LwIP problems from code generated via STM32CubeMX (SMT32H7)
Hello,
I seem to be having some problems with the code generated via STM32CubeMX on the NUCLEO-H743ZI development board. I want to configure it to run on LwIP/RAW API. I can create such a configuration for its close relative: the NUCLEO F767ZI development board. In the latter case I take the following steps:
- Set the HCLK to 216 MHz (clocked from the HSI);
- Enable the ETH peripheral, set it to RMII mode, and set ETH_TXD0 and ETH_TX_EN pins to PG13 and PG11 (others are mapped appropriately);
- Set the PHY address to 0 in ETH Configuration>General: Ethernet Configuration
- Enable the LwIP middleware;
- Enable ICMP (LWIP_BROADCAST_PING and LWIP_MULTICAST_PING in LwIP Key Options>IPMP Options). This step is not necessary, although it helps to determine if all is well with the device.
After I generate the code, I add an extern variable to my main.c to be able to track whether the device has obtained an IP address:
/* USER CODE BEGIN PV */
/* Private variables ---------------------------------------------------------*/
extern struct netif gnetif;
/* USER CODE END PV */Moreover, I add the standard LwIP/RAW IP callbacks t the main loop:
/* Infinite loop */
/* USER CODE BEGIN WHILE */
while (1)
{
/* USER CODE END WHILE */
/* USER CODE BEGIN 3 */
ethernetif_input(&gnetif);
sys_check_timeouts();
}
/* USER CODE END 3 */This code works well and I am able to get an IP address (I can determine it frome the gnetif->ip_addr field), I can see all the proper ARP request in WireShark and I am able to ping the device:
Herein, I am filtering only the traffic from/to the appropriate (STM32) MAC address 00:80:E1:00:00:00.
For the NUCLEO-H7432ZI board, I essentially follow the same steps, with a couple of minor deviations:
- Set the HCLK to 400 MHz (clocked from the HSI);
- Enable the ETH peripheral, set it to RMII mode, and set ETH_TXD0 and ETH_TX_EN pins to PG13 and PG11 (others are mapped appropriately);
- Enable the CPU DCache (under Cortex_M7 Configuration)
- Enable the LWIP middleware
- Select LAN8742/LAN8742 as the Driver_PHY (under LwIP>Platform Settings)
- Enable ICMP (LWIP_BROADCAST_PING and LWIP_MULTICAST_PING in LwIP Key Options>IPMP Options).
I change the code in main.c appropriately as for the F7 example. Moreover, I edit the linker file to partition the RAM from 0x24000000 to 0x2407FFFF (there is an instruction in ETH>Parameter Setting to do so in order to get the ETH peripheral working).
If I upload this (nearly identical) build to the NUCLEAO-H743ZI board, I get no network activity (No ARP requests to get an IP address.
Now I know that the issue is somewhere in the STM32CubeMX generated configuration. The hardware itself is good. There is an example of a LwIP HTTP server in STM32Cube_FW_H7_V1.1.0 which works just fine if I upload it to the board. The LwIP_HTTP_Server_Netconn_RTOS example in STM32Cube_FW_H7_V1.1.0 is somewhat different: it uses a RTOS and the Netconn API. For my application I want to stick with Raw API (and no RTOS). So my question would be, what am I missing in my microcontroller configuration?