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Add Buffer.get/setNumber and i2c methods

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This commit is contained in:
Michal Moskal 2016-04-04 19:02:40 -07:00
parent 61fd28d840
commit bd7430b642
6 changed files with 174 additions and 18 deletions
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78
libs/microbit/buffer.cpp
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@ -1,5 +1,19 @@
#include "ksbit.h"
enum class NumberFormat {
Int8LE = 1,
UInt8LE,
Int16LE,
UInt16LE,
Int32LE,
Int8BE,
UInt8BE,
Int16BE,
UInt16BE,
Int32BE,
// UInt32,
};
//% indexerGet=BufferMethods::getByte indexerSet=BufferMethods::setByte
namespace BufferMethods {
//%
@ -17,6 +31,70 @@ namespace BufferMethods {
return buf->payload;
}
/**
* Write a number in specified format in the buffer.
*/
//%
void setNumber(Buffer buf, NumberFormat format, int offset, int value)
{
int8_t i8;
uint8_t u8;
int16_t i16;
uint16_t u16;
int32_t i32;
ManagedBuffer b(buf);
// Assume little endian
#define WRITEBYTES(isz, swap) isz = value; b.writeBytes(offset, (uint8_t*)&isz, sizeof(isz), swap); break
switch (format) {
case NumberFormat::Int8LE: WRITEBYTES(i8, false);
case NumberFormat::UInt8LE: WRITEBYTES(u8, false);
case NumberFormat::Int16LE: WRITEBYTES(i16, false);
case NumberFormat::UInt16LE: WRITEBYTES(u16, false);
case NumberFormat::Int32LE: WRITEBYTES(i32, false);
case NumberFormat::Int8BE: WRITEBYTES(i8, true);
case NumberFormat::UInt8BE: WRITEBYTES(u8, true);
case NumberFormat::Int16BE: WRITEBYTES(i16, true);
case NumberFormat::UInt16BE: WRITEBYTES(u16, true);
case NumberFormat::Int32BE: WRITEBYTES(i32, true);
}
}
/**
* Read a number in specified format from the buffer.
*/
//%
int getNumber(Buffer buf, NumberFormat format, int offset)
{
int8_t i8;
uint8_t u8;
int16_t i16;
uint16_t u16;
int32_t i32;
ManagedBuffer b(buf);
// Assume little endian
#define READBYTES(isz, swap) b.readBytes((uint8_t*)&isz, offset, sizeof(isz), swap); return isz
switch (format) {
case NumberFormat::Int8LE: READBYTES(i8, false);
case NumberFormat::UInt8LE: READBYTES(u8, false);
case NumberFormat::Int16LE: READBYTES(i16, false);
case NumberFormat::UInt16LE: READBYTES(u16, false);
case NumberFormat::Int32LE: READBYTES(i32, false);
case NumberFormat::Int8BE: READBYTES(i8, true);
case NumberFormat::UInt8BE: READBYTES(u8, true);
case NumberFormat::Int16BE: READBYTES(i16, true);
case NumberFormat::UInt16BE: READBYTES(u16, true);
case NumberFormat::Int32BE: READBYTES(i32, true);
}
return 0;
}
/** Returns the length of a Buffer object. */
//% property
int length(Buffer s) {

15
libs/microbit/enums.d.ts vendored
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@ -271,4 +271,19 @@ declare namespace pins {
declare namespace serial {
}
declare enum NumberFormat {
Int8LE = 1,
UInt8LE = 2,
Int16LE = 3,
UInt16LE = 4,
Int32LE = 5,
Int8BE = 6,
UInt8BE = 7,
Int16BE = 8,
UInt16BE = 9,
Int32BE = 10,
// UInt32,
}
// Auto-generated. Do not edit. Really.

