__weak HAL_StatusTypeDef HAL_InitTick(uint32_t TickPriority)
{
/* Check uwTickFreq for MisraC 2012 (even if uwTickFreq is a enum type that don't take the value zero)*/
if((uint32_t)uwTickFreq == 0UL)
{
return HAL_ERROR;
}
/* Configure the SysTick to have interrupt in 1ms time basis*/
if (HAL_SYSTICK_Config(SystemCoreClock / (1000UL / (uint32_t)uwTickFreq)) > 0U)
{
return HAL_ERROR;
}
/**
* @brief Configures the SysTick clock source.
* @param CLKSource specifies the SysTick clock source.
* This parameter can be one of the following values:
* @ARG SYSTICK_CLKSOURCE_HCLK_DIV8: AHB clock divided by 8 selected as SysTick clock source.
* @arg SYSTICK_CLKSOURCE_HCLK: AHB clock selected as SysTick clock source.
* @retval None
*/
void HAL_SYSTICK_CLKSourceConfig(uint32_t CLKSource)
{
/* Check the parameters */
assert_param(IS_SYSTICK_CLK_SOURCE(CLKSource));
if (CLKSource == SYSTICK_CLKSOURCE_HCLK)
{
SysTick->CTRL |= SYSTICK_CLKSOURCE_HCLK;
}
else
{
SysTick->CTRL &= ~SYSTICK_CLKSOURCE_HCLK;
}
}
我们可以看到 ，配置时钟源也就是设置状态与控制寄存器SysTick->CTRL。
但是这个函数从未被调用。
继续文件搜索这个函数
在stm32h7xx_hal_cortex.c文件中 ，发现了这么一段注释：
You can change the SysTick Clock source to be HCLK_Div8 by calling the macro
HAL_SYSTICK_CLKSourceConfig(SYSTICK_CLKSOURCE_HCLK_DIV8) just after the
HAL_SYSTICK_Config() function call. The HAL_SYSTICK_CLKSourceConfig() macro is defined
inside the stm32h7xx_hal_cortex.h file.
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