📄 com_baud.lst
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##############################################################################
# #
# IAR ARM ANSI C/EC++ Compiler V3.10A/W32 05/Nov/2001 14:53:15 #
# Copyright 1999-2001 IAR Systems. All rights reserved. #
# #
# Cpu mode = arm #
# Code model = small #
# Endian = little #
# Source file = C:\At91\software\projects\bench\Source\com_baud.c #
# Command line = -I C:\Compil\EW23\ARM\INC\ -I ..\..\..\ -lC #
# C:\At91\software\projects\bench\IAR\ARM_external\List\ #
# -lA C:\At91\software\projects\bench\IAR\ARM_external\Li #
# st\ -o C:\At91\software\projects\bench\IAR\ARM_external #
# \Obj\ -e -s9 --debug --cpu_mode arm --code_model small #
# --endian little --cpu=arm7tdmi #
# C:\At91\software\projects\bench\Source\com_baud.c #
# List file = C:\At91\software\projects\bench\IAR\ARM_external\List\c #
# om_baud.lst #
# Object file = C:\At91\software\projects\bench\IAR\ARM_external\Obj\co #
# m_baud.r79 #
# #
# #
##############################################################################
C:\At91\software\projects\bench\Source\com_baud.c
1 //*----------------------------------------------------------------------------
2 //* ATMEL Microcontroller Software Support - ROUSSET -
3 //*----------------------------------------------------------------------------
4 //* The software is delivered "AS IS" without warranty or condition of any
5 //* kind, either express, implied or statutory. This includes without
6 //* limitation any warranty or condition with respect to merchantability or
7 //* fitness for any particular purpose, or against the infringements of
8 //* intellectual property rights of others.
9 //*----------------------------------------------------------------------------
10 //* File Name : com_baud.c
11 //* Object : Baud rate compute com port terminal
12 //*
13 //* 1.0 25/08/00 JPP : Creation
14 //* 1.0 03/09/01 JPP : Change com directory
15 //*----------------------------------------------------------------------------
16
17 #include "com.h"
18
19 //*----------------------------------------------------------------------------
20 //* Function Name : at91_baud_com
21 //* Object : Compute the baud rate
22 //* Input Parameters : <mcki> external mcki if use in usart US_CLKS_MCK8 you
23 //* must be divided mcki by 8
24 //* <baud> use standart baud rate 4800,9600,19200,...
25 //* Output Parameters : Usart CD baud value
26 //*----------------------------------------------------------------------------
\ In segment NEARFUNC_A, align 4
\ 00000000 CODE32
27 u_short at91_baud_com( u_int mcki, u_int baud)
28 //* Begin
29 {
\ at91_baud_com:
\ 00000000 10402DE9 STMDB SP!,{R4,LR} ;; Push
30 u_short cd;
31 u_int user_baud;
32
33 //* baud rate calculation
34 user_baud = ((mcki*10)/(baud*16));
\ 00000004 0A30A0E3 MOV R3,#+0xA
\ 00000008 900302E0 MUL R2,R0,R3
\ 0000000C 0200A0E1 MOV R0,R2
\ 00000010 0112A0E1 MOV R1,R1, LSL #+4
\ 00000014 ........ BL ??divu32_a
\ 00000018 0120A0E1 MOV R2,R1
35 //*
36 cd = user_baud/10;
\ 0000001C 0200A0E1 MOV R0,R2
\ 00000020 0310A0E1 MOV R1,R3
\ 00000024 ........ BL ??divu32_a
\ 00000028 0108A0E1 MOV R0,R1, LSL #+16
\ 0000002C 2008A0E1 MOV R0,R0, LSR #+16
37 //* compute the error
38 user_baud = (user_baud - (cd *10));
39 //* aproximation
40 if (user_baud >= 5) cd++;
\ 00000030 900304E0 MUL R4,R0,R3
\ 00000034 041042E0 SUB R1,R2,R4
\ 00000038 050051E3 CMP R1,#+0x5
\ 0000003C 01008022 ADDCS R0,R0,#+0x1
41 // return the CD value for the Usart
42 return cd;
\ 00000040 0008A0E1 MOV R0,R0, LSL #+16
\ 00000044 2008A0E1 MOV R0,R0, LSR #+16
\ 00000048 1080BDE8 LDMIA SP!,{R4,PC} ;; return
43 }
44 //* End
45 //*----------------------------------------------------------------------------
46 //* Function Name : at91_error_baud_com
47 //* Object : Compute the baud rate
48 //* Input Parameters : <mcki> external mcki if use in usart US_CLKS_MCK8 you
49 //* must be divided mcki by 8
50 //* <baud> use standart baud rate 4800,9600,19200,...
