Pi Firmware: Show clock error on info screen

Change-Id: I4d786215b3fa41c35277369a1b5bc502f7e13119

src/osd.c

@@ -295,11 +295,19 @@ static void show_feature(int num) {
          osd_set(3, 0, message);
          break;
       case INFO_CAL_SUMMARY:
+         if (clock_error_ppm > 0) {
+            sprintf(message, "Clk Err: %d ppm (Beeb slower than Pi)", clock_error_ppm);
+         } else if (clock_error_ppm < 0) {
+            sprintf(message, "Clk Err: %d ppm (Beeb faster than Pi)", -clock_error_ppm);
+         } else {
+            sprintf(message, "Clk Err: %d ppm (exact match)", clock_error_ppm);
+         }
+         osd_set(3, 0, message);
          if (cpld->show_cal_summary) {
-            cpld->show_cal_summary(3);
+            cpld->show_cal_summary(5);
          } else {
             sprintf(message, "show_cal_summary() not implemented");
-            osd_set(3, 0, message);
+            osd_set(5, 0, message);
          }
          break;
       case INFO_CAL_DETAILS:

src/osd.h

@@ -7,6 +7,8 @@
 
 #define ATTR_DOUBLE_SIZE (1 << 0)
 
+extern int clock_error_ppm;
+
 void osd_init();
 void osd_clear();
 void osd_set(int line, int attr, char *text);

src/rgb_to_hdmi.c

@@ -42,6 +42,7 @@ typedef void (*func_ptr)();
 cpld_t *cpld = NULL;
 unsigned char *fb = NULL;
 int pitch = 0;
+int clock_error_ppm = 0;
 
 // =============================================================
 // Local variables
@@ -285,7 +286,8 @@ static int calibrate_clock() {
    log_info(" Actual frame time = %d ns", frame_time);
 
    double error = (double) frame_time / (double) frame_ref;
-   log_info("  Frame time error = %d PPM", (int) ((error - 1.0) * 1e6));
+   clock_error_ppm = ((error - 1.0) * 1e6);
+   log_info("  Frame time error = %d PPM", clock_error_ppm );
 
    int new_clock = (int) (((double) CORE_FREQ) / error);
    log_info("     Optimal clock = %d Hz", new_clock);