LPC55S6x Connecting the RTC to newlib time.h using _gettimeofday()

Jelle — Thu, 06 Jul 2023 10:19:47 GMT

Hello,

I am trying to connect the onboard rtc of the LPC55S69 to the time.h functions in newlib:

I have tried defining my own _gettimeofday() function based on this forum post as follows:

#include "LPC55S69_cm33_core0.h" #include "fsl_common.h" #include "fsl_rtc.h" #include <time.h> #include <reent.h> #include "assert.h" int _gettimeofday_r(struct _reent *pReent, struct timeval *tp, void *tzvp) { assert(pReent != NULL); assert(tp != NULL); if (tp) { tp->tv_sec = RTC_GetSecondsTimerCount(RTC); // get the seconds from a clock source tp->tv_usec = 0; // get the microsconds from a clock source } return 0; } int _gettimeofday(struct timeval *tp, void *tzvp) { return _gettimeofday_r(_impure_ptr, tp, tzvp); }

However it seems to create the following error(s):

Description Resource Path Location Type
c:/nxp/mcuxpressoide_11.7.1_9221/ide/plugins/com.nxp.mcuxpresso.tools.win32_11.7.1.202301190959/tools/bin/../lib/gcc/arm-none-eabi/10.3.1/../../../../arm-none-eabi/lib/thumb/v8-m.main+fp/hard\libcr_newlib_semihost.a(syscalls.o): in function `_gettimeofday': firmware C/C++ Problem

Description Resource Path Location Type
first defined here firmware line 59 C/C++ Problem

Description Resource Path Location Type
make: *** [makefile:115: all] Error 2 firmware C/C++ Problem

Description Resource Path Location Type
make[1]: *** [makefile:124: firmware.axf] Error 1 firmware C/C++ Problem

Description Resource Path Location Type
make[1]: Target 'main-build' not remade because of errors. firmware C/C++ Problem

Is this not the correct way to define this function?

Re: LPC55S6x Connecting the RTC to newlib time.h using _gettimeofday()

xiangjun_rong — Mon, 10 Jul 2023 07:30:38 GMT

Hi,

I am not familiar with the newlib timer, I can not find out the file either

reent.h

Can you attach the reent.h file so that we can have a test.

Xiangjun Rong

Re: LPC55S6x Connecting the RTC to newlib time.h using _gettimeofday()

Jelle — Thu, 13 Jul 2023 13:47:45 GMT

Hi,

The reent.h file is supplied by the newlib library in the mcuxpresso SDK.

The original source can be found in the newlib github repository:

https://github.com/eblot/newlib/blob/master/newlib/libc/include/reent.h

On my machine it can be found at:
C:\nxp\MCUXpressoIDE_11.7.1_9221\ide\plugins\com.nxp.mcuxpresso.tools.win32_11.7.1.202301190959\tools\arm-none-eabi\include

LPC MicrocontrollersのトピックRe: LPC55S6x Connecting the RTC to newlib time.h using _gettimeofday()

LPC55S6x Connecting the RTC to newlib time.h using _gettimeofday()

Re: LPC55S6x Connecting the RTC to newlib time.h using _gettimeofday()

Re: LPC55S6x Connecting the RTC to newlib time.h using _gettimeofday()