+.data
+str:
+ ; "zlol"
+ .fill 0x5a4c4f4c
+ .fill 0x00000a0d
+
+int2hex:
+ ;3210
+ .fill 0x33323130
+ ;7654
+ .fill 0x37363534
+ ;ba98
+ .fill 0x62613938
+ ;fedc
+ .fill 0x66656463
.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
+ 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)
+ xor r10, r10, r10
+ xor r7, r7, r7
+ 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
+
+ xor r1, r1, r1
+ xor r2, r2, r2
+ xor r3, r3, r3
+ ldi r1, str
+ ldi r2, 6
+ call send_string
+ xor r1, r1, r1
+ xor r2, r2, r2
+ ldi r1, 0x12bd
+ ldih r1, 0x1337
+ call debug_uint
+ ldi r1, 0x1337
+ ldih r1, 0x12bd
+ call debug_uint
+
+main2:
+ ldw r5, UART_STATUS(r10)
+ andx r5, UART_RECV_NEW
+ brzs+ main2 ; no new data?
+ ldb r7, UART_RECV(r10) ; load data
+uartnrdy:
ldw r5, 0(r0)
- andx r5, 0x2
- brzs+ main
-uartrdy:
- ldw r7, 0(r2)
- stw r7, 0(r1)
- br main
+ 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
+
+send_string:
+ ; r1 = addr
+ ; r2 = len
+ addi r3, r1, 0
+send_string_int:
+ cmpi r2, 0
+ reteq-
+ ldb r1, 0(r3)
+ call send_byte
+ addis 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
+ stb r1, UART_TRANS(r10)
+ ret
+
+debug_uint:
+ addi r8, r1, 0
+ ;usb_sendbuffersafe ("0x", 2);
+ xor r1, r1, r1
+ ldi r1, 0x30
+ call send_byte
+ xor r1, r1, r1
+ ldi r1, 0x78
+ call send_byte
+ ;j = 0
+ xor r7, r7, r7
+ xor r6, r6, r6
+ ldi r6, int2hex@lo
+ ldih r6, int2hex@hi
+debug_unit_loop:
+ ;for (j = 0; j < 8; ++j) {
+ cmpi r7, 8
+ reteq
+ ;usb_sendbuffersafe (&int2hex[(i >> 28) & 0xf], 1);
+ lrs r1, r8, 28
+ andx r1, 0xf
+ add r9, r6, r1
+ ldb r1, 0(r9)
+ call send_byte
+ ;i <<= 4;
+ lls r8, r8, 4
+ addi r7, r7, 1
+ br debug_unit_loop