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

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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()`.
This commit is contained in:
Nils Hasenbanck 2018-11-18 08:30:46 +01:00 committed by Scott Lahteine
parent 7f225b9421
commit 5a4fd8e0a6
1 changed files with 12 additions and 6 deletions
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18
Marlin/src/HAL/HAL_STM32/HAL.cpp
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@ -78,14 +78,20 @@ uint16_t HAL_adc_result;
// Public functions
// --------------------------------------------------------------------------
// Needed for DELAY_NS() / DELAY_US() on CORTEX-M7
#if (defined(__arm__) || defined(__thumb__)) && __CORTEX_M == 7
// HAL pre-initialization task
// Force the preinit function to run between the premain() and main() function
// of the STM32 arduino core
__attribute__((constructor (102)))
void HAL_preinit() {
enableCycleCounter();
}
#endif
// HAL initialization task
void HAL_init(void) {
// Needed for DELAY_NS() / DELAY_US() on CORTEX-M7
#if (defined(__arm__) || defined(__thumb__)) && __CORTEX_M == 7
enableCycleCounter();
#endif
FastIO_init();
#if ENABLED(SDSUPPORT)