sam0_eth: wait until the current tx buffer is no longer in use

RIOT-OS · Apr 2, 2024 · c067fd2 · c067fd2
1 parent 3c07ebc
commit c067fd2
Showing 1 changed file with 6 additions and 0 deletions.
diff --git a/cpu/sam0_common/periph/eth.c b/cpu/sam0_common/periph/eth.c
@@ -185,6 +185,7 @@ static void _init_desc_buf(void)
     /* Initialize TX buffer descriptors */
     for (i=0; i < ETH_TX_BUFFER_COUNT; i++) {
         tx_desc[i].address = (uint32_t) tx_buf[i];
+        tx_desc[i].status = DESC_TX_STATUS_USED;
     }
     /* Set WRAP flag to indicate last buffer */
     tx_desc[i-1].status |= DESC_TX_STATUS_WRAP;
@@ -225,6 +226,11 @@ int sam0_eth_send(const struct iolist *iolist)
         return -ENOTSUP;
     }
 
+    /* wait until the current buffer is no longer in use */
+    while (!(tx_curr->status & DESC_TX_STATUS_USED)) {
+        thread_yield();
+    }
+
     /* load packet data into TX buffer */
     for (const iolist_t *iol = iolist; iol; iol = iol->iol_next) {
         if (tx_len + iol->iol_len > ETHERNET_MAX_LEN) {