I'm having an issue getting strings to print properly using the RTT and the logging module. Literal strings seem to work fine. I.E. the following works perfectly:
NRF_LOG_INFO("Test\r\n");
I want to use non-literal strings. For example, the code in this guide doesn't work for me. Specifically I try to run the code:
void foo(void)
{
char string_on_stack[] = "stack";
//nrf_log_push() copies the string into the logger buffer and returns address from the logger buffer
NRF_LOG_INFO("%s",nrf_log_push(string_on_stack));
}
but in the RTT Viewer it shows up as "s" (i.e. it is literally printing the s from "%s"). Other format specifiers work properly (like %d).
I have copied the source files SEGGER_RTT_Syscalls_KEIL.c, SEGGER_RTT.c, and SEGGER_RTT_printf.c to the project.
If I include "SEGGER_RTT.h" in my file (which I dont think I should have to do) I can use SEGGER_RTT_printf and it shows up properly in RTT_Viewer.
I am wondering if somehow NRF_LOG_INFO isnt being routed into SEGGER_RTT_printf as I would expect.
In the project level defines in Keil I have defined NRF_LOG_USES_RTT=1
The relevant part of my sdk_config is here:
// <h> nRF_Log
//==========================================================
// <e> NRF_LOG_ENABLED - nrf_log - Logging
//==========================================================
#ifndef NRF_LOG_ENABLED
#define NRF_LOG_ENABLED 1
#endif
#if NRF_LOG_ENABLED
// <e> NRF_LOG_USES_COLORS - If enabled then ANSI escape code for colors is prefixed to every string
//==========================================================
#ifndef NRF_LOG_USES_COLORS
#define NRF_LOG_USES_COLORS 0
#endif
#if NRF_LOG_USES_COLORS
// <o> NRF_LOG_COLOR_DEFAULT - ANSI escape code prefix.
// <0=> Default
// <1=> Black
// <2=> Red
// <3=> Green
// <4=> Yellow
// <5=> Blue
// <6=> Magenta
// <7=> Cyan
// <8=> White
#ifndef NRF_LOG_COLOR_DEFAULT
#define NRF_LOG_COLOR_DEFAULT 0
#endif
// <o> NRF_LOG_ERROR_COLOR - ANSI escape code prefix.
// <0=> Default
// <1=> Black
// <2=> Red
// <3=> Green
// <4=> Yellow
// <5=> Blue
// <6=> Magenta
// <7=> Cyan
// <8=> White
#ifndef NRF_LOG_ERROR_COLOR
#define NRF_LOG_ERROR_COLOR 0
#endif
// <o> NRF_LOG_WARNING_COLOR - ANSI escape code prefix.
// <0=> Default
// <1=> Black
// <2=> Red
// <3=> Green
// <4=> Yellow
// <5=> Blue
// <6=> Magenta
// <7=> Cyan
// <8=> White
#ifndef NRF_LOG_WARNING_COLOR
#define NRF_LOG_WARNING_COLOR 0
#endif
#endif //NRF_LOG_USES_COLORS
// </e>
// <o> NRF_LOG_DEFAULT_LEVEL - Default Severity level
// <0=> Off
// <1=> Error
// <2=> Warning
// <3=> Info
// <4=> Debug
#ifndef NRF_LOG_DEFAULT_LEVEL
#define NRF_LOG_DEFAULT_LEVEL 3
#endif
// <e> NRF_LOG_DEFERRED - Enable deffered logger.
// <i> Log data is buffered and can be processed in idle.
//==========================================================
#ifndef NRF_LOG_DEFERRED
#define NRF_LOG_DEFERRED 1
#endif
#if NRF_LOG_DEFERRED
// <o> NRF_LOG_DEFERRED_BUFSIZE - Size of the buffer for logs in words.
// <i> Must be power of 2
#ifndef NRF_LOG_DEFERRED_BUFSIZE
#define NRF_LOG_DEFERRED_BUFSIZE 256
#endif
#endif //NRF_LOG_DEFERRED
// </e>
// <q> NRF_LOG_USES_TIMESTAMP - Enable timestamping
// <i> Function for getting the timestamp is provided by the user
#ifndef NRF_LOG_USES_TIMESTAMP
#define NRF_LOG_USES_TIMESTAMP 0
#endif
#endif //NRF_LOG_ENABLED
// </e>
// <h> nrf_log_backend - Logging sink
//==========================================================
// <o> NRF_LOG_BACKEND_MAX_STRING_LENGTH - Buffer for storing single output string
// <i> Logger backend RAM usage is determined by this value.
#ifndef NRF_LOG_BACKEND_MAX_STRING_LENGTH
#define NRF_LOG_BACKEND_MAX_STRING_LENGTH 256
#endif
// <o> NRF_LOG_TIMESTAMP_DIGITS - Number of digits for timestamp
// <i> If higher resolution timestamp source is used it might be needed to increase that
#ifndef NRF_LOG_TIMESTAMP_DIGITS
#define NRF_LOG_TIMESTAMP_DIGITS 8
#endif
// <q> NRF_LOG_BACKEND_SERIAL_USES_RTT - If enabled data is printed using RTT
#ifndef NRF_LOG_BACKEND_SERIAL_USES_RTT
#define NRF_LOG_BACKEND_SERIAL_USES_RTT 1
#endif
// </h>
//==========================================================
As another example, if I run the code:
char string_on_stack[] = "stack";
int my_num = 3;
NRF_LOG_INFO("Literal\n");
NRF_LOG_PROCESS();
NRF_LOG_INFO("my_num is %d\n", my_num);
NRF_LOG_PROCESS();
NRF_LOG_INFO("%s\n",nrf_log_push(string_on_stack));
NRF_LOG_PROCESS();
NRF_LOG_INFO("%s\n",(uint32_t)string_on_stack);
NRF_LOG_PROCESS();
SEGGER_RTT_printf(0,"%s\n", string_on_stack);
the result will be:
I am hoping I am just missing a define or something like that as I'd like to use the NRF_LOG macros.
Thanks!
