Hello folks!
I have a STM32F746 MCU on my custom board and I'm trying to get the LwIP + FreeRTOS stack to work, especially the netconn tcp_echo_server example.
It's not a hardware related problem, because the same HW has been used on another board (STM32F2 and STM32F3) and everything works fine. It must be a software problem but I can't figure out what it is.
I simply generated the code with the STM32CubeIDE, copied the example from the repository and started the application. This worked on the other board (STM33F2 and STM33F3) but not in this one (STM32F746).
Looking at the example of the repository, there are some differences compared to the generated code, especially regarding the addressing of the DMA buffers as follow.
...._RAM.ld
/* GENERATED CODE */
MEMORY
{
RAM (xrw) : ORIGIN = 0x20000000, LENGTH = 320K
FLASH (rx) : ORIGIN = 0x08000000, LENGTH = 512K
}
/* EXAMPLE CODE */
MEMORY
{
RAM (xrw) : ORIGIN = 0x20000000, LENGTH = 307K
FLASH (rx) : ORIGIN = 0x08000000, LENGTH = 512K
Memory_B1(xrw) : ORIGIN = 0x2004C000, LENGTH = 0x80
Memory_B2(xrw) : ORIGIN = 0x2004C080, LENGTH = 0x80
Memory_B3(xrw) : ORIGIN = 0x2004C100, LENGTH = 0x17D0
Memory_B4(xrw) : ORIGIN = 0x2004D8D0, LENGTH = 0x17D0
}
.RxDescripSection (NOLOAD) : { *(.RxDescripSection) } >Memory_B1
.TxDescripSection (NOLOAD) : { *(.TxDescripSection) } >Memory_B2
.RxarraySection (NOLOAD) : { *(.RxBUF) } >Memory_B3
.TxarraySection (NOLOAD) : { *(.TxBUF) } >Memory_B4
ethernetif.c
/* GENERATED CODE */
#if defined ( __ICCARM__ ) /*!< IAR Compiler */
#pragma data_alignment=4
#endif
__ALIGN_BEGIN ETH_DMADescTypeDef DMARxDscrTab[ETH_RXBUFNB] __ALIGN_END;/* Ethernet Rx MA Descriptor */
#if defined ( __ICCARM__ ) /*!< IAR Compiler */
#pragma data_alignment=4
#endif
__ALIGN_BEGIN ETH_DMADescTypeDef DMATxDscrTab[ETH_TXBUFNB] __ALIGN_END;/* Ethernet Tx DMA Descriptor */
#if defined ( __ICCARM__ ) /*!< IAR Compiler */
#pragma data_alignment=4
#endif
__ALIGN_BEGIN uint8_t Rx_Buff[ETH_RXBUFNB][ETH_RX_BUF_SIZE] __ALIGN_END; /* Ethernet Receive Buffer */
#if defined ( __ICCARM__ ) /*!< IAR Compiler */
#pragma data_alignment=4
#endif
__ALIGN_BEGIN uint8_t Tx_Buff[ETH_TXBUFNB][ETH_TX_BUF_SIZE] __ALIGN_END; /* Ethernet Transmit Buffer */
****************************************************************
/* EXAMPLE CODE */
ETH_DMADescTypeDef DMARxDscrTab[ETH_RXBUFNB] __attribute__((section(".RxDescripSection")));/* Ethernet Rx DMA Descriptors */
ETH_DMADescTypeDef DMATxDscrTab[ETH_TXBUFNB] __attribute__((section(".TxDescripSection")));/* Ethernet Tx DMA Descriptors */
uint8_t Rx_Buff[ETH_RXBUFNB][ETH_RX_BUF_SIZE] __attribute__((section(".RxarraySection"))); /* Ethernet Receive Buffers */
uint8_t Tx_Buff[ETH_TXBUFNB][ETH_TX_BUF_SIZE] __attribute__((section(".TxarraySection"))); /* Ethernet Transmit Buffers */
The "application" code, is exactly the same as in the netconn tcp_echo_server example.
Is there anyone who managed to use the LwIP stack on this MCU STM32F746?
Tnx.
