【经验分享】STM32L0 进入STOP模式后串口中断方式唤醒

STMCU小助手 · 2021-11-15T17:02:54+00:00

实现方法: 2 f7 ~- A! v' l- B, i% {& e8 V1 Q# L6 k7 J$ K' _% y 1、定时休眠唤醒code 4 Q4 t% o8 ^( {' d$ i; n0 V `HAL_Delay(2000);//进行采样的时间, P" A- Y9 L8 a8 w8 S) h8 { HAL_RTCEx_DeactivateWakeUpTimer(&RTCHandle); 6 O) n& C: Y9 m5 j6 i T7 h$ UHAL_RTCEx_SetWakeUpTimer_IT(&RTCHandle, 2, RTC_WAKEUPCLOCK_RTCCLK_DIV16);9 S$ r) v& N! t, i [ HAL_PWR_EnterSTOPMode(PWR_LOWPOWERREGULATOR_ON, PWR_STOPENTRY_WFI);//调用库函数进入STOP模式 : }! F* U6 p! f. O- s. c0 NSystemClockConfig_STOP();//停机模式后唤醒，恢复时钟源 & q6 z. e, c1 z" m1 r# x& rcount1++;9 E, U; d, |9 z/ L1 F- ]1 a while(count1==1)//循环的次数 " d# Y- _+ S5 e0 S6 B0 H{- C) P' T, M" M* t \ Rx_Init();: M- U; }+ j- ]. x7 @# j count1=0; 8 q# s8 l7 T/ G% |, J+ \( fflag3=0;# o3 b; ]1 X; w1 I2 Q- |# _$ q __HAL_RTC_ALARM_DISABLE_IT(&RTCHandle, RTC_IT_ALRA);% [, L8 D: _0 [6 h, I( e5 m, d1 _ __HAL_RTC_ALARM_CLEAR_FLAG(&RTCHandle, RTC_IT_ALRA);4 d& W7 J+ K2 S; E# } HAL_TIM_Base_Stop(&TimHandle); //定时器停止; M' l9 C7 |8 v( e7 E. g HAL_RTCEx_DeactivateWakeUpTimer(&RTCHandle); 5 x* C# f9 P0 Y; ZHAL_PWR_EnterSTOPMode(PWR_LOWPOWERREGULATOR_ON, PWR_STOPENTRY_WFI);//调用库函数进入STOP模式/ ~# {' j1 c9 s' v } 5 m* x7 i( f6 A6 B2 O6 Z' u计算方法：例如休眠4s . Y3 d/ R. {4 r% H7 x/ F/* RTC Wakeup Interrupt Generation: ' W$ V" e2 p& y2 O) gWakeup Time Base = (RTC_WAKEUPCLOCK_RTCCLK_DIV /(LSE or LSI)) " _# ^( o6 e2 G% BWakeup Time = Wakeup Time Base * WakeUpCounter6 S) l$ [* y2 h/ a% D5 G! r9 j6 J = (RTC_WAKEUPCLOCK_RTCCLK_DIV /(LSE or LSI)) * WakeUpCounter 6 s9 m% O: l" Q6 g==> WakeUpCounter = Wakeup Time / Wakeup Time BaseTo configure the wake up timer to 4s the WakeUpCounter is set to 0x1FFF: ) H8 Z3 L- P- E! sRTC_WAKEUPCLOCK_RTCCLK_DIV = RTCCLK_Div16 = 16 # j* s: l* {* w6 rWakeup Time Base = 16 /(~39.000KHz) = ~0,410 ms 7 z0 Z5 s1 M) t* XWakeup Time = ~4s = 0,410ms * WakeUpCounter% N1 i3 e2 k* \$ q9 h ==> WakeUpCounter = ~4s/0,410ms = 9750 = 0x2616 */ $ ], H' s3 o! K7 ~1 r2 V0 AHAL_RTCEx_SetWakeUpTimer_IT(&RTCHandle, 0x2616, RTC_WAKEUPCLOCK_RTCCLK_DIV16);复制代码 , w. [8 v; l. k- s# R: C. _% ]局限性：用内部时钟LSI，大小固定导致Wakeup Time Base 被限制。 