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LibrePilot/flight/pios/stm32f10x/pios_usb.c

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/**
******************************************************************************
* @addtogroup PIOS PIOS Core hardware abstraction layer
* @{
* @addtogroup PIOS_USB USB Setup Functions
* @brief PIOS USB device implementation
* @{
*
* @file pios_usb.c
* @author The OpenPilot Team, http://www.openpilot.org Copyright (C) 2010.
* @brief USB device functions (STM32 dependent code)
* @see The GNU Public License (GPL) Version 3
*
*****************************************************************************/
/*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "pios.h"
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#ifdef PIOS_INCLUDE_USB
#include "usb_lib.h"
#include "pios_usb_board_data.h"
#include "stm32f10x.h"
#include "pios_usb_priv.h"
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#ifdef PIOS_INCLUDE_USB_HID
/* Rx/Tx status */
static bool transfer_possible = false;
enum pios_usb_dev_magic {
PIOS_USB_DEV_MAGIC = 0x17365904,
};
struct pios_usb_dev {
enum pios_usb_dev_magic magic;
const struct pios_usb_cfg *cfg;
};
/**
* @brief Validate the usb device structure
* @returns 0 if valid device or -1 otherwise
*/
static int32_t PIOS_USB_validate(struct pios_usb_dev *usb_dev)
{
if (usb_dev == NULL) {
return -1;
}
if (usb_dev->magic != PIOS_USB_DEV_MAGIC) {
return -1;
}
return 0;
}
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#ifdef PIOS_INCLUDE_FREERTOS
static struct pios_usb_dev *PIOS_USB_alloc(void)
{
struct pios_usb_dev *usb_dev;
usb_dev = (struct pios_usb_dev *)pvPortMalloc(sizeof(*usb_dev));
if (!usb_dev) {
return NULL;
}
usb_dev->magic = PIOS_USB_DEV_MAGIC;
return usb_dev;
}
#else
static struct pios_usb_dev pios_usb_devs[PIOS_USB_MAX_DEVS];
static uint8_t pios_usb_num_devs;
static struct pios_usb_dev *PIOS_USB_alloc(void)
{
struct pios_usb_dev *usb_dev;
if (pios_usb_num_devs >= PIOS_USB_MAX_DEVS) {
return NULL;
}
usb_dev = &pios_usb_devs[pios_usb_num_devs++];
usb_dev->magic = PIOS_USB_DEV_MAGIC;
return usb_dev;
}
#endif /* ifdef PIOS_INCLUDE_FREERTOS */
/**
* Initialises USB COM layer
* \return < 0 if initialisation failed
* \note Applications shouldn't call this function directly, instead please use \ref PIOS_COM layer functions
*/
static uint32_t pios_usb_com_id;
int32_t PIOS_USB_Init(uint32_t *usb_id, const struct pios_usb_cfg *cfg)
{
PIOS_Assert(usb_id);
PIOS_Assert(cfg);
struct pios_usb_dev *usb_dev;
usb_dev = (struct pios_usb_dev *)PIOS_USB_alloc();
if (!usb_dev) {
goto out_fail;
}
/* Bind the configuration to the device instance */
usb_dev->cfg = cfg;
PIOS_USB_Reenumerate();
/*
* This is a horrible hack to make this available to
* the interrupt callbacks. This should go away ASAP.
*/
pios_usb_com_id = (uint32_t)usb_dev;
/* Enable the USB Interrupts */
NVIC_Init(&usb_dev->cfg->irq.init);
/* Select USBCLK source */
RCC_USBCLKConfig(RCC_USBCLKSource_PLLCLK_1Div5);
/* Enable the USB clock */
RCC_APB1PeriphClockCmd(RCC_APB1Periph_USB, ENABLE);
USB_Init();
USB_SIL_Init();
*usb_id = (uint32_t)usb_dev;
return 0; /* No error */
out_fail:
return -1;
}
/**
* This function is called by the USB driver on cable connection/disconnection
* \param[in] connected connection status (1 if connected)
* \return < 0 on errors
* \note Applications shouldn't call this function directly, instead please use \ref PIOS_COM layer functions
*/
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int32_t PIOS_USB_ChangeConnectionState(bool Connected)
{
// In all cases: re-initialise USB HID driver
if (Connected) {
transfer_possible = true;
// TODO: Check SetEPRxValid(ENDP1);
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#ifdef USB_LED_ON
USB_LED_ON; // turn the USB led on
#endif
} else {
// Cable disconnected: disable transfers
transfer_possible = false;
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#ifdef USB_LED_OFF
USB_LED_OFF; // turn the USB led off
#endif
}
return 0;
}
int32_t PIOS_USB_Reenumerate()
{
/* Force USB reset and power-down (this will also release the USB pins for direct GPIO control) */
_SetCNTR(CNTR_FRES | CNTR_PDWN);
/* Using a "dirty" method to force a re-enumeration: */
/* Force DPM (Pin PA12) low for ca. 10 mS before USB Tranceiver will be enabled */
/* This overrules the external Pull-Up at PA12, and at least Windows & MacOS will enumerate again */
GPIO_InitTypeDef GPIO_InitStructure;
GPIO_StructInit(&GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_12;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);
PIOS_DELAY_WaitmS(50);
/* Release power-down, still hold reset */
_SetCNTR(CNTR_PDWN);
PIOS_DELAY_WaituS(5);
/* CNTR_FRES = 0 */
_SetCNTR(0);
/* Clear pending interrupts */
_SetISTR(0);
/* Configure USB clock */
/* USBCLK = PLLCLK / 1.5 */
RCC_USBCLKConfig(RCC_USBCLKSource_PLLCLK_1Div5);
/* Enable USB clock */
RCC_APB1PeriphClockCmd(RCC_APB1Periph_USB, ENABLE);
return 0;
}
bool PIOS_USB_CableConnected(__attribute__((unused)) uint8_t id)
{
struct pios_usb_dev *usb_dev = (struct pios_usb_dev *)pios_usb_com_id;
if (PIOS_USB_validate(usb_dev) != 0) {
return false;
}
return ((usb_dev->cfg->vsense.gpio->IDR & usb_dev->cfg->vsense.init.GPIO_Pin) != 0) ^ usb_dev->cfg->vsense_active_low;
}
/**
* This function returns the connection status of the USB HID interface
* \return 1: interface available
* \return 0: interface not available
* \note Applications shouldn't call this function directly, instead please use \ref PIOS_COM layer functions
*/
bool PIOS_USB_CheckAvailable(uint32_t id)
{
struct pios_usb_dev *usb_dev = (struct pios_usb_dev *)pios_usb_com_id;
if (PIOS_USB_validate(usb_dev) != 0) {
return false;
}
return PIOS_USB_CableConnected(id) && transfer_possible;
}
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#endif /* PIOS_INCLUDE_USB_HID */
#endif /* PIOS_INCLUDE_USB */
/**
* @}
* @}
*/