62 lines
2.2 KiB
TypeScript
62 lines
2.2 KiB
TypeScript
//% color=351 weight=30
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namespace pins {
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/**
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* Re-maps a number from one range to another. That is, a value of ``from low`` would get mapped to ``to low``, a value of ``from high`` to ``to high``, values in-between to values in-between, etc.
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* @param value value to map in ranges
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* @param fromLow the lower bound of the value's current range
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* @param fromHigh the upper bound of the value's current range, eg: 1023
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* @param toLow the lower bound of the value's target range
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* @param toHigh the upper bound of the value's target range, eg: 4
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*/
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//% help=pins/map weight=15
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//% blockId=math_map block="map %value|from low %fromLow|from high %fromHigh|to low %toLow|to high %toHigh"
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export function map(value: number, fromLow: number, fromHigh: number, toLow: number, toHigh: number): number {
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return ((value - fromLow) * (toHigh - toLow)) / (fromHigh - fromLow) + toLow;
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}
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/**
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* Read one number from 7-bit I2C address.
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*/
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export function i2cReadNumber(address: number, format: NumberFormat): number {
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let buf = pins.i2cReadBuffer(address, pins.sizeOf(format))
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return buf.getNumber(format, 0)
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}
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/**
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* Write one number to a 7-bit I2C address.
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*/
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export function i2cWriteNumber(address: number, value: number, format: NumberFormat): void {
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let buf = createBuffer(pins.sizeOf(format))
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buf.setNumber(format, 0, value)
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pins.i2cWriteBuffer(address, buf)
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}
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/**
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* Get the size in bytes of specified number format.
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*/
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export function sizeOf(format: NumberFormat) {
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switch (format) {
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case NumberFormat.Int8LE:
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case NumberFormat.UInt8LE:
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case NumberFormat.Int8BE:
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case NumberFormat.UInt8BE:
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return 1;
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case NumberFormat.Int16LE:
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case NumberFormat.UInt16LE:
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case NumberFormat.Int16BE:
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case NumberFormat.UInt16BE:
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return 2;
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case NumberFormat.Int32LE:
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case NumberFormat.Int32BE:
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return 4;
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}
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return 0;
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}
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}
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interface Buffer {
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[index: number]: number;
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// rest defined in buffer.cpp
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}
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