【M0】 MG32F02A 学习笔记⑮ BOD唤醒

ti

   上回我们说到了MG32F02A的EXIC唤醒的使用。
   这次，我们讲一下MG32F02A的BOD功能使用。
   首先，讲一下，BOD是什么，BOD，全程Brown-Out-Detect，俗称低压检测器。功能如其名字，检测低压供电的功能。MG32F02A有两路BOD，其中，BOD0是固死检测1.7V的，而BOD1则是可编程用于检测2.0V/2.4V/3.7V/4.2V。当电压到达这个监测点时，BOD就会发送一个系统事件到CPU中，可用于系统唤醒的功能。
   上一下源码：

#include "MG32x02z_DRV.H"
#include "MG32x02z_ADC_DRV.h"
#include "MG32x02z_PW_DRV.h"
#include
typedef uint8_t u8;
typedef uint16_t u16;
typedef uint32_t u32;
typedef uint64_t u64;
void CSC_Init (void)
{
CSC_PLL_TyprDef CSC_PLL_CFG;
UnProtectModuleReg(MEMprotect); // Setting flash wait state
MEM_SetFlashWaitState(MEM_FWAIT_ONE); // 50MHz> Sysclk >=25MHz
ProtectModuleReg(MEMprotect);
UnProtectModuleReg(CSCprotect);
CSC_CK_APB_Divider_Select(APB_DIV_1); // Modify CK_APB divider APB=CK_MAIN/1
CSC_CK_AHB_Divider_Select(AHB_DIV_1); // Modify CK_AHB divider AHB=APB/1
/* CK_HS selection */
CSC_IHRCO_Select(IHRCO_12MHz); // IHRCO Sel 12MHz
CSC_IHRCO_Cmd(ENABLE);
while(CSC_GetSingleFlagStatus(CSC_IHRCOF) == DRV_Normal);
CSC_ClearFlag(CSC_IHRCOF);
CSC_CK_HS_Select(HS_CK_IHRCO); // CK_HS select IHRCO
/* PLL */
/**********************************************************/
CSC_PLL_CFG.InputDivider=PLLI_DIV_2; // 12M/2=6M
CSC_PLL_CFG.Multiplication=PLLIx16; // 6M*16=96M
CSC_PLL_CFG.OutputDivider=PLLO_DIV_2; // PLLO=96M/2=48M
CSC_PLL_Config(&CSC_PLL_CFG);
CSC_PLL_Cmd(ENABLE);
while(CSC_GetSingleFlagStatus(CSC_PLLF) == DRV_Normal);
CSC_ClearFlag(CSC_PLLF);
/**********************************************************/
/* CK_MAIN */
CSC_CK_MAIN_Select(MAIN_CK_HS);
/* Configure ICKO function */
/* Configure peripheral clock */
CSC_PeriphOnModeClock_Config(CSC_ON_PortA,ENABLE);
CSC_PeriphOnModeClock_Config(CSC_ON_PortE,ENABLE);
ProtectModuleReg(CSCprotect);
}
void EXIC_Init(void)
{
PIN_InitTypeDef PINX_InitStruct;
EXIC_TRGSTypeDef EXIC_TRGS;
//===Set CSC init====
//MG32x02z_CSC_Init.h(Configuration Wizard)
//Select CK_HS source = CK_IHRCO
//Select IHRCO = 11.0592M
//Select CK_MAIN Source = CK_HS
//Configure PLL->Select APB Prescaler = CK_MAIN/1
//Configure Peripheral On Mode Clock->Port A = Enable if EXIC Port is PortA
//====GPIO Initial====
PINX_InitStruct.PINX_Pin = PX_Pin_All; // Select Pin of the port to initial (PX_Pin_All is all pin of the port.)
PINX_InitStruct.PINX_Mode = PINX_Mode_OpenDrain_O; // Select GPIO mode
// 1.QB: Quasi-Bidirection mode only for PC )
PINX_InitStruct.PINX_PUResistant = PINX_PUResistant_Enable; // Select wether enable internal pull-up R or not.
PINX_InitStruct.PINX_Speed = PINX_Speed_Low; // Select wehter enable high speed mode
// 1.(PINX_Speed_High mode only for PC0~3 , PD0~3 )
PINX_InitStruct.PINX_OUTDrive = PINX_OUTDrive_Level0; // Select output drive strength
// 1.(Level 0 & level 3 only for PE0~PE3)
PINX_InitStruct.PINX_FilterDivider = PINX_FilterDivider_Bypass; // Select input filter divider.
PINX_InitStruct.PINX_Inverse = PINX_Inverse_Disable; // Select input signal whether inverse or not.
// 1.PINX_Inverse_Disable = L level or falling edge.
// 2.PINX_Inverse_Enable = H level or Rising edge.
PINX_InitStruct.PINX_Alternate_Function = 0; // Select GPIO mode
GPIO_PortMode_Config(IOMA,&PINX_InitStruct); // (Pin0 & Pin1) of PorA configuration
