Yihui Xiong / Mbed 2 deprecated TouchPixel

to colorize a colorful pixel with a simple touch using nfc technology

Dependencies:   Chainable_RGB_LED mbed

use Arch, NFC Shield and Grove - Chainable RGB LED to DIY a touch pixel. Then use an Android with NFC support to colorize it.

The project is on https://github.com/Seeed-Studio/TouchPixel

main.cpp@0:88960f3eeb2c, 2013-12-27 (annotated)

Committer:
yihui
Date:
Fri Dec 27 01:46:32 2013 +0000
Revision:
0:88960f3eeb2c
initial

Who changed what in which revision?

UserRevisionLine numberNew contents of line
yihui 0:88960f3eeb2c 1
yihui 0:88960f3eeb2c 2 #include "mbed.h"
yihui 0:88960f3eeb2c 3 #include "ChainableLED.h"
yihui 0:88960f3eeb2c 4 #include "PN532_SPI.h"
yihui 0:88960f3eeb2c 5 #include "emulatetag.h"
yihui 0:88960f3eeb2c 6 #include "NdefMessage.h"
yihui 0:88960f3eeb2c 7
yihui 0:88960f3eeb2c 8 #include <string.h>
yihui 0:88960f3eeb2c 9
yihui 0:88960f3eeb2c 10 #define LOG(args...)
yihui 0:88960f3eeb2c 11
yihui 0:88960f3eeb2c 12 BusOut leds(LED1, LED2, LED3, LED4);
yihui 0:88960f3eeb2c 13
yihui 0:88960f3eeb2c 14 ChainableLED rgbled(P1_14, P1_13, 1);
yihui 0:88960f3eeb2c 15
yihui 0:88960f3eeb2c 16 SPI spi(P1_22, P1_21, P1_20);
yihui 0:88960f3eeb2c 17 PN532_SPI interface(spi, P0_2);
yihui 0:88960f3eeb2c 18 EmulateTag nfc(interface);
yihui 0:88960f3eeb2c 19
yihui 0:88960f3eeb2c 20 uint8_t ndefBuf[120];
yihui 0:88960f3eeb2c 21 NdefMessage message;
yihui 0:88960f3eeb2c 22 int messageSize;
yihui 0:88960f3eeb2c 23
yihui 0:88960f3eeb2c 24 uint8_t uid[3] = { 0x12, 0x34, 0x56 };
yihui 0:88960f3eeb2c 25
yihui 0:88960f3eeb2c 26 uint32_t getColor(uint8_t *buf)
yihui 0:88960f3eeb2c 27 {
yihui 0:88960f3eeb2c 28 uint32_t x = 0;
yihui 0:88960f3eeb2c 29 for (uint8_t i = 0; i < 8; i++) {
yihui 0:88960f3eeb2c 30 uint8_t c = *buf;
yihui 0:88960f3eeb2c 31 if (c >= '0' && c <= '9') {
yihui 0:88960f3eeb2c 32 x *= 16;
yihui 0:88960f3eeb2c 33 x += c - '0';
yihui 0:88960f3eeb2c 34 } else if (c >= 'A' && c <= 'F') {
yihui 0:88960f3eeb2c 35 x *= 16;
yihui 0:88960f3eeb2c 36 x += (c - 'A') + 10;
yihui 0:88960f3eeb2c 37 } else if (c >= 'a' && c <= 'f') {
yihui 0:88960f3eeb2c 38 x *= 16;
yihui 0:88960f3eeb2c 39 x += (c - 'a') + 10;
yihui 0:88960f3eeb2c 40 } else
yihui 0:88960f3eeb2c 41 break;
yihui 0:88960f3eeb2c 42
yihui 0:88960f3eeb2c 43 buf++;
yihui 0:88960f3eeb2c 44 }
yihui 0:88960f3eeb2c 45
yihui 0:88960f3eeb2c 46 return x;
yihui 0:88960f3eeb2c 47 }
yihui 0:88960f3eeb2c 48
yihui 0:88960f3eeb2c 49 void processNewNdef(uint8_t *buf, uint16_t length)
yihui 0:88960f3eeb2c 50 {
yihui 0:88960f3eeb2c 51 NdefMessage msg = NdefMessage(buf, length);
