Diff: AD7994.cpp

Revision:

0:6089ae824f06

Child:

1:83960ee4d9a2

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/AD7994.cpp	Mon Dec 26 15:58:32 2011 +0000
@@ -0,0 +1,47 @@
+
+#include "mbed.h"
+#include "AD7994.h"
+
+#define AD7994ADDR   (0x44)
+
+AD7994::AD7994(PinName p_sda, PinName p_scl) : i2c(p_sda, p_scl)
+{
+    memset(ch_val,0,sizeof(ch_val));
+}
+
+void AD7994::Start()
+{
+    char cmd_set[] = { 0x02,0x38 };
+    char cmd_tim[] = { 0x03,0x01 };
+    i2c.write(AD7994ADDR,cmd_set,sizeof(cmd_set));
+    i2c.write(AD7994ADDR,cmd_tim,sizeof(cmd_tim));
+}
+
+unsigned short AD7994::getVal()
+{
+    char cmd[] = { 0x00 };
+    char buf[2];
+    unsigned short res = 0;
+    i2c.write(AD7994ADDR,cmd,sizeof(cmd));
+    i2c.read(AD7994ADDR,buf,sizeof(buf));
+    res = buf[0];
+    res = (res << 8) | buf[1];
+    return res;
+}
+
+void AD7994::update()
+{
+    int i;
+    unsigned short res;
+    unsigned short idx;
+    for(i=0;i<4;i++){
+        res = getVal();
+        idx = (res >> 12) & 0x03;
+        ch_val[idx] = res & 0x0FFF;
+    }
+}
+
+unsigned short AD7994::readChn(int chnNo)
+{
+    return ch_val[chnNo];
+}