本帖最后由 Sam131208 于 2025-2-13 16:42 编辑
初始化时，时钟设置为PLL32M， 时钟源为irc16m. 进入了深度睡眠1后唤醒，频率变为了16mhz. 是否还需要其它设置才可以维持PLL设定？
测试方法为：设定timer1定时反转PA10， 深度睡眠1唤醒后， 按键控制timer1输出， 输出脉宽变宽一倍。
下面是PLL程序：
static void switch_system_clock_to_32m_irc16m(void)
{
uint32_t timeout = 0U;
uint32_t stab_flag = 0U;
/* select IRC16M as system clock source, deinitialize the RCU */
rcu_system_clock_source_config(RCU_CKSYSSRC_IRC16M);
rcu_deinit();
/* enable IRC16M */
RCU_CTL |= RCU_CTL_IRC16MEN;
/* wait until IRC16M is stable or the startup time is longer than IRC16M_STARTUP_TIMEOUT */
do {
timeout++;
stab_flag = (RCU_CTL & RCU_CTL_IRC16MSTB);
} while((0U == stab_flag) && (IRC16M_STARTUP_TIMEOUT != timeout));
/* if fail */
if(0U == (RCU_CTL & RCU_CTL_IRC16MSTB)) {
while(1) {
}
}
/* set the wait state counter value */
FMC_WS = (FMC_WS & (~FMC_WS_WSCNT)) | FMC_WAIT_STATE_0;
/* AHB = SYSCLK */
RCU_CFG0 |= RCU_AHB_CKSYS_DIV1;
/* APB2 = AHB */
RCU_CFG0 |= RCU_APB2_CKAHB_DIV1;
/* APB1 = AHB/2 */
RCU_CFG0 |= RCU_APB1_CKAHB_DIV1;
/* PLL = (IRC16M/2) * 4 = 32 MHz */
RCU_CFG1 &= ~(RCU_CFG1_PREDV);
RCU_CFG1 |= RCU_PLL_PREDV2;
RCU_CFG0 &= ~(RCU_CFG0_PLLSEL | RCU_CFG0_PLLMF);
RCU_CFG0 |= (RCU_PLLSRC_IRC16M | RCU_PLL_MUL4);
/* enable PLL */
RCU_CTL |= RCU_CTL_PLLEN;
/* wait until PLL is stable */
while(0U == (RCU_CTL & RCU_CTL_PLLSTB)) {
}
/* select PLL as system clock */
RCU_CFG0 &= ~RCU_CFG0_SCS;
RCU_CFG0 |= RCU_CKSYSSRC_PLL;
/* wait until PLL is selected as system clock */
while(0U == (RCU_CFG0 & RCU_SCSS_PLL)) {
}
}
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