mbed-os-examples
Example to demonstrate usage of `mbed_stats_cpu_get()` API usage
Revision 0:3114f82feb68, committed 2018-06-05
- Comitter:
- mbed_official
- Date:
- Tue Jun 05 17:34:16 2018 +0100
- Child:
- 1:1eaa9a7bd9b1
- Commit message:
- Initial commit.
Commit copied from https://github.com/ARMmbed/mbed-os-example-cpu-stats
Changed in this revision
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/.gitignore Tue Jun 05 17:34:16 2018 +0100 @@ -0,0 +1,4 @@ +.build +.mbed +projectfiles +*.py*
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/README.md Tue Jun 05 17:34:16 2018 +0100 @@ -0,0 +1,57 @@ +# Getting started with CPU Stats on Mbed OS + +This guide reviews the steps required to get CPU statistics on Mbed OS platform. + +Please install [mbed CLI](https://github.com/ARMmbed/mbed-cli#installing-mbed-cli). + +## Import the example application + +From the command-line, import the example: + +``` +mbed import mbed-os-example-cpu-stats +cd mbed-os-example-cpu-stats +``` + +### Now compile + +Invoke `mbed compile`, and specify the name of your platform and your favorite toolchain (`GCC_ARM`, `ARM`, `IAR`). For example, for the ARM Compiler 5: + +``` +mbed compile -m K64F -t ARM +``` + +Your PC may take a few minutes to compile your code. At the end, you see the following result: + +``` +[snip] ++------------------+-------+-------+------+ +| Module | .text | .data | .bss | ++------------------+-------+-------+------+ +| [lib]\c_w.l | 11473 | 16 | 348 | +| [lib]\cpprt_w.l | 36 | 0 | 0 | +| [lib]\fz_wm.l | 18 | 0 | 0 | +| [lib]\m_wm.l | 48 | 0 | 0 | +| anon$$obj.o | 32 | 0 | 1024 | +| main.o | 530 | 8 | 0 | +| mbed-os\drivers | 165 | 0 | 0 | +| mbed-os\events | 2139 | 8 | 1568 | +| mbed-os\features | 132 | 0 | 304 | +| mbed-os\hal | 1910 | 34 | 128 | +| mbed-os\platform | 3695 | 104 | 604 | +| mbed-os\rtos | 17302 | 2310 | 4592 | +| mbed-os\targets | 10707 | 112 | 324 | +| Subtotals | 48187 | 2592 | 8892 | ++------------------+-------+-------+------+ +Total Static RAM memory (data + bss): 11484 bytes +Total Flash memory (text + data): 50779 bytes + +Image: .\BUILD\K64F\ARM\mbed-os-example-cpu-stats.bin + +``` + +### Program your board + +1. Connect your Mbed device to the computer over USB. +1. Copy the binary file to the Mbed device. +1. Press the reset button to start the program.
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp Tue Jun 05 17:34:16 2018 +0100
@@ -0,0 +1,61 @@
+#include "mbed.h"
+
+#if !defined(MBED_CPU_STATS_ENABLED) || !defined(DEVICE_LPTICKER) || !defined(DEVICE_SLEEP)
+#error [NOT_SUPPORTED] test not supported
+#endif
+
+DigitalOut led1(LED1);
+
+#define MAX_THREAD_STACK 384
+#define SAMPLE_TIME 1000
+#define LOOP_TIME 3000
+
+uint64_t prev_idle_time = 0;
+int32_t wait_time = 5000;
+
+void busy_thread()
+{
+ volatile uint64_t i = ~0;
+
+ while(i--) {
+ led1 = !led1;
+ wait_us(wait_time);
+ }
+}
+
+void print_stats()
+{
+ mbed_stats_cpu_t stats;
+ mbed_stats_cpu_get(&stats);
+
+ printf("%-20lld", stats.uptime);
+ printf("%-20lld", stats.idle_time);
+ printf("%-20lld", stats.sleep_time);
+ printf("%-20lld\n", stats.deep_sleep_time);
+}
+
+int main()
+{
+ // Request the shared queue
+ EventQueue *stats_queue = mbed_event_queue();
+ Thread *thread;
+ int id;
+
+ id = stats_queue->call_every(SAMPLE_TIME, print_stats);
+ printf("%-20s%-20s%-20s%-20s\n", "Uptime", "Idle Time", "Sleep time", "DeepSleep time");
+
+ thread = new Thread(osPriorityNormal, MAX_THREAD_STACK);
+ thread->start(busy_thread);
+
+ // Steadily increase the system load
+ for (int count = 1; ; count++) {
+ Thread::wait(LOOP_TIME);
+ if (wait_time <= 0) {
+ break;
+ }
+ wait_time -= 1000;
+ }
+ thread->terminate();
+ stats_queue->cancel(id);
+ return 0;
+}
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/mbed-os.lib Tue Jun 05 17:34:16 2018 +0100 @@ -0,0 +1,1 @@ +https://github.com/ARMmbed/mbed-os/#5371c107353f20ab79edcbe8a005cb7c0ea9249e
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/mbed_app.json Tue Jun 05 17:34:16 2018 +0100
@@ -0,0 +1,3 @@
+{
+ "macros": ["MBED_CPU_STATS_ENABLED"]
+}