1
libs/microbit/kind.json
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@ -22,6 +22,7 @@
"led.ts",
"music.ts",
"pins.cpp",
"pins.ts",
"serial.cpp",
"serial.ts",
"buffer.cpp"

35
libs/microbit/pins.cpp
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@ -195,25 +195,24 @@ namespace pins {
{
return ManagedBuffer(size).leakData();
}
/**
* Read `size` bytes from a 7-bit I2C `address`.
*/
//% repeat.defl=0
Buffer i2cReadBuffer(int address, int size, bool repeat)
{
Buffer buf = createBuffer(size);
uBit.i2c.read(address << 1, (char*)buf->payload, size, repeat);
return buf;
}
// TODO:
void i2cReadBuffer(int address, RefBuffer *buf)
/**
* Write bytes to a 7-bit I2C `address`.
*/
//% repeat.defl=0
void i2cWriteBuffer(int address, Buffer buf, bool repeat)
{
uBit.i2c.read(address << 1, buf->cptr(), buf->size());
}
void i2cWriteBuffer(int address, RefBuffer *buf)
{
uBit.i2c.write(address << 1, buf->cptr(), buf->size());
}
int i2cReadRaw(int address, char *data, int length, int repeated)
{
return uBit.i2c.read(address, data, length, repeated);
}
int i2cWriteRaw(int address, const char *data, int length, int repeated)
{
return uBit.i2c.write(address, data, length, repeated);
uBit.i2c.write(address << 1, (char*)buf->payload, buf->length, repeat);
}
}

39
libs/microbit/pins.ts
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@ -13,4 +13,43 @@ namespace pins {
export function map(value: number, fromLow: number, fromHigh: number, toLow: number, toHigh: number): number {
return ((value - fromLow) * (toHigh - toLow)) / (fromHigh - fromLow) + toLow;
}
/**
* Read one number from 7-bit I2C address.
*/
export function i2cReadNumber(address: number, format: NumberFormat): number {
let buf = pins.i2cReadBuffer(address, pins.sizeOf(format), false)
return buf.getNumber(format, 0)
}
/**
* Write one number to a 7-bit I2C address.
*/
export function i2cWriteNumber(address: number, value: number, format: NumberFormat): void {
let buf = createBuffer(pins.sizeOf(format))
buf.setNumber(format, 0, value)
pins.i2cWriteBuffer(address, buf, false)
}
/**
* Get the size in bytes of specified number format.
*/
export function sizeOf(format: NumberFormat) {
switch (format) {
case NumberFormat.Int8LE:
case NumberFormat.UInt8LE:
case NumberFormat.Int8BE:
case NumberFormat.UInt8BE:
return 1;
case NumberFormat.Int16LE:
case NumberFormat.UInt16LE:
case NumberFormat.Int16BE:
case NumberFormat.UInt16BE:
return 2;
case NumberFormat.Int32LE:
case NumberFormat.Int32BE:
return 4;
}
return 0;
}
}

24
libs/microbit/shims.d.ts vendored
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@ -541,6 +541,18 @@ declare namespace pins {
*/
//% shim=pins::createBuffer
function createBuffer(size: number): Buffer;
/**
* Read `size` bytes from a 7-bit I2C `address`.
*/
//% repeat.defl=0 shim=pins::i2cReadBuffer
function i2cReadBuffer(address: number, size: number, repeat: boolean): Buffer;
/**
* Write bytes to a 7-bit I2C `address`.
*/
//% repeat.defl=0 shim=pins::i2cWriteBuffer
function i2cWriteBuffer(address: number, buf: Buffer, repeat: boolean): void;
}
@ -577,6 +589,18 @@ declare namespace serial {
//% indexerGet=BufferMethods::getByte indexerSet=BufferMethods::setByte
declare interface Buffer {
/**
* Write a number in specified format in the buffer.
*/
//% shim=BufferMethods::setNumber
setNumber(format: NumberFormat, offset: number, value: number): void;
/**
* Read a number in specified format from the buffer.
*/
//% shim=BufferMethods::getNumber
getNumber(format: NumberFormat, offset: number): number;
/** Returns the length of a Buffer object. */
//% property shim=BufferMethods::length
length: number;