Re: Hard faults using sprintf() and float

[Sebastian Huber <sebastian.huber@embedded-brains.de>]

Looks like you have a problem with misaligned loads. Check your MPU 
configuration.

On 24/03/17 09:34, Jochen Strohbeck wrote:
> Hello,
> I'm using newlib 2.4.0 as provided by the ASF / Atmel Studio
> Installation. I'm on a SAME70 and my app is heavily using float32 and
> therefore I'm interested in using printf and co. in my FreeRTOS / lwip
> environment. Now it seems to me that there is a problem in memory
> allocation stuff but I can't get deeper. Looks like sprintf with "%.3e"
> format string results in a hard fault which I tracked down to the newlib
> library. Any idea what I can do ?
> Regards
>
> In Hard Fault Handler
> SCB->HFSR = 0x40000000
> Forced Hard Fault
> SCB->CFSR = 0x00008200
> Bus fault:
> r0 = 0x36353931
> r1 = 0x00000000
> r2 = 0x00000004
> r3 = 0x2040b970
> r12 = 0xfadffbfe
> lr = 0x004461ff
> pc = 0x00447128 <-- !!
> psr = 0x81010000
>
> _Balloc():
>   447118: 6cc3 ldr r3, [r0, #76] ; 0x4c
> :
>   447126: b180 cbz r0, 44714a <_Balloc+0x32>
>   447128: 6802 ldr r2, [r0, #0] <-- !!
>   44712a: f843 2024 str.w r2, [r3, r4, lsl #2]
> :
>   44715e: 6044 str r4, [r0, #4]
>   447160: 6086 str r6, [r0, #8]
>   447162: e7e4 b.n 44712e <_Balloc+0x16>

-- 
Sebastian Huber, embedded brains GmbH

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