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#include "project.h"
/* Commands sent with wBlockNum == 0 as per ST implementation. */
#define CMD_SETADDR 0x21
#define CMD_ERASE 0x41
/* We need a special large control buffer for this device: */
static enum dfu_state usbdfu_state = STATE_DFU_IDLE;
static uint32_t sector_bases[] = {
0x08000000,
0x08004000,
0x08008000,
0x0800C000,
0x08010000,
0x08020000,
0x08040000,
0x08060000,
0x08080000,
0x080A0000,
0x080C0000,
0x080E0000,
};
#define N_SECTORS (sizeof(sector_bases)/sizeof(sector_bases[0]))
static struct {
uint8_t buf[sizeof (usbd_control_buffer)];
uint16_t len;
uint32_t addr;
uint16_t blocknum;
} prog;
const struct usb_dfu_descriptor dfu_function = {
.bLength = sizeof (struct usb_dfu_descriptor),
.bDescriptorType = DFU_FUNCTIONAL,
.bmAttributes = USB_DFU_CAN_DOWNLOAD | USB_DFU_WILL_DETACH,
.wDetachTimeout = 255,
.wTransferSize = 1024,
.bcdDFUVersion = 0x011A,
};
const struct usb_interface_descriptor dfu_iface = {
.bLength = USB_DT_INTERFACE_SIZE,
.bDescriptorType = USB_DT_INTERFACE,
.bInterfaceNumber = 0,
.bAlternateSetting = 0,
.bNumEndpoints = 0,
.bInterfaceClass = 0xFE, /* Device Firmware Upgrade */
.bInterfaceSubClass = 1,
.bInterfaceProtocol = 2,
/* The ST Microelectronics DfuSe application needs this string.
* The format isn't documented... */
.iInterface = 4,
.extra = &dfu_function,
.extralen = sizeof (dfu_function),
};
static uint8_t usbdfu_getstatus (usbd_device *usbd_dev, uint32_t *bwPollTimeout)
{
(void)usbd_dev;
switch (usbdfu_state) {
case STATE_DFU_DNLOAD_SYNC:
usbdfu_state = STATE_DFU_DNBUSY;
*bwPollTimeout = 100;
return DFU_STATUS_OK;
case STATE_DFU_MANIFEST_SYNC:
/* Device will reset when read is complete. */
usbdfu_state = STATE_DFU_MANIFEST;
return DFU_STATUS_OK;
default:
return DFU_STATUS_OK;
}
}
static void usbdfu_getstatus_complete (usbd_device *usbd_dev, struct usb_setup_data *req)
{
unsigned i;
(void)req;
(void)usbd_dev;
switch (usbdfu_state) {
case STATE_DFU_DNBUSY:
flash_unlock();
if (prog.blocknum == 0) {
switch (prog.buf[0]) {
case CMD_ERASE: {
uint32_t *dat = (uint32_t *) (prog.buf + 1);
for (i = 0; i < N_SECTORS; ++i) {
if (*dat == sector_bases[i])
flash_erase_sector (i, FLASH_CR_PROGRAM_X32);
}
}
/*Fall through*/
case CMD_SETADDR: {
uint32_t *dat = (uint32_t *) (prog.buf + 1);
prog.addr = *dat;
}
}
} else {
uint32_t baseaddr = prog.addr + ((prog.blocknum - 2) *
dfu_function.wTransferSize);
for (i = 0; i < prog.len; i += 4) {
uint32_t *dat = (uint32_t *) (prog.buf + i);
flash_program_word (baseaddr + i, *dat);
}
max7219_report_addr (baseaddr);
}
flash_lock();
/* Jump straight to dfuDNLOAD-IDLE, skipping dfuDNLOAD-SYNC. */
usbdfu_state = STATE_DFU_DNLOAD_IDLE;
return ;
case STATE_DFU_MANIFEST:
/* USB device must detach, we just reset... */
scb_reset_system();
return ; /* Will never return. */
default:
;
}
}
enum usbd_request_return_codes usbdfu_control_request (usbd_device *usbd_dev, struct usb_setup_data *req, uint8_t **buf,
uint16_t *len, usbd_control_complete_callback *complete)
{
if ((req->bmRequestType & 0x7F) != 0x21)
return USBD_REQ_NEXT_CALLBACK; /* Only accept class request. */
switch (req->bRequest) {
case DFU_DNLOAD:
if ((len == NULL) || (*len == 0)) {
usbdfu_state = STATE_DFU_MANIFEST_SYNC;
return USBD_REQ_HANDLED;
} else {
/* Copy download data for use on GET_STATUS. */
prog.blocknum = req->wValue;
prog.len = *len;
memcpy (prog.buf, *buf, *len);
usbdfu_state = STATE_DFU_DNLOAD_SYNC;
return USBD_REQ_HANDLED;
}
case DFU_CLRSTATUS:
/* Clear error and return to dfuIDLE. */
if (usbdfu_state == STATE_DFU_ERROR)
usbdfu_state = STATE_DFU_IDLE;
return USBD_REQ_HANDLED;
case DFU_ABORT:
/* Abort returns to dfuIDLE state. */
usbdfu_state = STATE_DFU_IDLE;
return USBD_REQ_HANDLED;
case DFU_UPLOAD:
/* Upload not supported for now. */
return USBD_REQ_NOTSUPP;
case DFU_GETSTATUS: {
uint32_t bwPollTimeout = 0; /* 24-bit integer in DFU class spec */
(*buf)[0] = usbdfu_getstatus (usbd_dev, &bwPollTimeout);
(*buf)[1] = bwPollTimeout & 0xFF;
(*buf)[2] = (bwPollTimeout >> 8) & 0xFF;
(*buf)[3] = (bwPollTimeout >> 16) & 0xFF;
(*buf)[4] = usbdfu_state;
(*buf)[5] = 0; /* iString not used here */
*len = 6;
*complete = usbdfu_getstatus_complete;
return USBD_REQ_HANDLED;
}
case DFU_GETSTATE:
/* Return state with no state transision. */
*buf[0] = usbdfu_state;
*len = 1;
return USBD_REQ_HANDLED;
}
return USBD_REQ_NEXT_CALLBACK;
}
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