Hello all,
I am having an issue with using the 'Debug (printf) Window' to display debugging messages as the code runs. Upon startup I print simple initialization messages using the printf function which displays an index(printIndex) or count of the message that is being printed and the message(msg) itself.
printf("%003u - L: %s\r\n",printIndex++, msg);
Most of these messages are display in the 'Debug (printf) Window' but not all of them, some are missed. If I set a breakpoint after printf() then all messages are displayed.
After the RTOS threads start up and begin to perform their tasks the printf() function the likelihood of getting printf() message is even worse and I will see erroneous characters and spaces get printed to the 'Debug (printf) Window'.
My guess is that there is a timing issue between the RTOS and the ITM debugging port.
I am using a ULINK2/ME Cortex Debugger, settings are; Debug SWJ: Checked Port: SW Max Clock: 500kHz (I have tried various speeds without any change in the results)
Trace Trace Port Core Clock: 16.384MHz (My HSE freq) Trace Enable: Checked SWO Clock Prescalar: 14 (Autodetect: Checked) SWO Clock: 1.170285MHz
Timestamps Enable: Checked Prescalar: 1
Trace Events SLEEP: Sleep Cycles: Checked EXCTRC: Exception Tracing: Checked
ITM Stimulus Ports Enable: 0x00000001 Privilege: 0x00000008
In 'Manage Run-Time Environment' I have selected the following: CMSIS -CORE (5.0.1) -RTOS(API) (1.0.0) Keil RTX (4.81.1)
Compiler (1.2.0) -I/O STDERR: ITM (1.2.0) STDIN: ITM (1.2.0) STDOUT: ITM (1.2.0)
Device Startup (1.2.0)
Graphics CORE (5.36.6)
Thanks in advance for your help, Tim