511 lines
15 KiB
C
511 lines
15 KiB
C
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/*********************************************************************
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* SEGGER MICROCONTROLLER GmbH & Co. KG *
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* Solutions for real time microcontroller applications *
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**********************************************************************
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* *
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* (c) 2014 - 2015 SEGGER Microcontroller GmbH & Co. KG *
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* *
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* www.segger.com Support: support@segger.com *
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* *
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**********************************************************************
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* *
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* All rights reserved. *
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* *
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* * This software may in its unmodified form be freely redistributed *
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* in source form. *
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* * The source code may be modified, provided the source code *
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* retains the above copyright notice, this list of conditions and *
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* the following disclaimer. *
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* * Modified versions of this software in source or linkable form *
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* may not be distributed without prior consent of SEGGER. *
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* * This software may only be used for communication with SEGGER *
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* J-Link debug probes. *
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* *
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND *
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* CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, *
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* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF *
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE *
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* DISCLAIMED. IN NO EVENT SHALL SEGGER Microcontroller BE LIABLE FOR *
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* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR *
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT *
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* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; *
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* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF *
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT *
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE *
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* USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH *
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* DAMAGE. *
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* *
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**********************************************************************
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---------------------------END-OF-HEADER------------------------------
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File : SEGGER_RTT_printf.c
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Purpose : Replacement for printf to write formatted data via RTT
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----------------------------------------------------------------------
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*/
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#include "segger-rtt.h"
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#include "segger-rtt-conf.h"
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/*********************************************************************
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*
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* Defines, configurable
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*
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**********************************************************************
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*/
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#ifndef SEGGER_RTT_PRINTF_BUFFER_SIZE
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#define SEGGER_RTT_PRINTF_BUFFER_SIZE (64)
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#endif
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#include <stdlib.h>
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#include <stdarg.h>
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#define FORMAT_FLAG_LEFT_JUSTIFY (1u << 0)
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#define FORMAT_FLAG_PAD_ZERO (1u << 1)
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#define FORMAT_FLAG_PRINT_SIGN (1u << 2)
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#define FORMAT_FLAG_ALTERNATE (1u << 3)
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/*********************************************************************
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*
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* Types
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*
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**********************************************************************
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*/
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typedef struct {
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char* pBuffer;
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unsigned BufferSize;
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unsigned Cnt;
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int ReturnValue;
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unsigned RTTBufferIndex;
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} SEGGER_RTT_PRINTF_DESC;
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/*********************************************************************
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*
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* Function prototypes
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*
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**********************************************************************
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*/
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int SEGGER_RTT_vprintf(unsigned BufferIndex, const char * sFormat, va_list * pParamList);
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/*********************************************************************
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*
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* Static code
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*
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**********************************************************************
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*/
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/*********************************************************************
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*
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* _StoreChar
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*/
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static void _StoreChar(SEGGER_RTT_PRINTF_DESC * p, char c) {
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unsigned Cnt;
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Cnt = p->Cnt;
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if ((Cnt + 1u) <= p->BufferSize) {
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*(p->pBuffer + Cnt) = c;
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p->Cnt = Cnt + 1u;
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p->ReturnValue++;
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}
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//
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// Write part of string, when the buffer is full
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//
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if (p->Cnt == p->BufferSize) {
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if (SEGGER_RTT_Write(p->RTTBufferIndex, p->pBuffer, p->Cnt) != p->Cnt) {
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p->ReturnValue = -1;
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} else {
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p->Cnt = 0u;
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}
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}
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}
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/*********************************************************************
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*
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* _PrintUnsigned
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*/
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static void _PrintUnsigned(SEGGER_RTT_PRINTF_DESC * pBufferDesc, unsigned v, unsigned Base, unsigned NumDigits, unsigned FieldWidth, unsigned FormatFlags) {
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static const char _aV2C[16] = {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F' };
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unsigned Div;
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unsigned Digit;
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unsigned Number;
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unsigned Width;
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char c;
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Number = v;
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Digit = 1u;
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//
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// Get actual field width
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//
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Width = 1u;
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while (Number >= Base) {
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Number = (Number / Base);
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Width++;
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}
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if (NumDigits > Width) {
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Width = NumDigits;
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}
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//
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// Print leading chars if necessary
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//
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if ((FormatFlags & FORMAT_FLAG_LEFT_JUSTIFY) == 0u) {
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if (FieldWidth != 0u) {
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if (((FormatFlags & FORMAT_FLAG_PAD_ZERO) == FORMAT_FLAG_PAD_ZERO) && (NumDigits == 0u)) {
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c = '0';
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} else {
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c = ' ';
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}
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while ((FieldWidth != 0u) && (Width < FieldWidth)) {
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FieldWidth--;
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_StoreChar(pBufferDesc, c);
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if (pBufferDesc->ReturnValue < 0) {
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break;
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}
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}
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}
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}
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if (pBufferDesc->ReturnValue >= 0) {
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//
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// Compute Digit.
