Posted on January 21, 2015 at 00:27
I read absolutely all the posts in this forum plus some other posts online and I can't still make this work with IAR and the Terminal I/O screen.
I can however make it work using the ST-Link Utility and the Printf via SWO. But I can't have both running at the same time and I would like to debug completely with IAR.
SWO Config on debug screen:
- SWO Configuration CPU Clock set to: 144 MHz (the one that works with St-link utility)
- ITM Stimulus Ports all the 0 ports checked.
- SWO Clock: Autodetect.
General Options > Library Configuration:
- Library: Full
- Semihosted
- stdout/stderr Via SWO
ST-LINK option in IAR:
- Interface: SWD
- CPU Clock: 144MHz
- SWO Clock: Auto (2000Khz same as St-link utility)
And the code to summarize what I added:
#include ''stdio.h''
static
void
TextOut(
const
char
*str);
int
main(
void
)
{
TextOut(
''It works!''
);
}
void
TextOut(
const
char
*str)
{
do
{
if
(*str==
'\n'
) ITM_SendChar(
'\r'
);
ITM_SendChar(*str);
}
while
(*str++);
}
This works perfectly in ST-Link Utility, and I can read the ''It works!''.
But if I debug it with IAR it gets stuck inside
core_cm4.h:
__STATIC_INLINE uint32_t ITM_SendChar (uint32_t ch)
{
if
((ITM->TCR & ITM_TCR_ITMENA_Msk) &&
/* ITM enabled */
(ITM->TER & (1UL << 0) ) )
/* ITM Port #0 enabled */
{
while
(ITM->PORT[0].u32 == 0);
ITM->PORT[0].u8 = (uint8_t) ch;
}
return
(ch);
}
It gets stuck on line 6:
while
(ITM->PORT[0].u32 == 0);
And nothing shows up in the Terminal I/O screen.
Any ideas why is this happening? And why the exact same code would work on ST-Link Utility?
Thanks
