Library to read and write Azoteq IQS6xx device registers via I2C.
Dependents: IQS620_HelloWorld IQS622_HelloWorld IQS624_HelloWorld IQS621_HelloWorld ... more
Library: IQS62x
Library to read and write Azoteq IQS6xx device registers via I2C.
Supported Devices
Handy Table of ProxFusion Device Features
ALS = Ambient Light Sensor PIR = Passive Infrared
IQS62x.cpp@7:5e7ea07265d9, 2017-05-12 (annotated)
- Committer:
- AzqDev
- Date:
- Fri May 12 01:36:05 2017 +0000
- Revision:
- 7:5e7ea07265d9
- Parent:
- 6:89bdb6f6a5c1
- Child:
- 8:f9c71b39c602
Added writeRegister(); configure made __weak so we can override it
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
AzqDev | 0:ce75ae1e8fc7 | 1 | // A class library for Azoteq IQS62x devices |
AzqDev | 3:e26d7c502309 | 2 | |
AzqDev | 2:c16cb655d4a4 | 3 | // Copyright 2017 Azoteq. Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. |
AzqDev | 2:c16cb655d4a4 | 4 | |
AzqDev | 7:5e7ea07265d9 | 5 | // More info on IQS624 sensor IC: http://www.azoteq.com/products/proxfusion/iqs624?mbed |
AzqDev | 3:e26d7c502309 | 6 | |
AzqDev | 6:89bdb6f6a5c1 | 7 | // IQS624 1-minute youtube video: http://bit.ly/IQS624Video |
AzqDev | 5:653138b5cae9 | 8 | |
AzqDev | 0:ce75ae1e8fc7 | 9 | #include "IQS62x.h" |
AzqDev | 0:ce75ae1e8fc7 | 10 | |
AzqDev | 0:ce75ae1e8fc7 | 11 | // constructor |
AzqDev | 0:ce75ae1e8fc7 | 12 | IQS62xIO::IQS62xIO() : |
AzqDev | 0:ce75ae1e8fc7 | 13 | i2c( IQS_I2C_DATA_PIN, IQS_I2C_CLOCK_PIN ), // first run the constructor for mbed class I2C |
AzqDev | 0:ce75ae1e8fc7 | 14 | IQSready( IQS_READY_PIN ) // first run the constructor for mbed class DigitalIn |
AzqDev | 0:ce75ae1e8fc7 | 15 | { |
AzqDev | 0:ce75ae1e8fc7 | 16 | registers = I2CBuffer; // pointer to the receive buffer |
AzqDev | 0:ce75ae1e8fc7 | 17 | I2CErrorCount = 0; // reset I2C error count |
AzqDev | 0:ce75ae1e8fc7 | 18 | i2c.frequency( I2Cspeed ); // I2C clock frequency |
AzqDev | 0:ce75ae1e8fc7 | 19 | } |
AzqDev | 0:ce75ae1e8fc7 | 20 | |
AzqDev | 7:5e7ea07265d9 | 21 | // write a single byte to an IQS62x register |
AzqDev | 7:5e7ea07265d9 | 22 | void IQS62xIO::writeRegister(int address, int data) { |
AzqDev | 7:5e7ea07265d9 | 23 | char twoBytes [2]; |
AzqDev | 7:5e7ea07265d9 | 24 | int numberOfBytes = 2; |
AzqDev | 7:5e7ea07265d9 | 25 | twoBytes[0] = address & 0xff; |
AzqDev | 7:5e7ea07265d9 | 26 | twoBytes[1] = data & 0xff; |
AzqDev | 0:ce75ae1e8fc7 | 27 | waitForReady(); |
AzqDev | 7:5e7ea07265d9 | 28 | if(0!=i2c.write(I2C_ADR,twoBytes,numberOfBytes,false)) |