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// Loop until Digit has the value of the highest digit required.
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// Example: If the output is 345 (Base 10), loop 2 times until Digit is 100.
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//
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while (1) {
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if (NumDigits > 1u) { // User specified a min number of digits to print? => Make sure we loop at least that often, before checking anything else (> 1 check avoids problems with NumDigits being signed / unsigned)
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NumDigits--;
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} else {
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Div = v / Digit;
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if (Div < Base) { // Is our divider big enough to extract the highest digit from value? => Done
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break;
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}
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}
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Digit *= Base;
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}
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//
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// Output digits
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//
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do {
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Div = v / Digit;
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v -= Div * Digit;
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_StoreChar(pBufferDesc, _aV2C[Div]);
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if (pBufferDesc->ReturnValue < 0) {
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break;
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}
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Digit /= Base;
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} while (Digit);
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//
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// Print trailing spaces if necessary
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//
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if ((FormatFlags & FORMAT_FLAG_LEFT_JUSTIFY) == FORMAT_FLAG_LEFT_JUSTIFY) {
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if (FieldWidth != 0u) {
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while ((FieldWidth != 0u) && (Width < FieldWidth)) {
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FieldWidth--;
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_StoreChar(pBufferDesc, ' ');
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if (pBufferDesc->ReturnValue < 0) {
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break;
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}
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}
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}
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}
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}
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}
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/*********************************************************************
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*
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* _PrintInt
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*/
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static void _PrintInt(SEGGER_RTT_PRINTF_DESC * pBufferDesc, int v, unsigned Base, unsigned NumDigits, unsigned FieldWidth, unsigned FormatFlags) {
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unsigned Width;
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int Number;
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Number = (v < 0) ? -v : v;
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//
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// Get actual field width
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//
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Width = 1u;
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while (Number >= (int)Base) {
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Number = (Number / (int)Base);
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Width++;
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}
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if (NumDigits > Width) {
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Width = NumDigits;
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}
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if ((FieldWidth > 0u) && ((v < 0) || ((FormatFlags & FORMAT_FLAG_PRINT_SIGN) == FORMAT_FLAG_PRINT_SIGN))) {
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FieldWidth--;
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}
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//
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// Print leading spaces if necessary
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//
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if ((((FormatFlags & FORMAT_FLAG_PAD_ZERO) == 0u) || (NumDigits != 0u)) && ((FormatFlags & FORMAT_FLAG_LEFT_JUSTIFY) == 0u)) {
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if (FieldWidth != 0u) {
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while ((FieldWidth != 0u) && (Width < FieldWidth)) {
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FieldWidth--;
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_StoreChar(pBufferDesc, ' ');
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if (pBufferDesc->ReturnValue < 0) {
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break;
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}
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}
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}
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}
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//
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// Print sign if necessary
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//
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if (pBufferDesc->ReturnValue >= 0) {
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if (v < 0) {
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v = -v;
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_StoreChar(pBufferDesc, '-');
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} else if ((FormatFlags & FORMAT_FLAG_PRINT_SIGN) == FORMAT_FLAG_PRINT_SIGN) {
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_StoreChar(pBufferDesc, '+');
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} else {
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}
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if (pBufferDesc->ReturnValue >= 0) {
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//
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// Print leading zeros if necessary
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//
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if (((FormatFlags & FORMAT_FLAG_PAD_ZERO) == FORMAT_FLAG_PAD_ZERO) && ((FormatFlags & FORMAT_FLAG_LEFT_JUSTIFY) == 0u) && (NumDigits == 0u)) {
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if (FieldWidth != 0u) {
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while ((FieldWidth != 0u) && (Width < FieldWidth)) {
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FieldWidth--;
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_StoreChar(pBufferDesc, '0');
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if (pBufferDesc->ReturnValue < 0) {
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break;
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}
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}
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}
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}
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if (pBufferDesc->ReturnValue >= 0) {
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//
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// Print number without sign
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//
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_PrintUnsigned(pBufferDesc, (unsigned)v, Base, NumDigits, FieldWidth, FormatFlags);
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}
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}
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}
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}
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/*********************************************************************
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*
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* Public code
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*
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**********************************************************************
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*/
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/*********************************************************************
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*
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* SEGGER_RTT_vprintf
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*
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* Function description
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* Stores a formatted string in SEGGER RTT control block.
