Revision 0:2fe9e41f50bb, committed 2013-03-24

Comitter:

Julepalme

Date:

Sun Mar 24 11:59:09 2013 +0000

Commit message:

Library for reading the BV4205 ADC chip in autoscan mode.

Changed in this revision

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/BV4205.cpp	Sun Mar 24 11:59:09 2013 +0000
@@ -0,0 +1,79 @@
+#include "mbed.h"
+#include "BV4205.h"
+
+BV4205::BV4205(PinName sda, PinName scl, int devaddr)
+{
+    device = devaddr;
+    adc = new I2C(sda, scl);
+
+    // Set SCL freq to 75Khz
+    adc->frequency(75000);
+
+    // Reset device.
+    adc->start();
+    adc->write(device);
+    adc->write(0x95);
+    adc->stop();
+
+    // Enable ADC.
+    adc->start();
+    adc->write(device);
+    adc->write(0x05);
+    adc->write(0x01);
+    adc->stop();
+
+    // Start Autoscan.
+    adc->start();
+    adc->write(device);
+    adc->write(0x06);
+    adc->write(0x01);
+    adc->stop();
+}
+
+int BV4205::readChannel(int ch)
+{
+    if(ch >= 0 && ch <= 9) 
+    {
+        adc->start();
+        adc->write(device);
+        adc->write(0x07);
+        adc->write(ch*2);
+        adc->start();
+        adc->write(device+1);
+        wait_us(50);
+        int H = adc->read(1);
+        int L = adc->read(0);
+        adc->stop();
+        return (H<<8 | L);
+    } else
+        return 0;
+}
+
+int BV4205::readRange(int minch, int maxch, int *array)
+{
+    if(minch >= 0 && minch <= 9 && maxch >= 0 && maxch <= 9 && maxch>=minch ) 
+    {
+        adc->start();
+        adc->write(device);
+        adc->write(0x07);
+        adc->write(minch*2);
+        adc->start();
+        adc->write(device+1);
+        wait_us(50);
+        
+        int i = 0;
+        while(i < maxch-minch)
+        {
+            int H = adc->read(1);
+            int L = adc->read(1);
+            array[i] = (H<<8 | L);
+            i++;
+        }
+        int H = adc->read(1);
+        int L = adc->read(0);
+        adc->stop();
+        array[i] = (H<<8 | L);
+        return 1;
+    } else
+        return 0;
+}

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/BV4205.h	Sun Mar 24 11:59:09 2013 +0000
@@ -0,0 +1,16 @@
+#ifndef BV4205_H_
+#define BV4205_H_
+
+#include "mbed.h"
+
+class BV4205 {
+private:
+    I2C * adc;
+    int device;   
+public:
+    BV4205(PinName sda, PinName scl, int devaddr = 0x62);
+    int readChannel(int ch);
+    int readRange(int minch, int maxch, int * array);
+};
+
+#endif /* BV4205_H_ */
\ No newline at end of file