Re: how to print floating points in mynewt
This page might be worth updating since I came to the same mistaken
conclusion based on the last line here:
http://mynewt.apache.org/v1_2_0/os/modules/baselibc/ ... and implemented my
own %f solution before discovering that there IS in fact basic float
support with FLOAT_USER. :) The current implementations has limitations
like no %.08f support, but limited or not there IS limited support for it.
On Wed, Sep 5, 2018 at 7:51 PM, Rohit Gujarathi
wrote:
> Thanks Christopher!
>
>
> On Wed, Sep 5, 2018, 11:03 PM Christopher Collins
> wrote:
>
> > Hi Rohit,
> >
> > baselibc does support floating point formatting, but it is not enabled
> > by default. To enable it, set the following syscfg setting to 1 in your
> > target:
> >
> > FLOAT_USER
> >
> > baselibc's float printf support is a bit limited. In particular, it
> > ignores precision specifiers and always prints three digits after the
> > decimal point.
> >
> > Chris
> >
> > On Wed, Sep 05, 2018 at 11:00:32PM +0530, Rohit Gujarathi wrote:
> > > Hi everyone,
> > >
> > > I am trying to print floating point in mynewt using
> > > *console_printf("%f",floating_var)* but i am unable to do so. I read
> that
> > > the baselibc does not support floating point, so I tried removing the
> > > libc/baselibc from pkg.deps: in pkg.yml so that the compiler uses
> newlib
> > > but then i hit the following error:
> > > Linking /project/bin/targets/kwp1/app/apps/bme280/bme280.elf
> > >
> > Error:/project/bin/targets/kwp1/app/hw/bsp/nrf52dk/hw_
> bsp_nrf52dk.a(gcc_startup_nrf52.o):
> > > In function `.bss_zero_loop':
> > >
> > /project/repos/apache-mynewt-core/hw/bsp/nrf52dk/src/arch/
> cortex_m4/gcc_startup_nrf52.s:182:
> > > undefined reference to `_start'
> > > collect2: error: ld returned 1 exit status
> > >
> > > how can i resolve this issue?
> > >
> > > thank you
> >
>
Re: how to print floating points in mynewt
Thanks Christopher!
On Wed, Sep 5, 2018, 11:03 PM Christopher Collins wrote:
> Hi Rohit,
>
> baselibc does support floating point formatting, but it is not enabled
> by default. To enable it, set the following syscfg setting to 1 in your
> target:
>
> FLOAT_USER
>
> baselibc's float printf support is a bit limited. In particular, it
> ignores precision specifiers and always prints three digits after the
> decimal point.
>
> Chris
>
> On Wed, Sep 05, 2018 at 11:00:32PM +0530, Rohit Gujarathi wrote:
> > Hi everyone,
> >
> > I am trying to print floating point in mynewt using
> > *console_printf("%f",floating_var)* but i am unable to do so. I read that
> > the baselibc does not support floating point, so I tried removing the
> > libc/baselibc from pkg.deps: in pkg.yml so that the compiler uses newlib
> > but then i hit the following error:
> > Linking /project/bin/targets/kwp1/app/apps/bme280/bme280.elf
> >
> Error:/project/bin/targets/kwp1/app/hw/bsp/nrf52dk/hw_bsp_nrf52dk.a(gcc_startup_nrf52.o):
> > In function `.bss_zero_loop':
> >
> /project/repos/apache-mynewt-core/hw/bsp/nrf52dk/src/arch/cortex_m4/gcc_startup_nrf52.s:182:
> > undefined reference to `_start'
> > collect2: error: ld returned 1 exit status
> >
> > how can i resolve this issue?
> >
> > thank you
>
Re: how to print floating points in mynewt
Hi Rohit,
baselibc does support floating point formatting, but it is not enabled
by default. To enable it, set the following syscfg setting to 1 in your
target:
FLOAT_USER
baselibc's float printf support is a bit limited. In particular, it
ignores precision specifiers and always prints three digits after the
decimal point.
Chris
On Wed, Sep 05, 2018 at 11:00:32PM +0530, Rohit Gujarathi wrote:
> Hi everyone,
>
> I am trying to print floating point in mynewt using
> *console_printf("%f",floating_var)* but i am unable to do so. I read that
> the baselibc does not support floating point, so I tried removing the
> libc/baselibc from pkg.deps: in pkg.yml so that the compiler uses newlib
> but then i hit the following error:
> Linking /project/bin/targets/kwp1/app/apps/bme280/bme280.elf
> Error:/project/bin/targets/kwp1/app/hw/bsp/nrf52dk/hw_bsp_nrf52dk.a(gcc_startup_nrf52.o):
> In function `.bss_zero_loop':
> /project/repos/apache-mynewt-core/hw/bsp/nrf52dk/src/arch/cortex_m4/gcc_startup_nrf52.s:182:
> undefined reference to `_start'
> collect2: error: ld returned 1 exit status
>
> how can i resolve this issue?
>
> thank you
how to print floating points in mynewt
Hi everyone,
I am trying to print floating point in mynewt using
*console_printf("%f",floating_var)* but i am unable to do so. I read that
the baselibc does not support floating point, so I tried removing the
libc/baselibc from pkg.deps: in pkg.yml so that the compiler uses newlib
but then i hit the following error:
Linking /project/bin/targets/kwp1/app/apps/bme280/bme280.elf
Error:/project/bin/targets/kwp1/app/hw/bsp/nrf52dk/hw_bsp_nrf52dk.a(gcc_startup_nrf52.o):
In function `.bss_zero_loop':
/project/repos/apache-mynewt-core/hw/bsp/nrf52dk/src/arch/cortex_m4/gcc_startup_nrf52.s:182:
undefined reference to `_start'
collect2: error: ld returned 1 exit status
how can i resolve this issue?
thank you
