[参考译文] TMS570LC4357：LwIP 示例在 HDK 上不起作用

 在 给 TMS570LC4357 HDK (或 Launchpad)上电后、我在 hdkif_hw_init ()中遇到了相同的故障。

在 hdkif_hw_init()中， 通过从以下位置进行更改来添加一个__delay_cycles()调用：

  EMACInit(hdkif->emac_ctrl_base, hdkif->emac_base);

  MDIOInit(hdkif->mdio_base, MDIO_FREQ_INPUT, MDIO_FREQ_OUTPUT);
  while(delay--);

至：

  EMACInit(hdkif->emac_ctrl_base, hdkif->emac_base);

  /* Wait at least 167 milliseconds with the MDIO signal to the DP83630 PHY pulled-up with hardware before initialising
   * the MDIO interfaces.
   *
   * The DP83630 PHY datasheet parameters T2.1.1 "Post Power Up Stabilization time prior to MDC preamble for register
   * accesses" T2.1.2 "Hardware Configuration Latch-in Time from power up" parameters are both 167 milliseconds.
   *
   * Without this delay, on both a TMS570LC43x HDK and LAUNCHXL2-570LC43 after a powerup the Dp83640IDGet() function
   * failed to read the Phy ID.
   */
  __delay_cycles (PLL1_FREQ * 167000);

  MDIOInit(hdkif->mdio_base, MDIO_FREQ_INPUT, MDIO_FREQ_OUTPUT);
  while(delay--);

使代码可靠