Hi.
I am facing an issue using the W5500 chip attached to an STM32F429I-DISC1 board.
I am writing 1 + 2 MQTT packets to a MQTT broker running on my machine through the W5500 ethernet component. I am using the EthernetLib to.
Everything works correctly for a while, but after a certain point of the MQTT messages sent to the broker become corrupted and the broker closes the connection. The main code sends one connect packet and then 2 packets (publish) inside a loop. I hardcoded the packets in the code to help diagnose the problem.
As you can see there’s a Connect Command [Malformed Packet] that marks the beginning where the MQTT packets become corrupted, although the Connect Command was already sent (not shown in the image).
It seems that for some reason the TX Buffer data starts to overlap (for some unknown reason).
Questions:
Can this be related with Clock issues? The STM32 clock tree is configured as follows:
and the SPI Configuration is:
static void MX_SPI1_Init(void)
{
/* USER CODE BEGIN SPI1_Init 0 */
/* USER CODE END SPI1_Init 0 */
/* USER CODE BEGIN SPI1_Init 1 */
/* USER CODE END SPI1_Init 1 */
/* SPI1 parameter configuration*/
hspi1.Instance = SPI1;
hspi1.Init.Mode = SPI_MODE_MASTER;
hspi1.Init.Direction = SPI_DIRECTION_2LINES;
hspi1.Init.DataSize = SPI_DATASIZE_8BIT;
hspi1.Init.CLKPolarity = SPI_POLARITY_LOW;
hspi1.Init.CLKPhase = SPI_PHASE_1EDGE;
hspi1.Init.NSS = SPI_NSS_SOFT;
hspi1.Init.BaudRatePrescaler = SPI_BAUDRATEPRESCALER_32;
hspi1.Init.FirstBit = SPI_FIRSTBIT_MSB;
hspi1.Init.TIMode = SPI_TIMODE_DISABLE;
hspi1.Init.CRCCalculation = SPI_CRCCALCULATION_DISABLE;
hspi1.Init.CRCPolynomial = 10;
if (HAL_SPI_Init(&hspi1) != HAL_OK)
{
Error_Handler();
}
/* USER CODE BEGIN SPI1_Init 2 */
/* USER CODE END SPI1_Init 2 */
}
The main code is:
// RESET W5500
HAL_GPIO_WritePin(GPIOC, GPIO_PIN_8, GPIO_PIN_RESET);
HAL_Delay(600);
HAL_GPIO_WritePin(GPIOC, GPIO_PIN_8, GPIO_PIN_SET);
HAL_Delay(20);
// Setup Buffers
uint8_t rx_tx_buff_sizes[] = {2, 2, 2, 2, 2, 2, 2, 2};
wizchip_init(rx_tx_buff_sizes, rx_tx_buff_sizes);
// Define callbacks
reg_wizchip_cs_cbfunc(&SPIChipSelect, &SPIChipUnselect);
reg_wizchip_spi_cbfunc(&SPIReadByte, &SPIWriteByte);
// Open TCP Socket
socket(0, Sn_MR_TCP, 32000, 0);
uint8_t addr[] = { 192, 168, 1, 1 };
connect(0, addr, 1883);
const uint8_t connectCommand[] = "\x10\x25\x00\x04\x4d\x51\x54\x54\x05\x02\x01\xf4\x00\x00\x18\x56" \
"\x61\x63\x75\x75\x6d\x5f\x30\x30\x3a\x30\x38\x3a\x44\x43\x3a\x37" \
