Don't WFI in pktgen example

Author: Johannes Draaijer

examples/pktgen.rs

@@ -11,7 +11,6 @@ use core::cell::RefCell;
 use core::default::Default;
 use cortex_m_rt::{entry, exception};
 
-use cortex_m::asm;
 use cortex_m::interrupt::Mutex;
 use stm32_eth::{
     mac::{phy::BarePhy, Phy},
@@ -42,8 +41,8 @@ fn main() -> ! {
     defmt::info!("Enabling ethernet...");
     let (eth_pins, mdio, mdc) = common::setup_pins(gpio);
 
-    let mut rx_ring: [RingEntry<_>; 16] = Default::default();
-    let mut tx_ring: [RingEntry<_>; 8] = Default::default();
+    let mut rx_ring: [RingEntry<_>; 2] = Default::default();
+    let mut tx_ring: [RingEntry<_>; 2] = Default::default();
     let (mut eth_dma, eth_mac) = stm32_eth::new(
         ethernet.mac,
         ethernet.mmc,
@@ -143,13 +142,6 @@ fn main() -> ! {
                 }
             }
         }
-
-        cortex_m::interrupt::free(|cs| {
-            let eth_pending = ETH_PENDING.borrow(cs).borrow_mut();
-            if !*eth_pending {
-                asm::wfi();
-            }
-        });
     }
 }