Azoteq / IQS62x

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

Components / IQS620A
Ultra low power sensor for magnetic field, capacitive touch and inductive proximity. Empowers next-generation user interfaces.

Components / IQS621
Azoteq IQS621 ultra low power sensor for ambient light, magnetic field, capacitance and inductive proximity. Empowers next-generation user interfaces.

Components / IQS622
Azoteq IQS622 ultra low power sensor for ambient light, active (reflective) IR, magnetic field, capacitance and inductive proximity. Empowers next-generation user interfaces.

Components / IQS624
Ultra low power sensor for rotating magnetic field, capacitive touch, and inductive proximity. Empowers next-generation user interfaces.

Handy Table of ProxFusion Device Features


ALS = Ambient Light Sensor PIR = Passive Infrared

/media/uploads/AzqDev/mbed-azoteq-proxfusion-handy-table-of-product-features.jpg

IQS62x.cpp@14:2514595e2753, 2017-05-13 (annotated)

Committer:
AzqDev
Date:
Sat May 13 10:12:37 2017 +0000
Revision:
14:2514595e2753
Parent:
13:71f8ee16a3a1
Child:
15:6a2f52b5ac46
Added readChangesEver to count all changes after frame 20

Who changed what in which revision?

UserRevisionLine numberNew 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 12:5a9bbbd6e312 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 12:5a9bbbd6e312 15 {
AzqDev 0:ce75ae1e8fc7 16 registers = I2CBuffer; // pointer to the receive buffer
AzqDev 0:ce75ae1e8fc7 17 I2CErrorCount = 0; // reset I2C error count
AzqDev 14:2514595e2753 18 IQSframes = 0; // reset number of reads
AzqDev 0:ce75ae1e8fc7 19 i2c.frequency( I2Cspeed ); // I2C clock frequency
AzqDev 12:5a9bbbd6e312 20
AzqDev 12:5a9bbbd6e312 21 // this uses memory but is very handy in diagnostics
AzqDev 14:2514595e2753 22 memset(writeFlag, 0, I2CBufferSize); // a table to remmber if we wrote to a register
AzqDev 14:2514595e2753 23 memset(lastWrite, 0, I2CBufferSize); // a table to remember what we wrote to a register
AzqDev 14:2514595e2753 24 memset(lastRead, 0, I2CBufferSize); // a table to remmber what we read the previous read cycle
AzqDev 14:2514595e2753 25 memset(readChanges, 0, I2CBufferSize); // a table to mark up any registers that changed since the previous read
AzqDev 14:2514595e2753 26 memset(readChangesEver, 0, I2CBufferSize); // a table to mark up any registers that changed BUT never forget
AzqDev 14:2514595e2753 27 memset(writeChanges, 0, I2CBufferSize); // a table to mark up any registers that differs from what was written to it
AzqDev 12:5a9bbbd6e312 28 }
AzqDev 0:ce75ae1e8fc7 29
AzqDev 7:5e7ea07265d9 30 // write a single byte to an IQS62x register
AzqDev 12:5a9bbbd6e312 31 void IQS62xIO::writeRegister(int address, int data)
AzqDev 12:5a9bbbd6e312 32 {
AzqDev 12:5a9bbbd6e312 33 writeFlag[ address & 0xff ] = 1; // remember which registers we changed
AzqDev 12:5a9bbbd6e312 34 lastWrite[ address & 0xff ] = data & 0xff; // remember what we wrote
AzqDev 7:5e7ea07265d9 35 char twoBytes [2];
AzqDev 7:5e7ea07265d9 36 int numberOfBytes = 2;
AzqDev 7:5e7ea07265d9 37 twoBytes[0] = address & 0xff;
AzqDev 7:5e7ea07265d9 38 twoBytes[1] = data & 0xff;
AzqDev 12:5a9bbbd6e312 39 waitForIqsReady();
AzqDev 12:5a9bbbd6e312 40 if(0!=i2c.write(I2C_ADR,twoBytes,numberOfBytes,false))
AzqDev 0:ce75ae1e8fc7 41 I2CErrorCount++;
AzqDev 0:ce75ae1e8fc7 42 }
AzqDev 0:ce75ae1e8fc7 43
AzqDev 7:5e7ea07265d9 44 // configure the IQS62x
AzqDev 8:f9c71b39c602 45 #include "deviceType.h" // to check if we should override the configuration definition
AzqDev 8:f9c71b39c602 46 #ifndef OVERRIDE_CONFIGURE
AzqDev 9:7c2666dfbc9a 47 // if there is no override for configure() then we use this simple version
AzqDev 12:5a9bbbd6e312 48 void IQS62xIO::configure()