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* This data is read by the host.
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*
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* Parameters
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* BufferIndex Index of "Up"-buffer to be used. (e.g. 0 for "Terminal")
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* sFormat Pointer to format string
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* pParamList Pointer to the list of arguments for the format string
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*
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* Return values
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* >= 0: Number of bytes which have been stored in the "Up"-buffer.
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* < 0: Error
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*/
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int SEGGER_RTT_vprintf(unsigned BufferIndex, const char * sFormat, va_list * pParamList) {
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char c;
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SEGGER_RTT_PRINTF_DESC BufferDesc;
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int v;
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unsigned NumDigits;
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unsigned FormatFlags;
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unsigned FieldWidth;
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char acBuffer[SEGGER_RTT_PRINTF_BUFFER_SIZE];
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BufferDesc.pBuffer = acBuffer;
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BufferDesc.BufferSize = SEGGER_RTT_PRINTF_BUFFER_SIZE;
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BufferDesc.Cnt = 0u;
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BufferDesc.RTTBufferIndex = BufferIndex;
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BufferDesc.ReturnValue = 0;
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do {
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c = *sFormat;
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sFormat++;
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if (c == 0u) {
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break;
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}
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if (c == '%') {
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//
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// Filter out flags
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//
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FormatFlags = 0u;
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v = 1;
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do {
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c = *sFormat;
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switch (c) {
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case '-': FormatFlags |= FORMAT_FLAG_LEFT_JUSTIFY; sFormat++; break;
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case '0': FormatFlags |= FORMAT_FLAG_PAD_ZERO; sFormat++; break;
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case '+': FormatFlags |= FORMAT_FLAG_PRINT_SIGN; sFormat++; break;
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case '#': FormatFlags |= FORMAT_FLAG_ALTERNATE; sFormat++; break;
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default: v = 0; break;
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}
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} while (v);
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//
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// filter out field with
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//
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FieldWidth = 0u;
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do {
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c = *sFormat;
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if ((c < '0') || (c > '9')) {
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break;
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}
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sFormat++;
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FieldWidth = (FieldWidth * 10u) + ((unsigned)c - '0');
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} while (1);
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//
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// Filter out precision (number of digits to display)
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//
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NumDigits = 0u;
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c = *sFormat;
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if (c == '.') {
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sFormat++;
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do {
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c = *sFormat;
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if (c == '*') {
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sFormat++;
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v = va_arg(*pParamList, int);
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NumDigits = (unsigned)v;
