108 lines
2.7 KiB
C
108 lines
2.7 KiB
C
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/**************************************************************************//**
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*
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* @copyright (C) 2020 Nuvoton Technology Corp. All rights reserved.
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*
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* SPDX-License-Identifier: Apache-2.0
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*
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* Change Logs:
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* Date Author Notes
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* 2020-09-17 CHChen First version
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*
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******************************************************************************/
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#include <rtconfig.h>
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#if defined(BSP_USING_OTG)
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#include <rtdevice.h>
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#include <rtdbg.h>
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#include <NuMicro.h>
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/* This delay must be at least 10 us */
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static void _usb_init_delay(void)
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{
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volatile uint32_t i = 0x1000;
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while (i--)
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__NOP();
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return;
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}
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/* Check current usb role */
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static void usb_role(void)
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{
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uint32_t status;
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status = (OTG->STATUS) & (OTG_STATUS_ASHOST_Msk | OTG_STATUS_ASPERI_Msk | OTG_STATUS_IDSTS_Msk);
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if (status == (OTG_STATUS_IDSTS_Msk | OTG_STATUS_ASPERI_Msk))
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rt_kprintf("usb frame acts as peripheral\n");
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else if (status == OTG_STATUS_ASHOST_Msk)
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rt_kprintf("usb frame acts as host\n");
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else
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rt_kprintf("usb frame is unknown state: 0x%x\n", status);
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return;
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}
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MSH_CMD_EXPORT_ALIAS(usb_role, usb_role, check usb role);
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static int otg_init(void)
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{
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SYS_UnlockReg();
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/* Set OTG as ID dependent role */
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SYS->USBPHY = (SYS->USBPHY & ~SYS_USBPHY_USBROLE_Msk) | SYS_USBPHY_OTGPHYEN_Msk | SYS_USBPHY_SBO_Msk | (0x2 << SYS_USBPHY_USBROLE_Pos);
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OTG_ENABLE();
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/* Enable OTG and ID detection function */
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OTG_ENABLE_PHY();
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/* Enable ID detection function */
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OTG_ENABLE_ID_DETECT();
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/* Enable OTG interrupt */
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NVIC_EnableIRQ(USBOTG_IRQn);
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_usb_init_delay();
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/* clear interrupt and enable relative interrupts */
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OTG_ENABLE_INT(OTG_INTEN_IDCHGIEN_Msk | OTG_INTEN_HOSTIEN_Msk | OTG_INTEN_PDEVIEN_Msk |
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OTG_INTEN_BVLDCHGIEN_Msk | OTG_INTEN_AVLDCHGIEN_Msk);
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SYS_LockReg();
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return (int)RT_EOK;
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}
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INIT_DEVICE_EXPORT(otg_init);
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/* OTG interrupt entry */
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void USBOTG_IRQHandler(void)
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{
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__IO uint32_t u32INTEN;
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u32INTEN = OTG->INTEN;
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/* usb id pin status change */
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if (u32INTEN & OTG_INTSTS_IDCHGIF_Msk)
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{
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if (OTG_GET_STATUS(OTG_STATUS_IDSTS_Msk))
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LOG_D("usb frame acts as peripheral\n");
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OTG_CLR_INT_FLAG(OTG_INTSTS_IDCHGIF_Msk);
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LOG_D("usb id change");
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}
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/* B-device session valid state change */
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if (u32INTEN & OTG_INTSTS_BVLDCHGIF_Msk)
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{
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if (OTG_GET_STATUS(OTG_STATUS_IDSTS_Msk) == 0)
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LOG_D("usb frame acts as host\n");
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OTG_CLR_INT_FLAG(OTG_INTSTS_BVLDCHGIF_Msk);
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LOG_D("usb b-device session valid state change");
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}
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/* Clear all interrupt flags */
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OTG->INTSTS = u32INTEN;
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}
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#endif /* defined(BSP_USING_OTG) */
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