Stefan Waldschmidt
Test maximal GPIO output performance by toggling a GPIO output pin as fast as possible.
This mbed program creates a thread with Realtime Priority to do nothing but to toggle a GPIO output as fast as possible.
Measurements are performed on a NUCLEO-F767ZI board https://os.mbed.com/platforms/ST-Nucleo-F767ZI/.
- STM32F767ZIT6 @ 216 MHz
- Duration of high or low phases: 4 nsec - 10 nsec (resulting is something from 50 MHz to 125 MHz)
Revision 0:f122acadb07b, committed 2019-05-13
- Comitter:
- stefanwaldschmidt
- Date:
- Mon May 13 12:28:40 2019 +0000
- Commit message:
- initial commit
Changed in this revision
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/.gitignore Mon May 13 12:28:40 2019 +0000 @@ -0,0 +1,4 @@ +.build +.mbed +projectfiles +*.py*
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp Mon May 13 12:28:40 2019 +0000
@@ -0,0 +1,35 @@
+/*
+ Test GPIO-output toggle time
+
+ Hardware: NUCLEO-F767ZI
+ STM32F767ZIT6 @ 216 MHz
+ Libraries:
+ mbed-os-5.12.3
+ Measured gpio_out frequency
+ * total period: 8 nsec - 20 nsec (125 MHz - 50 MHz)
+*/
+
+#include "mbed.h"
+
+DigitalOut gpio_out(PC_8);
+
+void run()
+{
+ while (true) {
+ gpio_out = 1;
+ gpio_out = 0;
+ gpio_out = 1;
+ gpio_out = 0;
+ }
+}
+
+int main()
+{
+ Thread *thread = new Thread(osPriorityRealtime);
+
+ thread->start(run);
+
+ while (true) {
+ wait(0.1); // 100 ns
+ }
+}
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/mbed-os.lib Mon May 13 12:28:40 2019 +0000 @@ -0,0 +1,1 @@ +https://github.com/ARMmbed/mbed-os.git/#0f959dbe4749c20416236e4fe1dac5692cbe18ab