Alex Leung / Mbed OS HealthTracker

Test version

DS1621.cpp@0:4be500de690c, 2018-03-20 (annotated)

Committer:
a2824256
Date:
Tue Mar 20 02:09:21 2018 +0000
Revision:
0:4be500de690c
test

Who changed what in which revision?

UserRevisionLine numberNew contents of line
a2824256 0:4be500de690c 1 #include "mbed.h"
a2824256 0:4be500de690c 2
a2824256 0:4be500de690c 3 //Serial pc2(USBTX, USBRX);
a2824256 0:4be500de690c 4 I2C i2cTem(PB_9, PB_8); //i2c device constructor
a2824256 0:4be500de690c 5 //9E = 1001 1110
a2824256 0:4be500de690c 6 const int addr = 0x90; //8 bit (addr|0) - all config bits=0 (floating)
a2824256 0:4be500de690c 7 //First 4 bits are 1001 (set by manufacturer)
a2824256 0:4be500de690c 8 int* ReadDS1621(void)
a2824256 0:4be500de690c 9 {
a2824256 0:4be500de690c 10 char cmd[2]; // command buffer (re-usable)
a2824256 0:4be500de690c 11 static int data[2] = {0, 0}; //data being read
a2824256 0:4be500de690c 12 // AC = 1010 1100
a2824256 0:4be500de690c 13 cmd[0] = 0xAC;
a2824256 0:4be500de690c 14 i2cTem.write(addr, cmd, 1, false); // Access Config
a2824256 0:4be500de690c 15 // 02 = 0000 0010
a2824256 0:4be500de690c 16 cmd[0] = 0x02; // 2 = continuous convert, POL=1
a2824256 0:4be500de690c 17 i2cTem.write(addr, cmd, 1, false); //continuous conversions
a2824256 0:4be500de690c 18 //pc2.printf("start %i:%i\n",(int)cmd[0],(int)cmd[1]);
a2824256 0:4be500de690c 19 wait_ms(20); // allow time for ee write
a2824256 0:4be500de690c 20 // EE = 1110 1110
a2824256 0:4be500de690c 21 cmd[0] = 0xEE; //238=start conversions - needs 10ms delay
a2824256 0:4be500de690c 22 i2cTem.write(addr, cmd, 1, false); //try sending stop
a2824256 0:4be500de690c 23 //pc2.printf("%i:%i\n",(int)cmd[0],(int)cmd[1]);
a2824256 0:4be500de690c 24 wait_ms(20); //20ms
a2824256 0:4be500de690c 25 // AA = 1010 1010
a2824256 0:4be500de690c 26 cmd[0] = 0xAA; //to issue 'Read temp'
a2824256 0:4be500de690c 27 i2cTem.write(addr, cmd, 1, false);
a2824256 0:4be500de690c 28 //pc2.printf("%i:%i\n",(int)cmd[0],(int)cmd[1]);
a2824256 0:4be500de690c 29 i2cTem.read(addr, cmd, 2, false);
a2824256 0:4be500de690c 30 //pc2.printf("%i:%i\n",(int)cmd[0],(int)cmd[1]);
a2824256 0:4be500de690c 31 data[0] = (int)cmd[0];
a2824256 0:4be500de690c 32 data[1] = (int)cmd[1];
a2824256 0:4be500de690c 33 return (int*)data;
a2824256 0:4be500de690c 34 }