237 lines
8.3 KiB
C++
237 lines
8.3 KiB
C++
#include "pxt.h"
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using namespace pxt;
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#define MAX_FIELD_NAME_LENGTH 12
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//% color=270 weight=34
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namespace radio {
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// -------------------------------------------------------------------------
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// Radio
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// -------------------------------------------------------------------------
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bool radioEnabled = false;
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bool transmitSerialNumber = false;
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PacketBuffer packet;
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int radioEnable() {
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int r = uBit.radio.enable();
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if (r != MICROBIT_OK) {
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uBit.panic(43);
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return r;
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}
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if (!radioEnabled) {
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uBit.radio.setGroup(pxt::programHash());
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radioEnabled = true;
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}
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return r;
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}
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void broadcastMessage(int message) {
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if (radioEnable() != MICROBIT_OK) return;
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uBit.radio.event.eventReceived(MicroBitEvent(MES_BROADCAST_GENERAL_ID, message, CREATE_ONLY));
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}
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void onBroadcastMessageReceived(int message, Action f) {
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if (radioEnable() != MICROBIT_OK) return;
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registerWithDal(MES_BROADCAST_GENERAL_ID, message, f);
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}
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/**
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* Broadcasts a number over radio to any connected micro:bit in the group.
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*/
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//% help=radio/send-number
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//% weight=60
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//% blockId=radio_datagram_send block="send number %value" blockGap=8
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void sendNumber(int value) {
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if (radioEnable() != MICROBIT_OK) return;
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uint32_t t = system_timer_current_time();
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uint32_t sn = transmitSerialNumber ? microbit_serial_number() : 0;
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uint32_t buf[] = { (uint32_t)value, t, sn };
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uBit.radio.datagram.send((uint8_t*)buf, 3*sizeof(uint32_t));
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}
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/**
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* Broadcasts a name / value pair along with the device serial number
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* and running time to any connected BBC micro:bit in the group.
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* @param name the field name (max 12 characters), eg: "data"
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* @param value the numberic value
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*/
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//% help=radio/send-value
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//% weight=59
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//% blockId=radio_datagram_send_value block="send|value %name|= %value" blockGap=8
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void sendValue(StringData* name, int value) {
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if (radioEnable() != MICROBIT_OK) return;
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ManagedString n(name);
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uint32_t t = system_timer_current_time();
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uint32_t sn = transmitSerialNumber ? microbit_serial_number() : 0;
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uint8_t buf[32];
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uint32_t* buf32 = (uint32_t*)buf;
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memset(buf, 32, 0);
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buf32[0] = value; // 4 bytes: value
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buf32[1] = t; // 4 bytes: running time
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buf32[2] = sn; // 4 bytes: serial number
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uint8_t len = min(MAX_FIELD_NAME_LENGTH, n.length()); // 1 byte: string length
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if (len > 0) {
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buf[12] = len; //
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memcpy(buf + 13, n.toCharArray(), len); // 13-25: field name
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}
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uBit.radio.datagram.send(buf, 13 + len);
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}
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/**
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* Broadcasts a number over radio to any connected micro:bit in the group.
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*/
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//% help=radio/send-string
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//% weight=58
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//% blockId=radio_datagram_send_string block="send string %msg"
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void sendString(StringData* msg) {
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if (radioEnable() != MICROBIT_OK) return;
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ManagedString s(msg);
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if (s.length() > MICROBIT_RADIO_MAX_PACKET_SIZE)
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s = s.substring(0, MICROBIT_RADIO_MAX_PACKET_SIZE);
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uBit.radio.datagram.send(s);
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}
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/**
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* Reads a value sent with `stream value` and writes it
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* to the serial stream as JSON
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*/
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//% help=radio/write-value-to-serial
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//% weight=3
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//% blockId=radio_write_value_serial block="write value to serial"
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void writeValueToSerial() {
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if (radioEnable() != MICROBIT_OK) return;
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PacketBuffer p = uBit.radio.datagram.recv();
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int length = p.length();
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uint8_t* bytes = p.getBytes();
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int value;
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uBit.serial.send("{");
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if (length >= 4) {
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memcpy(&value, bytes, 4);
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uBit.serial.send("v:"); uBit.serial.send(value);
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if(length >= 8) {
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memcpy(&value, bytes + 4, 4);
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uBit.serial.send(",t:"); uBit.serial.send(value);
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if (length >= 12) {
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memcpy(&value, bytes + 8, 4);
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uBit.serial.send(",s:"); uBit.serial.send(value);
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if (length >= 13) {
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char name[MAX_FIELD_NAME_LENGTH+1];
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uint8_t len = min(MAX_FIELD_NAME_LENGTH, bytes[12]);
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memcpy(name, bytes + 13, len);
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name[len] = 0;
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uBit.serial.send(",n:\""); uBit.serial.send(name); uBit.serial.send("\"");
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}
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}
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}
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}
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uBit.serial.send("}\r\n");
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}
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/**
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* Registers code to run when a packet is received over radio.
