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LP236X的教程里面有许多源码例程。我当初可是花钱买来的。希望能帮得上忙。

<P><STRONG><a name="[d7cbc8]"></a>_sys_close</STRONG> (Thumb, 20 bytes, Stack size 8 bytes, retarget.o(.text))
<BR><BR>[Stack]<UL><LI>Max Depth = 192 + Unknown Stack Size
<LI>Call Chain = _sys_close &rArr; __fclose &rArr; fat_close_write &rArr; write_last_entry &rArr; set_next_clus &rArr; cache_fat &rArr; mmc_write_sect &rArr; mci_read_status &rArr; mci_command
</UL>
<BR>[Calls]<UL><LI><a href="#[d75b40]">&gt;&gt;</a>&nbsp;&nbsp;&nbsp;__fclose
</UL>
<BR>[Called By]<UL><LI><a href="#[121b5a8]">&gt;&gt;</a>&nbsp;&nbsp;&nbsp;_fclose_internal
</UL>

<P><STRONG><a name="[d7cb80]"></a>_sys_write</STRONG> (Thumb, 58 bytes, Stack size 16 bytes, retarget.o(.text))
<BR><BR>[Stack]<UL><LI>Max Depth = 192<LI>Call Chain = _sys_write &rArr; __write &rArr; fat_write &rArr; get_free_clus &rArr; cache_fat &rArr; mmc_write_sect &rArr; mci_read_status &rArr; mci_command
</UL>
<BR>[Calls]<UL><LI><a href="#[d74700]">&gt;&gt;</a>&nbsp;&nbsp;&nbsp;__write
<LI><a href="#[d7dd80]">&gt;&gt;</a>&nbsp;&nbsp;&nbsp;sendchar
</UL>
<BR>[Called By]<UL><LI><a href="#[121b368]">&gt;&gt;</a>&nbsp;&nbsp;&nbsp;_writebuf
</UL>

<P><STRONG><a name="[d7cb38]"></a>_sys_read</STRONG> (Thumb, 56 bytes, Stack size 16 bytes, retarget.o(.text))
<BR><BR>[Stack]<UL><LI>Max Depth = 184 + Unknown Stack Size
<LI>Call Chain = _sys_read &rArr; __read &rArr; fat_read &rArr; set_next_clus &rArr; cache_fat &rArr; mmc_write_sect &rArr; mci_read_status &rArr; mci_command
</UL>
<BR>[Calls]<UL><LI><a href="#[d750e0]">&gt;&gt;</a>&nbsp;&nbsp;&nbsp;__read
<LI><a href="#[d81e50]">&gt;&gt;</a>&nbsp;&nbsp;&nbsp;getkey
</UL>
<BR>[Called By]<UL><LI><a href="#[12132d0]">&gt;&gt;</a>&nbsp;&nbsp;&nbsp;_readbuf
</UL>

<P><STRONG><a name="[d7caf0]"></a>_sys_istty</STRONG> (Thumb, 16 bytes, Stack size 0 bytes, retarget.o(.text))
<BR><BR>[Called By]<UL><LI><a href="#[120fd40]">&gt;&gt;</a>&nbsp;&nbsp;&nbsp;__flsbuf
<LI><a href="#[1212e48]">&gt;&gt;</a>&nbsp;&nbsp;&nbsp;_fseek
</UL>

<P><STRONG><a name="[d7caa8]"></a>_sys_seek</STRONG> (Thumb, 22 bytes, Stack size 8 bytes, retarget.o(.text))
<BR><BR>[Stack]<UL><LI>Max Depth = 160 + Unknown Stack Size
<LI>Call Chain = _sys_seek &rArr; __setfpos &rArr; fat_set_fpos &rArr; set_next_clus &rArr; cache_fat &rArr; mmc_write_sect &rArr; mci_read_status &rArr; mci_command
</UL>
<BR>[Calls]<UL><LI><a href="#[1207560]">&gt;&gt;</a>&nbsp;&nbsp;&nbsp;__setfpos
</UL>
<BR>[Called By]<UL><LI><a href="#[1213288]">&gt;&gt;</a>&nbsp;&nbsp;&nbsp;__filbuf
<LI><a href="#[121b368]">&gt;&gt;</a>&nbsp;&nbsp;&nbsp;_writebuf
</UL>

