/* * usb-st-common.c - USB driver common part for STM chips. * * Copyright (C) 2016, 2017, 2018 Flying Stone Technology * Author: NIIBE Yutaka * * This file is a part of Chopstx, a thread library for embedded. * * Chopstx 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. * * Chopstx 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 . * * As additional permission under GNU GPL version 3 section 7, you may * distribute non-source form of the Program without the copy of the * GNU GPL normally required by section 4, provided you inform the * recipients of GNU GPL by a written offer. * */ struct USB { volatile uint32_t EPR[8]; volatile uint32_t reserved[8]; volatile uint16_t CNTR; /* Control register */ volatile uint16_t reserved0; volatile uint16_t ISTR; /* Interrupt status register */ volatile uint16_t reserved1; volatile uint16_t FNR; /* Frame number register */ volatile uint16_t reserved2; volatile uint16_t DADDR; /* Device address register */ volatile uint16_t reserved3; volatile uint16_t BTABLE; /* Buffer Table address register */ volatile uint16_t reserved4; }; static struct USB *const USB = (struct USB *)REG_BASE; #define ISTR_CTR (0x8000) /* Correct TRansfer (read-only bit) */ #define ISTR_OVR (0x4000) /* OVeR/underrun (clear-only bit) */ #define ISTR_ERR (0x2000) /* ERRor (clear-only bit) */ #define ISTR_WKUP (0x1000) /* WaKe UP (clear-only bit) */ #define ISTR_SUSP (0x0800) /* SUSPend (clear-only bit) */ #define ISTR_RESET (0x0400) /* RESET (clear-only bit) */ #define ISTR_SOF (0x0200) /* Start Of Frame (clear-only bit) */ #define ISTR_ESOF (0x0100) /* Expected Start Of Frame (clear-only bit) */ #define ISTR_DIR (0x0010) /* DIRection of transaction (read-only bit) */ #define ISTR_EP_ID (0x000F) /* EndPoint IDentifier (read-only bit) */ #define CLR_SOF (~ISTR_SOF) /* clear Start Of Frame bit */ #define CLR_ESOF (~ISTR_ESOF) /* clear Expected Start Of Frame bit */ #define CNTR_CTRM (0x8000) /* Correct TRansfer Mask */ #define CNTR_OVRM (0x4000) /* OVeR/underrun Mask */ #define CNTR_ERRM (0x2000) /* ERRor Mask */ #define CNTR_WKUPM (0x1000) /* WaKe UP Mask */ #define CNTR_SUSPM (0x0800) /* SUSPend Mask */ #define CNTR_RESETM (0x0400) /* RESET Mask */ #define CNTR_SOFM (0x0200) /* Start Of Frame Mask */ #define CNTR_ESOFM (0x0100) /* Expected Start Of Frame Mask */ #define CNTR_RESUME (0x0010) /* RESUME request */ #define CNTR_FSUSP (0x0008) /* Force SUSPend */ #define CNTR_LPMODE (0x0004) /* Low-power MODE */ #define CNTR_PDWN (0x0002) /* Power DoWN */ #define CNTR_FRES (0x0001) /* Force USB RESet */ #define DADDR_EF (0x80) #define DADDR_ADD (0x7F) #define EP_CTR_RX (0x8000) /* EndPoint Correct TRansfer RX (clear-only) */ #define EP_DTOG_RX (0x4000) /* EndPoint Data TOGGLE RX (toggle) */ #define EPRX_STAT (0x3000) /* EndPoint RX STATus bit field (toggle) */ #define EP_SETUP (0x0800) /* EndPoint