Wakeup Time（最大）=0.41ms*65535（0xffff）=26.869s，可能达不到休眠时间要求。 . n2 b; J5 ^6 }* y+ I+ B 8 D) T% @$ ^0 m. b1 q P$ I8 A另一种方法：改HAL_RTCEx_SetWakeUpTimer_IT(&RTCHandle, 2, RTC_WAKEUPCLOCK_CK_SPRE_16BITS); ) C( R# x4 u( u- Z0 v3 R 7 R# r5 H7 q. k3 B& S( h) Z# S这里RTC_WAKEUPCLOCK_CK_SPRE_16BITS是设置CR寄存器中的低三位，唤醒时钟选择，这里选择1hz，2表示工作2S后进入唤醒中断，这个数随便改，改成多少就是休眠多少时间。 ) A. B' ~7 ?# [: Q& S0 _" q- [5 R3 V1 s: W 3 f# b, ^7 d4 k1 X2、串口中断唤醒 " _" E' X! x9 c' l2 d! @7 ]1 u5 I1 M) H8 u" } 唤醒机制：在MCU进入STOP状态后，不能直接通过UART等外设唤醒，在MCU进入STOP前将RX脚设为EXTI模式，并使能对应的中断。唤醒后重新初始化串口、配置时钟。（这里贴两份代码，一份是我参考的百战天虫的code，另一份我自己的）; [' G) h2 I1 f- G1 T3 j6 M% T , J; Y% S7 @- y$ gby：百战天虫 3 B& V7 t( A" A9 B8 {void Rx_Init()4 q9 ?0 Z# [2 M% Q. C- e8 d. A y! M {$ B8 E. Q- m! Z7 G4 n6 C3 `: |9 ? GPIO_InitTypeDef GPIO_InitStruct; 2 E% S; o' ~4 _6 J1 U3 @( k__HAL_RCC_GPIOA_CLK_ENABLE(); , `3 }* Y1 N; S& U" U // 配置UART1的Rx引脚为EXIT模式 : r5 I' w( G7 O/ H0 v# D* } GPIO_InitStruct.Pin = USARTx_RX_PIN;" B, l I1 Z8 u# _8 \! [1 f GPIO_InitStruct.Mode = GPIO_MODE_IT_FALLING; // 特别注意这里要使用中断模式 % V2 d- n! Y, T5 r GPIO_InitStruct.Pull = GPIO_PULLUP;4 O$ h: R1 G0 G4 g) E8 k' h HAL_GPIO_Init(USARTx_TX_GPIO_PORT, &GPIO_InitStruct);# M/ y- G: t; s9 ? HAL_NVIC_SetPriority(EXTI4_15_IRQn, 2, 0);7 W4 ~ N- h5 R. t ^& _ HAL_NVIC_EnableIRQ(EXTI4_15_IRQn); ' A7 T+ H8 z' V0 f}3 d$ M" J7 q4 m2 P void HAL_GPIO_EXTI_Callback(uint16_t GPIO_Pin)5 x2 b0 t" e0 p# t! S { L$ k+ m+ |. ` oif(GPIO_Pin==USARTx_RX_PIN) j) z" z, a9 o# |; e { + O- M; I4 J1 Y$ G w; S' E// HAL_NVIC_EnableIRQ(SysTick_IRQn); % c- y+ U) P4 e3 ]% g6 aSystemClockConfig_STOP();//停机模式后唤醒，恢复时钟源' L' w) P* r o1 l0 p HAL_Init();; ~) }# b7 t+ Z8 j% m SystemClock_Config(); % r$ C! `5 t0 t3 }4 I# g+ GSystemPower_Config(); 0 F% V/ p: K) bHAL_SPI_DeInit(&hspi1); A5 k- f' T4 p. @7 X6 E& E( D HAL_GPIO_DeInit(GPIOA,GPIO_PIN_10);//串口重新初始化时HAL_UART_Init()函数会判断if(huart->State == HAL_UART_STATE_RESET),此时才会执行HAL_UART_MspInit(huart),配置串口IO口，这句话必须有！