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*/
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//% help=radio/on-data-received
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//% weight=50
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//% blockId=radio_datagram_received_event block="on data received" blockGap=8
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void onDataReceived(Action body) {
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if (radioEnable() != MICROBIT_OK) return;
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registerWithDal(MICROBIT_ID_RADIO, MICROBIT_RADIO_EVT_DATAGRAM, body);
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}
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/**
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* Reads a number at a given index, between ``0`` and ``3``, from the packet received by ``receive number``. Not supported in simulator.
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* @param index index of the number to read from 0 to 3. 1 eg
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*/
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//% help=radio/received-number-at
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//% weight=45 debug=true
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//% blockId=radio_datagram_received_number_at block="receive number|at %VALUE" blockGap=8
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int receivedNumberAt(int index) {
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if (radioEnable() != MICROBIT_OK) return 0;
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if (0 <= index && index < packet.length() / 4) {
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// packet.getBytes() is not aligned
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int r;
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memcpy(&r, packet.getBytes() + index * 4, 4);
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return r;
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}
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return 0;
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}
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/**
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* Reads the next packet as a number from the radio queue.
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*/
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//% help=radio/receive-number
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//% weight=46
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//% blockId=radio_datagram_receive block="receive number" blockGap=8
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int receiveNumber()
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{
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if (radioEnable() != MICROBIT_OK) return 0;
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packet = uBit.radio.datagram.recv();
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return receivedNumberAt(0);
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}
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/**
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* Reads the next packet as a string and returns it.
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*/
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//% blockId=radio_datagram_receive_string block="receive string" blockGap=8
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//% weight=44
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//% help=radio/receive-string
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StringData* receiveString() {
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if (radioEnable() != MICROBIT_OK) return ManagedString().leakData();
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packet = uBit.radio.datagram.recv();
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return ManagedString(packet).leakData();
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}
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/**
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* Gets the received signal strength indicator (RSSI) from the packet received by ``receive number``. Not supported in simulator.
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* namespace=radio
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*/
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//% help=radio/received-signal-strength
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//% weight=40
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//% blockId=radio_datagram_rssi block="received signal strength"
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int receivedSignalStrength() {
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if (radioEnable() != MICROBIT_OK) return 0;
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return packet.getRSSI();
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}
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/**
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* Sets the group id for radio communications. A micro:bit can only listen to one group ID at any time.
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* @ param id the group id between ``0`` and ``255``, 1 eg
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*/
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//% help=radio/set-group
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//% weight=10
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//% blockId=radio_set_group block="set group %ID"
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void setGroup(int id) {
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if (radioEnable() != MICROBIT_OK) return;
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uBit.radio.setGroup(id);
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}
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/**
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* Change the output power level of the transmitter to the given value.
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* @param power a value in the range 0..7, where 0 is the lowest power and 7 is the highest, 7 eg
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*/
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//% help=radio/set-transmit-power
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//% weight=9
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//% blockId=radio_set_transmit_power block="set transmit power %power"
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void setTransmitPower(int power) {
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if (radioEnable() != MICROBIT_OK) return;
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uBit.radio.setTransmitPower(power);
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}
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/**
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* Set the radio to transmit the serial number in each message.
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*/
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//% help=radio/set-transmit-serial-number
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//% weight=8
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//% block=radio_set_transmit_serial_number block="set tranmist serial number %transmit"
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void setTransmitSerialNumber(bool transmit) {
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transmitSerialNumber = transmit;
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}
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}
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