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ChibiOS/os/hal/platforms/STM32/usb_lld.c

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/*
ChibiOS/RT - Copyright (C) 2006,2007,2008,2009,2010 Giovanni Di Sirio.
This file is part of ChibiOS/RT.
ChibiOS/RT 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.
ChibiOS/RT 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, see <http://www.gnu.org/licenses/>.
*/
/**
* @file STM32/usb_lld.c
* @brief STM32 USB subsystem low level driver source.
*
* @addtogroup USB
* @{
*/
#include "ch.h"
#include "hal.h"
#include "usb.h"
#if HAL_USE_USB || defined(__DOXYGEN__)
#define BTABLE_ADDR 0x0000
/*===========================================================================*/
/* Driver exported variables. */
/*===========================================================================*/
/** @brief USB1 driver identifier.*/
#if STM32_USB_USE_USB1 || defined(__DOXYGEN__)
USBDriver USBD1;
#endif
/**
* @brief EP0 initialization structure.
*/
const USBEndpointConfig usb_lld_ep0config = {
_usb_ep0in,
_usb_ep0out,
0x40,
0x40,
EPR_EP_TYPE_CONTROL | EPR_STAT_TX_STALL | EPR_STAT_RX_VALID,
0x40,
0x80
};
/*===========================================================================*/
/* Driver local variables. */
/*===========================================================================*/
/*===========================================================================*/
/* Driver local functions. */
/*===========================================================================*/
/*===========================================================================*/
/* Driver interrupt handlers. */
/*===========================================================================*/
#if STM32_USB_USE_USB1 || defined(__DOXYGEN__)
/**
* @brief USB high priority interrupt handler.
*
* @isr
*/
CH_IRQ_HANDLER(USB_HP_IRQHandler) {
CH_IRQ_PROLOGUE();
CH_IRQ_EPILOGUE();
}
/**
* @brief USB low priority interrupt handler.
*
* @isr
*/
CH_IRQ_HANDLER(USB_LP_IRQHandler) {
uint32_t istr;
USBDriver *usbp = &USBD1;
CH_IRQ_PROLOGUE();
istr = STM32_USB->ISTR;
/* USB bus reset condition handling.*/
if (istr & ISTR_RESET) {
_usb_reset(usbp);
if (usbp->usb_config->uc_event_cb)
usbp->usb_config->uc_event_cb(usbp, USB_EVENT_RESET);
STM32_USB->ISTR = ~ISTR_RESET;
}
/* SOF handling.*/
if (istr & ISTR_SOF) {
if (usbp->usb_config->uc_sof_cb)
usbp->usb_config->uc_sof_cb(usbp);
STM32_USB->ISTR = ~ISTR_SOF;
}
/* Endpoint events handling.*/
while (istr & ISTR_CTR) {
uint32_t ep;
uint32_t epr = STM32_USB->EPR[ep = istr & ISTR_EP_ID_MASK];
if (epr & EPR_CTR_TX) {
/* IN endpoint, transmission.*/
EPR_CLEAR_CTR_TX(ep);
if (usbp->usb_epc[ep]->uepc_in_cb)
usbp->usb_epc[ep]->uepc_in_cb(usbp, ep);
}
if (epr & EPR_CTR_RX) {
/* OUT endpoint, receive.*/
EPR_CLEAR_CTR_RX(ep);
if (usbp->usb_epc[ep]->uepc_out_cb)
usbp->usb_epc[ep]->uepc_out_cb(usbp, ep);
}
istr = STM32_USB->ISTR;
}
CH_IRQ_EPILOGUE();
}
#endif
/*===========================================================================*/
/* Driver exported functions. */
/*===========================================================================*/
/**
* @brief Low level USB driver initialization.
*
* @notapi
*/
void usb_lld_init(void) {
/* USB reset, ensures reset state in order to avoid trouble with JTAGs.*/
RCC->APB1RSTR = RCC_APB1RSTR_USBRST;
RCC->APB1RSTR = 0;
/* Driver initialization.*/
usbObjectInit(&USBD1);
}
/**
* @brief Configures and activates the USB peripheral.
