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/*!
\file usbd_pwr.c
\brief USB device power management driver
*/
/*
Copyright (C) 2017 GigaDevice
2017-02-10, V1.0.0, firmware for GD32F30x
*/
#include "usbd_pwr.h"
#ifdef USBD_LOWPWR_MODE_ENABLE
static void lowpower_mode_exit (void);
#endif /* USBD_LOWPWR_MODE_ENABLE */
__IO uint8_t g_ESOF_count = 0U;
__IO uint8_t g_suspend_enabled = 1U;
__IO uint8_t g_remote_wakeup_on = 0U;
#ifdef LPM_ENABLED
extern __IO uint32_t L1_resume;
#endif /* LPM_ENABLED */
/*!
\brief USB wakeup first operation is to wakeup mcu
\param[in] none
\param[out] none
\retval none
*/
void resume_mcu (void)
{
/* clear low_power mode bit in USBD_CTL */
USBD_REG_SET(USBD_CTL, USBD_REG_GET(USBD_CTL) & (~CTL_LOWM));
#ifdef USBD_LOWPWR_MODE_ENABLE
/* restore normal operations */
lowpower_mode_exit();
#endif /* USBD_LOWPWR_MODE_ENABLE */
/* clear SETSPS bit */
USBD_REG_SET(USBD_CTL, USBD_REG_GET(USBD_CTL) & (~CTL_SETSPS));
}
#ifdef USBD_LOWPWR_MODE_ENABLE
/*!
\brief restore system clocks and power while exiting suspend mode
\param[in] none
\param[out] none
\retval none
*/
static void lowpower_mode_exit (void)
{
/* restore system clock */
/* enable HSE */
rcu_osci_on(RCU_HXTAL);
/* wait till HSE is ready */
while(RESET == rcu_flag_get(RCU_FLAG_HXTALSTB));
/* enable PLL */
rcu_osci_on(RCU_PLL_CK);
/* wait till PLL is ready */
while(RESET == rcu_flag_get(RCU_FLAG_PLLSTB));
/* select PLL as system clock source */
rcu_system_clock_source_config(RCU_CKSYSSRC_PLL);
/* wait till PLL is used as system clock source */
while(0x08 != rcu_system_clock_source_get());
/* low power sleep on exit disabled */
system_lowpower_reset(SCB_LPM_DEEPSLEEP);
}
#endif /* USBD_LOWPWR_MODE_ENABLE */
/*!
\brief set USB device to suspend mode
\param[in] none
\param[out] none
\retval none
*/
void usbd_suspend (void)
{
/* set usb module to suspend and low-power mode */
USBD_REG_SET(USBD_CTL, USBD_REG_GET(USBD_CTL) | CTL_SETSPS | CTL_LOWM);
#ifdef USBD_LOWPWR_MODE_ENABLE
/* check wakeup flag is set */
if (0 == (USBD_REG_GET(USBD_INTF) & INTF_WKUPIF)) {
/* enter DEEP_SLEEP mode with LDO in low power mode */
pmu_to_deepsleepmode(PMU_LDO_LOWPOWER, WFI_CMD);
} else {
/* clear wakeup interrupt flag */
USBD_REG_SET(USBD_INTF, CLR_WKUPIF);
/* clear set_suspend flag */
USBD_REG_SET(USBD_CTL, USBD_REG_GET(USBD_CTL) & ~CTL_SETSPS);
}
#endif /* USBD_LOWPWR_MODE_ENABLE */
}
/*!
\brief start to remote wakeup
\param[in] none
\param[out] none
\retval none
*/
void usbd_remote_wakeup_active(void)
{
resume_mcu();
#ifdef LPM_ENABLED
USBD_REG_SET(USBD_CTL, USBD_REG_GET(USBD_CTL) | CTL_L1RSREQ);
L1_resume = 1U;
#else
g_remote_wakeup_on = 1U;
g_ESOF_count = 15U;
USBD_REG_SET(USBD_CTL, USBD_REG_GET(USBD_CTL) | CTL_RSREQ);
#endif /* LPM_ENABLED */
}
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