Revision 0:ce75ae1e8fc7, committed 2017-02-04

Comitter:

AzqDev

Date:

Sat Feb 04 07:19:09 2017 +0000

Child:

1:2f08ab339e17

Commit message:

Initial commit

Changed in this revision

--- /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");
+}
\ No newline at end of file

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/IQS62x.h	Sat Feb 04 07:19:09 2017 +0000
@@ -0,0 +1,29 @@
+// A class library for Azoteq IQS62x devices
+#include "mbed.h"
+
+// Verify these 3 pin definitions if your hardware is not on the list of tested boards
+// If your board has an Arduino interface the definitions below will likely work
+
+#define IQS_I2C_CLOCK_PIN I2C_SCL   /* on NUCLEO boards this is marked as SCL/D15 on CN5 */
+#define IQS_I2C_DATA_PIN I2C_SDA    /* on NUCLEO boards this is marked as SDA/D14 on CN5 */
+#define IQS_READY_PIN D2            /* on NUCLEO boards this is marked as D2 on CN9 */
+
+#define I2C_ADR (0x44 << 1) /* I2C address of IQS62x */
+#define I2CSPEED 100000 /* I2C clock speed */
+#define NUMBER_OF_REGISTERS 224 /* number of registers to read from IQS62x */
+#define I2CBufferSize 256 /* size of I2C read buffer */
+
+class IQS62xIO { // basic IQS62x block read and write
+  public:
+    I2C i2c; // I2C interface
+    DigitalIn IQSready; // ready pin
+    const static int I2Cspeed = I2CSPEED; // I2C clock rate
+    int I2CErrorCount; // number of I2C errors
+    char I2CBuffer [I2CBufferSize]; // I2C read buffer
+    char * registers; // pointer to I2C read buffer
+    IQS62xIO(); // constructor    
+    
+    void configure(); // write configuration registers of the IQS62x    
+    void readAll(); // read all registers from the IQS62x     
+    void waitForReady(); // wait for IQS62x ready signal
+};
\ No newline at end of file