Remove delay_us

stm32/mk4-bootloader/ae.c

@@ -280,7 +280,7 @@ ae_wake(void)
     // send zero (all low), delay 2.5ms
     _send_byte(0x00);
 
-    delay_us(2500);     // measured: ~2.9ms
+    delay_ms(3);     // measured: ~2.9ms
 
     _flush_rx();
 }

stm32/mk4-bootloader/delay.c

@@ -25,21 +25,4 @@ delay_ms(int ms)
     }
 }
 
-// delay_us()
-//
-    void
-delay_us(int us)
-{
-    if(us > 1000) {
-        // big round up
-        delay_ms((us + 500) / 1000);
-
-    } else {
-        // XXX calibrate this
-        for(volatile int i=0; i<(10000*us); i++) {
-            __NOP();
-        }
-    }
-}
-
 // EOF

stm32/mk4-bootloader/delay.h

@@ -3,7 +3,7 @@
  */
 #pragma once
 
-// Software delay loops (we have no interrupts)
-
+// Uses SYSTICK in polling mode
 void delay_ms(int ms);
-void delay_us(int us);
+
+// EOF