: e& \' s* f( X2 {/ S5 d' e, K: x __HAL_RCC_GPIOA_CLK_ENABLE(); $ b, Y0 r) b' j- l) F__HAL_RCC_GPIOA_CLK_ENABLE();& e2 y4 }2 s1 W' i __HAL_RCC_GPIOB_CLK_ENABLE(); ' R4 T( v8 p' g- H0 O( vSPI_GPIO_Init();+ o% {( Y; s# u9 f$ y+ W3 P UartHandle.Instance = USARTx; " L, I* R" {2 L6 D% b! O; \UartHandle.Init.BaudRate = uart_baud; * s6 ]+ |" y) j2 ^5 ?" dUartHandle.Init.WordLength = UART_WORDLENGTH_8B; ], Y' J1 D1 vUartHandle.Init.StopBits = UART_STOPBITS_1;% g. ?( ?5 R6 z UartHandle.Init.Parity = UART_PARITY_NONE;6 k0 Y8 d2 D. R) W UartHandle.Init.HwFlowCtl = UART_HWCONTROL_NONE; 2 B2 R) V4 G( p6 Q, ?* }, vUartHandle.Init.Mode = UART_MODE_TX_RX; 0 H) _2 U: b" o/ l, i) qGPIO_InitTypeDef GPIO_InitStruct; * ~8 D$ j X* ^# r4 C7 B; n8 z/*##-1- Enable peripherals and GPIO Clocks #################################*/+ F$ _# x' J; I/ C2 I /* Enable GPIO TX/RX clock */- Q4 s, }& z) l2 { USARTx_TX_GPIO_CLK_ENABLE();& _+ Y0 ~* ~, z USARTx_RX_GPIO_CLK_ENABLE(); + s7 f) q0 X: s2 w/ W/ [& @& V' X! i/* Enable USART2 clock */ b r7 t" l- r u2 {USARTx_CLK_ENABLE();& ^, z& ]0 Q! ~3 e: m /*##-2- Configure peripheral GPIO ##########################################*/) K+ @, L) S2 X- H0 O$ |* m /* UART TX GPIO pin configuration */ 2 ^0 |/ u$ y; Z$ I- PGPIO_InitStruct.Pin = USARTx_TX_PIN;8 c! j- T- D$ g) G GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;8 x: v- W, y4 h/ @ GPIO_InitStruct.Pull = GPIO_NOPULL;, e$ f I' T5 l7 o; a3 _! T* ?- m GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH ; 2 c8 D. U9 O- k6 cGPIO_InitStruct.Alternate = USARTx_TX_AF; . ^& d6 i1 u* W+ [HAL_GPIO_Init(USARTx_TX_GPIO_PORT, &GPIO_InitStruct); & K! n* M/ C5 H; Z( r/* UART RX GPIO pin configuration */8 S* w- m' M1 a; Y GPIO_InitStruct.Pin = USARTx_RX_PIN;8 K; B2 m: q2 a/ _8 n- F GPIO_InitStruct.Alternate = USARTx_RX_AF;8 w/ X w e5 Z9 \* W$ K+ W HAL_GPIO_Init(USARTx_RX_GPIO_PORT, &GPIO_InitStruct); 7 J4 J9 j: A/ A; m. qHAL_NVIC_DisableIRQ(EXTI4_15_IRQn); ! ]( y+ d( x9 A0 N__HAL_GPIO_EXTI_CLEAR_IT(USARTx_RX_PIN);4 [6 g- e5 L5 S3 S* Q HAL_NVIC_SetPriority(USARTx_IRQn, 4, 0);9 d& r# L) t3 u( a HAL_NVIC_EnableIRQ(USARTx_IRQn);8 J3 [* i* A; C& U! t/ J( R }) i6 J/ d7 I. F* N1 e' g, U, k }复制代码! r+ A7 t0 P; ~8 t) ^8 V% N 结束！8 j" a- I& I% u+ \ + m; C; M; C" m$ r) O; w ; w& @3 z' Y0 @7 ?( H. J* z

