99 lines
2.9 KiB
C
99 lines
2.9 KiB
C
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/*
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* Copyright (C) 2022-2024, Xiaohua Semiconductor Co., Ltd.
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*
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* SPDX-License-Identifier: Apache-2.0
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*
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* Change Logs:
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* Date Author Notes
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* 2023-10-27 CDT first version
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*/
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/*******************************************************************************
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* Include files
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******************************************************************************/
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#include <rtthread.h>
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#include <rtdevice.h>
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#include <board.h>
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#if defined(BSP_RTC_USING_XTAL32) || defined(RT_USING_PM)
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#define XTAL32_FCM_THREAD_STACK_SIZE (1024)
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/**
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* @brief This thread is used to monitor whether XTAL32 is stable.
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* This thread only runs once after the system starts.
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* When stability is detected or 2s times out, the thread will end.
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* (When a timeout occurs it will be prompted via rt_kprintf)
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*/
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void xtal32_fcm_thread_entry(void *parameter)
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{
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stc_fcm_init_t stcFcmInit;
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uint32_t u32TimeOut = 0UL;
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uint32_t u32Time = 200UL; /* 200*10ms = 2s */
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/* FCM config */
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FCG_Fcg0PeriphClockCmd(FCG0_PERIPH_FCM, ENABLE);
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(void)FCM_StructInit(&stcFcmInit);
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stcFcmInit.u32RefClock = FCM_REF_CLK_MRC;
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stcFcmInit.u32RefClockDiv = FCM_REF_CLK_DIV8192; /* ~1ms cycle */
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stcFcmInit.u32RefClockEdge = FCM_REF_CLK_RISING;
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stcFcmInit.u32TargetClock = FCM_TARGET_CLK_XTAL32;
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stcFcmInit.u32TargetClockDiv = FCM_TARGET_CLK_DIV1;
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stcFcmInit.u16LowerLimit = (uint16_t)((XTAL32_VALUE / (MRC_VALUE / 8192U)) * 96UL / 100UL);
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stcFcmInit.u16UpperLimit = (uint16_t)((XTAL32_VALUE / (MRC_VALUE / 8192U)) * 104UL / 100UL);
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(void)FCM_Init(&stcFcmInit);
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/* Enable FCM, to ensure xtal32 stable */
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FCM_Cmd(ENABLE);
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while (1)
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{
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if (SET == FCM_GetStatus(FCM_FLAG_END))
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{
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FCM_ClearStatus(FCM_FLAG_END);
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if ((SET == FCM_GetStatus(FCM_FLAG_ERR)) || (SET == FCM_GetStatus(FCM_FLAG_OVF)))
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{
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FCM_ClearStatus(FCM_FLAG_ERR | FCM_FLAG_OVF);
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}
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else
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{
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(void)FCM_DeInit();
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FCG_Fcg0PeriphClockCmd(FCG0_PERIPH_FCM, DISABLE);
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/* XTAL32 stabled */
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break;
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}
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}
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u32TimeOut++;
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if (u32TimeOut > u32Time)
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{
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(void)FCM_DeInit();
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FCG_Fcg0PeriphClockCmd(FCG0_PERIPH_FCM, DISABLE);
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rt_kprintf("Error: XTAL32 still unstable, timeout.\n");
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break;
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}
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rt_thread_mdelay(10);
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}
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}
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int xtal32_fcm_thread_create(void)
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{
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rt_thread_t tid;
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tid = rt_thread_create("xtal32_fcm", xtal32_fcm_thread_entry, RT_NULL,
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XTAL32_FCM_THREAD_STACK_SIZE, RT_THREAD_PRIORITY_MAX - 2, 10);
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if (tid != RT_NULL)
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{
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rt_thread_startup(tid);
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}
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else
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{
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rt_kprintf("create xtal32_fcm thread err!");
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}
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return RT_EOK;
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}
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INIT_APP_EXPORT(xtal32_fcm_thread_create);
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#endif
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