1 files changed, 60 insertions, 0 deletions
diff --git a/frontends/calculator/CEdev/examples/stopwatch/src/main.c b/frontends/calculator/CEdev/examples/stopwatch/src/main.c
new file mode 100644
index 0000000..3ec82b1
--- /dev/null
+++ b/frontends/calculator/CEdev/examples/stopwatch/src/main.c
@@ -0,0 +1,60 @@
+#include <stdbool.h>
+#include <stddef.h>
+#include <stdint.h>
+#include <tice.h>
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+/* Print a stopwatch value on the home screen */
+void print(float elapsed) {
+    /* Float format for printf may be unimplemented, so go through an OS real */
+    real_t elapsed_real;
+
+    /* Max stopwatch value is (2^32 - 1) / 32768 = 131072.00, */
+    /* so create a buffer with room for 9 characters plus a null terminator */
+    char str[10];
+
+    /* If the elapsed time is small enough that the OS would print it using */
+    /* scientific notation, force it down to zero before conversion */
+    elapsed_real = os_FloatToReal(elapsed <= 0.001f ? 0.0f : elapsed);
+
+    /* Convert the elapsed time real to a string */
+    os_RealToStr(str, &elapsed_real, 8, 1, 2);
+
+    /* Print the string */
+    os_SetCursorPos(0, 0);
+    os_PutStrFull(str);
+}
+
+/* Put all your code here */
+void main(void) {
+    /* Clear the homescreen */
+    os_ClrHome();
+
+    /* Display an initial time of zero */
+    print(0.0f);
+
+    /* Disable the timer */
+    timer_Control = TIMER1_DISABLE;
+
+    /* Reset the timer's counter */
+    timer_1_Counter = 0;
+
+    /* Wait for a key press */
+    while (!os_GetCSC());
+
+    /* Enable the timer while setting it to 32768 KHz and making it count up */
+    timer_Control = TIMER1_ENABLE | TIMER1_32K | TIMER1_UP;
+
+    /* Continue running until a key is pressed */
+    do {
+        /* Calculate and print the elapsed time */
+        float elapsed = (float)atomic_load_increasing_32(&timer_1_Counter) / 32768;
+        print(elapsed);
+    } while (!os_GetCSC());
+
+    /* Wait for a key press */
+    while (!os_GetCSC());
+}