https://community.nxp.com/t5/S32K/Issue-for-GMAC-internal-loopback-example-on-S32K344/m-p/2004623#M43772 <P>Apologies, I have resolved the issue.</P><P>I had not added DstAddr, SrcAddr, EtherType/Length, and FCS to the data, and I had not called the Gmac_Ip_ProvideRxBuff(INST_GMAC_0, 0U, &amp;rx_buffer) function.</P><P>After adding this code, the issue was resolved.</P> Mon, 02 Dec 2024 01:22:36 GMT malove 2024-12-02T01:22:36Z https://community.nxp.com/t5/S32K/Issue-for-GMAC-internal-loopback-example-on-S32K344/m-p/2004610#M43770 <P>Hello</P><P>&nbsp;</P><P>I have a question while porting GMAC Loopback mode code.</P><P>The structure of my project is as follows:</P><P>- PIT increments the counter variable every 1 ms.</P><P>- When the counter variable reaches 10, the GMAC_Test function is called.</P><P>&nbsp;</P><P>When the GMAC_Test function is called, the output information is as follows:</P><P>Tx buffer: 17 (0x11) 34 (0x22) 51 (0x33) 68 (0x44) 85 (0x55) 102 (0x66) 17 (0x11) 34 (0x22) 51 (0x33) 68 (0x44) 85 (0x55) 102 (0x66)</P><P>Rx buffer: 0 (0x00) 0 (0x00) 0 (0x00) 0 (0x00) 0 (0x00) 0 (0x00) 0 (0x00) 0 (0x00) 0 (0x00) 0 (0x00) 0 (0x00) 0 (0x00)</P><P>Tx buffer: 17 (0x11) 34 (0x22) 51 (0x33) 68 (0x44) 85 (0x55) 102 (0x66) 17 (0x11) 34 (0x22) 51 (0x33) 68 (0x44) 85 (0x55) 102 (0x66)</P><P>Rx buffer: 17 (0x11) 34 (0x22) 51 (0x33) 68 (0x44) 85 (0x55) 102 (0x66) 17 (0x11) 34 (0x22) 51 (0x33) 68 (0x44) 85 (0x55) 102 (0x66)</P><P>Tx buffer: 17 (0x11) 34 (0x22) 51 (0x33) 68 (0x44) 85 (0x55) 102 (0x66) 17 (0x11) 34 (0x22) 51 (0x33) 68 (0x44) 85 (0x55) 102 (0x66)</P><P>Rx buffer: 99 (0x63) 191 (0xbf) 193 (0xc1) 247 (0xf7) 0 (0x00) 0 (0x00) 0 (0x00) 0 (0x00) 0 (0x00) 0 (0x00) 0 (0x00) 0 (0x00)</P><P>Tx buffer: 17 (0x11) 34 (0x22) 51 (0x33) 68 (0x44) 85 (0x55) 102 (0x66) 17 (0x11) 34 (0x22) 51 (0x33) 68 (0x44) 85 (0x55) 102 (0x66)</P><P>Rx buffer: 17 (0x11) 34 (0x22) 51 (0x33) 68 (0x44) 85 (0x55) 102 (0x66) 17 (0x11) 34 (0x22) 51 (0x33) 68 (0x44) 85 (0x55) 102 (0x66)</P><P>Tx buffer: 17 (0x11) 34 (0x22) 51 (0x33) 68 (0x44) 85 (0x55) 102 (0x66) 17 (0x11) 34 (0x22) 51 (0x33) 68 (0x44) 85 (0x55) 102 (0x66)</P><P>Rx buffer: 99 (0x63) 191 (0xbf) 193 (0xc1) 247 (0xf7) 0 (0x00) 0 (0x00) 0 (0x00) 0 (0x00) 0 (0x00) 0 (0x00) 0 (0x00) 0 (0x00)</P><P>&nbsp;</P><P>After this, the GMAC status variable remains stuck in the GMAC_STATUS_RX_QUEUE_EMPTY state.</P><P>In other words, the message sent from TX does not appear to be properly reflected in the RX buffer, and after sending and receiving the message 5 times, the GMAC_STATUS_RX_QUEUE_EMPTY state cannot be exited.</P><P>How can I resolve this issue?</P> Mon, 02 Dec 2024 00:48:19 GMT https://community.nxp.com/t5/S32K/Issue-for-GMAC-internal-loopback-example-on-S32K344/m-p/2004610#M43770 malove 2024-12-02T00:48:19Z https://community.nxp.com/t5/S32K/Issue-for-GMAC-internal-loopback-example-on-S32K344/m-p/2004623#M43772 <P>Apologies, I have resolved the issue.</P><P>I had not added DstAddr, SrcAddr, EtherType/Length, and FCS to the data, and I had not called the Gmac_Ip_ProvideRxBuff(INST_GMAC_0, 0U, &amp;rx_buffer) function.</P><P>After adding this code, the issue was resolved.</P> Mon, 02 Dec 2024 01:22:36 GMT https://community.nxp.com/t5/S32K/Issue-for-GMAC-internal-loopback-example-on-S32K344/m-p/2004623#M43772 malove 2024-12-02T01:22:36Z