AON

HAL AON提供抽象的软件接口操作硬件AON(Always On)模块，用于控制芯片各个子系统的低功耗模式，芯片分为HPSYS和LPSYS两个子系统(电源域)，分别对应HPAON(hwp_hpsys_aon)和LPAON(hwp_lpsys_aon)，两个电源域的控制方法类似，支持的特性有:

PIN、RTC、LPTIM、MAILBOX和手动唤醒，PIN唤醒可以是电平触发也可以是边沿触发，手动唤醒指由另外一个核操作特定寄存器唤醒指定的核, MAILBOX唤醒指可以通过触发mailbox中断来唤醒对应的核，比如LPSYS可以配置 #L2H_MAILBOX 触发给HPSYS的MAILBOX中断，若HPSYS使能了MAILBOX唤醒，就能被该中断自动唤醒
各系列支持的唤醒源不同（部分系列的LPSYS还支持LPCOMP、BLE/BT唤醒），唤醒PIN的数量和映射关系也不同，详见唤醒PIN与GPIO管脚映射关系
支持LIGHT/DEEP/STANDBY三种低功耗模式，其中LIGHT和DEEP模式数字模块不会掉电，所有寄存器和SRAM都会保留，STANDBY模式数字模块会掉电，所有寄存器都会丢失，SRAM可以有选择的保留

备注

由于PIN的边沿检测存在延迟，如果被其它唤醒源唤醒时刚好有唤醒PIN的电平变化，就有可能在AON中断时看到WSR寄存器中的PIN唤醒标志还是0，过了一会儿才变为1，又因为对应的GPIO边沿检测这时还没准备好，就会导致WSR寄存器的PIN唤醒状态没有被清掉而一直不睡眠并且会丢失一次边沿检测的GPIO中断，如果没有使用SDK里drv_common.c实现的SysTick_Handler作为SysTick的中断服务程序，建议在自定义的SysTick中断服务程序中添加如下代码，当发现边沿触发的唤醒PIN标志为1时，手动触发一次GPIO中断回调函数。

    /* Trigger GPIO callback manually as GPIO edge detection interrupt may get lost
    and WSR.PIN status is not cleared */
#ifdef SOC_BF0_HCPU
    status = HAL_HPAON_GET_WSR() & HPSYS_AON_WSR_PIN_ALL;
    pin_wsr = status >> HPSYS_AON_WSR_PIN0_Pos;
    HAL_HPAON_CLEAR_WSR(status);
    wake_pin_num = HPSYS_AON_WSR_PIN_NUM;
#else
    status = HAL_LPAON_GET_WSR() & LPSYS_AON_WSR_PIN_ALL;
    pin_wsr = status >> LPSYS_AON_WSR_PIN0_Pos;
    HAL_LPAON_CLEAR_WSR(status);
    wake_pin_num = LPSYS_AON_WSR_PIN_NUM;
#endif

    for (i = 0; (i < wake_pin_num) && pin_wsr; i++)
    {
        if (pin_wsr & 1)
        {

            hal_status = HAL_AON_GetWakePinMode(i, &pin_mode);
            if ((HAL_OK == hal_status) && (pin_mode != AON_PIN_MODE_HIGH)
                    && (pin_mode != AON_PIN_MODE_LOW))
            {
                gpio = HAL_AON_QueryWakeupGpioPin(i, &pin);
                RT_ASSERT(gpio);
                HAL_GPIO_EXTI_Callback(gpio, pin);
            }
        }
        pin_wsr >>= 1;
    }

唤醒PIN与GPIO管脚映射关系

唤醒PIN与GPIO管脚固定绑定，可以通过 HAL_HPAON_QueryWakeupPin() / HAL_HPAON_QueryWakeupGpioPin()（LPSYS对应 HAL_LPAON_QueryWakeupPin() / HAL_LPAON_QueryWakeupGpioPin()）在唤醒PIN和GPIO管脚之间互查，接口详见API参考。各系列支持的唤醒源和唤醒PIN数量不同，下面按系列说明，表中 PBRn 表示RTC域的按键管脚，编号方法见PIN设备。

SF32LB55X

HPSYS支持4个唤醒PIN，LPSYS支持6个唤醒PIN，两个电源域各自独立。

HPSYS唤醒源：HPAON_WAKEUP_SRC_RTC、HPAON_WAKEUP_SRC_LPTIM1、HPAON_WAKEUP_SRC_LP2HP_REQ（手动唤醒）、 HPAON_WAKEUP_SRC_LP2HP_IRQ（MAILBOX唤醒），以及4个唤醒PIN HPAON_WAKEUP_SRC_PIN0 ~ HPAON_WAKEUP_SRC_PIN3
LPSYS唤醒源：LPAON_WAKEUP_SRC_RTC、LPAON_WAKEUP_SRC_LPTIM2、LPAON_WAKEUP_SRC_LPCOMP1、LPAON_WAKEUP_SRC_LPCOMP2、 LPAON_WAKEUP_SRC_BLE、LPAON_WAKEUP_SRC_HP2LP_REQ（手动唤醒）、LPAON_WAKEUP_SRC_HP2LP_IRQ（MAILBOX唤醒），以及6个唤醒PIN LPAON_WAKEUP_SRC_PIN0 ~ LPAON_WAKEUP_SRC_PIN5

