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2026-08-16 13:13:45 +02:00 · 2022-08-06 13:35:32 +08:00
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+/**
+  **************************************************************************
+  * @file     at32f403a_407_clock.c
+  * @version  v2.0.9
+  * @date     2022-04-25
+  * @brief    system clock config program
+  **************************************************************************
+  *                       Copyright notice & Disclaimer
+  *
+  * The software Board Support Package (BSP) that is made available to
+  * download from Artery official website is the copyrighted work of Artery.
+  * Artery authorizes customers to use, copy, and distribute the BSP
+  * software and its related documentation for the purpose of design and
+  * development in conjunction with Artery microcontrollers. Use of the
+  * software is governed by this copyright notice and the following disclaimer.
+  *
+  * THIS SOFTWARE IS PROVIDED ON "AS IS" BASIS WITHOUT WARRANTIES,
+  * GUARANTEES OR REPRESENTATIONS OF ANY KIND. ARTERY EXPRESSLY DISCLAIMS,
+  * TO THE FULLEST EXTENT PERMITTED BY LAW, ALL EXPRESS, IMPLIED OR
+  * STATUTORY OR OTHER WARRANTIES, GUARANTEES OR REPRESENTATIONS,
+  * INCLUDING BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY,
+  * FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT.
+  *
+  **************************************************************************
+  */
+
+/* includes ------------------------------------------------------------------*/
+#include "at32f403a_407_clock.h"
+
+/** @addtogroup AT32F403A_periph_template
+  * @{
+  */
+
+/** @addtogroup 403A_System_clock_configuration System_clock_configuration
+  * @{
+  */
+
+/**
+  * @brief  system clock config program
+  * @note   the system clock is configured as follow:
+  *         - system clock        = hext / 2 * pll_mult
+  *         - system clock source = pll (hext)
+  *         - hext                = 8000000
+  *         - sclk                = 240000000
+  *         - ahbdiv              = 1
+  *         - ahbclk              = 240000000
+  *         - apb2div             = 2
+  *         - apb2clk             = 120000000
+  *         - apb1div             = 2
+  *         - apb1clk             = 120000000
+  *         - pll_mult            = 60
+  *         - pll_range           = GT72MHZ (greater than 72 mhz)
+  * @param  none
+  * @retval none
+  */
+void system_clock_config(void)
+{
+  /* reset crm */
+  crm_reset();
+
+  crm_clock_source_enable(CRM_CLOCK_SOURCE_HEXT, TRUE);
+
+   /* wait till hext is ready */
+  while(crm_hext_stable_wait() == ERROR)
+  {
+  }
+
+  /* config pll clock resource */
+  crm_pll_config(CRM_PLL_SOURCE_HEXT_DIV, CRM_PLL_MULT_60, CRM_PLL_OUTPUT_RANGE_GT72MHZ);
+
+  /* config hext division */
+  crm_hext_clock_div_set(CRM_HEXT_DIV_2);
+
+  /* enable pll */
+  crm_clock_source_enable(CRM_CLOCK_SOURCE_PLL, TRUE);
+
+  /* wait till pll is ready */
+  while(crm_flag_get(CRM_PLL_STABLE_FLAG) != SET)
+  {
+  }
+
+  /* config ahbclk */
+  crm_ahb_div_set(CRM_AHB_DIV_1);
+
+  /* config apb2clk */
+  crm_apb2_div_set(CRM_APB2_DIV_2);
+
+  /* config apb1clk */
+  crm_apb1_div_set(CRM_APB1_DIV_2);
+
+  /* enable auto step mode */
+  crm_auto_step_mode_enable(TRUE);
+
+  /* select pll as system clock source */
+  crm_sysclk_switch(CRM_SCLK_PLL);
+
+  /* wait till pll is used as system clock source */
+  while(crm_sysclk_switch_status_get() != CRM_SCLK_PLL)
+  {
+  }
+
+  /* disable auto step mode */
+  crm_auto_step_mode_enable(FALSE);
+
+  /* update system_core_clock global variable */
+  system_core_clock_update();
+}
+
+/**
+  * @}
+  */
+
+/**
+  * @}
+  */
+