bootromfun: okay, speicherzugriffe haben definitiv bei mein fpga ned [...]

[calu.git] / 2_isa / src / bootrom.s

diff --git a/2_isa/src/bootrom.s b/2_isa/src/bootrom.s
index 9dcc5411d9c80cfc055f4e5a611b9738e65820fc..9ff1bf77d26158c56366cccb50566fb1be858a76 100644 (file)
--- a/2_isa/src/bootrom.s
+++ b/2_isa/src/bootrom.s
@@ -25,15 +25,10 @@ main:
        ldi r11, PBASE@lo
        ldih r11, PBASE@hi
 poll:
-       ldw r3, UART_STATUS(r10)
-       andx r3, UART_RECV_NEW
-       brzs+ poll; branch if zero
-       xor r0, r0, r0
-       ldw r0, UART_RECV(r10)
+       call recv_byte
        ; we received the enter bootrom sign
        xor r1, r1, r1
        cmpi r0, 0x48 ; 'H'
-       br tehend
        breq+ bt_H
        br poll ; else
 
@@ -163,3 +158,12 @@ bt_J:
        brr r0
 
 tehend:
+       xor r1, r1, r1
+       ldi r1, 0x41 ; 'A'
+       call send_byte
+       xor r1, r1, r1
+       ldi r1, 0x42 ; 'B'
+       call send_byte
+       xor r1, r1, r1
+       ldi r1, 0x43 ; 'C'
+       call send_byte