yihui 0:88960f3eeb2c 52
yihui 0:88960f3eeb2c 53 NdefRecord record = msg.getRecord(0);
yihui 0:88960f3eeb2c 54 uint8_t recordbuf[32];
yihui 0:88960f3eeb2c 55 record.getType(recordbuf);
yihui 0:88960f3eeb2c 56 if (!memcmp(recordbuf, "text/c", 6)) {
yihui 0:88960f3eeb2c 57 uint8_t r, g, b;
yihui 0:88960f3eeb2c 58 uint32_t color;
yihui 0:88960f3eeb2c 59 record.getPayload(recordbuf);
yihui 0:88960f3eeb2c 60 color = getColor(recordbuf);
yihui 0:88960f3eeb2c 61 r = (color >> 16) & 0xFF;
yihui 0:88960f3eeb2c 62 g = (color >> 8) & 0xFF;
yihui 0:88960f3eeb2c 63 b = color & 0xFF;
yihui 0:88960f3eeb2c 64
yihui 0:88960f3eeb2c 65 rgbled.setColorRGB(0, r, g, b);
yihui 0:88960f3eeb2c 66 leds = r;
yihui 0:88960f3eeb2c 67 }
yihui 0:88960f3eeb2c 68 }
yihui 0:88960f3eeb2c 69
yihui 0:88960f3eeb2c 70 int main()
yihui 0:88960f3eeb2c 71 {
yihui 0:88960f3eeb2c 72 LOG("------- Emulate Tag --------\n");
yihui 0:88960f3eeb2c 73 rgbled.setColorRGB(0, 0, 0, 0);
yihui 0:88960f3eeb2c 74
yihui 0:88960f3eeb2c 75 NdefRecord aarRecord = NdefRecord();
yihui 0:88960f3eeb2c 76 const uint8_t aarType[] = "android.com:pkg";
yihui 0:88960f3eeb2c 77 const uint8_t aarPayload[] = "com.seeedstudio.android.nfc.touchpixel";
yihui 0:88960f3eeb2c 78
yihui 0:88960f3eeb2c 79 aarRecord.setTnf(TNF_EXTERNAL_TYPE);
yihui 0:88960f3eeb2c 80 aarRecord.setType(aarType, sizeof(aarType) - 1);
yihui 0:88960f3eeb2c 81 aarRecord.setPayload(aarPayload, sizeof(aarPayload) - 1);
yihui 0:88960f3eeb2c 82
yihui 0:88960f3eeb2c 83 message = NdefMessage();
yihui 0:88960f3eeb2c 84 message.addMimeMediaRecord("text/c", "FF000000");
yihui 0:88960f3eeb2c 85 message.addRecord(aarRecord);
yihui 0:88960f3eeb2c 86 messageSize = message.getEncodedSize();
yihui 0:88960f3eeb2c 87 if (messageSize > sizeof(ndefBuf)) {
yihui 0:88960f3eeb2c 88 while (1) { }
yihui 0:88960f3eeb2c 89 }
yihui 0:88960f3eeb2c 90
yihui 0:88960f3eeb2c 91 LOG("Ndef encoded message size: %d\n", messageSize);
yihui 0:88960f3eeb2c 92
yihui 0:88960f3eeb2c 93 message.encode(ndefBuf);
yihui 0:88960f3eeb2c 94
yihui 0:88960f3eeb2c 95 // comment out this command for no ndef message
yihui 0:88960f3eeb2c 96 nfc.setNdefFile(ndefBuf, messageSize);
yihui 0:88960f3eeb2c 97
yihui 0:88960f3eeb2c 98 // uid must be 3 bytes!
yihui 0:88960f3eeb2c 99 nfc.setUid(uid);
yihui 0:88960f3eeb2c 100
yihui 0:88960f3eeb2c 101 nfc.init();
yihui 0:88960f3eeb2c 102
yihui 0:88960f3eeb2c 103 nfc.attach(processNewNdef);
yihui 0:88960f3eeb2c 104
yihui 0:88960f3eeb2c 105 while (1) {
yihui 0:88960f3eeb2c 106 //nfc.setNdefFile(ndefBuf, messageSize);
yihui 0:88960f3eeb2c 107 nfc.emulate();
yihui 0:88960f3eeb2c 108 }
yihui 0:88960f3eeb2c 109 }