HPSYS

Wakeup PIN	GPIO
PIN0	GPIO_A77
PIN1	GPIO_A78
PIN2	GPIO_A79
PIN3	GPIO_A80

LPSYS

Wakeup PIN	GPIO
PIN0	GPIO_B43
PIN1	GPIO_B44
PIN2	GPIO_B45
PIN3	GPIO_B46
PIN4	GPIO_B47
PIN5	GPIO_B48

使用HAL HPAON

配置睡眠

void example(void)
{
    /* Enable LPTIM1 as wakeup source */
    HAL_HPAON_EnableWakeupSrc(HPAON_WAKEUP_SRC_LPTIM1, AON_PIN_MODE_HIGH);
    /* Enable MAILBOX interrupt triggered by LPSYS as wakeup source */
    HAL_HPAON_EnableWakeupSrc(HPAON_WAKEUP_SRC_LP2HP_IRQ, AON_PIN_MODE_HIGH);
    /* Enable manual wakeup triggered by LPSYS */
    HAL_HPAON_EnableWakeupSrc(HPAON_WAKEUP_SRC_LP2HP_REQ, AON_PIN_MODE_HIGH);
    /* Enable PIN0 low level wakeup, PIN0 is bound to a fixed gpio pin,
       refer to the wakeup pin mapping table of the target chip series */
    HAL_HPAON_EnableWakeupSrc(HPAON_WAKEUP_SRC_PIN0, AON_PIN_MODE_LOW);

    ...

    /* Configure HPSYS enter LIGHT mode */
    HAL_HPAON_EnterLightSleep(0);
}

查询唤醒PIN和对应的GPIO管脚

void example(void)
{
    int8_t wakeup_pin;
    uint16_t gpio_pin;
    GPIO_TypeDef *gpio;

    /* Query which wakeup pin is mapping to the gpio pin, take GPIO_A80 of
       SF32LB55X as an example, if found return value >=0, otherwise, return -1 */
    wakeup_pin = HAL_HPAON_QueryWakeupPin(hwp_gpio1, 80);

    /* Query which GPIO PIN is mapping to wakeup pin0,
       if found, return GPIO instance and pin id, otherwise return NULL */
    gpio = HAL_HPAON_QueryWakeupGpioPin(0, &gpio_pin);
}

使用HAL LPAON

配置睡眠

void example(void)
{
    /* Enable LPTIM2 as wakeup source */
    HAL_LPAON_EnableWakeupSrc(LPAON_WAKEUP_SRC_LPTIM2, AON_PIN_MODE_HIGH);
    /* Enable MAILBOX interrupt triggered by HPSYS as wakeup source */
    HAL_LPAON_EnableWakeupSrc(LPAON_WAKEUP_SRC_HP2LP_IRQ, AON_PIN_MODE_HIGH);
    /* Enable manual wakeup triggered by HPSYS */
    HAL_LPAON_EnableWakeupSrc(LPAON_WAKEUP_SRC_HP2LP_REQ, AON_PIN_MODE_HIGH);
    /* Enable PIN0 low level wakeup, PIN0 is bound to a fixed gpio pin,
       refer to the wakeup pin mapping table of the target chip series */
    HAL_LPAON_EnableWakeupSrc(LPAON_WAKEUP_SRC_PIN0, AON_PIN_MODE_LOW);

    ...

    /* Configure LPSYS enter LIGHT mode */
    HAL_LPAON_EnterLightSleep(0);
}

查询唤醒PIN和对应的GPIO管脚

void example(void)
{
    int8_t wakeup_pin;
    uint16_t gpio_pin;
    GPIO_TypeDef *gpio;

    /* Query which wakeup pin is mapping to the gpio pin, take GPIO_B43 of
       SF32LB55X as an example, if found return value >=0, otherwise, return -1 */
    wakeup_pin = HAL_LPAON_QueryWakeupPin(hwp_gpio2, 43);

    /* Query which GPIO PIN is mapping to wakeup pin0,
       if found, return GPIO instance and pin id, otherwise return NULL */
    gpio = HAL_LPAON_QueryWakeupGpioPin(0, &gpio_pin);
}

API参考

bf0_hal_aon.h