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 bf8e43d46128840ef52b61b556a613c32cff487e..ed9df5776258c2cc11677adae29e800d20111f5b 100644 (file)
--- a/3_test/uartint.s
+++ b/3_test/uartint.s
@@ -1,65 +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+ 
-       call+ uartrdy ;call+ 0x80(128, 128)
+       br+ main
        ret
 main:
-       ldi r1, 0x200b ;ldi r1, 8203
-       ldi r2, 0x200c ;ldi r2, 8204
-       ldi r3, 0x2010 ;ldi r3, 8208
-       ldi r4, 0x2024 ;ldi r4, 8228
-       ldi r5, 3
-       stw r5, 0(r4)
-       br+ start
-       ; stwnv r5, 0(r4)
-uartrdy:
-       ; load instructions into ram
-       ldi r8, 0x2037 ; paddr
-       ldi r9, 0x203b ; pdata
-
-    ; x"e7390000"; -- ldw r7, 0(r2)
-       xor r10, r10, r10
-       stw r10, 0(r8)
-       xor r10, r10, r10
-       ldi r10, 0xe739
-       lls r10, r10, 16
-       stw r10, 0(r9)
+       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, UART_RECV(r10) ; load data
 
-       ;x"e7b98000"; -- stw r7, 0(r3)
-       xor r10, r10, r10
-       ldi r10, 1
-       stw r10, 0(r8)
-       xor r10, r10, r10
-       ldi r10, 0xe7b9
-       lls r10, r10, 8
-       addi r10, r10, 0x80
-       lls r10, r10, 8
-       stw r10, 0(r9)
+       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
 
-       ;x"e7b88000"; -- stw r7, 0(r1)
-       xor r10, r10, r10
-       ldi r10, 2
-       stw r10, 0(r8)
-       xor r10, r10, r10
-       ldi r10, 0xe7b8
-       lls r10, r10, 8
-       addi r10, r10, 0x80
-       lls r10, r10, 8
-       stw r10, 0(r9)
+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, UART_TRANS_EMPTY
+       brnz+ uartnrdy ; transmitter not ready yet?
+       stw r7, UART_TRANS(r10) ; send zeh shit!
+       br main2 ; back to usual stuff
 
-       ;x"eb000008"; -- ret-
-       xor r10, r10, r10
-       ldi r10, 3
-       stw r10, 0(r8)
-       xor r10, r10, r10
-       ldi r10, 0xeb00
-       lls r10, r10, 16
-       addi r10, r10, 0x8
-       stw r10, 0(r9)
-       br hmm
+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
 
-.org 0x1fc
-hmm:
-       ldinv r0, 0
-; real ram...
-woot:
+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