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26d8fe4383
The STM32F3 requires a dedicated digital signal to emulate a disconnect event by pulling D+ down via a 1.5 kOhm resistor. Some boards, such as the OLIMEXINO-STM32F3, do not directly connect a GPIO but place a transistor in between. Depending on the exact implementation, the logic level may end up being inverted compared to directly connecting a GPIO. This adds a flag member to the `stm32_usbdev_fs_config_t` and a new flag to indicate inverted logic. In addition the members in the struct are sorted by alignment, as this is a foolproof algorithm to prevent wasting memory on unneeded padding. Finally, the USB driver is adapted to honor the flag. Co-authored-by: crasbe <crasbe@gmail.com>
72 lines
1.8 KiB
C
72 lines
1.8 KiB
C
/*
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* Copyright (C) 2016 Freie Universität Berlin
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* 2017 OTA keys S.A.
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*
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* This file is subject to the terms and conditions of the GNU Lesser
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* General Public License v2.1. See the file LICENSE in the top level
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* directory for more details.
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*/
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#pragma once
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/**
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* @ingroup cpu_stm32_usbdev
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* @{
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*
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* @file
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* @brief USB CPU specific definitions for the STM32 family
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*
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* @author Hauke Petersen <hauke.petersen@fu-berlin.de>
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* @author Vincent Dupont <vincent@otakeys.com>
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*/
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#include <stdint.h>
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#include "periph/cpu_gpio.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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/**
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* @brief USBDEV buffers must be word aligned because of DMA restrictions
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*/
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#define USBDEV_CPU_DMA_ALIGNMENT (4)
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/**
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* @brief USBDEV buffer instantiation requirement
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*/
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#define USBDEV_CPU_DMA_REQUIREMENTS __attribute__((aligned(USBDEV_CPU_DMA_ALIGNMENT)))
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/**
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* @name Flags used in stm32_usbdev_fs_config_t
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* @{
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*/
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/**
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* @brief Indicates that logic levels are inverted compared to a GPIO connected
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* directly via a 1.5 kOhm resistor to the USB D+ signal.
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*/
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#define STM32_USBDEV_FS_CONFIG_FLAG_DISCONN_INVERTED 0x01
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/** @} */
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/**
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* @brief stm32 USB device FS configuration
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*/
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typedef struct {
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uintptr_t base_addr; /**< USB peripheral base address */
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uint32_t rcc_mask; /**< bit in clock enable register */
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gpio_t dm; /**< Data- gpio */
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gpio_t dp; /**< Data+ gpio */
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gpio_af_t af; /**< Alternative function */
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gpio_t disconn; /**< GPIO if used for USB disconnect */
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uint8_t irqn; /**< IRQ channel */
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uint8_t apb; /**< APB bus */
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uint8_t flags; /**< Configuration flags */
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} stm32_usbdev_fs_config_t;
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#ifdef __cplusplus
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}
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#endif
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/** @} */
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