SETUP (read-only) */ #define EP_T_FIELD (0x0600) /* EndPoint TYPE */ #define EP_KIND (0x0100) /* EndPoint KIND */ #define EP_CTR_TX (0x0080) /* EndPoint Correct TRansfer TX (clear-only) */ #define EP_DTOG_TX (0x0040) /* EndPoint Data TOGGLE TX (toggle) */ #define EPTX_STAT (0x0030) /* EndPoint TX STATus bit field (toggle) */ #define EPADDR_FIELD (0x000F) /* EndPoint ADDRess FIELD */ #define EPREG_MASK (EP_CTR_RX|EP_SETUP|EP_T_FIELD|EP_KIND|EP_CTR_TX|EPADDR_FIELD) /* STAT_TX[1:0] STATus for TX transfer */ #define EP_TX_DIS (0x0000) /* EndPoint TX DISabled */ #define EP_TX_STALL (0x0010) /* EndPoint TX STALLed */ #define EP_TX_NAK (0x0020) /* EndPoint TX NAKed */ #define EP_TX_VALID (0x0030) /* EndPoint TX VALID */ #define EPTX_DTOG1 (0x0010) /* EndPoint TX Data TOGgle bit1 */ #define EPTX_DTOG2 (0x0020) /* EndPoint TX Data TOGgle bit2 */ /* STAT_RX[1:0] STATus for RX transfer */ #define EP_RX_DIS (0x0000) /* EndPoint RX DISabled */ #define EP_RX_STALL (0x1000) /* EndPoint RX STALLed */ #define EP_RX_NAK (0x2000) /* EndPoint RX NAKed */ #define EP_RX_VALID (0x3000) /* EndPoint RX VALID */ #define EPRX_DTOG1 (0x1000) /* EndPoint RX Data TOGgle bit1 */ #define EPRX_DTOG2 (0x2000) /* EndPoint RX Data TOGgle bit1 */ static int handle_setup0 (struct usb_dev *dev); static int usb_handle_transfer (struct usb_dev *dev, uint16_t istr_value); /* Clear CTR_RX bit by writing the 0-bit, keeping rw bits and toggle bits. */ static void ep_clear_ctr_rx (uint8_t ep_num) { uint16_t value = USB->EPR[ep_num] & ~EP_CTR_RX & EPREG_MASK; USB->EPR[ep_num] = value; } /* Clear CTR_TX bit by writing the 0-bit, keeping rw bits and toggle bits. */ static void ep_clear_ctr_tx (uint8_t ep_num) { uint16_t value = USB->EPR[ep_num] & ~EP_CTR_TX & EPREG_MASK; USB->EPR[ep_num] = value; } static void ep_set_rxtx_status (uint8_t ep_num, uint16_t st_rx, uint16_t st_tx) { uint16_t value = USB->EPR[ep_num]; value &= (EPREG_MASK|EPRX_STAT|EPTX_STAT); value ^= (EPRX_DTOG1 & st_rx); value ^= (EPRX_DTOG2 & st_rx); value ^= (EPTX_DTOG1 & st_tx); value ^= (EPTX_DTOG2 & st_tx); value |= EP_CTR_RX | EP_CTR_TX; USB->EPR[ep_num] = value; } static void ep_set_rx_status (uint8_t ep_num, uint16_t st_rx) { uint16_t value = USB->EPR[ep_num]; value &= (EPREG_MASK|EPRX_STAT); value ^= (EPRX_DTOG1 & st_rx); value ^= (EPRX_DTOG2 & st_rx); value |= EP_CTR_RX | EP_CTR_TX; USB->EPR[ep_num] = value; } static uint16_t ep_get_rx_status (uint8_t ep_num) { uint16_t value = USB->EPR[ep_num]; return value & EPRX_STAT; } static void ep_set_tx_status (uint8_t ep_num, uint16_t st_tx) { uint16_t value = USB->EPR[ep_num]; value &= (EPREG_MASK|EPTX_STAT); value ^= (EPTX_DTOG1 & st_tx); value ^= (EPTX_DTOG2 & st_tx); value |= EP_CTR_RX | EP_CTR_TX; USB->EPR[ep_num] = value; } static uint16_t ep_get_tx_status (uint8_t ep_num) { uint16_t value = USB->EPR[ep_num]; return value & EPTX_STAT; } static