop conditon can be sent by setting **repeated** to `false`. For single writes, don't use **repeated** or set it to `false`.
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### ~
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## Examples
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### Write a big endian number to a device
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Send the value `2055` to the 7-bit I2C address as a 32-bit number. The `32`, big-endian, and integer chosen for the format.
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```blocks
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pins.i2cWriteNumber(32, 2055, NumberFormat.Int32BE, false);
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```
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### Repeated writes
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Send three byte values to a device at address `33`.
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```blocks
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pins.i2cWriteNumber(33, 19, NumberFormat.Int32BE, true);
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pins.i2cWriteNumber(33, 61, NumberFormat.Int32BE, true);
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pins.i2cWriteNumber(33, 87, NumberFormat.Int32BE, false);
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```
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## See also
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[i2c read number](/reference/pins/i2c-read-number)
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[What's I2C?](http://www.i2c-bus.org/), [number format](/types/buffer/number-format)
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