"\x35\x3a\x43\x30\x3a\x37\x44";
const uint8_t connectedStatus[] = "\x30\x8c\x01\x00\x37\x41\x63\x6d\x65\x2f\x48\x61\x72\x64\x77\x61" \
"\x72\x65\x2f\x30\x30\x3a\x30\x38\x3a\x44\x43\x3a\x37\x35\x3a\x43" \
"\x30\x3a\x37\x44\x2f\x53\x74\x61\x74\x75\x73\x2f\x43\x6f\x6e\x6e" \
"\x65\x63\x74\x69\x6f\x6e\x53\x74\x61\x74\x75\x73\x00\x7b\x0a\x22" \
"\x6d\x65\x73\x73\x61\x67\x65\x54\x79\x70\x65\x22\x3a\x20\x22\x52" \
"\x65\x70\x6f\x72\x74\x56\x61\x6c\x75\x65\x22\x2c\x0a\x22\x6e\x61" \
"\x6d\x65\x22\x3a\x20\x22\x43\x6f\x6e\x6e\x65\x63\x74\x69\x6f\x6e" \
"\x53\x74\x61\x74\x75\x73\x22\x2c\x0a\x22\x76\x61\x6c\x75\x65\x22" \
"\x3a\x20\x22\x43\x6f\x6e\x6e\x65\x63\x74\x65\x64\x22\x0a\x7d";
const uint8_t chamberPressureData[] ="\x30\x89\x01\x00\x36\x41\x63\x6d\x65\x2f\x48\x61\x72\x64\x77\x61" \
"\x72\x65\x2f\x30\x30\x3a\x30\x38\x3a\x44\x43\x3a\x37\x35\x3a\x43" \
"\x30\x3a\x37\x44\x2f\x53\x74\x61\x74\x75\x73\x2f\x43\x68\x61\x6d" \
"\x62\x65\x72\x50\x72\x65\x73\x73\x75\x72\x65\x00\x7b\x0a\x22\x6d" \
"\x65\x73\x73\x61\x67\x65\x54\x79\x70\x65\x22\x3a\x20\x22\x52\x65" \
"\x70\x6f\x72\x74\x56\x61\x6c\x75\x65\x22\x2c\x0a\x22\x6e\x61\x6d" \
"\x65\x22\x3a\x20\x22\x43\x68\x61\x6d\x62\x65\x72\x50\x72\x65\x73" \
"\x73\x75\x72\x65\x22\x2c\x0a\x22\x76\x61\x6c\x75\x65\x22\x3a\x20" \
"\x33\x32\x2e\x32\x30\x30\x31\x30\x30\x30\x0a\x7d";
// SEND MQTT Connect Command
WriteAll(connectCommand, sizeof(connectCommand) - 1);
HAL_Delay(250);
while(1)
{
// MQTT Publish Message #1
WriteAll(connectedStatus, sizeof(connectedStatus) - 1);
// MQTT Publish Message #2
WriteAll(chamberPressureData, sizeof(chamberPressureData) - 1);
}
´
I also wrote this auxiliary functions:
void WriteAll(const uint8_t* data, const size_t dataSize)
{
uint8_t* ptr = (uint8_t*)data;
size_t remaining = dataSize;
while (remaining > 0) {
auto result = send(0, ptr, remaining);
if (result > 0) {
remaining -= result;
ptr += result;
} else {
//UART_Printf("Send result: %d\n", result);
while(true)
{
}
}
}
}
void SPIChipSelect()
{
HAL_GPIO_WritePin(GPIOC, GPIO_PIN_7, GPIO_PIN_RESET);
}
void SPIChipUnselect()
{
HAL_GPIO_WritePin(GPIOC, GPIO_PIN_7, GPIO_PIN_SET);
}
uint8_t SPIReadByte()
{
uint8_t byte;
HAL_SPI_Receive(&hspi1, &byte, 1, 10000);
return byte;
}
void SPIWriteByte(uint8_t byte)
{
HAL_SPI_Transmit(&hspi1, &byte, 1, 10000);
}
The wiring is the following:
PC8 -> W5500 RESET PIN
PC7 -> W5500 CS PIN
PA5 -> W5500 CS CLOCK
PA6 -> W5500 MISO
PA7 -> W5500 MOSI
PA5/PA6/PA7 are associated with the SPI1 module.