【经验分享】STM32L0 进入STOP模式后串口中断方式唤醒

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STMCU小助手发布时间：2021-11-16 01:02

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文章简介:	STM32L0 进入STOP模式后串口中断方式唤醒

实现方法:

1、定时休眠唤醒code

HAL_Delay(2000);//进行采样的时间, P" A- Y9 L8 a8 w8 S) h8 {
HAL_RTCEx_DeactivateWakeUpTimer(&RTCHandle);
6 O) n& C: Y9 m5 j6 i T7 h$ U
HAL_RTCEx_SetWakeUpTimer_IT(&RTCHandle, 2, RTC_WAKEUPCLOCK_RTCCLK_DIV16);9 S$ r) v& N! t, i [
HAL_PWR_EnterSTOPMode(PWR_LOWPOWERREGULATOR_ON, PWR_STOPENTRY_WFI);//调用库函数进入STOP模式
: }! F* U6 p! f. O- s. c0 N
SystemClockConfig_STOP();//停机模式后唤醒，恢复时钟源
& q6 z. e, c1 z" m1 r# x& r
count1++;9 E, U; d, |9 z/ L1 F- ]1 a
while(count1==1)//循环的次数
" d# Y- _+ S5 e0 S6 B0 H
{- C) P' T, M" M* t \
Rx_Init();: M- U; }+ j- ]. x7 @# j
count1=0;
8 q# s8 l7 T/ G% |, J+ \( f
flag3=0;# o3 b; ]1 X; w1 I2 Q- |# _$ q
__HAL_RTC_ALARM_DISABLE_IT(&RTCHandle, RTC_IT_ALRA);% [, L8 D: _0 [6 h, I( e5 m, d1 _
__HAL_RTC_ALARM_CLEAR_FLAG(&RTCHandle, RTC_IT_ALRA);4 d& W7 J+ K2 S; E# }
HAL_TIM_Base_Stop(&TimHandle); //定时器停止; M' l9 C7 |8 v( e7 E. g
HAL_RTCEx_DeactivateWakeUpTimer(&RTCHandle);
5 x* C# f9 P0 Y; Z
HAL_PWR_EnterSTOPMode(PWR_LOWPOWERREGULATOR_ON, PWR_STOPENTRY_WFI);//调用库函数进入STOP模式/ ~# {' j1 c9 s' v
}
5 m* x7 i( f6 A6 B2 O6 Z' u
计算方法：例如休眠4s
. Y3 d/ R. {4 r% H7 x/ F
/* RTC Wakeup Interrupt Generation:
' W$ V" e2 p& y2 O) g
Wakeup Time Base = (RTC_WAKEUPCLOCK_RTCCLK_DIV /(LSE or LSI))
" _# ^( o6 e2 G% B
Wakeup Time = Wakeup Time Base * WakeUpCounter6 S) l$ [* y2 h/ a% D5 G! r9 j6 J
= (RTC_WAKEUPCLOCK_RTCCLK_DIV /(LSE or LSI)) * WakeUpCounter
6 s9 m% O: l" Q6 g
==> WakeUpCounter = Wakeup Time / Wakeup Time BaseTo configure the wake up timer to 4s the WakeUpCounter is set to 0x1FFF:
) H8 Z3 L- P- E! s
RTC_WAKEUPCLOCK_RTCCLK_DIV = RTCCLK_Div16 = 16
# j* s: l* {* w6 r
Wakeup Time Base = 16 /(~39.000KHz) = ~0,410 ms
7 z0 Z5 s1 M) t* X
Wakeup Time = ~4s = 0,410ms * WakeUpCounter% N1 i3 e2 k* \$ q9 h
==> WakeUpCounter = ~4s/0,410ms = 9750 = 0x2616 */
$ ], H' s3 o! K7 ~1 r2 V0 A
HAL_RTCEx_SetWakeUpTimer_IT(&RTCHandle, 0x2616, RTC_WAKEUPCLOCK_RTCCLK_DIV16);