<P><STRONG><a name="[d7ca60]"></a>_sys_ensure</STRONG> (Thumb, 22 bytes, Stack size 8 bytes, retarget.o(.text))
<BR><BR>[Stack]<UL><LI>Max Depth = 40<LI>Call Chain = _sys_ensure &rArr; __flushbuf &rArr; fs_WriteBlock &rArr; fs_WriteData
</UL>
<BR>[Calls]<UL><LI><a href="#[1207ed8]">&gt;&gt;</a>&nbsp;&nbsp;&nbsp;__flushbuf
</UL>
<BR>[Called By]<UL><LI><a href="#[1213288]">&gt;&gt;</a>&nbsp;&nbsp;&nbsp;__filbuf
</UL>

<P><STRONG><a name="[d7ca18]"></a>_sys_flen</STRONG> (Thumb, 30 bytes, Stack size 8 bytes, retarget.o(.text))
<BR><BR>[Stack]<UL><LI>Max Depth = 64<LI>Call Chain = _sys_flen &rArr; __getfsize &rArr; fs_rd_sig
</UL>
<BR>[Calls]<UL><LI><a href="#[1206a58]">&gt;&gt;</a>&nbsp;&nbsp;&nbsp;__getfsize
</UL>
<BR>[Called By]<UL><LI><a href="#[1212e48]">&gt;&gt;</a>&nbsp;&nbsp;&nbsp;_fseek
</UL>

<P><STRONG><a name="[d7c9d0]"></a>_sys_tmpnam</STRONG> (Thumb, 4 bytes, Stack size 0 bytes, retarget.o(.text), UNUSED)

<P><STRONG><a name="[d7c988]"></a>_sys_command_string</STRONG> (Thumb, 2 bytes, Stack size 0 bytes, retarget.o(.text), UNUSED)

<P><STRONG><a name="[d7c940]"></a>_sys_exit</STRONG> (Thumb, 2 bytes, Stack size 0 bytes, retarget.o(.text))
<BR><BR>[Calls]<UL><LI><a href="#[d7c940]">&gt;&gt;</a>&nbsp;&nbsp;&nbsp;_sys_exit
</UL>
<BR>[Called By]<UL><LI><a href="#[d7c940]">&gt;&gt;</a>&nbsp;&nbsp;&nbsp;_sys_exit
<LI><a href="#[120edc8]">&gt;&gt;</a>&nbsp;&nbsp;&nbsp;__sig_exit
<LI><a href="#[1217f90]">&gt;&gt;</a>&nbsp;&nbsp;&nbsp;__rt_abort (via Veneer)
</UL>

<P><STRONG><a name="[121e358]"></a>__semihosting_guard</STRONG> (ARM, 0 bytes, Stack size 0 bytes, use_no_semi.o(.text), UNUSED)

<P><STRONG><a name="[121e310]"></a>__use_no_semihosting_swi</STRONG> (ARM, 4 bytes, Stack size 0 bytes, use_no_semi.o(.text), UNUSED)

<P><STRONG><a name="[121e120]"></a>toupper</STRONG> (Thumb, 34 bytes, Stack size 8 bytes, toupper.o(.text))
<BR><BR>[Stack]<UL><LI>Max Depth = 16<LI>Call Chain = toupper &rArr; __rt_ctype_table
</UL>
<BR>[Calls]<UL><LI><a href="#[1217618]">&gt;&gt;</a>&nbsp;&nbsp;&nbsp;__rt_ctype_table (via Veneer)
</UL>
<BR>[Called By]<UL><LI><a href="#[d82708]">&gt;&gt;</a>&nbsp;&nbsp;&nbsp;main
</UL>

