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444 lines
12 KiB
C
444 lines
12 KiB
C
/*********************************************************************
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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) 2014-2014 SEGGER Microcontroller GmbH & Co. KG *
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* *
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* Internet: www.segger.com Support: support@segger.com *
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* *
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**********************************************************************
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----------------------------------------------------------------------
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File : SEGGER_RTT_printf.c
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Date : 17 Dec 2014
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Purpose : Replacement for printf to write formatted data via RTT
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---------------------------END-OF-HEADER------------------------------
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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 (1 << 0)
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#define FORMAT_FLAG_PAD_ZERO (1 << 1)
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#define FORMAT_FLAG_PRINT_SIGN (1 << 2)
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#define FORMAT_FLAG_ALTERNATE (1 << 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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int BufferSize;
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int 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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int Cnt;
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Cnt = p->Cnt;
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if ((Cnt + 1) <= p->BufferSize) {
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*(p->pBuffer + Cnt) = c;
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p->Cnt = Cnt + 1;
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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 = 0;
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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, int 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 = 1;
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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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//
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// Get actual field width
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//
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Width = 1;
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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 ((unsigned)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) == 0) {
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if (FieldWidth != 0) {
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if (((FormatFlags & FORMAT_FLAG_PAD_ZERO) == FORMAT_FLAG_PAD_ZERO) && (NumDigits == 0)) {
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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 != 0) && (Width < FieldWidth--)) {
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_StoreChar(pBufferDesc, c);
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if (pBufferDesc->ReturnValue < 0) {
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return;
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}
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}
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}
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}
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//
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// Count how many digits are required by precision
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//
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while (((v / Digit) >= Base) | (NumDigits-- > 1)) {
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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 != 0) {
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while ((FieldWidth != 0) && (Width < FieldWidth--)) {
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_StoreChar(pBufferDesc, ' ');
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if (pBufferDesc->ReturnValue < 0) {
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return;
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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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unsigned 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 = 1;
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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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if ((FieldWidth > 0) && ((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) == 0) || (NumDigits != 0)) && ((FormatFlags & FORMAT_FLAG_LEFT_JUSTIFY) == 0)) {
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if (FieldWidth != 0) {
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while ((FieldWidth != 0) && (Width < FieldWidth--)) {
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_StoreChar(pBufferDesc, ' ');
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if (pBufferDesc->ReturnValue < 0) {
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return;
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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 (v < 0) {
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v = -v;
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_StoreChar(pBufferDesc, '-');
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if (pBufferDesc->ReturnValue < 0) {
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return;
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}
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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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if (pBufferDesc->ReturnValue < 0) {
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return;
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}
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}
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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) == 0) && (NumDigits == 0)) {
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if (FieldWidth != 0) {
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while ((FieldWidth != 0) && (Width < FieldWidth--)) {
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_StoreChar(pBufferDesc, '0');
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if (pBufferDesc->ReturnValue < 0) {
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return;
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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 number without sign
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//
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_PrintUnsigned(pBufferDesc, v, Base, NumDigits, FieldWidth, FormatFlags);
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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 = 0;
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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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if (c == 0) {
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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 = 0;
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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: goto FilterFieldWidth; break;
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}
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} while (1);
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//
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// filter out field with
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//
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FilterFieldWidth:
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FieldWidth = 0;
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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 * 10 + (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 = 0;
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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 < '0' || c > '9') {
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break;
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}
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sFormat++;
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NumDigits = NumDigits * 10 + (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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continue;
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}
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break;
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} while (1);
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//
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// Handle specifiers
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//
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switch (c) {
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case 'c': {
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char c0;
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v = va_arg(*pParamList, int);
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c0 = (char)v;
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_StoreChar(&BufferDesc, c0);
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break;
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}
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case 'd':
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v = va_arg(*pParamList, int);
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_PrintInt(&BufferDesc, v, 10, NumDigits, FieldWidth, FormatFlags);
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break;
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case 'u':
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v = va_arg(*pParamList, int);
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_PrintUnsigned(&BufferDesc, v, 10, NumDigits, FieldWidth, FormatFlags);
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break;
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case 'x':
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case 'X':
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v = va_arg(*pParamList, int);
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_PrintUnsigned(&BufferDesc, v, 16, NumDigits, FieldWidth, FormatFlags);
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break;
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case 's':
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{
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const char * s = va_arg(*pParamList, const char *);
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do {
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c = *s++;
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if (c == 0) {
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break;
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}
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_StoreChar(&BufferDesc, c);
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} while (BufferDesc.ReturnValue >= 0);
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}
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break;
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case 'p':
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v = va_arg(*pParamList, int);
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_PrintUnsigned(&BufferDesc, v, 16, 8, 8, 0);
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break;
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case '%':
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_StoreChar(&BufferDesc, '%');
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break;
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}
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sFormat++;
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} else {
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_StoreChar(&BufferDesc, c);
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}
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} while (BufferDesc.ReturnValue >= 0);
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if (BufferDesc.ReturnValue > 0) {
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//
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// Write remaining data, if any
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//
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if (BufferDesc.Cnt != 0) {
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SEGGER_RTT_Write(BufferIndex, acBuffer, BufferDesc.Cnt);
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}
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BufferDesc.ReturnValue += BufferDesc.Cnt;
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}
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return BufferDesc.ReturnValue;
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}
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/*********************************************************************
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*
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* SEGGER_RTT_printf
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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, followed by the arguments for conversion
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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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* Notes
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* (1) Conversion specifications have following syntax:
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* %[flags][FieldWidth][.Precision]ConversionSpecifier
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* (2) Supported flags:
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* -: Left justify within the field width
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* +: Always print sign extension for signed conversions
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* 0: Pad with 0 instead of spaces. Ignored when using '-'-flag or precision
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* Supported conversion specifiers:
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* c: Print the argument as one char
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* d: Print the argument as a signed integer
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* u: Print the argument as an unsigned integer
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* x: Print the argument as an hexadecimal integer
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* s: Print the string pointed to by the argument
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* p: Print the argument as an 8-digit hexadecimal integer. (Argument shall be a pointer to void.)
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*/
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int SEGGER_RTT_printf(unsigned BufferIndex, const char * sFormat, ...) {
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va_list ParamList;
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va_start(ParamList, sFormat);
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return SEGGER_RTT_vprintf(BufferIndex, sFormat, &ParamList);
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}
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/*************************** End of file ****************************/
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