STM32L051進(jìn)入STOP模式后递览，除去通過(guò)RTC喚醒冀瓦，還可通過(guò)外部中斷喚醒，在stop without rtc模式下電流消耗能達(dá)到0.4uA康吵。很多時(shí)候酬诀，我們需要使用STM32的串口進(jìn)行喚醒托酸，比如接收到串口命令后MCU喚醒進(jìn)行相關(guān)操作吊履。本文總結(jié)下STM32L051的STOP模式寨典，通過(guò)外部中斷「按鍵耀盗、串口」進(jìn)行喚醒想虎。
串口喚醒的思路就是在MCU進(jìn)入STOP前將RX腳設(shè)為EXTI模式，并使能對(duì)應(yīng)的中斷叛拷，喚醒后重新初始化串口舌厨、配置時(shí)鐘。實(shí)際上都是使用的外部中斷喚醒忿薇。
- 在進(jìn)入STOP模式前對(duì)外設(shè)進(jìn)行設(shè)置邓线，GPIO要設(shè)置成模擬輸入狀態(tài),取消串口配置恢復(fù)默認(rèn)。
static void system_config_before_stop(void)
{
GPIO_InitTypeDef GPIO_Initure;
HAL_UART_DeInit(&huart1);
/* Enable Ultra low power mode */
HAL_PWREx_EnableUltraLowPower();
/* Enable the fast wake up from Ultra low power mode */
HAL_PWREx_EnableFastWakeUp();
/* Select HSI as system clock source after Wake Up from Stop mode */
__HAL_RCC_WAKEUPSTOP_CLK_CONFIG(RCC_STOP_WAKEUPCLOCK_HSI);
/* Enable GPIOs clock */
__HAL_RCC_GPIOA_CLK_ENABLE();
__HAL_RCC_GPIOB_CLK_ENABLE();
__HAL_RCC_GPIOC_CLK_ENABLE();
/* Configure all GPIO port pins in Analog Input mode (floating input trigger OFF) */
GPIO_Initure.Pin = GPIO_PIN_All;
GPIO_Initure.Mode = GPIO_MODE_ANALOG;
GPIO_Initure.Pull = GPIO_NOPULL;
HAL_GPIO_Init(GPIOA, &GPIO_Initure);
HAL_GPIO_Init(GPIOB, &GPIO_Initure);
HAL_GPIO_Init(GPIOC, &GPIO_Initure);
/* Disable GPIOs clock */
__HAL_RCC_GPIOA_CLK_DISABLE();
__HAL_RCC_GPIOB_CLK_DISABLE();
__HAL_RCC_GPIOC_CLK_DISABLE();
}
- 設(shè)置喚醒源中斷煌恢，這里配置了按鍵和串口RX相關(guān)中斷骇陈。
static void stop_exit_config(void)
{
GPIO_InitTypeDef GPIO_Initure = {0};
__HAL_RCC_GPIOA_CLK_ENABLE();
GPIO_Initure.Pin = KEY_PIN;
GPIO_Initure.Mode = GPIO_MODE_IT_RISING;
GPIO_Initure.Pull = GPIO_PULLDOWN;
HAL_GPIO_Init(KEY_PORT, &GPIO_Initure);
HAL_NVIC_SetPriority(EXTI2_3_IRQn, 3, 0);
HAL_NVIC_EnableIRQ(EXTI2_3_IRQn);
GPIO_Initure.Pin = GPIO_PIN_10;
GPIO_Initure.Mode = GPIO_MODE_IT_FALLING;
GPIO_Initure.Pull = GPIO_PULLUP;
HAL_GPIO_Init(GPIOA, &GPIO_Initure);
HAL_NVIC_SetPriority(EXTI4_15_IRQn, 2, 0);
HAL_NVIC_EnableIRQ(EXTI4_15_IRQn);
}
- 調(diào)用庫(kù)函數(shù)進(jìn)入STOP模式。
HAL_PWR_EnterSTOPMode(PWR_LOWPOWERREGULATOR_ON, PWR_STOPENTRY_WFI);
- 退出STOP模式后要恢復(fù)時(shí)鐘瑰抵。特別注意在進(jìn)入STOP模式后系統(tǒng)時(shí)鐘變成了MSI你雌。
static void clock_config_after_stop(void)
{
HAL_StatusTypeDef ret = HAL_OK;
RCC_OscInitTypeDef RCC_OscInitStructure = {0};
RCC_ClkInitTypeDef RCC_ClkInitStructure = {0};
/* Enable Power Control clock */
__HAL_RCC_PWR_CLK_ENABLE();
/* The voltage scaling allows optimizing the power consumption when the device is
clocked below the maximum system frequency, to update the voltage scaling value
regarding system frequency refer to product datasheet. */
__HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE1);
/* Get the Oscillators configuration according to the internal RCC registers */
HAL_RCC_GetOscConfig(&RCC_OscInitStructure);
/* After wake-up from STOP reconfigure the system clock: Enable HSI and PLL */
RCC_OscInitStructure.OscillatorType = RCC_OSCILLATORTYPE_HSI;
RCC_OscInitStructure.HSEState = RCC_HSE_OFF;
RCC_OscInitStructure.HSIState = RCC_HSI_ON;
RCC_OscInitStructure.HSICalibrationValue = RCC_HSICALIBRATION_DEFAULT;
RCC_OscInitStructure.PLL.PLLState = RCC_PLL_ON;
RCC_OscInitStructure.PLL.PLLSource = RCC_PLLSOURCE_HSI;
RCC_OscInitStructure.PLL.PLLMUL = RCC_PLLMUL_4;
RCC_OscInitStructure.PLL.PLLDIV = RCC_PLLDIV_2;
ret = HAL_RCC_OscConfig(&RCC_OscInitStructure); //3?ê??ˉ
if (ret != HAL_OK) while (1);
/* Select PLL as system clock source and configure the HCLK, PCLK1 and PCLK2
clocks dividers */
RCC_ClkInitStructure.ClockType = RCC_CLOCKTYPE_SYSCLK;
RCC_ClkInitStructure.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
ret = HAL_RCC_ClockConfig(&RCC_ClkInitStructure, FLASH_LATENCY_1); //í?ê±éè??FLASH?óê±?ü?ú?a1
if (ret != HAL_OK) while (1);
}
- 恢復(fù)各外設(shè)狀態(tài)，比如GPIO二汛、串口等初始化婿崭。
- 在需要進(jìn)入STOP模式的地方直接調(diào)用函數(shù)。
static void enter_stop_mode(void)
{
//1. 配置stop之前各外設(shè)
system_config_before_stop();
//2.設(shè)置喚醒中斷
stop_exit_config();
//3. 進(jìn)入stop
HAL_PWR_EnterSTOPMode(PWR_LOWPOWERREGULATOR_ON, PWR_STOPENTRY_WFI);
//3.退出stop后恢復(fù)各外設(shè)
clock_config_after_stop();
//4.恢復(fù)各外設(shè)
gpioInit();
uart1Init(115200);
}
目前測(cè)試到消耗電流與數(shù)據(jù)手冊(cè)一致肴颊。
stop