<P><STRONG><a name="[121ded8]"></a>__printf</STRONG> (Thumb, 748 bytes, Stack size 48 bytes, __printf.o(.text), UNUSED)
<BR><BR>[Calls]<UL><LI><a href="#[1218490]">&gt;&gt;</a>&nbsp;&nbsp;&nbsp;__ARM_call_via_r3
<LI><a href="#[1218520]">&gt;&gt;</a>&nbsp;&nbsp;&nbsp;__ARM_call_via_r2
<LI><a href="#[12185b0]">&gt;&gt;</a>&nbsp;&nbsp;&nbsp;__ARM_call_via_r1
<LI><a href="#[121d038]">&gt;&gt;</a>&nbsp;&nbsp;&nbsp;_printf_charcount
<LI><a href="#[121d2c0]">&gt;&gt;</a>&nbsp;&nbsp;&nbsp;_printf_int_dec
<LI><a href="#[121d4d0]">&gt;&gt;</a>&nbsp;&nbsp;&nbsp;_printf_longlong_hex
<LI><a href="#[121d7c8]">&gt;&gt;</a>&nbsp;&nbsp;&nbsp;_printf_str
<LI><a href="#[121db78]">&gt;&gt;</a>&nbsp;&nbsp;&nbsp;_printf_wctomb (Weak Reference)
<LI><a href="#[121dbc0]">&gt;&gt;</a>&nbsp;&nbsp;&nbsp;_printf_wc (Weak Reference)
<LI><a href="#[121dc08]">&gt;&gt;</a>&nbsp;&nbsp;&nbsp;_printf_mbtowc (Weak Reference)
<LI><a href="#[121dc50]">&gt;&gt;</a>&nbsp;&nbsp;&nbsp;_printf_longlong_oct (Weak Reference)
<LI><a href="#[121dc98]">&gt;&gt;</a>&nbsp;&nbsp;&nbsp;_printf_longlong_dec (Weak Reference)
<LI><a href="#[121dce0]">&gt;&gt;</a>&nbsp;&nbsp;&nbsp;_printf_fp_hex (Weak Reference)
<LI><a href="#[121dd28]">&gt;&gt;</a>&nbsp;&nbsp;&nbsp;_printf_fp_dec (Weak Reference)
</UL>
<BR>[Called By]<UL><LI><a href="#[1213cc8]">&gt;&gt;</a>&nbsp;&nbsp;&nbsp;_printf_char_common
</UL>

<P><STRONG><a name="[121de90]"></a>_printf_return_value</STRONG> (Thumb, 2 bytes, Stack size 0 bytes, __printf.o(.text), UNUSED)

<P><STRONG><a name="[121de48]"></a>_printf_percent</STRONG> (Thumb, 2 bytes, Stack size 0 bytes, __printf.o(.text), UNUSED)

<P><STRONG><a name="[121de00]"></a>_printf_sizespec</STRONG> (Thumb, 2 bytes, Stack size 0 bytes, __printf.o(.text), UNUSED)

<P><STRONG><a name="[121d9f8]"></a>_printf_pre_padding</STRONG> (Thumb, 48 bytes, Stack size 16 bytes, _printf_pad.o(.text), UNUSED)
<BR><BR>[Calls]<UL><LI><a href="#[1218520]">&gt;&gt;</a>&nbsp;&nbsp;&nbsp;__ARM_call_via_r2
</UL>
<BR>[Called By]<UL><LI><a href="#[1213e90]">&gt;&gt;</a>&nbsp;&nbsp;&nbsp;_printf_int_common
<LI><a href="#[121d7c8]">&gt;&gt;</a>&nbsp;&nbsp;&nbsp;_printf_str
</UL>

<P><STRONG><a name="[121d9b0]"></a>_printf_post_padding</STRONG> (Thumb, 36 bytes, Stack size 16 bytes, _printf_pad.o(.text), UNUSED)
<BR><BR>[Calls]<UL><LI><a href="#[1218520]">&gt;&gt;</a>&nbsp;&nbsp;&nbsp;__ARM_call_via_r2
</UL>
<BR>[Called By]<UL><LI><a href="#[1213e90]">&gt;&gt;</a>&nbsp;&nbsp;&nbsp;_printf_int_common
<LI><a href="#[121d7c8]">&gt;&gt;</a>&nbsp;&nbsp;&nbsp;_printf_str
</UL>

<P><STRONG><a name="[121d7c8]"></a>_printf_str</STRONG> (Thumb, 94 bytes, Stack size 16 bytes, _printf_str.o(.text), UNUSED)
<BR><BR>[Calls]<UL><LI><a href="#[1218490]">&gt;&gt;</a>&nbsp;&nbsp;&nbsp;__ARM_call_via_r3
<LI><a href="#[121d9b0]">&gt;&gt;</a>&nbsp;&nbsp;&nbsp;_printf_post_padding
<LI><a href="#[121d9f8]">&gt;&gt;</a>&nbsp;&nbsp;&nbsp;_printf_pre_padding
</UL>
<BR>[Called By]<UL><LI><a href="#[121ded8]">&gt;&gt;</a>&nbsp;&nbsp;&nbsp;__printf
</UL>