复制代码

局限性：用内部时钟LSI，大小固定导致Wakeup Time Base 被限制。 Wakeup Time（最大）=0.41ms*65535（0xffff）=26.869s，可能达不到休眠时间要求。

另一种方法：改HAL_RTCEx_SetWakeUpTimer_IT(&RTCHandle, 2, RTC_WAKEUPCLOCK_CK_SPRE_16BITS);

这里RTC_WAKEUPCLOCK_CK_SPRE_16BITS是设置CR寄存器中的低三位，唤醒时钟选择，这里选择1hz，2表示工作2S后进入唤醒中断，这个数随便改，改成多少就是休眠多少时间。

2、串口中断唤醒

唤醒机制：在MCU进入STOP状态后，不能直接通过UART等外设唤醒，在MCU进入STOP前将RX脚设为EXTI模式，并使能对应的中断。唤醒后重新初始化串口、配置时钟。（这里贴两份代码，一份是我参考的百战天虫的code，另一份我自己的）

by：百战天虫

void Rx_Init()4 q9 ?0 Z# [2 M% Q. C- e8 d. A y! M
{$ B8 E. Q- m! Z7 G4 n6 C3 `: |9 ?
GPIO_InitTypeDef GPIO_InitStruct;
2 E% S; o' ~4 _6 J1 U3 @( k
__HAL_RCC_GPIOA_CLK_ENABLE();
, `3 }* Y1 N; S& U" U
// 配置UART1的Rx引脚为EXIT模式
: r5 I' w( G7 O/ H0 v# D* }
GPIO_InitStruct.Pin = USARTx_RX_PIN;" B, l I1 Z8 u# _8 \! [1 f
GPIO_InitStruct.Mode = GPIO_MODE_IT_FALLING; // 特别注意这里要使用中断模式
% V2 d- n! Y, T5 r
GPIO_InitStruct.Pull = GPIO_PULLUP;4 O$ h: R1 G0 G4 g) E8 k' h
HAL_GPIO_Init(USARTx_TX_GPIO_PORT, &GPIO_InitStruct);# M/ y- G: t; s9 ?
HAL_NVIC_SetPriority(EXTI4_15_IRQn, 2, 0);7 W4 ~ N- h5 R. t ^& _
HAL_NVIC_EnableIRQ(EXTI4_15_IRQn);
' A7 T+ H8 z' V0 f
}3 d$ M" J7 q4 m2 P
void HAL_GPIO_EXTI_Callback(uint16_t GPIO_Pin)5 x2 b0 t" e0 p# t! S
{
L$ k+ m+ |. ` o
if(GPIO_Pin==USARTx_RX_PIN) j) z" z, a9 o# |; e
{
+ O- M; I4 J1 Y$ G w; S' E
// HAL_NVIC_EnableIRQ(SysTick_IRQn);
% c- y+ U) P4 e3 ]% g6 a
SystemClockConfig_STOP();//停机模式后唤醒，恢复时钟源' L' w) P* r o1 l0 p
HAL_Init();; ~) }# b7 t+ Z8 j% m
SystemClock_Config();
% r$ C! `5 t0 t3 }4 I# g+ G
SystemPower_Config();
0 F% V/ p: K) b
HAL_SPI_DeInit(&hspi1); A5 k- f' T4 p. @7 X6 E& E( D
HAL_GPIO_DeInit(GPIOA,GPIO_PIN_10);//串口重新初始化时HAL_UART_Init()函数会判断if(huart->State == HAL_UART_STATE_RESET),此时才会执行HAL_UART_MspInit(huart),配置串口IO口，这句话必须有！: e& \' s* f( X2 {/ S5 d' e, K: x
__HAL_RCC_GPIOA_CLK_ENABLE();
$ b, Y0 r) b' j- l) F
__HAL_RCC_GPIOA_CLK_ENABLE();& e2 y4 }2 s1 W' i
__HAL_RCC_GPIOB_CLK_ENABLE();
' R4 T( v8 p' g- H0 O( v
SPI_GPIO_Init();+ o% {( Y; s# u9 f$ y+ W3 P