*
* @param[in] usbp pointer to the @p USBDriver object
*
* @notapi
*/
void usb_lld_start(USBDriver *usbp) {
if (usbp->usb_state == USB_STOP) {
/* Clock activation.*/
#if STM32_USB_USE_USB1
if (&USBD1 == usbp) {
/* USB clock enabled.*/
RCC->APB1ENR |= RCC_APB1ENR_USBEN;
/* Powers up the transceiver while holding the USB in reset state.*/
STM32_USB->CNTR = CNTR_FRES;
/* Enabling the USB IRQ vectors, this also gives enough time to allow
the transceiver power up (1uS).*/
NVICEnableVector(USB_HP_CAN1_TX_IRQn,
CORTEX_PRIORITY_MASK(STM32_USB_USB1_HP_IRQ_PRIORITY));
NVICEnableVector(USB_LP_CAN1_RX0_IRQn,
CORTEX_PRIORITY_MASK(STM32_USB_USB1_LP_IRQ_PRIORITY));
/* Reset procedure enforced on driver start.*/
_usb_reset(&USBD1);
}
#endif
}
/* Configuration.*/
}
/**
* @brief Deactivates the USB peripheral.
*
* @param[in] usbp pointer to the @p USBDriver object
*
* @notapi
*/
void usb_lld_stop(USBDriver *usbp) {
/* If in ready state then disables the USB clock.*/
if (usbp->usb_state == USB_STOP) {
#if STM32_ADC_USE_ADC1
if (&USBD1 == usbp) {
NVICDisableVector(USB_HP_CAN1_TX_IRQn);
NVICDisableVector(USB_LP_CAN1_RX0_IRQn);
RCC->APB1ENR &= ~RCC_APB1ENR_USBEN;
}
#endif
}
}
/**
* @brief USB low level reset routine.
*
* @param[in] usbp pointer to the @p USBDriver object
*
* @notapi
*/
void usb_lld_reset(USBDriver *usbp) {
uint32_t cntr;
/* Powers up the transceiver while holding the USB in reset state.*/
STM32_USB->CNTR = CNTR_FRES;
/* Releases the USB reset, BTABLE is reset to zero.*/
STM32_USB->CNTR = 0;
STM32_USB->ISTR = 0;
STM32_USB->DADDR = DADDR_EF;
cntr = /*CNTR_ESOFM | */ CNTR_RESETM | /*CNTR_SUSPM |*/
/*CNTR_WKUPM | CNTR_ERRM | CNTR_PMAOVRM |*/ CNTR_CTRM;
/* The SOF interrupt is only enabled if a callback is defined for
this service because it is an high rate source.*/
if (usbp->usb_config->uc_sof_cb != NULL)
cntr |= CNTR_SOFM;
STM32_USB->CNTR = cntr;
}
/**
* @brief Sets the USB address.
*
* @param[in] usbp pointer to the @p USBDriver object
* @param[in] addr the USB address
*
* @notapi
*/
void usb_lld_set_address(USBDriver *usbp, uint8_t addr) {
STM32_USB->DADDR = (uint32_t)addr | DADDR_EF;
}
/**
* @brief Enables an endpoint.