void ep_clear_dtog_rx (uint8_t ep_num) { uint16_t value = USB->EPR[ep_num]; if ((value & EP_DTOG_RX)) { value &= EPREG_MASK; value |= EP_CTR_RX | EP_CTR_TX | EP_DTOG_RX; USB->EPR[ep_num] = value; } } static void ep_clear_dtog_tx (uint8_t ep_num) { uint16_t value = USB->EPR[ep_num]; if ((value & EP_DTOG_TX)) { value &= EPREG_MASK; value |= EP_CTR_RX | EP_CTR_TX | EP_DTOG_TX; USB->EPR[ep_num] = value; } } void usb_lld_ctrl_error (struct usb_dev *dev) { dev->state = STALLED; ep_set_rxtx_status (ENDP0, EP_RX_STALL, EP_TX_STALL); } int usb_lld_ctrl_ack (struct usb_dev *dev) { dev->state = WAIT_STATUS_IN; epbuf_set_tx_count (ENDP0, 0); ep_set_rxtx_status (ENDP0, EP_RX_NAK, EP_TX_VALID); return USB_EVENT_OK; } void usb_lld_init (struct usb_dev *dev, uint8_t feature) { usb_lld_init_chip_specific (); dev->configuration = 0; dev->feature = feature; dev->state = WAIT_SETUP; /* Reset USB */ USB->CNTR = CNTR_FRES; USB->CNTR = 0; USB->BTABLE = 0; /* Clear Interrupt Status Register, and enable interrupt for USB */ USB->ISTR = 0; USB->CNTR = (CNTR_CTRM | CNTR_OVRM | CNTR_ERRM | CNTR_WKUPM | CNTR_SUSPM | CNTR_RESETM); } void usb_lld_prepare_shutdown (void) { USB->ISTR = 0; USB->CNTR = 0; } void usb_lld_shutdown (void) { USB->CNTR = CNTR_PDWN; usb_lld_shutdown_chip_specific (); } #define USB_MAKE_EV(event) (event<<24) #define USB_MAKE_TXRX(ep_num,txrx,len) ((txrx? (1<<23):0)|(ep_num<<16)|len) int usb_lld_event_handler (struct usb_dev *dev) { uint16_t istr_value = USB->ISTR; if ((istr_value & ISTR_RESET)) { USB->ISTR = ~ISTR_RESET; /* clear RESET bit */ return USB_MAKE_EV (USB_EVENT_DEVICE_RESET); } else if ((istr_value & ISTR_WKUP)) { USB->CNTR &= ~CNTR_FSUSP; USB->ISTR = ~ISTR_WKUP; /* clear WaKe UP bit */ return USB_MAKE_EV (USB_EVENT_DEVICE_WAKEUP); } else if ((istr_value & ISTR_SUSP)) { USB->CNTR |= CNTR_FSUSP; USB->ISTR = ~ISTR_SUSP; /* clear SUSPend bit */ USB->CNTR |= CNTR_LPMODE; return USB_MAKE_EV (USB_EVENT_DEVICE_SUSPEND); } else { if ((istr_value & ISTR_OVR)) USB->ISTR = ~ISTR_OVR; /* clear OVeR/underrun bit */ if ((istr_value & ISTR_ERR)) USB->ISTR = ~ISTR_ERR; /* clear ERRor bit */ if ((istr_value & ISTR_CTR)) return usb_handle_transfer (dev, istr_value); } return USB_EVENT_OK; } static void handle_datastage_out (struct usb_dev *dev) { if (dev->ctrl_data.addr && dev->ctrl_data.len) { uint16_t len = epbuf_get_rx_count (ENDP0); if (len > dev->ctrl_data.len) len = dev->ctrl_data.len; usb_lld_from_pmabuf (dev->ctrl_data.addr, epbuf_get_rx_addr (ENDP0), len); dev->ctrl_data.len -= len; dev->ctrl_data.addr += len; } if (dev->ctrl_data.len == 0) { dev->state = WAIT_STATUS_IN; epbuf_set_tx_count (ENDP0, 0); ep_set_tx_status (ENDP0, EP_TX_VALID); } else { dev->state = OUT_DATA; ep_set_rx_status (ENDP0, EP_RX_VALID); } } static void handle_datastage_in (struct usb_dev *dev) { uint32_t len = USB_MAX_PACKET_SIZE; struct