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51 lines
2.0 KiB
Plaintext
51 lines
2.0 KiB
Plaintext
About this Example
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==================
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This directory contains the "Dining Philosophers Problem" (DPP) example
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for CMSIS-RTOS RTX application running on the STM32 NUCLEO-L152RE board
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(ARM Cortex-M3). This directory contains portable code that should
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compile with any C compiler for ARM Cortex-M.
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The sub-directories contain code and project files, which are specific to
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the particular ARM toolchains, such as ARM (MDK-ARM) and IAR.
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Please refer to the README files in the sub-directories for specific
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instructions how to use and customize the example to your needs.
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Support Code for NUCLEO-L152RE Board
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====================================
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The directory qpc\3rd_party\nucleo-l152re contains the CMSIS-compliant
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device code for the STM32L152xx MCUs (ARM Cortex-M3). Please see the
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README.txt file in this folder for more details.
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Note About the Clock Speed
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--------------------------
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With the default setting of 8MHz external clock (HSE_VALUE=8000000),
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the SystemCoreClockUpdate() routine in system_stm32l1xx.c sets the
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SystemCoreClock variable to 32000000 (32MHz). However, the NUCLEO-L152RE
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board appears to run actually only at 16MHz. As a quick fix, the
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DPP project directory set the HSE_VALUE to only 4MHz (HSE_VALUE=4000000)
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in the command-line options to the compiler, to match the reporeted
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SystemCoreClock to the actual speed of the clock (16MHz). At this point
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it is not clear why the CPU clock is set to only half of the expected
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speed.
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QS Software Tracing Instrumentation
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===================================
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This example provides the "Spy" build configuration, which outputs the QS
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(Quantum Spy) software tracing data through UART2, which is connected to
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the virtual COM port of the ST-Link debugger.
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The output is generated at 115200 baud rate.
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Here is an example invocation of the QSPY host application to receive
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the QS data from NUCLEO-L152RE:
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qspy -cCOM20
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The actual COM port number might be different on your Windows machine.
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Please check the Device Manager to find the COM port number.
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