*
* @param[in] usbp pointer to the @p USBDriver object
* @param[in] ep endpoint number
* @param[in] epcp the endpoint configuration
*
* @notapi
*/
void usb_lld_enable_endpoint(USBDriver *usbp, usbep_t ep,
const USBEndpointConfig *epcp) {
uint16_t nblocks;
stm32_usb_descriptor_t *dp;
/* EPxR register setup.*/
EPR_SET(ep, epcp->uepc_epr | ep);
EPR_TOGGLE(ep, epcp->uepc_epr);
/* Endpoint size and address initialization.*/
if (epcp->uepc_out_maxsize > 62)
nblocks = (((((epcp->uepc_out_maxsize - 1) | 0x1f) + 1) / 32) << 10) | 0x8000;
else
nblocks = ((((epcp->uepc_out_maxsize - 1) | 1) + 1) / 2) << 10;
dp = USB_GET_DESCRIPTOR(ep);
dp->TXCOUNT = 0;
dp->RXCOUNT = nblocks;
dp->TXADDR = epcp->uepc_inaddr;
dp->RXADDR = epcp->uepc_outaddr;
/* Logically enabling the endpoint in the USBDriver structure.*/
usbp->usb_epc[ep] = epcp;
}
/**
* @brief Disables all the active endpoints except the endpoint zero.
*
* @param[in] usbp pointer to the @p USBDriver object
*
* @notapi
*/
void usb_lld_disable_endpoints(USBDriver *usbp) {
unsigned i;
for (i = 1; i <= USB_ENDOPOINTS_NUMBER; i++) {
EPR_TOGGLE(i, 0);
EPR_SET(i, 0);
}
}
/**
* @brief Returns the number of bytes readable from the receive packet
* buffer.
*
* @param[in] usbp pointer to the @p USBDriver object
* @param[in] ep endpoint number
* @return The number of bytes that are effectively available.
* @retval 0 Data not yet available.
*
* @notapi
*/
size_t usb_lld_get_readable(USBDriver *usbp, usbep_t ep) {
if ((STM32_USB->EPR[ep] & EPR_STAT_RX_MASK) != EPR_STAT_RX_NAK)
return 0;
return (size_t)(USB_GET_DESCRIPTOR(ep)->RXCOUNT & RXCOUNT_COUNT_MASK);
}
/**
* @brief Endpoint read.
* @details The buffered packet is copied into the user buffer and then
* the endpoint is brought to the valid state in order to allow
* reception of more data.
*
* @param[in] usbp pointer to the @p USBDriver object
* @param[in] ep endpoint number
* @param[out] buf buffer where to copy the endpoint data
* @param[in] n maximum number of bytes to copy
* @return The number of bytes that were effectively available.
* @retval 0 Data not yet available.
*
* @notapi
*/
size_t usb_lld_read(USBDriver *usbp, usbep_t ep, uint8_t *buf, size_t n) {
uint32_t *pmap;
stm32_usb_descriptor_t *udp;
size_t count;
if ((STM32_USB->EPR[ep] & EPR_STAT_RX_MASK) != EPR_STAT_RX_NAK)
return 0;
udp = USB_GET_DESCRIPTOR(ep);
pmap = USB_ADDR2PTR(udp->RXADDR);
count = udp->RXCOUNT & RXCOUNT_COUNT_MASK;
if (n > count)
n = count;
count = (n + 1) / 2;
while (count) {
*(uint16_t *)buf = (uint16_t)*pmap++;
buf += 2;
count--;
}
EPR_SET_STAT_RX(ep, EPR_STAT_RX_VALID);
return n;
}
/**
* @brief Returns the number of bytes writeable to the transmit packet
* buffer.
*
* @param[in] usbp pointer to the @p USBDriver object
* @param[in] ep endpoint number
* @return The number of bytes that can be written.
* @retval 0 Endpoint not ready for transmission.
*
* @iclass
*/
size_t usb_lld_get_writeable(USBDriver *usbp, usbep_t ep) {
if ((STM32_USB->EPR[ep] & EPR_STAT_TX_MASK) != EPR_STAT_TX_NAK)
return 0;
return (size_t)usbp->usb_epc[ep]->uepc_in_maxsize;
}
/**
* @brief Endpoint write.
* @details The user data is copied in the packer memory and then
* the endpoint is brought to the valid state in order to allow
* transmission.
*
* @param[in] usbp pointer to the @p USBDriver object
* @param[in] ep endpoint number
* @param[in] buf buffer where to copy the endpoint data
* @param[in] n maximum number of bytes to copy
* @return The number of bytes that were effectively written.