AzqDev | 0:ce75ae1e8fc7 | 29 | I2CErrorCount++; |
AzqDev | 0:ce75ae1e8fc7 | 30 | } |
AzqDev | 0:ce75ae1e8fc7 | 31 | |
AzqDev | 7:5e7ea07265d9 | 32 | // configure the IQS62x |
AzqDev | 7:5e7ea07265d9 | 33 | // declared __weak so we can override it with more complex configuration routines. |
AzqDev | 7:5e7ea07265d9 | 34 | __weak void IQS62xIO::configure() { |
AzqDev | 7:5e7ea07265d9 | 35 | writeRegister(0xd0,0x40); // simplest config : just acknowledge/clear the reset flag |
AzqDev | 7:5e7ea07265d9 | 36 | } |
AzqDev | 7:5e7ea07265d9 | 37 | |
AzqDev | 0:ce75ae1e8fc7 | 38 | // read all registers from the IQS62x |
AzqDev | 0:ce75ae1e8fc7 | 39 | void IQS62xIO::readAll() { |
AzqDev | 0:ce75ae1e8fc7 | 40 | waitForReady(); |
AzqDev | 0:ce75ae1e8fc7 | 41 | const static char i2c_start_address [] = { 0x0 }; |
AzqDev | 0:ce75ae1e8fc7 | 42 | int numberOfBytes = sizeof( i2c_start_address ); |
AzqDev | 0:ce75ae1e8fc7 | 43 | // write 0 to the IQS62x address register |
AzqDev | 0:ce75ae1e8fc7 | 44 | if(0!=i2c.write(I2C_ADR,i2c_start_address,numberOfBytes,false)) |
AzqDev | 0:ce75ae1e8fc7 | 45 | I2CErrorCount++; |
AzqDev | 0:ce75ae1e8fc7 | 46 | waitForReady(); |
AzqDev | 0:ce75ae1e8fc7 | 47 | memset(I2CBuffer,0x55,I2CBufferSize); // "clear" i2c receive buffer |
AzqDev | 0:ce75ae1e8fc7 | 48 | numberOfBytes = NUMBER_OF_REGISTERS; |
AzqDev | 0:ce75ae1e8fc7 | 49 | // read register values into a buffer |
AzqDev | 0:ce75ae1e8fc7 | 50 | if(0!=i2c.read(I2C_ADR,I2CBuffer,numberOfBytes,false)) |
AzqDev | 0:ce75ae1e8fc7 | 51 | I2CErrorCount++; |
AzqDev | 0:ce75ae1e8fc7 | 52 | } |
AzqDev | 0:ce75ae1e8fc7 | 53 | |
AzqDev | 0:ce75ae1e8fc7 | 54 | // wait for IQS62x to provide a ready signal (low) on IQS62x_ready pin |
AzqDev | 0:ce75ae1e8fc7 | 55 | void IQS62xIO::waitForReady() { |
AzqDev | 0:ce75ae1e8fc7 | 56 | int timeout=0; |
AzqDev | 0:ce75ae1e8fc7 | 57 | while (1) { |
AzqDev | 0:ce75ae1e8fc7 | 58 | if(IQSready==1) break; |
AzqDev | 0:ce75ae1e8fc7 | 59 | if (timeout++ > 1000000) goto fatal_error; |
AzqDev | 0:ce75ae1e8fc7 | 60 | } |
AzqDev | 0:ce75ae1e8fc7 | 61 | timeout=0; |
AzqDev | 0:ce75ae1e8fc7 | 62 | while (1) { |
AzqDev | 0:ce75ae1e8fc7 | 63 | if(IQSready==0) break; |
AzqDev | 0:ce75ae1e8fc7 | 64 | if (timeout++ > 1000000) goto fatal_error; |
AzqDev | 0:ce75ae1e8fc7 | 65 | } |
AzqDev | 0:ce75ae1e8fc7 | 66 | return; |
AzqDev | 0:ce75ae1e8fc7 | 67 | fatal_error: |
AzqDev | 0:ce75ae1e8fc7 | 68 | error ("Fatal Error: IQS62x ready pin is not toggling"); |
AzqDev | 0:ce75ae1e8fc7 | 69 | } |