H7的新版CMSIS-Driver以太网驱动全速94Mbps左右，比我之前修改的慢那么一丢丢

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白鹭hu|

楼主 | 2018-8-4 16:22 | 只看该作者回帖奖励

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以太网, ps, mb, driver, RAM

V7配套的CMSIS-Driver驱动，将对下面的两个函数做个条件编译，可以选择官方的，也可以选择我修正的。

下面是官方的，速度94Mbps
/**
  fn       int32_t ReadFrame (uint8_t *frame, uint32_t len)
  rief    Read data of received Ethernet frame.
  param[in] frame  Pointer to frame buffer for data to read into
  param[in] len Frame buffer length in bytes

eturn    number of data bytes read or execution status
               - value >= 0: number of data bytes read
               - value < 0: error occurred, value is execution status as defined with
ef execution_status
*/
static int32_t ReadFrame (uint8_t *frame, uint32_t len) {

  if ((frame == NULL) && (len != 0U)) {
/* Invalid parameters */
return ARM_DRIVER_ERROR_PARAMETER;
  }

  if ((Emac.flags & EMAC_FLAG_POWER) == 0U) {
/* Driver not yet powered */
return ARM_DRIVER_ERROR;
  }

  if ((frame != NULL) && (Emac.rx_buf.buffer != NULL)) {
memcpy (frame, Emac.rx_buf.buffer, len);
Emac.rx_buf.buffer = NULL;
  }
  /* Return block back to EMAC-DMA */
  HAL_ETH_BuildRxDescriptors (Emac.h);

  return (len);
}

/**
  fn       uint32_t GetRxFrameSize (void)
  rief    Get size of received Ethernet frame.

eturn    number of bytes in received frame
*/
static uint32_t GetRxFrameSize (void) {
  uint32_t len = 0;

  /* Clean and invalidate data cache */
  SCB_CleanInvalidateDCache();

  if(HAL_ETH_GetRxDataBuffer(Emac.h, &Emac.rx_buf) == HAL_OK) {
if (HAL_ETH_GetRxDataLength (Emac.h, &len) == HAL_OK) {
   return (len);
}
  }
  /* No data available */
  return (0);
}

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H7的新版CMSIS-Driver以太网驱动全速94Mbps左右，比我之前修改的慢那么一丢丢

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