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Control Code with I/O and ADC working
LTC2487/LTC2487.cpp
- Committer:
- jrodenburg
- Date:
- 2018-05-16
- Revision:
- 14:69cd53434783
- Parent:
- 13:604e6933366f
- Child:
- 16:82d941b1ef21
File content as of revision 14:69cd53434783:
#include "mbed.h" #include "LTC2487.h" #include "MODSERIAL.h" namespace { const uint8_t I2C_WRITE = 0x00; const uint8_t I2C_READ = 0x01; //Channel addresses (first two bits are fixed) //0b10 EN SGL ODD A2 A1 A0 //0b10 1 1 0 0 0 0 ch0 --> 0xb0 //0b10 1 1 1 0 0 0 ch1 --> 0xb8 //0b10 1 1 0 0 0 1 ch2 --> 0xb1 //0b10 1 1 1 0 0 1 ch3 --> 0xb9 //Config Section // EN2 IM FA FB SPD GS2 GS1 GS0 // 1 0 0 0 0 0 1 0 //Initial // 1 0 0 0 1 0 1 1 //New Attempt with same gain (8x) // 1 0 0 0 1 0 0 0 //New Attempt with unity gain (1x) const uint8_t CHNL_0 = 0xb0; const uint8_t CHNL_1 = 0xb8; const uint8_t CHNL_2 = 0xb1; const uint8_t CHNL_3 = 0xb9; }; LTC2487::LTC2487 (PinName sda, PinName scl, uint8_t address, int freq): i2c( sda, scl ){ addrI2C = address; i2c.frequency(freq); } void LTC2487::setAddress(int address){ addrI2C = address; } float LTC2487::readOutput(int chnl){ char ADC_channel[1]; char ADC_data_rx[3]; char ADC_config[1]; ADC_config[0] = 0b10001000;//0x82; //0b10000010 char cmd[2]; //select channel to read switch (chnl){ case 0: ADC_channel[0] = CHNL_0; break; case 1: ADC_channel[0] = CHNL_1; break; case 2: ADC_channel[0] = CHNL_2; break; case 3: ADC_channel[0] = CHNL_3; break; } cmd[0] = ADC_channel[0]; cmd[1] = ADC_config[0]; i2c.write((addrI2C<<1)|(I2C_WRITE), cmd, 2); //must wait, otherwise breaks...*/ wait(0.08); //Read data from selected channel --> 24bits --> 23bit=SIGN 22bit=MSB 21-7bits=DATA 5-0bits=JUNK i2c.read((addrI2C<<1)|(I2C_READ), ADC_data_rx, 3); //must wait, otherwise breaks... wait(0.08); //Stitch together the bytes into a 24bit value unsigned long data = (ADC_data_rx[0] << 16) | (ADC_data_rx[1] << 8)| ADC_data_rx[2]; //Delete SIGN bit and MSB bit and remove 6 JUNK bits unsigned long ADC_Result = (data&0x3fffff)>>6; return float(float(ADC_Result)); }