51 //* Output Parameters : baud error rate in % (sup average)
52 //*----------------------------------------------------------------------------
\ In segment NEARFUNC_A, align 4
\ 00000000 CODE32
53 u_short at91_error_baud_com( u_int mcki, u_int baud)
54 //* Begin
55 {
\ at91_error_baud_com:
\ 00000000 70402DE9 STMDB SP!,{R4-R6,LR} ;; Push
\ 00000004 0030A0E1 MOV R3,R0
\ 00000008 0120A0E1 MOV R2,R1
56 u_short cd;
57 u_int usart_baud;
58 //* Calculate the User cd
59 cd = at91_baud_com(mcki, baud);
\ 0000000C 0A10A0E3 MOV R1,#+0xA
\ 00000010 910000E0 MUL R0,R1,R0
\ 00000014 0212A0E1 MOV R1,R2, LSL #+4
\ 00000018 ........ BL ??divu32_a
\ 0000001C 0140A0E1 MOV R4,R1
\ 00000020 0400A0E1 MOV R0,R4
\ 00000024 0A10A0E3 MOV R1,#+0xA
\ 00000028 ........ BL ??divu32_a
\ 0000002C 0118A0E1 MOV R1,R1, LSL #+16
\ 00000030 2118A0E1 MOV R1,R1, LSR #+16
\ 00000034 0A50A0E3 MOV R5,#+0xA
\ 00000038 910506E0 MUL R6,R1,R5
\ 0000003C 060044E0 SUB R0,R4,R6
\ 00000040 050050E3 CMP R0,#+0x5
\ 00000044 01108122 ADDCS R1,R1,#+0x1
60
61 //* compute the real baud rate
62 usart_baud = (mcki/(cd*16));
\ 00000048 0300A0E1 MOV R0,R3
\ 0000004C 0118A0E1 MOV R1,R1, LSL #+16
\ 00000050 2118A0E1 MOV R1,R1, LSR #+16
\ 00000054 0112A0E1 MOV R1,R1, LSL #+4
\ 00000058 ........ BL ??divu32_a
63
64 //* compute error
65 if (usart_baud < (baud))
\ 0000005C 020051E1 CMP R1,R2
\ 00000060 6430A0E3 MOV R3,#+0x64
66 cd = 100 - ((usart_baud*100)/baud);
\ 00000064 91030030 MULCC R0,R1,R3
\ 00000068 0210A031 MOVCC R1,R2
67 else
68 cd = 100- ((baud*100)/usart_baud) ;
\ 0000006C 92030020 MULCS R0,R2,R3
\ 00000070 ........ BL ??divu32_a
\ 00000074 0118A0E1 MOV R1,R1, LSL #+16
\ 00000078 2118A0E1 MOV R1,R1, LSR #+16
\ 0000007C 640061E2 RSB R0,R1,#+0x64
69
70 // return the error value for the Usart
71 return cd;
\ 00000080 0008A0E1 MOV R0,R0, LSL #+16
\ 00000084 2008A0E1 MOV R0,R0, LSR #+16
\ 00000088 7080BDE8 LDMIA SP!,{R4-R6,PC} ;; return
72 }
73 //* End
Maximum stack usage in bytes:
Function CSTACK
-------- ------
at91_baud_com 8
at91_error_baud_com 16
216 bytes in segment NEARFUNC_A
216 bytes of CODE memory
Errors: none
Warnings: none
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