请教下，使用 tftp 升级固件，获取数据失败？

hpdell · 发表于 2017-12-16 14:35:38

本帖最后由 hpdell 于 2017-12-16 14:43 编辑

请教下，使用tftP 升级固件，数据发送返回错误？

有谁知道是怎么回事莫？？

使用 http 更新固件，完全正常

static void IAP_tftp_recv_callback(void *arg, struct udp_pcb *upcb, struct pbuf *pkt_buf,
                     const ip_addr_t *addr, u16_t port)
{
  tftp_opcode op;
  struct udp_pcb *upcb_tftp_data;
  err_t err;

  uint32_t i;
  char filename[40],message[40], *ptr;

  /* create new UDP PCB structure */
  upcb_tftp_data = udp_new();
  if (!upcb_tftp_data)
  {
/* Error creating PCB. Out of Memory  */

printf("Can not create pcb 1\r\n");
__LTDC_drv->LTDC_DispStringAt(12, 180,
                              LCD_COLOR_RED,
                              LCD_COLOR_WHITE,
                              &FontAscii8x16,
                           (const uint8_t *)"Can not create pcb 1");
return;
  }

  /* bind to port 0 to receive next available free port */
  /* NOTE:  This is how TFTP works.  There is a UDP PCB for the standard port
  * 69 which al transactions begin communication on, however, _all_ subsequent
  * transactions for a given "stream" occur on another port  */
  err = udp_bind(upcb_tftp_data, IP_ADDR_ANY, 0);
  if (err != ERR_OK)
  {
/* Unable to bind to port */

printf("Can not create pcb 2\r\n");
__LTDC_drv->LTDC_DispStringAt(12, 200,
                              LCD_COLOR_RED,
                              LCD_COLOR_WHITE,
                              &FontAscii8x16,
                           (const uint8_t *)"Can not create pcb 2");
return;
  }

  op = IAP_tftp_decode_op(pkt_buf->payload);
  if (op != TFTP_WRQ) // op 实际返回的值为 1，而这个 TFTP_WRQ 定义的为2 ，
  {
/* remove PCB */

printf("Bad TFTP opcode \r\n");                   // 问题就出在这里了？？？？？？？？？？？？？？？？？？？？？
__LTDC_drv->LTDC_DispStringAt(12, 200,
                              LCD_COLOR_RED,
                              LCD_COLOR_WHITE,
                              &FontAscii8x16,
                           (const uint8_t *)"Bad TFTP opcode");
udp_remove(upcb_tftp_data);
  }
  else
  {

ptr = pkt_buf->payload;
ptr = ptr +2;
// extract file name info
i= 0;
while (*(ptr+i)!=0x0)
{
   i++;
}
strncpy(filename, ptr, i+1);

printf("IAP using TFTP \r\n");

__LTDC_drv->LTDC_DispStringAt(12, 220,
                              LCD_COLOR_RED,
                              LCD_COLOR_WHITE,
                              &FontAscii8x16,
                           (const uint8_t *)"IAP using TFTP");

sprintf(message, "File: %s",filename);

printf("State: Erasing...\r\n");
__LTDC_drv->LTDC_DispStringAt(12, 240,
                              LCD_COLOR_RED,
                              LCD_COLOR_WHITE,
                              &FontAscii8x16,
                           (const uint8_t *)message);

__LTDC_drv->LTDC_DispStringAt(12, 260,
                              LCD_COLOR_RED,
                              LCD_COLOR_WHITE,
                              &FontAscii8x16,
                           (const uint8_t *)"State: Erasing...");

// Start the TFTP write mode
IAP_tftp_process_write(upcb_tftp_data, addr, port);
  }
  pbuf_free(pkt_buf);
}

/**
  * @brief Returns the TFTP opcode
  * @param buf: pointer on the TFTP packet
  * @retval None
  */
static tftp_opcode IAP_tftp_decode_op(char *buf)
{
  return (tftp_opcode)(buf[1]);
}