some learning code trying to use libopencm3 to read values from dht11 temperature sensor
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/*********************************************************************
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* The Embedded Experts *
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* www.segger.com Support: support@segger.com *
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**********************************************************************
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* SEGGER RTT * Real Time Transfer for embedded targets *
* *
**********************************************************************
* *
* All rights reserved. *
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* SEGGER strongly recommends to not make any changes *
* to or modify the source code of this software in order to stay *
* compatible with the RTT protocol and J-Link. *
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* Redistribution and use in source and binary forms, with or *
* without modification, are permitted provided that the following *
* condition is met: *
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* o Redistributions of source code must retain the above copyright *
* notice, this condition and the following disclaimer. *
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND *
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---------------------------END-OF-HEADER------------------------------
File : SEGGER_RTT_Syscalls_GCC.c
Purpose : Low-level functions for using printf() via RTT in GCC.
To use RTT for printf output, include this file in your
application.
Revision: $Rev: 20755 $
----------------------------------------------------------------------
*/
#if (defined __GNUC__) && !(defined __SES_ARM) && !(defined __CROSSWORKS_ARM) && !(defined __ARMCC_VERSION) && !(defined __CC_ARM)
#include <reent.h> // required for _write_r
#include "SEGGER_RTT.h"
/*********************************************************************
*
* Types
*
**********************************************************************
*/
//
// If necessary define the _reent struct
// to match the one passed by the used standard library.
//
struct _reent;
/*********************************************************************
*
* Function prototypes
*
**********************************************************************
*/
_ssize_t _write (int file, const void *ptr, size_t len);
_ssize_t _write_r(struct _reent *r, int file, const void *ptr, size_t len);
/*********************************************************************
*
* Global functions
*
**********************************************************************
*/
/*********************************************************************
*
* _write()
*
* Function description
* Low-level write function.
* libc subroutines will use this system routine for output to all files,
* including stdout.
* Write data via RTT.
*/
_ssize_t _write(int file, const void *ptr, size_t len) {
(void) file; /* Not used, avoid warning */
SEGGER_RTT_Write(0, ptr, len);
return len;
}
/*********************************************************************
*
* _write_r()
*
* Function description
* Low-level reentrant write function.
* libc subroutines will use this system routine for output to all files,
* including stdout.
* Write data via RTT.
*/
_ssize_t _write_r(struct _reent *r, int file, const void *ptr, size_t len) {
(void) file; /* Not used, avoid warning */
(void) r; /* Not used, avoid warning */
SEGGER_RTT_Write(0, ptr, len);
return len;
}
#endif
/****** End Of File *************************************************/