GPIO_WritePort(GPIOA,0xFFFF); // Initial PortA
//====EXIC Initial====
// EXIC_TRGS.EXIC_Pin = EXIC_TRGS_ALL; // The pin trigger mode select.
EXIC_TRGS.EXIC_Pin = EXIC_TRGS_PIN2 | EXIC_TRGS_PIN3 | EXIC_TRGS_PIN4; // 1. You can selec any pin of the port.
EXIC_TRGS.EXIC_TRGS_Mode = Level; // External interrupt pin edge/level trigger event select.
EXIC_PxTriggerMode_Select(EXIC_PA,&EXIC_TRGS); // EXIC trigger mode configuration.
EXIC_PxTriggerAndMask_Select(EXIC_PA , 0x0003); // EXIC_PA AF trigger event select.
// 1. Select PA_AF trigger pin(PA0, PA1).
// 2. PA_AF is set if trigger event of select pin have to happen at same time(PA0 & PA1).
EXIC_PxTriggerOrMask_Select(EXIC_PA , 0x000C); // EXIC_PA OF trigger event select.
// 1. Select PA_OF trigger pin(PA2, PA3).
// 2. PA_OF is set if anyone trigger event of select pin happen(PA2 | PA3).
EXIC_ClearPxTriggerEventFlag(EXIC_PA, EXIC_PX_AllPIN ); // Clear All pin of the port event flag.
EXIC_PxTriggerITEA_Cmd(EXIC_PA_IT , ENABLE); // Enable EXIC interrupt
NVIC_EnableIRQ(EXINT0_IRQn); //
//===Interrupt handle====
//Please refer to MG32x02z_EXIC_IRQ.c
}
void EXINT0_IRQHandler(void)
{
PE14=~PE14;
EXIC_ClearPxTriggerEventFlag(EXIC_PA, EXIC_PX_AllPIN );
EXIC_ClearPxTriggerITFlag(EXIC_PA_ITF,EXIC_PX_OF);
}
void PW_Init()
{
UnProtectModuleReg(PWprotect);
NVIC_EnableIRQ(SYS_IRQn);
PW_StopModeLDO_Select(PW_LowPower_LDO);
PW_OnModeLDO_Select(PW_Normal_LDO);
PW_BOD1Threshold_Select (PW_BOD1_3V7); //detecting voltage
PW_BOD1Trigger_Select(PW_BOD1_FallingEdge);
PW_BOD1_Cmd(ENABLE);
PW_IntVoltageRef(ENABLE);
PW_PeriphStopModeContinuous_Config(PW_STPPO_BOD1, ENABLE);
PW_PeriphStopModeWakeUp_Config(PW_WKSTP_BOD1, ENABLE);
PW_IT_Config((PW_INT_WK | PW_INT_BOD1), ENABLE);
PW_ClearFlag(PW_BOD1F);
PW_ITEA_Cmd(ENABLE);
ProtectModuleReg(PWprotect);
}
void SYS_IRQHandler(void)
{
if(PW_GetSingleFlagStatus(PW_BOD1F) == DRV_Happened)
{
PE13=~PE13;
PW_ClearFlag(PW_BOD1F);
}
}
int main()
{
int i,j;
PIN_InitTypeDef PINX_InitStruct;
CSC_Init();
EXIC_Init();
PW_Init();
PINX_InitStruct.PINX_Mode = PINX_Mode_PushPull_O; // Pin select digital input mode
PINX_InitStruct.PINX_PUResistant = PINX_PUResistant_Enable; // Enable pull up resistor
PINX_InitStruct.PINX_Speed = PINX_Speed_Low;
PINX_InitStruct.PINX_OUTDrive = PINX_OUTDrive_Level0; // Pin output driver full strength.
PINX_InitStruct.PINX_FilterDivider = PINX_FilterDivider_Bypass;// Pin input deglitch filter clock divider bypass
PINX_InitStruct.PINX_Inverse = PINX_Inverse_Disable; // Pin input data not inverse
PINX_InitStruct.PINX_Alternate_Function = 0; // Pin AFS = 0
GPIO_PinMode_Config(PINE(13),&PINX_InitStruct); // D6 setup at PE15
GPIO_PinMode_Config(PINE(14),&PINX_InitStruct); // D6 setup at PE15
GPIO_PinMode_Config(PINE(15),&PINX_InitStruct); // D6 setup at PE15
i=0;
j=0;
while(1)
{
i++;
if(i>=500000){
i=0;
PE15=~PE15;
j++;
if(j>10)
{
PE15=1;
SCB->SCR = (SCB_SCR_SLEEPDEEP_Msk); //into stop
__WFI(); //This is the command of cmsis_ARM.cc. __WFI();is wait for interrupt while __WFE();is wait for event();
j=0;
}
}
}
}

在配置中，我设置为下降沿触发，也就是说，是从高于3.7V到低于3.7V的过程中才会触发，而反过来，不会触发。

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【M0】 MG32F02A 学习笔记⑮ BOD唤醒

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