CJ Shaw / HY3116

Important changes to repositories hosted on mbed.com

Mbed hosted mercurial repositories are deprecated and are due to be permanently deleted in July 2026.

To keep a copy of this software download the repository Zip archive or clone locally using Mercurial.

It is also possible to export all your personal repositories from the account settings page.

HY3116.cpp@0:80768ca5d5ff, 2016-05-11 (annotated)

Committer:
seajayshore
Date:
Wed May 11 12:11:43 2016 +0000
Revision:
0:80768ca5d5ff
Child:
1:1967c3f48465
1st commit! woo!

Who changed what in which revision?

UserRevisionLine numberNew contents of line
seajayshore 0:80768ca5d5ff 1 #include "HY3116.h"
seajayshore 0:80768ca5d5ff 2
seajayshore 0:80768ca5d5ff 3 // Define I2C pins (SDA,SCL)
seajayshore 0:80768ca5d5ff 4 static I2C i2c(p30,p7); // nRF51-DK
seajayshore 0:80768ca5d5ff 5
seajayshore 0:80768ca5d5ff 6 // Single-byte write helper function
seajayshore 0:80768ca5d5ff 7 void HY3116::writeByte(uint8_t address, uint8_t subAddress, uint8_t data)
seajayshore 0:80768ca5d5ff 8 {
seajayshore 0:80768ca5d5ff 9 char data_write[2];
seajayshore 0:80768ca5d5ff 10 data_write[0]=subAddress; // I2C sends MSB first. Namely >>|subAddress|>>|data|
seajayshore 0:80768ca5d5ff 11 data_write[1]=data;
seajayshore 0:80768ca5d5ff 12 i2c.write(address,data_write,2,0); // i2c.write(int address, char* data, int length, bool repeated=false);
seajayshore 0:80768ca5d5ff 13 }
seajayshore 0:80768ca5d5ff 14
seajayshore 0:80768ca5d5ff 15 // Function to send the reset command
seajayshore 0:80768ca5d5ff 16 void HY3116::resetChip()
seajayshore 0:80768ca5d5ff 17 {
seajayshore 0:80768ca5d5ff 18 char data_write[1];
seajayshore 0:80768ca5d5ff 19 data_write[0]=RESET;
seajayshore 0:80768ca5d5ff 20 i2c.write(HY3116_ADDRESS,data_write,1,0); // i2c.write(int address, char* data, int length, bool repeated=false);
seajayshore 0:80768ca5d5ff 21 }
seajayshore 0:80768ca5d5ff 22
seajayshore 0:80768ca5d5ff 23 // Multi-byte read helper function
seajayshore 0:80768ca5d5ff 24 void HY3116::readBytes(uint8_t address, uint8_t subAddress, uint8_t byteNum, uint8_t* dest, bool alreadyRead)
seajayshore 0:80768ca5d5ff 25 {
seajayshore 0:80768ca5d5ff 26 char data[14],data_write[1];
seajayshore 0:80768ca5d5ff 27 data_write[0]=subAddress;
seajayshore 0:80768ca5d5ff 28 if (!alreadyRead) {
seajayshore 0:80768ca5d5ff 29 i2c.write(address,data_write,1,1);
seajayshore 0:80768ca5d5ff 30 }
seajayshore 0:80768ca5d5ff 31 i2c.read(address,data,byteNum,0);
seajayshore 0:80768ca5d5ff 32 for(int i=0;i<byteNum;i++) // equate the addresses
seajayshore 0:80768ca5d5ff 33 dest[i]=data[i];
seajayshore 0:80768ca5d5ff 34 }
seajayshore 0:80768ca5d5ff 35
seajayshore 0:80768ca5d5ff 36 // Dedicated ADC-output read, check & format function
seajayshore 0:80768ca5d5ff 37 int32_t HY3116::readAdc(bool alreadyRead)
seajayshore 0:80768ca5d5ff 38 {
seajayshore 0:80768ca5d5ff 39 uint8_t rawData[3];
seajayshore 0:80768ca5d5ff 40 bool newReading = 0;
