bootromfun/dtprog: programmer fuers BootROM \o/

[calu.git] / 3_test / uartint.s

diff --git a/3_test/uartint.s b/3_test/uartint.s
index 8afa8f23fa081bddfce80f9d4fd8f02e5c474166..ed9df5776258c2cc11677adae29e800d20111f5b 100644 (file)
--- a/3_test/uartint.s
+++ b/3_test/uartint.s
@@ -1,22 +1,66 @@
+.data
+str:
+       .fill 0x41424344
+       .fill 0x0a0d0000
 .text
+       .define UART_BASE, 0x2000
+       .define UART_STATUS, 0x0
+       .define UART_RECV, 0xc
+       .define UART_TRANS, 0x8
+
+       .define UART_TRANS_EMPTY, 0x1
+       .define UART_RECV_NEW, 0x2
 start:
        br+ main ;br+ 
        br+ main
        ret
 main:
-       ldi r0, 0x2000 ; status...
-       ldi r1, 0x200b ;ldi r1, 8203
-       ldi r2, 0x200c ;ldi r2, 8204
-       ; ldi r4, 0x2024 ;ldi r4, 8228
-       ; ldi r5, 3 ; enable interrupts
-       ; stw r5, 0(r4)
-       ldw r5, 0(r0)
-       andx r5, 0x2
+       ldi r10, UART_BASE@lo
+       ldih r10, UART_BASE@hi
+       ldw r5, UART_STATUS(r10)
+       andx r5, UART_RECV_NEW
        brzs+ main ; no new data?
-       ldw r7, 0(r2) ; load data
+       ldw r7, UART_RECV(r10) ; load data
+
+       xor r1, r1, r1
+       xor r2, r2, r2
+       xor r3, r3, r3
+       ; ldi r1, str
+       ; ldi r1, 0x58
+       ; stb r1, str(r3)
+       ldw r1, str(r3) 
+       ldi r2, 6
+       ;call send_string
+       call send_byte
+
+main2:
+       ldw r5, UART_STATUS(r10)
+       andx r5, UART_RECV_NEW
+       brzs+ main2 ; no new data?
+       ldw r7, UART_RECV(r10) ; load data
 uartnrdy:
        ldw r5, 0(r0)
-       andx r5, 0x1
+       andx r5, UART_TRANS_EMPTY
        brnz+ uartnrdy ; transmitter not ready yet?
-       stw r7, 0(r1) ; send zeh shit!
-       br main ; back to usual stuff
+       stw r7, UART_TRANS(r10) ; send zeh shit!
+       br main2 ; back to usual stuff
+
+send_string:
+       ; r1 = addr
+       ; r2 = len
+       addi r3, r1, 0
+send_string_int:
+       cmpi r2, 0
+       reteq-
+       ldb r1, 0(r3)
+       call send_byte
+       addi r2, r2, 0-1
+       addi r3, r3, 1
+       br send_string_int
+
+send_byte:
+       ldw r9, UART_STATUS(r10)
+       andx r9, UART_TRANS_EMPTY
+       brnz+ send_byte ; branch if not zero
+       stw r1, UART_TRANS(r10)
+       ret