I am using inline assembly in C but i am getting a warning as
"UNRESOLVED EXTERNAL SYMBOL".The code is executing but i am getting
only the warning. I set all these options:
Generate assembler SRC file
Assemble SRC file
Include in Target Bu…
I am using inline assembly in C but i am getting a warning as
"UNRESOLVED EXTERNAL SYMBOL".The code is executing but i am getting
only the warning. I set all these options:
Generate assembler SRC file
Assemble SRC file
Include in Target Bu…
Can someone give some explains on when to declare a variable to be static? What is the difference with extern one?
I've identified all but two bits in the word value that results from register use. The obvious ones are:
R0-R7
DPH
DPL
PSW
ACC
B
CY
These are assigned to the lower 14 bits of the word (order unimportant for this discussion)
None of the registers…
What is the effect of an RTX Tiny context switch (via specifying a non-zero TIMESHARING value in Conf_tny.A51) on non-reentrant functions?
I would assume that functions documented as reentrant will be OK, but is it safe to assume all non-reentrant functions…
who can tell me some usefull websites or forums about Hardware,electric ,mcu ,dsp,cpld and so on.Not english language is
also valid.
TO tell me where you go to often. thanks to every one who reples.
the keil can detect the interrupt ,but can't run into the interrupt function !
thank you !
//my program ! use DS89C420 MICRO CHIP!
#include "reg420.h"
unsigned int count;
void ini_INT12(void);
main()
{
ini_INT12();
while(1);
}
I can't step over this instruction ( while(TI==0);// )
the program :
#include "reg51.h"
main()
{
TCON = 0x50;
TMOD = 0x20;
TL1 = 0xFD;
TH1 = 0xFD;
TR1 = 1;
while(1)
{
SBUF = 0xFF;
while(TI==0);// I can't step over here .
TI…Hello everyone!
I am sure this could be a ridiculous question - but I would love the educated minds of the forum to impart their wisdom.
Is there any difference in operation or performance of using the Programmable Counter Array capturing on the…
Hi All,
I have 3 source files: file1.c, file2.c and file3.c and 1 header file config.h.
When I built entire uvision project, 3 object files got generated. file1.obj, file2.obj, file3.obj.
Now I re-build the project & generate hex by changing variables…
hi,
i have some doubts in bin file creation for at89s52.
how to create bin file from hex file using keil uv4?
or shall i program direct hex file created by keil?
or shall i program the output file (without extension) created by
keil?
thanks
Hello all,
This is a really strange problem i have just encountered.
to simplify i am trying to load values AABB CCDD EEFF into the pca capture regs.
So the code to do this should simply be:
PCA0CPL0 = 0xBB; PCA0CPL1 = 0xDD; PCA0CPL2 = 0xFF; PCA0CPH0…
Hi,
I downloaded the toolset V9.51 file 'c51v951.exe' and installed it. Using ultraedit version '13.20+2' using Windows7.
I configured the Linker through the 'Advanced > Tool Configuration' menu.
The command line is like…
Quite often I'll code some of my modules entirely in A51 assembly and, to be thorough, I always fill out the $REGUSE statement for all functions. A module written like this will then provide the necessary information to the compiler for global register…
I am using C51 compiler V7.50 I don't know if this 'works' on other versions however I was able to crash the compiler by this 'silly' macro usage
// causes compiler to crash #define WORD_SIZE(N) (sizeof((N))/sizeof(uint16_t)) /…
I haven't found a response to my brownout issues yet using the LPC936. Maybe I won't. It doesn't seem as though this is a chip many people use anymore. We've used this for over 10 years on a working system, and I was trying to get a new brownout feature…
Anyone have experience with the Brownout Detect feature on the LPC936 chip? I have a complete system that works fine. I decided to try out the Brownout feature. Anytime I turn on BOE bit (done thru FlashMagic) or EBO bit, my system stops. I figured out…
#include<softuart.h> #include<stdio.h> #include<reg51.h> void uart_init(); sbit sw=P1^7; unsigned char rx(); code unsigned char rd[] = "AT+CMGR=1"; code unsigned char ne[] = "AT+CNMI=2,2,0,0,0"; unsigned int r=0,m=0,s1=0,n1=0,f1=0,m2=0; unsigned char…
Hello!
A function here starts like this:
uchar uc_Check_Limits(uchar pdata *ptr_Set,struct st_Limit code *ptr_Limit)small reentrant
{
union INT_CHAR data Value;
uint uiLimit;
// typ of limit
EA=0;
Value.byte…Hello,
I have include a c file with #pragma SRC
after a build of my target, I have include the .src file in the
projet for future use.
but after all build (compilation) of the target, I have a BL51: WARNING 7 (MODULE NAME NOT UNIQUE)
I think that…
From Cx51 User's guide, I learned that:
The simulated stack area for reentrant functions is organized from
top to bottom—it stacks down. The 8051 hardware stack is just
the opposite and is organized bottom to top—it stacks up. When
using the SMALL…
Dear all,
I encountered one problem about "executing self-defined 32bit
shift-left routine too long"...
That is, I built my own routine to execute 32-bit shift left operation and found it takes too long(Due to some reason 32bit shift left…
I am trying to use flash memory to store one byte of data in a P89LPC922 and am using a EPM900 to debug my application. The map file shows that the address I am using is not used by my application code. My flash programming function (taken from the device…
Hi!,
I've written a code for I2C communication which works fine for almost all I2C devices. Now I'm using the same code for using with AT24c512 EEPROM. I can read and write a byte to it perfecty.
When I try to read memory locations greater…
Dear all,
I have one question about the _DATA_GROUP_ in DATA MEMORY in m51
file.
The current DATA MEMORY is as follows:
REG 0000H 0008H ABSOLUTE "REG BANK 0" DATA 0008H 000DH UNIT ?DT?A DATA 0015H 0008H …
Hello,
I have a banked application using the BL51 linker. I am using a Silabs C8051F120 processor, which has four 32K banks. I'm using all of them. I am writing a bootloader to upgrade the firmware using an external uart.
I am looking at the…