seajayshore 0:80768ca5d5ff 41 int32_t adcReading = 0;
seajayshore 0:80768ca5d5ff 42
seajayshore 0:80768ca5d5ff 43 readBytes(HY3116_ADDRESS, ADO, 3, &rawData[0], alreadyRead);
seajayshore 0:80768ca5d5ff 44
seajayshore 0:80768ca5d5ff 45 if (rawData[2] & 0b00000001) {
seajayshore 0:80768ca5d5ff 46 newReading = 1;
seajayshore 0:80768ca5d5ff 47 }
seajayshore 0:80768ca5d5ff 48 else {
seajayshore 0:80768ca5d5ff 49 newReading = 0;
seajayshore 0:80768ca5d5ff 50 }
seajayshore 0:80768ca5d5ff 51
seajayshore 0:80768ca5d5ff 52 adcReading += rawData[0] << 15;
seajayshore 0:80768ca5d5ff 53 adcReading += rawData[1] << 7;
seajayshore 0:80768ca5d5ff 54 adcReading += rawData[2] >> 1;
seajayshore 0:80768ca5d5ff 55
seajayshore 0:80768ca5d5ff 56 // Account for twos complement polarity
seajayshore 0:80768ca5d5ff 57 if (rawData[0] & 0b10000000) {
seajayshore 0:80768ca5d5ff 58 adcReading ^= 0xFF800000;
seajayshore 0:80768ca5d5ff 59 }
seajayshore 0:80768ca5d5ff 60
seajayshore 0:80768ca5d5ff 61 return adcReading;
seajayshore 0:80768ca5d5ff 62 }
seajayshore 0:80768ca5d5ff 63
seajayshore 0:80768ca5d5ff 64 // Initialise the HY3116 with the following config.:
seajayshore 0:80768ca5d5ff 65 //
seajayshore 0:80768ca5d5ff 66 void HY3116::init()
seajayshore 0:80768ca5d5ff 67 {
seajayshore 0:80768ca5d5ff 68 // Set the I2C clock frequency
seajayshore 0:80768ca5d5ff 69 i2c.frequency(100000);
seajayshore 0:80768ca5d5ff 70
seajayshore 0:80768ca5d5ff 71 // Set-up the SYS register
seajayshore 0:80768ca5d5ff 72 writeByte(HY3116_ADDRESS, SYS, 0b00011100); // Enable the ADC & LDO
seajayshore 0:80768ca5d5ff 73 wait_ms(100); // wait 100 ms to stabilize
seajayshore 0:80768ca5d5ff 74
seajayshore 0:80768ca5d5ff 75 // Set-up the ADC1 register
seajayshore 0:80768ca5d5ff 76 writeByte(HY3116_ADDRESS, ADC1, 0b00001000); // Set inputs to AIN1 & AIN2
seajayshore 0:80768ca5d5ff 77 wait_ms(100); // wait 100 ms to stabilize
seajayshore 0:80768ca5d5ff 78
seajayshore 0:80768ca5d5ff 79 // Set-up the ADC2 register
seajayshore 0:80768ca5d5ff 80 writeByte(HY3116_ADDRESS, ADC2, 0b01010000); // Set pos. ref. voltage to VDDA, neg. ref. to VSSA, DC offset to 0VRef
seajayshore 0:80768ca5d5ff 81 wait_ms(100); // wait 100 ms to stabilize
seajayshore 0:80768ca5d5ff 82
seajayshore 0:80768ca5d5ff 83 // Set-up the ADC3 register
seajayshore 0:80768ca5d5ff 84 writeByte(HY3116_ADDRESS, ADC3, 0b01111100); // Set to int. osc. 327kHz, full ref. range, PGA to 32x, pre-amp to 1x
seajayshore 0:80768ca5d5ff 85 wait_ms(100); // wait 100 ms to stabilize
seajayshore 0:80768ca5d5ff 86
seajayshore 0:80768ca5d5ff 87 // Set-up the ADC4 register
seajayshore 0:80768ca5d5ff 88 writeByte(HY3116_ADDRESS, ADC4, 0b01011110); // Set LDO to 3.0V, REFO = 1.2V, conv. rate = 327kHz, SPS = 40
seajayshore 0:80768ca5d5ff 89 wait_ms(100); // wait 100 ms to stabilize
seajayshore 0:80768ca5d5ff 90
seajayshore 0:80768ca5d5ff 91 resetChip();
seajayshore 0:80768ca5d5ff 92 wait_ms(500);
seajayshore 0:80768ca5d5ff 93 }