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| -rw-r--r-- | misc/demo.s | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/misc/demo.s b/misc/demo.s new file mode 100644 index 0000000..1191b24 --- /dev/null +++ b/misc/demo.s @@ -0,0 +1,20 @@ +.syntax unified +.cpu cortex-m0plus +.thumb + +.align 4 + +ECHO: LDR R1, [PC, #20] // 00 044405 0x00 0x4905 UART0_BASE + MOVS R3, 0x10 // 02 021420 0x02 0x2310 RX FIFO EMPTY +1: LDR R2, [R1, 0x18] // 04 064612 0x04 0x698A UARTFR_OFST + TST R2, R3 // 06 041032 0x06 0x421A + BNE 1b // 10 150774 0x08 0xD1FC + LDRB R0, [R1] // 12 074010 0x0A 0x7808 UARTDR_OFST + MOVS R3, 0x20 // 14 021440 0x0C 0x2320 TX FIFO FULL +1: LDR R2, [R1, 0x18] // 16 064612 0x0E 0x698A UARTFR_OFST + TST R2, R3 // 20 041032 0x10 0x421A + BNE 1b // 22 150774 0x12 0xD1FC + STRB R0, [R1] // 24 070010 0x14 0x7008 UARTDR_OFST + B ECHO // 26 163763 0x16 0xE7F3 + .WORD 0x40034000 // 30 040000 0x18 0x4000 + // 32 040003 0x1A 0x4003 |