<P><STRONG><a name="[121d4d0]"></a>_printf_longlong_hex</STRONG> (Thumb, 182 bytes, Stack size 88 bytes, _printf_longlong_hex.o(.text), UNUSED)
<BR><BR>[Calls]<UL><LI><a href="#[1213e90]">&gt;&gt;</a>&nbsp;&nbsp;&nbsp;_printf_int_common
<LI><a href="#[121d440]">&gt;&gt;</a>&nbsp;&nbsp;&nbsp;_printf_truncate_unsigned (Weak Reference)
</UL>
<BR>[Called By]<UL><LI><a href="#[121ded8]">&gt;&gt;</a>&nbsp;&nbsp;&nbsp;__printf
</UL>

<P><STRONG><a name="[121d2c0]"></a>_printf_int_dec</STRONG> (Thumb, 98 bytes, Stack size 72 bytes, _printf_dec.o(.text), UNUSED)
<BR><BR>[Calls]<UL><LI><a href="#[12124a8]">&gt;&gt;</a>&nbsp;&nbsp;&nbsp;__rt_udiv10 (via Veneer)
<LI><a href="#[1213e90]">&gt;&gt;</a>&nbsp;&nbsp;&nbsp;_printf_int_common
<LI><a href="#[121d230]">&gt;&gt;</a>&nbsp;&nbsp;&nbsp;_printf_truncate_signed (Weak Reference)
<LI><a href="#[121d440]">&gt;&gt;</a>&nbsp;&nbsp;&nbsp;_printf_truncate_unsigned (Weak Reference)
</UL>
<BR>[Called By]<UL><LI><a href="#[121ded8]">&gt;&gt;</a>&nbsp;&nbsp;&nbsp;__printf
</UL>

<P><STRONG><a name="[121d038]"></a>_printf_charcount</STRONG> (Thumb, 36 bytes, Stack size 0 bytes, _printf_charcount.o(.text), UNUSED)
<BR><BR>[Called By]<UL><LI><a href="#[121ded8]">&gt;&gt;</a>&nbsp;&nbsp;&nbsp;__printf
</UL>

<P><STRONG><a name="[121cf18]"></a>__0printf</STRONG> (Thumb, 46 bytes, Stack size 24 bytes, __0printf.o(.text), UNUSED)
<BR><BR>[Calls]<UL><LI><a href="#[1213448]">&gt;&gt;</a>&nbsp;&nbsp;&nbsp;ferror
<LI><a href="#[1213cc8]">&gt;&gt;</a>&nbsp;&nbsp;&nbsp;_printf_char_common
</UL>

<P><STRONG><a name="[121ced0]"></a>__1printf</STRONG> (Thumb, 0 bytes, Stack size 24 bytes, __0printf.o(.text))
<BR><BR>[Stack]<UL><LI>Max Depth = 24<LI>Call Chain = __1printf
</UL>
<BR>[Called By]<UL><LI><a href="#[d82708]">&gt;&gt;</a>&nbsp;&nbsp;&nbsp;main
<LI><a href="#[d82bd0]">&gt;&gt;</a>&nbsp;&nbsp;&nbsp;init_card
<LI><a href="#[d82c18]">&gt;&gt;</a>&nbsp;&nbsp;&nbsp;cmd_help
<LI><a href="#[d82c60]">&gt;&gt;</a>&nbsp;&nbsp;&nbsp;cmd_format
<LI><a href="#[d82ca8]">&gt;&gt;</a>&nbsp;&nbsp;&nbsp;cmd_dir
<LI><a href="#[d82cf0]">&gt;&gt;</a>&nbsp;&nbsp;&nbsp;cmd_delete
<LI><a href="#[d82d38]">&gt;&gt;</a>&nbsp;&nbsp;&nbsp;cmd_copy
<LI><a href="#[d82d80]">&gt;&gt;</a>&nbsp;&nbsp;&nbsp;cmd_rename
<LI><a href="#[d82dc8]">&gt;&gt;</a>&nbsp;&nbsp;&nbsp;cmd_type
<LI><a href="#[d82e10]">&gt;&gt;</a>&nbsp;&nbsp;&nbsp;cmd_fill
<LI><a href="#[d82e58]">&gt;&gt;</a>&nbsp;&nbsp;&nbsp;cmd_capture
</UL>