AzqDev 12:5a9bbbd6e312 49 {
AzqDev 7:5e7ea07265d9 50 writeRegister(0xd0,0x40); // simplest config : just acknowledge/clear the reset flag
AzqDev 7:5e7ea07265d9 51 }
AzqDev 8:f9c71b39c602 52 #endif
AzqDev 7:5e7ea07265d9 53
AzqDev 10:8fdac52881aa 54 // read N registers, starting at provided offset
AzqDev 12:5a9bbbd6e312 55 void IQS62xIO::readIqsRegisters(int start, int count)
AzqDev 12:5a9bbbd6e312 56 {
AzqDev 10:8fdac52881aa 57 memset(I2CBuffer,0x55,I2CBufferSize); // "clear" i2c receive buffer
AzqDev 14:2514595e2753 58 IQSframes++; // count frames
AzqDev 12:5a9bbbd6e312 59 waitForIqsReady();
AzqDev 12:5a9bbbd6e312 60 char i2c_start_address [1];
AzqDev 10:8fdac52881aa 61 i2c_start_address[0] = start & 0xff;
AzqDev 10:8fdac52881aa 62 int numberOfBytes = 1;
AzqDev 10:8fdac52881aa 63 // write start address to the IQS62x address register
AzqDev 12:5a9bbbd6e312 64 if(0!=i2c.write(I2C_ADR,i2c_start_address,numberOfBytes,false))
AzqDev 0:ce75ae1e8fc7 65 I2CErrorCount++;
AzqDev 12:5a9bbbd6e312 66 waitForIqsReady();
AzqDev 10:8fdac52881aa 67 numberOfBytes = count % I2CBufferSize;
AzqDev 0:ce75ae1e8fc7 68 // read register values into a buffer
AzqDev 0:ce75ae1e8fc7 69 if(0!=i2c.read(I2C_ADR,I2CBuffer,numberOfBytes,false))
AzqDev 0:ce75ae1e8fc7 70 I2CErrorCount++;
AzqDev 12:5a9bbbd6e312 71
AzqDev 12:5a9bbbd6e312 72 #define PLEASE_CHECK_FOR_IQS_CHANGES 1
AzqDev 12:5a9bbbd6e312 73 #ifndef DONT_CHECK_FOR_IQS_CHANGES
AzqDev 12:5a9bbbd6e312 74 // this is optional but handy diagnostics
AzqDev 12:5a9bbbd6e312 75 // we build two tables:
AzqDev 12:5a9bbbd6e312 76 // writeChanges[i] is set to 1 if the register content differs from what we wrote to it
AzqDev 12:5a9bbbd6e312 77 // readChanges[i] is set to 1 if the register value differs from the previously read value
AzqDev 14:2514595e2753 78 if (IQSframes < 20) memset(readChangesEver,0,I2CBufferSize); // clear this until we have had 20 full reads
AzqDev 12:5a9bbbd6e312 79 for(int i=0; i<I2CBufferSize; i++) {
AzqDev 12:5a9bbbd6e312 80 if (writeFlag[i] == 1) { // only if we previously wrote to this register we check it
AzqDev 12:5a9bbbd6e312 81 if( I2CBuffer[i] != lastWrite[i] )
AzqDev 12:5a9bbbd6e312 82 writeChanges[i]=1; // if register different from what we wrote, mark it
AzqDev 12:5a9bbbd6e312 83 }
AzqDev 14:2514595e2753 84 if ( I2CBuffer[i] != lastRead[i] ) {
AzqDev 13:71f8ee16a3a1 85 readChanges[i]=20; // if register differs from previous read, highlight it for 20 read cycles
AzqDev 14:2514595e2753 86 if (readChangesEver[i] < 127) readChangesEver[i]++; // count changes up to 127 and never forget
AzqDev 14:2514595e2753 87 } else {
AzqDev 13:71f8ee16a3a1 88 if (readChanges[i] > 0) readChanges[i]--; // bring it closer to zero
AzqDev 13:71f8ee16a3a1 89 }
AzqDev 12:5a9bbbd6e312 90 }
AzqDev 12:5a9bbbd6e312 91 memcpy(lastRead, I2CBuffer, I2CBufferSize); // preserve data for next round
AzqDev 12:5a9bbbd6e312 92 #endif
AzqDev 0:ce75ae1e8fc7 93 }
AzqDev 0:ce75ae1e8fc7 94
AzqDev 0:ce75ae1e8fc7 95 // wait for IQS62x to provide a ready signal (low) on IQS62x_ready pin
AzqDev 12:5a9bbbd6e312 96 void IQS62xIO::waitForIqsReady()
AzqDev 12:5a9bbbd6e312 97 {
AzqDev 12:5a9bbbd6e312 98 int timeout=0;
AzqDev 0:ce75ae1e8fc7 99 while (1) {
AzqDev 0:ce75ae1e8fc7 100 if(IQSready==1) break;
AzqDev 12:5a9bbbd6e312 101 if (timeout++ > 1000000) goto fatal_error;
AzqDev 0:ce75ae1e8fc7 102 }
AzqDev 0:ce75ae1e8fc7 103 timeout=0;
AzqDev 0:ce75ae1e8fc7 104 while (1) {
AzqDev 0:ce75ae1e8fc7 105 if(IQSready==0) break;
AzqDev 0:ce75ae1e8fc7 106 if (timeout++ > 1000000) goto fatal_error;
AzqDev 0:ce75ae1e8fc7 107 }
AzqDev 0:ce75ae1e8fc7 108 return;
AzqDev 12:5a9bbbd6e312 109 fatal_error:
AzqDev 12:5a9bbbd6e312 110 error ("Fatal Error: IQS62x ready pin is not toggling");
AzqDev 0:ce75ae1e8fc7 111 }