version 4.2.0

[fx2fw-sdcc] / startup.a51

diff --git a/startup.a51 b/startup.a51
index 84ec4df..eb12b81 100644 (file)
--- a/startup.a51
+++ b/startup.a51
@@ -1,156 +1,78 @@
 ;;; -*- asm -*-\r
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 ;;;\r
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 ;;;-----------------------------------------------------------------------------\r
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 ;;; Startup code\r
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 ;;;-----------------------------------------------------------------------------\r
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 ;;; Code taken from USRP2 firmware (GNU Radio Project), version 3.0.2,\r
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 ;;; Copyright 2003 Free Software Foundation, Inc.\r
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 ;;;-----------------------------------------------------------------------------\r
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 ;;; This code is part of usbjtag. usbjtag is free software; you can redistribute\r
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 ;;; it and/or modify it under the terms of the GNU General Public License as\r
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 ;;; published by the Free Software Foundation; either version 2 of the License,\r
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 ;;; or (at your option) any later version. usbjtag is distributed in the hope\r
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 ;;; that it will be useful, but WITHOUT ANY WARRANTY; without even the implied\r
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 ;;; warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\r
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 ;;; GNU General Public License for more details.  You should have received a\r
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 ;;; copy of the GNU General Public License along with this program in the file\r
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 ;;; COPYING; if not, write to the Free Software Foundation, Inc., 51 Franklin\r
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 ;;; St, Fifth Floor, Boston, MA  02110-1301  USA\r
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 ;;;-----------------------------------------------------------------------------\r
 \r
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 ;;; The default external memory initialization provided by sdcc is not\r
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 ;;; appropriate to the FX2.  This is derived from the sdcc code, but uses \r
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 ;;; the FX2 specific _MPAGE sfr.\r
 \r
 \r
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         ;; .area XISEG   (XDATA)  ; the initialized external data area\r
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         ;; .area XINIT   (CODE)          ; the code space consts to init XISEG\r
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         .area XSEG    (XDATA)          ; zero initialized xdata\r
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         .area USBDESCSEG (XDATA)  ; usb descriptors\r
 \r
 \r
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-        \r
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         .area CSEG    (CODE)\r
 \r
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         ;; sfr that sets upper address byte of MOVX using @r0 or @r1\r
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         _MPAGE        =        0x0092\r
 \r
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 __sdcc_external_startup::\r
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         ;; This system is now compiled with the --no-xinit-opt \r
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         ;; which means that any initialized XDATA is handled\r
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         ;; inline by code in the GSINIT segs emitted for each file.\r
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         ;; \r
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         ;; We zero XSEG and all of the internal ram to ensure \r
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         ;; a known good state for uninitialized variables.\r
 \r
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 ;        _mcs51_genRAMCLEAR() start\r
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         mov        r0,#l_XSEG\r
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         mov        a,r0\r
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         orl        a,#(l_XSEG >> 8)\r
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         jz        00002$\r
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         mov        r1,#((l_XSEG + 255) >> 8)\r
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         mov        dptr,#s_XSEG\r
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         clr     a\r
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         \r
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 00001$:        movx        @dptr,a\r
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         inc        dptr\r
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         djnz        r0,00001$\r
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         djnz        r1,00001$\r
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         \r
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         ;; We're about to clear internal memory.  This will overwrite\r
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         ;; the stack which contains our return address.\r
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         ;; Pop our return address into DPH, DPL\r
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 00002$:        pop        dph\r
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         pop        dpl\r
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         \r
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         ;; R0 and A contain 0.  This loop will execute 256 times.\r
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         ;; \r
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         ;; FWIW the first iteration writes direct address 0x00,\r
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         ;; which is the location of r0.  We get lucky, we're \r
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         ;; writing the correct value (0)\r
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         \r
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 00003$:        mov        @r0,a\r
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         djnz        r0,00003$\r
 \r
-\r
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         push        dpl                ; restore our return address\r
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         push        dph\r
 \r
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         mov        dpl,#0                ; indicate that data init is still required\r
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         ret\r
-\r