ctrl_data *data_p = &dev->ctrl_data; if ((data_p->len == 0) && (dev->state == LAST_IN_DATA)) { if (data_p->require_zlp) { data_p->require_zlp = 0; /* No more data to send. Send empty packet */ epbuf_set_tx_count (ENDP0, 0); ep_set_tx_status (ENDP0, EP_TX_VALID); } else { /* No more data to send, proceed to receive OUT acknowledge. */ dev->state = WAIT_STATUS_OUT; ep_set_rx_status (ENDP0, EP_RX_VALID); } return; } dev->state = (data_p->len <= len) ? LAST_IN_DATA : IN_DATA; if (len > data_p->len) len = data_p->len; usb_lld_to_pmabuf (data_p->addr, epbuf_get_tx_addr (ENDP0), len); data_p->len -= len; data_p->addr += len; epbuf_set_tx_count (ENDP0, len); ep_set_tx_status (ENDP0, EP_TX_VALID); } typedef int (*HANDLER) (struct usb_dev *dev); static int std_none (struct usb_dev *dev) { (void)dev; return -1; } static int std_get_status (struct usb_dev *dev) { struct device_req *arg = &dev->dev_req; uint8_t rcp = (arg->type & RECIPIENT); uint16_t status_info = 0; if (arg->value != 0 || arg->len != 2 || (arg->index >> 8) != 0 || USB_SETUP_SET (arg->type)) return -1; if (rcp == DEVICE_RECIPIENT) { if (arg->index == 0) { /* Get Device Status */ uint8_t feature = dev->feature; /* Remote Wakeup enabled */ if ((feature & (1 << 5))) status_info |= 2; else status_info &= ~2; /* Bus-powered */ if ((feature & (1 << 6))) status_info |= 1; else /* Self-powered */ status_info &= ~1; return usb_lld_ctrl_send (dev, &status_info, 2); } } else if (rcp == INTERFACE_RECIPIENT) { if (dev->configuration == 0) return -1; return USB_EVENT_GET_STATUS_INTERFACE; } else if (rcp == ENDPOINT_RECIPIENT) { uint8_t endpoint = (arg->index & 0x0f); uint16_t status; if ((arg->index & 0x70) || endpoint == ENDP0) return -1; if ((arg->index & 0x80)) { status = ep_get_tx_status (endpoint); if (status == 0) /* Disabled */ return -1; else if (status == EP_TX_STALL) status_info |= 1; /* IN Endpoint stalled */ } else { status = ep_get_rx_status (endpoint); if (status == 0) /* Disabled */ return -1; else if (status == EP_RX_STALL) status_info |= 1; /* OUT Endpoint stalled */ } return usb_lld_ctrl_send (dev, &status_info, 2); } return -1; } static int std_clear_feature (struct usb_dev *dev) { struct device_req *arg = &dev->dev_req; uint8_t rcp = arg->type & RECIPIENT; if (USB_SETUP_GET (arg->type)) return -1; if (rcp == DEVICE_RECIPIENT) { if (arg->len != 0 || arg->index != 0) return -1; if (arg->value == FEATURE_DEVICE_REMOTE_WAKEUP) { dev->feature &= ~(1 << 5); return USB_EVENT_CLEAR_FEATURE_DEVICE; } } else if (rcp == ENDPOINT_RECIPIENT) { uint8_t endpoint = (arg->index & 0x0f); uint16_t status; if (dev->configuration == 0) return -1; if (arg->len != 0 || (arg->index >> 8) != 0 || arg->value != FEATURE_ENDPOINT_HALT || endpoint == ENDP0) return -1; if ((arg->index & 0x80)) status = ep_get_tx_status (endpoint); else status = ep_get_rx_status (endpoint); if (status == 0) /* It's disabled endpoint. */ return -1; if (arg->index & 0x80) /* IN endpoint */ ep_clear_dtog_tx (endpoint); else /* OUT endpoint */ ep_clear_dtog_rx (endpoint); return USB_EVENT_CLEAR_FEATURE_ENDPOINT; } return -1; } static int std_set_feature (struct usb_dev *dev) { struct device_req *arg = &dev->dev_req; uint8_t rcp = arg->type & RECIPIENT; if (USB_SETUP_GET (arg->type)) return -1; if (rcp == DEVICE_RECIPIENT) { if (arg->len != 0 || arg->index != 0) return -1; if (arg->value == FEATURE_DEVICE_REMOTE_WAKEUP) { dev->feature |= 1 << 5; return USB_EVENT_SET_FEATURE_DEVICE; } } else if (rcp == ENDPOINT_RECIPIENT) { uint8_t endpoint = (arg->index & 0x0f); uint32_t status; if (dev->configuration == 0) return -1; if (arg->len != 0 || (arg->index >> 8) != 0 || arg->value != FEATURE_ENDPOINT_HALT || endpoint == ENDP0) return -1; if ((arg->index & 0x80)) status = ep_get_tx_status (endpoint); else status = ep_get_rx_status (endpoint); if (status == 0) /* It's disabled endpoint. */ return -1; if (arg->index & 0x80) /* IN endpoint */ ep_set_tx_status (endpoint, EP_TX_STALL); else /* OUT endpoint */ ep_set_rx_status (endpoint, EP_RX_STALL); return USB_EVENT_SET_FEATURE_ENDPOINT; } return -1; } static int std_set_address (struct usb_dev *dev) { struct device_req *arg = &dev->dev_req; uint8_t rcp = arg->type & RECIPIENT; if (USB_SETUP_GET (arg->type)) return -1; if (rcp == DEVICE_RECIPIENT && arg->len == 0 && arg->value <= 127 && arg->index == 0 && dev->configuration == 0) return usb_lld_ctrl_ack (dev); return -1; } static int std_get_descriptor (struct usb_dev *dev) { struct device_req *arg = &dev->dev_req; if (USB_SETUP_SET (arg->type)) return -1; return USB_EVENT_GET_DESCRIPTOR; } static int std_get_configuration (struct usb_dev *dev) { struct device_req *arg = &dev->dev_req; uint8_t rcp = arg->type & RECIPIENT; if (USB_SETUP_SET (arg->type)) return -1; if (arg->value != 0 || arg->index != 0 || arg->len != 1) return -1; if (rcp == DEVICE_RECIPIENT) return usb_lld_ctrl_send (dev, &dev->configuration, 1); return -1; } static int std_set_configuration (struct usb_dev *dev) { struct device_req *arg = &dev->dev_req; uint8_t rcp = arg->type & RECIPIENT; if (USB_SETUP_GET (arg->type)) return -1; if (arg->index != 0 || arg->len != 0) return -1; if (rcp == DEVICE_RECIPIENT) return USB_EVENT_SET_CONFIGURATION; return -1; } static int std_get_interface (struct usb_dev *dev) { struct device_req *arg = &dev->dev_req; uint8_t rcp = arg->type & RECIPIENT; if (USB_SETUP_SET (arg->type)) return -1; if (arg->value != 0 || (arg->index >> 8) != 0 || arg->len != 1) return -1; if (dev->configuration == 0) return -1; if (rcp == INTERFACE_RECIPIENT) return USB_EVENT_GET_INTERFACE; return -1; } static int std_set_interface (struct usb_dev *dev) { struct device_req *arg = &dev->dev_req; uint8_t rcp = arg->type & RECIPIENT; if (USB_SETUP_GET (arg->type) || rcp != INTERFACE_RECIPIENT || arg->len != 0 || (arg->index >> 8) != 0 || (arg->value >> 8) != 0 || dev->configuration == 0) return -1; return USB_EVENT_SET_INTERFACE; } static int handle_in0 (struct usb_dev *dev) { int r = 0; if (dev->state == IN_DATA || dev->state == LAST_IN_DATA) handle_datastage_in (dev); else if (dev->state == WAIT_STATUS_IN) { dev->state = WAIT_SETUP; if ((dev->dev_req.request == SET_ADDRESS) && ((dev->dev_req.type & (REQUEST_TYPE | RECIPIENT)) == (STANDARD_REQUEST | DEVICE_RECIPIENT))) { USB->DADDR = (DADDR_EF | dev->dev_req.value); r = USB_EVENT_DEVICE_ADDRESSED; } else r = USB_EVENT_CTRL_WRITE_FINISH; } else { dev->state = STALLED; ep_set_rxtx_status (ENDP0, EP_RX_STALL, EP_TX_STALL); } return r; } static void handle_out0 (struct usb_dev *dev) { if (dev->state == OUT_DATA) /* Usual case. */ handle_datastage_out (dev); else if (dev->state == WAIT_STATUS_OUT) /* * Control READ transfer finished by ZLP. * Leave ENDP0 status RX_NAK, TX_NAK. */ dev->state = WAIT_SETUP; else { /* * dev->state == IN_DATA || dev->state == LAST_IN_DATA * (Host aborts the transfer before finish) * Or else, unexpected state. * STALL the endpoint, until we receive the next SETUP token. */ dev->state = STALLED; ep_set_rxtx_status (ENDP0, EP_RX_STALL, EP_TX_STALL); } } static int usb_handle_transfer (struct usb_dev *dev, uint16_t istr_value) { uint16_t ep_value = 0; uint8_t ep_num = (istr_value & ISTR_EP_ID); ep_value = USB->EPR[ep_num]; if (ep_num == 0) { if ((ep_value & EP_CTR_TX)) { ep_clear_ctr_tx (ep_num); return USB_MAKE_EV (handle_in0 (dev)); } if ((ep_value & EP_CTR_RX)) { ep_clear_ctr_rx (ep_num); if ((ep_value & EP_SETUP)) return USB_MAKE_EV (handle_setup0 (dev)); else { handle_out0 (dev); return USB_EVENT_OK; } } } else { uint16_t len; if ((ep_value & EP_CTR_RX)) { len = epbuf_get_rx_count (ep_num); ep_clear_ctr_rx (ep_num); return USB_MAKE_TXRX (ep_num, 0, len); } if ((ep_value & EP_CTR_TX)) { len = epbuf_get_tx_count (ep_num); ep_clear_ctr_tx (ep_num); return USB_MAKE_TXRX (ep_num, 1, len); } } return USB_EVENT_OK; } void usb_lld_reset (struct usb_dev *dev, uint8_t feature) { usb_lld_set_configuration (dev, 0); dev->feature = feature; USB->DADDR = DADDR_EF; /* Initially, device responds to address 0 */ } void usb_lld_txcpy (const void *src, int ep_num, int offset, size_t len) { usb_lld_to_pmabuf (src, epbuf_get_tx_addr (ep_num) + offset, len); } void usb_lld_write (uint8_t ep_num, const void *buf, size_t len) { usb_lld_to_pmabuf (buf, epbuf_get_tx_addr (ep_num), len); epbuf_set_tx_count (ep_num, len); ep_set_tx_status (ep_num, EP_TX_VALID); } void usb_lld_rxcpy (uint8_t *dst, int ep_num, int offset, size_t len) { usb_lld_from_pmabuf (dst, epbuf_get_rx_addr (ep_num) + offset, len); } void usb_lld_tx_enable (int ep_num, size_t len) { epbuf_set_tx_count (ep_num, len); ep_set_tx_status (ep_num, EP_TX_VALID); } void usb_lld_stall_tx (int ep_num) { ep_set_tx_status (ep_num, EP_TX_STALL); } void usb_lld_stall_rx (int ep_num) { ep_set_rx_status (ep_num, EP_RX_STALL); } void usb_lld_rx_enable (int ep_num) { ep_set_rx_status (ep_num, EP_RX_VALID); } void usb_lld_setup_endpoint (int ep_num, int ep_type, int ep_kind, int ep_rx_addr, int ep_tx_addr, int ep_rx_buf_size) { uint16_t epreg_value = USB->EPR[ep_num]; uint16_t ep_rxtx_status = 0; /* Both disabled */ /* Clear: Write 1 if 1: EP_DTOG_RX, EP_DTOG_TX */ /* Set: Write: EP_T_FIELD, EP_KIND, EPADDR_FIELD */ /* Set: Toggle: EPRX_STAT, EPTX_STAT */ epreg_value &= (EPRX_STAT | EP_SETUP | EPTX_STAT | EP_DTOG_RX | EP_DTOG_TX); #if USB_KEEP_CORRECT_TRANSFER_FLAGS /* Keep: Write 1: EP_CTR_RX, EP_CTR_TX */ epreg_value |= (EP_CTR_RX|EP_CTR_TX); #else /* Clear: Write 0: EP_CTR_RX, EP_CTR_TX */ #endif epreg_value |= ep_type; epreg_value |= ep_kind; epreg_value |= ep_num; if (ep_rx_addr) { ep_rxtx_status |= EP_RX_NAK; epbuf_set_rx_addr (ep_num, ep_rx_addr); epbuf_set_rx_buf_size (ep_num, ep_rx_buf_size); } if (ep_tx_addr) { ep_rxtx_status |= EP_TX_NAK; epbuf_set_tx_addr (ep_num, ep_tx_addr); } epreg_value ^= (EPRX_DTOG1 & ep_rxtx_status); epreg_value ^= (EPRX_DTOG2 & ep_rxtx_status); epreg_value ^= (EPTX_DTOG1 & ep_rxtx_status); epreg_value ^= (EPTX_DTOG2 & ep_rxtx_status); USB->EPR[ep_num] = epreg_value; } void usb_lld_set_configuration (struct usb_dev *dev, uint8_t config) { dev->configuration = config; } uint8_t usb_lld_current_configuration (struct usb_dev *dev) { return dev->configuration; } int usb_lld_ctrl_recv (struct usb_dev *dev, void *p, size_t len) { struct ctrl_data *data_p = &dev->ctrl_data; data_p->addr = p; data_p->len = len; dev->state = OUT_DATA; ep_set_rx_status (ENDP0, EP_RX_VALID); return USB_EVENT_OK; } /* * BUF: Pointer to data memory. Data memory should not be allocated * on stack when BUFLEN > USB_MAX_PACKET_SIZE. * * BUFLEN: size of the data. */ int usb_lld_ctrl_send (struct usb_dev *dev, const void *buf, size_t buflen) { struct ctrl_data *data_p = &dev->ctrl_data; uint32_t len_asked = dev->dev_req.len; uint32_t len; data_p->addr = (void *)buf; data_p->len = buflen; /* Restrict the data length to be the one which host asks for. */ if (data_p->len >= len_asked) data_p->len = len_asked; /* ZLP is only required when host doesn't expect the end of packets. */ else if (data_p->len != 0 && (data_p->len % USB_MAX_PACKET_SIZE) == 0) data_p->require_zlp = 1; if (data_p->len <= USB_MAX_PACKET_SIZE) { len = data_p->len; dev->state = LAST_IN_DATA; } else { len = USB_MAX_PACKET_SIZE; dev->state = IN_DATA; } if (len) { usb_lld_to_pmabuf (data_p->addr, epbuf_get_tx_addr (ENDP0), len); data_p->len -= len; data_p->addr += len; } epbuf_set_tx_count (ENDP0, len); ep_set_rxtx_status (ENDP0, EP_RX_NAK, EP_TX_VALID); return USB_EVENT_OK; }