XMC™ Forum Discussions

Hello!

I've been working on implementing PTP on the XMC4700, and I'm close to getting the timestamping setup working.  However, I'm quite puzzled by the description of the TIMESTAMP_CONTROL.SNAPTYPSEL bitfield (XMC4700 reference manual page 1212).  It simply says, "These bits along with Bits 15 and 14 decide the set of PTP packet types for which snapshot needs to be taken."  However, I can't find any other mention of this bitfield anywhere else in the datasheet, and there's no explanation anywhere of what the bits actually do.  Could someone provide some clarification on how this bitfield affects the packets that are timestamped?

Thanks!

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Hello everone,

We are implementing IEEE 1588 time sync on XMC4700 relax kit, we base on the DAVE example source code named "HTTP_SERVER_RTOS_XMC47". Our main function is as in the embedded code (print out timestamp of transmitted frame).

However, we always have same output, like "frame transmitted at 0 second, 4 nanosecond", this output only varies when I remove "malloc".

Inside the XMC_ETH_MAC_InitPTP function, I realized that the below assignment, the value of eth_mac->regs->TIMESTAMP_CONTROL always keeps 0, no mater what value I gave to the variable "config".

eth_mac->regs->TIMESTAMP_CONTROL = ETH_TIMESTAMP_CONTROL_TSENA_Msk | ETH_TIMESTAMP_CONTROL_TSCTRLSSR_Msk | config;

So my questions:

- Would any of you have solution?

- Is it possible/better to develop 1588 application without using library (like without using XMC_ETH_MAC_InitPTP from /HTTP_SERVER_RTOS_XMC47/Libraries/XMCLib/inc/xmc_eth_mac.h)? I mean we read/write register by ourself by refering the document "Reference Manual of XMC4700/XMC4800 Microcontroller" (the pdf with ~2893 pages)?

Thanks so much in advance for your help!

Thi

////////////////////////////we define///////////////////////////
#define MAC_ADDR0   0x8C
#define MAC_ADDR1   0x04
#define MAC_ADDR2   0xBA
#define MAC_ADDR3   0x17
#define MAC_ADDR4   0x8A
#define MAC_ADDR5   0x4A
#define MAC_ADDR    ((uint64_t)MAC_ADDR0 | \
                     ((uint64_t)MAC_ADDR1 << 😎 | \
                     ((uint64_t)MAC_ADDR2 << 16) | \
                     ((uint64_t)MAC_ADDR3 << 24) | \
                     ((uint64_t)MAC_ADDR4 << 32) | \
                     ((uint64_t)MAC_ADDR5 << 40))

#define XMC_ETH_MAC_NUM_RX_BUF (4)
#define XMC_ETH_MAC_NUM_TX_BUF (4)

static __attribute__((aligned(4))) XMC_ETH_MAC_DMA_DESC_t rx_desc[XMC_ETH_MAC_NUM_RX_BUF] __attribute__((section ("ETH_RAM")));
static __attribute__((aligned(4))) XMC_ETH_MAC_DMA_DESC_t tx_desc[XMC_ETH_MAC_NUM_TX_BUF] __attribute__((section ("ETH_RAM")));
static __attribute__((aligned(4))) uint8_t rx_buf[XMC_ETH_MAC_NUM_RX_BUF][XMC_ETH_MAC_BUF_SIZE] __attribute__((section ("ETH_RAM")));
static __attribute__((aligned(4))) uint8_t tx_buf[XMC_ETH_MAC_NUM_TX_BUF][XMC_ETH_MAC_BUF_SIZE] __attribute__((section ("ETH_RAM")));
////////////////////////////we define///////////////////////////

int main(void)
{
	DAVE_STATUS_t status;
	status = DAVE_Init();           
	if(status != DAVE_STATUS_SUCCESS)
	{
		XMC_DEBUG("DAVE APPs initialization failed\n");
		while(1U)
		{
		}
	}
	cgi_init();
	ssi_init();
	osThreadCreate (osThread(main_thread), NULL);



    ////////////////////////// our 1588 code ////////////////////////////
    XMC_ETH_MAC_TIME_t *txTime;
    char data[10];
    uint32_t config = (uint32_t)ETH_TIMESTAMP_CONTROL_TSENALL_Msk;

    memset(data, '\0', 10);
    snprintf(data, 10, "%s", "mydata");
    txTime = (XMC_ETH_MAC_TIME_t*)malloc(sizeof(XMC_ETH_MAC_TIME_t));
    XMC_ETH_MAC_t ethMac =
    {
      .regs = ETH0,
      .address = MAC_ADDR,
      .rx_desc = rx_desc,
      .tx_desc = tx_desc,
      .rx_buf = &rx_buf[0][0],
      .tx_buf = &tx_buf[0][0],
      .num_rx_buf = XMC_ETH_MAC_NUM_RX_BUF,
      .num_tx_buf = XMC_ETH_MAC_NUM_TX_BUF
    };

    XMC_ETH_MAC_InitPTP(&ethMac, config);
    lwip_send(0, data, sizeof(data), 1);
    XMC_ETH_MAC_GetTxTimeStamp(&ethMac, txTime);
    printf("transmitted at %"PRIu32" second, %"PRIu32" nanosecond \n", txTime->seconds, txTime->nanoseconds);
    ////////////////////////// our 1588 code ////////////////////////////



    osKernelStart();
}

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