我在仿真调试的时候，程序进入VLPS后，LPTMR定时器设定10秒中断，定时器中断可以从VLPS到VLPR的正常唤醒。但是不仿真的时候，关电重新上电，程序从RUN进入VLPR，然后程序进入VLPS后，之后无法进入LPTMR定时器中断，也无法唤醒到VLPR模式，一直处在VLPS状态。
但是外部IO口中断从VLPS到VLPR可以正常唤醒，不管是在仿真模式还是不仿真的情况都可以从VLPS正常唤醒到VLPR。
难道不仿真的时候VLPS导致LPTMR定时器时钟关了，还是有其他的问题？
VLPR用的慢速时钟源8M，分频后慢系统时钟为4M，FLASH时钟为1M，LPTMR定时器时钟源用的慢系统时钟4M分4096分频，10000计数大约10s中断一次。
问题已经解决，要提前设置使能VLPS模式下SIRC时钟，默认是关闭的，程序中增加一句宏定义就可以了
#define SCG_ENABLE_SIRC_IN_VLPS 1
这是我的源代码。不管是仿真还是断开下载器，在VLPR模式下LPTMR都正常工作。但是就是在VLPS模式下LPTMR无法唤醒到VLPR模式。用外部IO中断唤醒都正常。但是下载仿真时在VLPS模式LPTMR又可以唤醒到VLPR模式。我的初始化时钟就在Run_to_VLPR(void)函数中的scg_vlpr_configuration()函数中。
#include "include.h"
/* 中断优先级组 */
#define NVIC_Group0 0x07
#define NVIC_Group1 0x06
#define NVIC_Group2 0x05
#define NVIC_Group3 0x04
#define NVIC_Group4 0x03
typedef enum _mode {
eRun = 1,
eStop = 2,
eVLPR = 4,
eVLPS = 16,
eHSRun = 128
}eLowPowerMode;
void delay(uint32_t cycles)
{
/* Delay function - do nothing for a number of cycles */
while(cycles--)
{
__asm("nop");
}
}
void error_trap (void)
{
while (1)
{
}
}
void disable_clock_monitors(void)
{
/* Disable Clock monitor for System Oscillator */
SCG->SOSCCSR &= ~(SCG_SOSCCSR_SOSCCM_MASK);
/* Disable Clock monitor for System PLL */
SCG->SPLLCSR &= ~(SCG_SPLLCSR_SPLLCM_MASK);
}
void scg_vlps_configuration (void)
{
uint32_t tempSIRC = SCG->SIRCCSR;
/* Disable in VLPS */
tempSIRC &= ~(SCG_SIRCCSR_SIRCLPEN_MASK |
SCG_SIRCCSR_SIRCSTEN_MASK);
#if SCG_ENABLE_SIRC_IN_VLPS
/* Enable in VLPS */
tempSIRC |= SCG_SIRCCSR_SIRCLPEN_MASK |
SCG_SIRCCSR_SIRCSTEN_MASK;
#endif
SCG->SIRCCSR = tempSIRC;
}
void scg_vlpr_configuration(void)
{
uint8_t tempRCM = RCM->SRIE;
uint32_t temp;
/* Check if core is not using SIRC */
if ((SCG->CSR & SCG_CSR_SCS_MASK) != SCG_CSR_SCS(2))
{
/* Disable SIRC */
SCG->SIRCCSR &= ~SCG_SIRCCSR_SIRCEN_MASK;
/* Wait until SIRC is disabled */
while (SCG->SIRCCSR & SCG_SIRCCSR_SIRCVLD_MASK) {}
/* Enable SIRC in VLP modes */
SCG->SIRCCSR = SCG_SIRCCSR_SIRCSTEN_MASK
#if SCG_ENABLE_SIRC_IN_VLPS
| SCG_SIRCCSR_SIRCLPEN_MASK
#endif
;
/* Enable SIRC */
SCG->SIRCCSR |= SCG_SIRCCSR_SIRCEN_MASK;
/* Wait until SIRC is enabled */
while (0 == (SCG->SIRCCSR & SCG_SIRCCSR_SIRCVLD_MASK)) {}
temp = SCG_RCCR_DIVCORE(1) | /* Core clock is SIRC/8 = 4MHz */
SCG_RCCR_DIVBUS(0) | /* Bus clock is Core clock / 1 = 4MHz */
SCG_RCCR_DIVSLOW(3) | /* Flash clock is Core clock / 1 = 1MHz */
SCG_RCCR_SCS(2); /* Select SIRC as system clock */
SCG->RCCR = temp; /* Select SIRC as system clock */
/* Wait until SIRC is used as system clock */
while ((SCG->CSR & SCG_CSR_SCS_MASK) != SCG_CSR_SCS(2)) {}
/* Configure SIRC as system clock in VLPR modes */
SCG->VCCR = SCG_VCCR_DIVCORE(1) | /* Core clock is SIRC/8 = 1MHz */
SCG_VCCR_DIVBUS(0) | /* Bus clock is Core clock / 1 = 1MHz */
SCG_VCCR_DIVSLOW(3) | /* Flash clock is Core clock / 1 = 1MHz */
SCG_VCCR_SCS(2); /* Select SIRC as system clock */
/* Disable FIRC and SPLL */
/* ?Configurable SIRC as system clock */
/* ?Configure all reset sources to be 'Reset' (not as Interrupt) via RCM_SRIE */
/* ?Program each reset source as interrupt via RCM_SRIE for a minimum delay time of 10 LPO */
RCM->SRIE &= 0;
/* ?Disable FIRC */
SCG->FIRCCSR = SCG_FIRCCSR_FIRCREGOFF_MASK;
/* ?Execute few nops to ensure an interval of 45 ns */
delay(10);
while (0 != (SCG->FIRCCSR & SCG_FIRCCSR_FIRCVLD_MASK)) { };
/* ?Configure every reset source back to original intended reset configuration (Interrupt or Reset) via RCM_SRIE */
RCM->SRIE = tempRCM;
/* Set SIRCDIV2 value to 1MHz (SIRC / Hi@yankui666
MCU在进入低功耗的时候要断开调试器，否则MCU可能并不会成功进入低功耗模式
1.我没看到你初始化时钟的示例代码
2.请先初始化完成时钟，外设后再去执行RUN_TO_VLPR
3.先调通RUN模式下LPTMR再去排查