The meter

git-svn-id: https://svn.spreadspace.org/mur.sat@214 7de4ea59-55d0-425e-a1af-a3118ea81d4c

1 files changed, 37 insertions, 0 deletions

diff --git a/tools/solarmeter/solarmeter.c b/tools/solarmeter/solarmeter.c
new file mode 100644
index 0000000..e2c76e1
--- /dev/null
+++ b/tools/solarmeter/solarmeter.c
@@ -0,0 +1,37 @@
+#include <stdio.h>
+#include <unistd.h>
+
+// data via stdin
+// begin = 255 followed by 9 byte  8 mal i + 1 mal u
+// u = input * 5/256  // u in V
+// i = input / 2.099  // i in mA
+
+#define UFAC 5.0f/256.0f
+
+int main (int argc, char* argv[])
+{
+    unsigned char tmp = 0;
+    unsigned char buffer[9];
+    int i;
+
+    // printf ("blah\n");
+    while (read (STDIN_FILENO, &tmp, 1) == 1)
+    {
+        if (tmp == 255)
+        {
+            if (read (STDIN_FILENO, &buffer, 9) != 9)
+            {
+                printf ("read error\n");
+                return 0;
+            }
+            printf ("%02.2fV ", buffer[8] * UFAC);
+            for (i = 0; i<8; i++)
+            {
+                printf ("%02.2fmW ", (buffer[i] / 2.099f) * (buffer[8] * UFAC));
+            }
+            printf ("\r");
+        }
+    }
+    printf ("\n");
+    return 0;
+}