<P><STRONG><a name="[121cc80]"></a>__0fprintf</STRONG> (Thumb, 48 bytes, Stack size 32 bytes, __0fprintf.o(.text), UNUSED)
<BR><BR>[Calls]<UL><LI><a href="#[1213448]">&gt;&gt;</a>&nbsp;&nbsp;&nbsp;ferror
<LI><a href="#[1213cc8]">&gt;&gt;</a>&nbsp;&nbsp;&nbsp;_printf_char_common
</UL>

<P><STRONG><a name="[121cc38]"></a>__1fprintf</STRONG> (Thumb, 0 bytes, Stack size 32 bytes, __0fprintf.o(.text))
<BR><BR>[Stack]<UL><LI>Max Depth = 32<LI>Call Chain = __1fprintf
</UL>
<BR>[Called By]<UL><LI><a href="#[d82e10]">&gt;&gt;</a>&nbsp;&nbsp;&nbsp;cmd_fill
</UL>

<P><STRONG><a name="[121cab8]"></a>__0sprintf</STRONG> (Thumb, 40 bytes, Stack size 32 bytes, __0sprintf.o(.text), UNUSED)
<BR><BR>[Calls]<UL><LI><a href="#[1213a80]">&gt;&gt;</a>&nbsp;&nbsp;&nbsp;_sputc
<LI><a href="#[1213cc8]">&gt;&gt;</a>&nbsp;&nbsp;&nbsp;_printf_char_common
</UL>

<P><STRONG><a name="[121ca70]"></a>__1sprintf</STRONG> (Thumb, 0 bytes, Stack size 32 bytes, __0sprintf.o(.text))
<BR><BR>[Stack]<UL><LI>Max Depth = 32<LI>Call Chain = __1sprintf
</UL>
<BR>[Called By]<UL><LI><a href="#[d82ea0]">&gt;&gt;</a>&nbsp;&nbsp;&nbsp;dot_format
</UL>

<P><STRONG><a name="[121c8b0]"></a>__0sscanf</STRONG> (Thumb, 54 bytes, Stack size 72 bytes, __0sscanf.o(.text))
<BR><BR>[Stack]<UL><LI>Max Depth = 244 + Unknown Stack Size
<LI>Call Chain = __0sscanf &rArr; __vfscanf_char &rArr; __vfscanf &rArr; _scanf_longlong &rArr; __aeabi_lmul
</UL>
<BR>[Calls]<UL><LI><a href="#[12135f8]">&gt;&gt;</a>&nbsp;&nbsp;&nbsp;__vfscanf_char
</UL>
<BR>[Called By]<UL><LI><a href="#[d82e10]">&gt;&gt;</a>&nbsp;&nbsp;&nbsp;cmd_fill
</UL>

<P><STRONG><a name="[121c660]"></a>_scanf_int</STRONG> (Thumb, 342 bytes, Stack size 48 bytes, _scanf_int.o(.text))
<BR><BR>[Stack]<UL><LI>Max Depth = 48 + Unknown Stack Size
<LI>Call Chain = _scanf_int
</UL>
<BR>[Calls]<UL><LI><a href="#[1213960]">&gt;&gt;</a>&nbsp;&nbsp;&nbsp;_chval
<LI><a href="#[12185b0]">&gt;&gt;</a>&nbsp;&nbsp;&nbsp;__ARM_call_via_r1
</UL>
<BR>[Called By]<UL><LI><a href="#[1210028]">&gt;&gt;</a>&nbsp;&nbsp;&nbsp;__vfscanf
</UL>

<P><STRONG><a name="[121c438]"></a>_scanf_longlong</STRONG> (Thumb, 342 bytes, Stack size 56 bytes, _scanf_longlong.o(.text))
<BR><BR>[Stack]<UL><LI>Max Depth = 60 + Unknown Stack Size
<LI>Call Chain = _scanf_longlong &rArr; __aeabi_lmul