Renato Loureiro / Mbed 2 deprecated 1_wire_ibutton

ibutton read with modified ds18b20 libraries

Dependencies:   mbed

Due to the lack of programs for ibutton interfacing with mbed, i built this one (still needs a lot of development), it's in a very basic state, but i'm working on it...

DS1Wire.cpp@0:4f399e4b64a9, 2013-08-23 (annotated)

Committer:
Renato
Date:
Fri Aug 23 08:36:59 2013 +0000
Revision:
0:4f399e4b64a9
Function to read ibutton serial & family

Who changed what in which revision?

UserRevisionLine numberNew contents of line
Renato 0:4f399e4b64a9 1 #include "DS1Wire.h"
Renato 0:4f399e4b64a9 2 #include "mbed.h"
Renato 0:4f399e4b64a9 3 #include <stdint.h>
Renato 0:4f399e4b64a9 4
Renato 0:4f399e4b64a9 5 // Timing delay for 1-wire serial standard option
Renato 0:4f399e4b64a9 6 enum DELAY { A = 6, B = 64, C = 60, D = 10, E = 9, F = 55, G = 0, H = 480, I = 70, J = 410 };
Renato 0:4f399e4b64a9 7
Renato 0:4f399e4b64a9 8
Renato 0:4f399e4b64a9 9 int Reset(DigitalInOut& pin) {
Renato 0:4f399e4b64a9 10 pin.output();
Renato 0:4f399e4b64a9 11 pin = 0; // drive bus low
Renato 0:4f399e4b64a9 12 wait_us(H);
Renato 0:4f399e4b64a9 13 pin.input(); // release bus
Renato 0:4f399e4b64a9 14 wait_us(I);
Renato 0:4f399e4b64a9 15 uint32_t result = pin; // read bus value
Renato 0:4f399e4b64a9 16 wait_us(J);
Renato 0:4f399e4b64a9 17 return result;
Renato 0:4f399e4b64a9 18 }
Renato 0:4f399e4b64a9 19
Renato 0:4f399e4b64a9 20 void WriteBit(DigitalInOut& pin, uint32_t bit) {
Renato 0:4f399e4b64a9 21 pin.output();
Renato 0:4f399e4b64a9 22 if (bit) {
Renato 0:4f399e4b64a9 23 pin = 0; // drive bus low
Renato 0:4f399e4b64a9 24 wait_us(A); // delay A
Renato 0:4f399e4b64a9 25 pin.input(); // release bus
Renato 0:4f399e4b64a9 26 wait_us(B); // delay B
Renato 0:4f399e4b64a9 27 } else {
Renato 0:4f399e4b64a9 28 pin = 0; // drive bus low
Renato 0:4f399e4b64a9 29 wait_us(C); // delay C
Renato 0:4f399e4b64a9 30 pin.input(); // release bus
Renato 0:4f399e4b64a9 31 wait_us(D); // delay D
Renato 0:4f399e4b64a9 32 }
Renato 0:4f399e4b64a9 33 }
Renato 0:4f399e4b64a9 34
Renato 0:4f399e4b64a9 35 uint32_t ReadBit(DigitalInOut& pin) {
Renato 0:4f399e4b64a9 36 uint32_t bit_value;
Renato 0:4f399e4b64a9 37 pin.output();
Renato 0:4f399e4b64a9 38 pin = 0; // drive bus low
Renato 0:4f399e4b64a9 39 wait_us(A); // delay A
Renato 0:4f399e4b64a9 40 pin.input(); // release bus
Renato 0:4f399e4b64a9 41 wait_us(E); // delay E
Renato 0:4f399e4b64a9 42 bit_value = pin; // master sample bus
Renato 0:4f399e4b64a9 43 wait_us(F);
Renato 0:4f399e4b64a9 44 return bit_value;
Renato 0:4f399e4b64a9 45 }
Renato 0:4f399e4b64a9 46
Renato 0:4f399e4b64a9 47 void WriteByte(DigitalInOut& pin, uint32_t byte) {
Renato 0:4f399e4b64a9 48 for (uint32_t bit = 0; bit < 8; ++bit) {
Renato 0:4f399e4b64a9 49 WriteBit(pin, byte & 0x01); // lsb to msb
Renato 0:4f399e4b64a9 50 byte >>= 1; // right shift by 1-bit
Renato 0:4f399e4b64a9 51 }
Renato 0:4f399e4b64a9 52 }
Renato 0:4f399e4b64a9 53
Renato 0:4f399e4b64a9 54 uint32_t ReadByte(DigitalInOut& pin) {
Renato 0:4f399e4b64a9 55 uint32_t byte = 0;
Renato 0:4f399e4b64a9 56 for (uint32_t bit = 0; bit < 8; ++bit) {
Renato 0:4f399e4b64a9 57 byte |= (ReadBit(pin) << bit); // Reads lsb to msb
Renato 0:4f399e4b64a9 58 }
Renato 0:4f399e4b64a9 59 return byte;
Renato 0:4f399e4b64a9 60 }