Rivian Irvine Team / Mbed 2 deprecated TCTF_Control_Main

Control Code with I/O and ADC working

Dependencies:   MODSERIAL mbed

LTC2487/LTC2487.cpp@5:0f38a0bd4f86, 2018-03-01 (annotated)

Committer:
jrodenburg
Date:
Thu Mar 01 21:13:55 2018 +0000
Revision:
5:0f38a0bd4f86
Parent:
2:bd118a724f03
Child:
6:c980535393ed
3/1/2018 Code

Who changed what in which revision?

UserRevisionLine numberNew contents of line
jrodenburg 0:a28a1035c31b 1 #include "mbed.h"
jrodenburg 0:a28a1035c31b 2 #include "LTC2487.h"
jrodenburg 0:a28a1035c31b 3 #include "MODSERIAL.h"
jrodenburg 0:a28a1035c31b 4
jrodenburg 1:0182b86f9bd4 5 MODSERIAL pc3(USBTX, USBRX);
jrodenburg 1:0182b86f9bd4 6
jrodenburg 0:a28a1035c31b 7 namespace {
jrodenburg 0:a28a1035c31b 8 const uint8_t I2C_WRITE = 0x00;
jrodenburg 0:a28a1035c31b 9 const uint8_t I2C_READ = 0x01;
jrodenburg 0:a28a1035c31b 10
jrodenburg 0:a28a1035c31b 11 //Channel addresses
jrodenburg 0:a28a1035c31b 12 //0b10110000 ch0 --> 0xb0
jrodenburg 0:a28a1035c31b 13 //0b10111000 ch1 --> 0xb8
jrodenburg 0:a28a1035c31b 14 //0b10110001 ch2 --> 0xb1
jrodenburg 0:a28a1035c31b 15 //0b10111001 ch3 --> 0xb9
jrodenburg 0:a28a1035c31b 16 const uint8_t CHNL_0 = 0xb0;
jrodenburg 0:a28a1035c31b 17 const uint8_t CHNL_1 = 0xb8;
jrodenburg 0:a28a1035c31b 18 const uint8_t CHNL_2 = 0xb1;
jrodenburg 0:a28a1035c31b 19 const uint8_t CHNL_3 = 0xb9;
jrodenburg 0:a28a1035c31b 20 };
jrodenburg 0:a28a1035c31b 21
jrodenburg 0:a28a1035c31b 22 LTC2487::LTC2487 (PinName sda, PinName scl, uint8_t address, int freq): i2c( sda, scl ){
jrodenburg 0:a28a1035c31b 23 addrI2C = address;
jrodenburg 0:a28a1035c31b 24 i2c.frequency(freq);
jrodenburg 0:a28a1035c31b 25 }
jrodenburg 0:a28a1035c31b 26
jrodenburg 0:a28a1035c31b 27 void LTC2487::setAddress(int address){
jrodenburg 0:a28a1035c31b 28 addrI2C = address;
jrodenburg 0:a28a1035c31b 29 }
jrodenburg 0:a28a1035c31b 30
jrodenburg 0:a28a1035c31b 31 float LTC2487::readOutput(int chnl){
jrodenburg 0:a28a1035c31b 32 char ADC_channel[1];
jrodenburg 0:a28a1035c31b 33 char ADC_data_rx[3];
jrodenburg 0:a28a1035c31b 34 char ADC_config[1];
jrodenburg 0:a28a1035c31b 35 ADC_config[0] = 0x82;
jrodenburg 0:a28a1035c31b 36
jrodenburg 0:a28a1035c31b 37 //select channel to read
jrodenburg 0:a28a1035c31b 38 switch (chnl){
jrodenburg 0:a28a1035c31b 39 case 0:
jrodenburg 0:a28a1035c31b 40 ADC_channel[0] = CHNL_0;
jrodenburg 0:a28a1035c31b 41 break;
jrodenburg 0:a28a1035c31b 42 case 1:
jrodenburg 0:a28a1035c31b 43 ADC_channel[0] = CHNL_1;
jrodenburg 0:a28a1035c31b 44 break;
jrodenburg 0:a28a1035c31b 45 case 2:
jrodenburg 0:a28a1035c31b 46 ADC_channel[0] = CHNL_2;
jrodenburg 0:a28a1035c31b 47 break;
jrodenburg 0:a28a1035c31b 48 case 3:
jrodenburg 0:a28a1035c31b 49 ADC_channel[0] = CHNL_3;
jrodenburg 0:a28a1035c31b 50 break;
jrodenburg 0:a28a1035c31b 51 }
jrodenburg 0:a28a1035c31b 52
jrodenburg 0:a28a1035c31b 53 //send message to select channel
jrodenburg 0:a28a1035c31b 54 i2c.write((addrI2C<<1)|(I2C_WRITE), ADC_channel, 1);
jrodenburg 0:a28a1035c31b 55 //must wait, otherwise breaks...
jrodenburg 5:0f38a0bd4f86 56 wait(0.08);
jrodenburg 2:bd118a724f03 57 //send configuration (1 gain, autocalibration)
jrodenburg 0:a28a1035c31b 58 i2c.write((addrI2C<<1)|(I2C_WRITE), ADC_config, 1);
jrodenburg 0:a28a1035c31b 59 //must wait, otherwise breaks...
jrodenburg 5:0f38a0bd4f86 60 wait(0.08);
jrodenburg 0:a28a1035c31b 61 //Read data from selected channel --> 24bits --> 23bit=SIGN 22bit=MSB 21-7bits=DATA 5-0bits=JUNK
jrodenburg 2:bd118a724f03 62 i2c.read((addrI2C<<1)|(I2C_READ), ADC_data_rx, 3);
jrodenburg 5:0f38a0bd4f86 63 wait(0.08);
jrodenburg 2:bd118a724f03 64 //Stitch together the bytes into a 24bit value
jrodenburg 0:a28a1035c31b 65 unsigned long data = (ADC_data_rx[0] << 16) | (ADC_data_rx[1] << 8)| ADC_data_rx[2];
jrodenburg 0:a28a1035c31b 66 //Delete SIGN bit and MSB bit and remove 6 JUNK bits
jrodenburg 1:0182b86f9bd4 67 unsigned long ADC_Result = (data&0x3fffff)>>6;
jrodenburg 1:0182b86f9bd4 68
jrodenburg 0:a28a1035c31b 69 return float(float(ADC_Result));
jrodenburg 0:a28a1035c31b 70
jrodenburg 0:a28a1035c31b 71 }