UartHandle.Instance = USARTx;
" L, I* R" {2 L6 D% b! O; \
UartHandle.Init.BaudRate = uart_baud;
* s6 ]+ |" y) j2 ^5 ?" d
UartHandle.Init.WordLength = UART_WORDLENGTH_8B;
], Y' J1 D1 v
UartHandle.Init.StopBits = UART_STOPBITS_1;% g. ?( ?5 R6 z
UartHandle.Init.Parity = UART_PARITY_NONE;6 k0 Y8 d2 D. R) W
UartHandle.Init.HwFlowCtl = UART_HWCONTROL_NONE;
2 B2 R) V4 G( p6 Q, ?* }, v
UartHandle.Init.Mode = UART_MODE_TX_RX;
0 H) _2 U: b" o/ l, i) q
GPIO_InitTypeDef GPIO_InitStruct;
* ~8 D$ j X* ^# r4 C7 B; n8 z
/*##-1- Enable peripherals and GPIO Clocks #################################*/+ F$ _# x' J; I/ C2 I
/* Enable GPIO TX/RX clock */- Q4 s, }& z) l2 {
USARTx_TX_GPIO_CLK_ENABLE();& _+ Y0 ~* ~, z
USARTx_RX_GPIO_CLK_ENABLE();
+ s7 f) q0 X: s2 w/ W/ [& @& V' X! i
/* Enable USART2 clock */
b r7 t" l- r u2 {
USARTx_CLK_ENABLE();& ^, z& ]0 Q! ~3 e: m
/*##-2- Configure peripheral GPIO ##########################################*/) K+ @, L) S2 X- H0 O$ |* m
/* UART TX GPIO pin configuration */
2 ^0 |/ u$ y; Z$ I- P
GPIO_InitStruct.Pin = USARTx_TX_PIN;8 c! j- T- D$ g) G
GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;8 x: v- W, y4 h/ @
GPIO_InitStruct.Pull = GPIO_NOPULL;, e$ f I' T5 l7 o; a3 _! T* ?- m
GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH ;
2 c8 D. U9 O- k6 c
GPIO_InitStruct.Alternate = USARTx_TX_AF;
. ^& d6 i1 u* W+ [
HAL_GPIO_Init(USARTx_TX_GPIO_PORT, &GPIO_InitStruct);
& K! n* M/ C5 H; Z( r
/* UART RX GPIO pin configuration */8 S* w- m' M1 a; Y
GPIO_InitStruct.Pin = USARTx_RX_PIN;8 K; B2 m: q2 a/ _8 n- F
GPIO_InitStruct.Alternate = USARTx_RX_AF;8 w/ X w e5 Z9 \* W$ K+ W
HAL_GPIO_Init(USARTx_RX_GPIO_PORT, &GPIO_InitStruct);
7 J4 J9 j: A/ A; m. q
HAL_NVIC_DisableIRQ(EXTI4_15_IRQn);
! ]( y+ d( x9 A0 N
__HAL_GPIO_EXTI_CLEAR_IT(USARTx_RX_PIN);4 [6 g- e5 L5 S3 S* Q
HAL_NVIC_SetPriority(USARTx_IRQn, 4, 0);9 d& r# L) t3 u( a
HAL_NVIC_EnableIRQ(USARTx_IRQn);8 J3 [* i* A; C& U! t/ J( R
}) i6 J/ d7 I. F* N1 e' g, U, k
}