Part Number: AM5728
Tool/software: TI C/C++ Compiler
Dear Champs,
My customer is trying to test 'variable argument' in the C66x DSP code as below.
~~~~~~~~~
#include "stdint.h"
#include <stdarg.h>
void my_printf( const char *szFormat, ...)
{
va_list vaArgs;
va_start(vaArgs, szFormat);
UART_printf( szFormat, vaArgs );
va_end(vaArgs);
}
char cT1Char = 'A';
char szT1Str[20] = "HIJKLMN";
uint32_t nT1Int = 256;
void xstdio_t1( UArg arg0, UArg arg1 )
{
UART_printf("=======================\n\n");
UART_printf("Test Uart\n");
UART_printf("i: %d\n", nT1Int);
UART_printf("c: %c\n", cT1Char);
UART_printf("s: %s\n", szT1Str);
UART_printf("i: %d c: %c s: %s\n", nT1Int, cT1Char, szT1Str);
UART_printf("-----------------------\n\n");
my_printf("Test my\n");
my _printf("i: %d\n", nT1Int);
my _printf("c: %c\n", cT1Char);
my _printf("s: %s\n", szT1Str);
my _printf("i: %d c: %c s: %s\n", nT1Int, cT1Char, szT1Str);
UART_printf("-----------------------\n\n");
UART_printf("Test Uart\n");
UART_printf("i: %d\n", nT1Int);
UART_printf("c: %c\n", cT1Char);
UART_printf("s: %s\n", szT1Str);
UART_printf("i: %d c: %c s: %s\n", nT1Int, cT1Char, szT1Str);
UART_printf("-----------------------\n\n");
}
~~~~~~~~~
The result is as below.
~~~~~~~~~
Test Uart
i: 256
c: A
s: HIJKLMN
i: 256 c: A s: HIJKLMN
-----------------------
Test my
i: 5
c:
s: ?
i: 5 c: s: 챱
-----------------------
Test Uart
i: 256
c: A
s: HIJKLMN
i: 256 c: A s: HIJKLMN
-----------------------
~~~~~~~~~
Could you please let me know what is the issue and how they can resolve this issue in C66x DSP?
Actually, I found below e2e and I thought this was calling convention issue and suggested to use below.
use
UART_printf(szFormat, va_arg(vaArgs, int) );
instead of
UART_printf( szFormat, vaArgs );
in above code.
But, even when use 'va_arg()' macro, they are still facing issue and the result is as below.
~~~~~~~~~~~
Test my
i: 1
c:
s:
i: 1 c:
s: 챪r
~~~~~~~~~~~
Please help on this.
Their SW is pdk1.0.17 as below.
- PDK : pdk_am57xx_1_0_17
- NDK : 3.61.1.01
- SYS/BIOS : 6.76.3.01.
The C6000 compiler used is TI compiler v8.3.7.
Thanks and Best Regards,
SI.
