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Fix access to the DWT peripheral for STM32 HAL (#12434)

Access to the DWT peripheral for the `CYCCNT` register needs to happen before `main()`. The code needs to be called after the setup of the system clocks, so the right place is between the `premain()` and `main()` function of the STM32 Arduino core.

This patch moves the DWT access code to a new function, which is then placed between `premain()` and `main()`.
Nils Hasenbanck 6 years ago
parent
commit
5a4fd8e0a6
1 changed files with 11 additions and 5 deletions
  1. 11
    5
      Marlin/src/HAL/HAL_STM32/HAL.cpp

+ 11
- 5
Marlin/src/HAL/HAL_STM32/HAL.cpp View File

@@ -78,14 +78,20 @@ uint16_t HAL_adc_result;
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 // Public functions
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 // --------------------------------------------------------------------------
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-// HAL initialization task
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-void HAL_init(void) {
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-  // Needed for DELAY_NS() / DELAY_US() on CORTEX-M7
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-  #if (defined(__arm__) || defined(__thumb__)) && __CORTEX_M == 7
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+// Needed for DELAY_NS() / DELAY_US() on CORTEX-M7
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+#if (defined(__arm__) || defined(__thumb__)) && __CORTEX_M == 7
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+  // HAL pre-initialization task
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+  // Force the preinit function to run between the premain() and main() function
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+  // of the STM32 arduino core
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+  __attribute__((constructor (102)))
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+  void HAL_preinit() {
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     enableCycleCounter();
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-  #endif
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+  }
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+#endif
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+// HAL initialization task
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+void HAL_init(void) {
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   FastIO_init();
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   #if ENABLED(SDSUPPORT)

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