Diff: IQS62x.cpp

Revision:

0:ce75ae1e8fc7

Child:

2:c16cb655d4a4

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/IQS62x.cpp	Sat Feb 04 07:19:09 2017 +0000
@@ -0,0 +1,55 @@
+// A class library for Azoteq IQS62x devices
+#include "IQS62x.h"
+
+// constructor
+IQS62xIO::IQS62xIO() : 
+    i2c( IQS_I2C_DATA_PIN, IQS_I2C_CLOCK_PIN ), // first run the constructor for mbed class I2C
+    IQSready( IQS_READY_PIN )                   // first run the constructor for mbed class DigitalIn
+{    
+    registers = I2CBuffer; // pointer to the receive buffer
+    I2CErrorCount = 0; // reset I2C error count
+    i2c.frequency( I2Cspeed ); // I2C clock frequency
+}    
+
+// write some configuration data to the IQS62x
+void IQS62xIO::configure() {
+    const static char system_register_setup_data [] = { 0xd0, 0x40 }; 
+    int numberOfBytes = sizeof( system_register_setup_data );
+    waitForReady();
+    // clear the reset bit in register 0xd0
+    if(0!=i2c.write(I2C_ADR,system_register_setup_data,numberOfBytes,false)) 
+        I2CErrorCount++;
+}
+
+// read all registers from the IQS62x
+void IQS62xIO::readAll() {
+    waitForReady();
+    const static char i2c_start_address [] = { 0x0 };
+    int numberOfBytes = sizeof( i2c_start_address );
+    // write 0 to the IQS62x address register
+    if(0!=i2c.write(I2C_ADR,i2c_start_address,numberOfBytes,false)) 
+        I2CErrorCount++;
+    waitForReady();
+    memset(I2CBuffer,0x55,I2CBufferSize); // "clear" i2c receive buffer
+    numberOfBytes = NUMBER_OF_REGISTERS;
+    // read register values into a buffer
+    if(0!=i2c.read(I2C_ADR,I2CBuffer,numberOfBytes,false))
+        I2CErrorCount++;
+}
+
+// wait for IQS62x to provide a ready signal (low) on IQS62x_ready pin
+void IQS62xIO::waitForReady() {
+    int timeout=0; 
+    while (1) {
+        if(IQSready==1) break;
+        if (timeout++ > 1000000) goto fatal_error; 
+    }
+    timeout=0;
+    while (1) {
+        if(IQSready==0) break;
+        if (timeout++ > 1000000) goto fatal_error;
+    }
+    return;
+    fatal_error:
+        error ("Fatal Error: IQS62x ready pin is not toggling");
+}
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