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break;
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}
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if ((c < '0') || (c > '9')) {
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break;
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}
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sFormat++;
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NumDigits = NumDigits * 10u + ((unsigned)c - '0');
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} while (1);
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}
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//
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// Filter out length modifier
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//
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c = *sFormat;
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do {
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if ((c == 'l') || (c == 'h')) {
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c = *sFormat;
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sFormat++;
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} else {
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break;
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}
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} while (1);
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||
|
|
//
|
||
|
|
// Handle specifiers
|
||
|
|
//
|
||
|
|
switch (c) {
|
||
|
|
case 'c': {
|
||
|
|
char c0;
|
||
|
|
v = va_arg(*pParamList, int);
|
||
|
|
c0 = (char)v;
|
||
|
|
_StoreChar(&BufferDesc, c0);
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
case 'd':
|
||
|
|
v = va_arg(*pParamList, int);
|
||
|
|
_PrintInt(&BufferDesc, v, 10u, NumDigits, FieldWidth, FormatFlags);
|
||
|
|
break;
|
||
|
|
case 'u':
|
||
|
|
v = va_arg(*pParamList, int);
|
||
|
|
_PrintUnsigned(&BufferDesc, (unsigned)v, 10u, NumDigits, FieldWidth, FormatFlags);
|
||
|
|
break;
|
||
|
|
case 'x':
|
||
|
|
case 'X':
|
||
|
|
v = va_arg(*pParamList, int);
|
||
|
|
_PrintUnsigned(&BufferDesc, (unsigned)v, 16u, NumDigits, FieldWidth, FormatFlags);
|
||
|
|
break;
|
||
|
|
case 's':
|
||
|
|
{
|
||
|
|
const char * s = va_arg(*pParamList, const char *);
|
||
|
|
if (NumDigits > 0) {
|
||
|
|
do {
|
||
|
|
c = *s;
|
||
|
|
s++;
|
||
|
|
if (NumDigits == 0) {
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
NumDigits--;
|
||
|
|
_StoreChar(&BufferDesc, c);
|
||
|
|
} while (BufferDesc.ReturnValue >= 0);
|
||
|
|
} else {
|
||
|
|
do {
|
||
|
|
c = *s;
|
||
|
|
s++;
|
||
|
|
if (c == '\0' || NumDigits == 0) {
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
_StoreChar(&BufferDesc, c);
|
||
|
|
} while (BufferDesc.ReturnValue >= 0);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
break;
|
||
|
|
case 'p':
|
||
|
|
v = va_arg(*pParamList, int);
|
||
|
|
_PrintUnsigned(&BufferDesc, (unsigned)v, 16u, 8u, 8u, 0u);
|
||
|
|
break;
|
||
|
|
case '%':
|
||
|
|
_StoreChar(&BufferDesc, '%');
|
||
|
|
break;
|
||
|
|
default:
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
sFormat++;
|
||
|
|
} else {
|
||
|
|
_StoreChar(&BufferDesc, c);
|
||
|
|
}
|
||
|
|
} while (BufferDesc.ReturnValue >= 0);
|
||
|
|
|
||
|
|
if (BufferDesc.ReturnValue > 0) {
|
||
|
|
//
|
||
|
|
// Write remaining data, if any
|
||
|
|
//
|
||
|
|
if (BufferDesc.Cnt != 0u) {
|
||
|
|
SEGGER_RTT_Write(BufferIndex, acBuffer, BufferDesc.Cnt);
|
||
|
|
}
|
||
|
|
BufferDesc.ReturnValue += (int)BufferDesc.Cnt;
|
||
|
|
}
|
||
|
|
return BufferDesc.ReturnValue;
|
||
|
|
}
|
||
|
|
|
||
|
|
/*********************************************************************
|
||
|
|
*
|
||
|
|
* SEGGER_RTT_printf
|
||
|
|
*
|
||
|
|
* Function description
|
||
|
|
* Stores a formatted string in SEGGER RTT control block.
|
||
|
|
* This data is read by the host.
|
||
|
|
*
|
||
|
|
* Parameters
|
||
|
|
* BufferIndex Index of "Up"-buffer to be used. (e.g. 0 for "Terminal")
|
||
|
|
* sFormat Pointer to format string, followed by the arguments for conversion
|
||
|
|
*
|
||
|
|
* Return values
|
||
|
|
* >= 0: Number of bytes which have been stored in the "Up"-buffer.
|
||
|
|
* < 0: Error
|
||
|
|
*
|
||
|
|
* Notes
|
||
|
|
* (1) Conversion specifications have following syntax:
|
||
|
|
* %[flags][FieldWidth][.Precision]ConversionSpecifier
|
||
|
|
* (2) Supported flags:
|
||
|
|
* -: Left justify within the field width
|
||
|
|
* +: Always print sign extension for signed conversions
|
||
|
|
* 0: Pad with 0 instead of spaces. Ignored when using '-'-flag or precision
|
||
|
|
* Supported conversion specifiers:
|
||
|
|
* c: Print the argument as one char
|
||
|
|
* d: Print the argument as a signed integer
|
||
|
|
* u: Print the argument as an unsigned integer
|
||
|
|
* x: Print the argument as an hexadecimal integer
|
||
|
|
* s: Print the string pointed to by the argument
|
||
|
|
* p: Print the argument as an 8-digit hexadecimal integer. (Argument shall be a pointer to void.)
|
||
|
|
*/
|
||
|
|
int SEGGER_RTT_printf(unsigned BufferIndex, const char * sFormat, ...) {
|
||
|
|
va_list ParamList;
|
||
|
|
|
||
|
|
va_start(ParamList, sFormat);
|
||
|
|
return SEGGER_RTT_vprintf(BufferIndex, sFormat, &ParamList);
|
||
|
|
}
|
||
|
|
/*************************** End of file ****************************/
|