* @retval 0 Endpoint not ready for transmission.
*
* @notapi
*/
size_t usb_lld_write(USBDriver *usbp, usbep_t ep,
const uint8_t *buf,
size_t n) {
uint32_t *pmap;
stm32_usb_descriptor_t *udp;
size_t count;
if ((STM32_USB->EPR[ep] & EPR_STAT_TX_MASK) != EPR_STAT_TX_NAK)
return 0;
udp = USB_GET_DESCRIPTOR(ep);
pmap = USB_ADDR2PTR(udp->TXADDR);
udp->TXCOUNT = n;
count = (n + 1) / 2;
while (count) {
*pmap++ = *(uint16_t *)buf;
buf += 2;
count--;
}
EPR_SET_STAT_TX(ep, EPR_STAT_TX_VALID);
return n;
}
/**
* @brief Returns the status of an IN endpoint.
*
* @param[in] usbp pointer to the @p USBDriver object
* @param[in] ep endpoint number
*
* @notapi
*/
usbepstatus_t usb_lld_get_status_in(USBDriver *usbp, usbep_t ep) {
switch (STM32_USB->EPR[ep] & EPR_STAT_TX_MASK) {
case EPR_STAT_TX_DIS:
return EP_STATUS_DISABLED;
case EPR_STAT_TX_STALL:
return EP_STATUS_STALLED;
default:
return EP_STATUS_ACTIVE;
}
}
/**
* @brief Returns the status of an OUT endpoint.
*
* @param[in] usbp pointer to the @p USBDriver object
* @param[in] ep endpoint number
*
* @notapi
*/
usbepstatus_t usb_lld_get_status_out(USBDriver *usbp, usbep_t ep) {
switch (STM32_USB->EPR[ep] & EPR_STAT_RX_MASK) {
case EPR_STAT_RX_DIS:
return EP_STATUS_DISABLED;
case EPR_STAT_RX_STALL:
return EP_STATUS_STALLED;
default:
return EP_STATUS_ACTIVE;
}
}
/**
* @brief Brings an IN endpoint in the stalled state.
*
* @param[in] usbp pointer to the @p USBDriver object
* @param[in] ep endpoint number
*
* @notapi
*/
void usb_lld_stall_in(USBDriver *usbp, usbep_t ep) {
EPR_SET_STAT_TX(ep, EPR_STAT_TX_STALL);
}
/**
* @brief Brings an OUT endpoint in the stalled state.
*
* @param[in] usbp pointer to the @p USBDriver object
* @param[in] ep endpoint number
*
* @notapi
*/
void usb_lld_stall_out(USBDriver *usbp, usbep_t ep) {
EPR_SET_STAT_RX(ep, EPR_STAT_RX_STALL);
}
/**
* @brief Brings an IN endpoint in the active state.
*
* @param[in] usbp pointer to the @p USBDriver object
* @param[in] ep endpoint number
*
* @notapi
*/
void usb_lld_clear_in(USBDriver *usbp, usbep_t ep) {
/* Makes sure to not put to NAK an endpoint that is already
transferring.*/
if ((STM32_USB->EPR[ep] & EPR_STAT_TX_MASK) != EPR_STAT_TX_VALID)
EPR_SET_STAT_TX(ep, EPR_STAT_TX_NAK);
}
/**
* @brief Brings an OUT endpoint in the active state.
*
* @param[in] usbp pointer to the @p USBDriver object
* @param[in] ep endpoint number
*
* @notapi
*/
void usb_lld_clear_out(USBDriver *usbp, usbep_t ep) {
/* Makes sure to not put to NAK an endpoint that is already
transferring.*/
if ((STM32_USB->EPR[ep] & EPR_STAT_RX_MASK) != EPR_STAT_RX_VALID)
EPR_SET_STAT_TX(ep, EPR_STAT_RX_NAK);
}
#endif /* HAL_USE_USB */
/** @} */
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