Posted on April 10, 2018 at 16:05I'm trying to to port the NetworkInterface.c to STM32H7
I'm following the instructions
provided for
https://www.freertos.org/FreeRTOS-Plus/FreeRTOS_Plus_TCP/Embedded_Ethernet_Porting.html
for other chips.
As for first step I'm interesting in implementing the simplest solution that do not involves using DMA.
BufferAllocation_2 is the selected network buffer scheme
I'm not sure how to use HAL libraries to implement
BaseType_t xNetworkInterfaceOutput( NetworkBufferDescriptor_t * const pxDescriptor, BaseType_t xReleaseAfterSend );
/**
* The network interface port layer must provide a function called xNetworkInterfaceOutput()
* that sends data received from the embedded TCP/IP stack to the Ethernet MAC driver for transmission.
*/
BaseType_t xNetworkInterfaceOutput(NetworkBufferDescriptor_t * const pxDescriptor, BaseType_t xReleaseAfterSend)
{
/* Simple network interfaces just use Ethernet peripheral driver library functions to copy
data from the FreeRTOS+TCP buffer into the peripheral driver's own buffer. */
&sharpif( ipconfigDRIVER_INCLUDED_TX_IP_CHECKSUM != 0 )
{
ProtocolPacket_t *pxPacket;
/* If the peripheral must calculate the checksum, it wants
the protocol checksum to have a value of zero. */
pxPacket = ( ProtocolPacket_t * ) ( pxDescriptor->pucEthernetBuffer );
if( pxPacket->xICMPPacket.xIPHeader.ucProtocol == ipPROTOCOL_ICMP )
{
pxPacket->xICMPPacket.xICMPHeader.usChecksum = ( uint16_t )0u;
}
}
&sharpendif
/* Copy
data from the FreeRTOS+TCP buffer into the peripheral driver's own buffer
The start of the data is located
by pxDescriptor->pucEthernetBuffer. The length of the data is located
by pxDescriptor->xDataLength.*/
/** --------------------------------------QUESTION---------------------------------------------
* HAL ETH Implementation
*
*
-----------------------------------------------------------------------------------------------------*/
/* Call the standard trace macro to log the send event. */
iptraceNETWORK_INTERFACE_TRANSMIT();
if( xReleaseAfterSend != pdFALSE )
{
/* It is assumed SendData() copies the data out of the FreeRTOS+TCP Ethernet
buffer. The Ethernet buffer is therefore no longer needed, and must be
freed for re-use. */
vReleaseNetworkBufferAndDescriptor( pxDescriptor );
}
return pdTRUE;
}
This is my first time with HAL and in this instance I'm finding difficulties understanding how I should proceed.
Thanks for any help or suggestion.
#freertos+tcp #hal-eth #freerots
