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/***********************************************************************/
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/* */
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/* SYSCALLS.C: System Calls */
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/* most of this is from newlib-lpc and a Keil-demo */
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/* */
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/* These are "reentrant functions" as needed by */
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/* the WinARM-newlib-config, see newlib-manual. */
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/* Collected and modified by Martin Thomas */
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/* */
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/***********************************************************************/
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#include <stdlib.h>
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#include <reent.h>
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#include <sys/stat.h>
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#include <board.h>
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static void my_putc(char c)
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{
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while (!AT91F_US_TxReady((AT91PS_USART)AT91C_BASE_DBGU));
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AT91F_US_PutChar((AT91PS_USART)AT91C_BASE_DBGU, c);
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}
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static int my_kbhit( void )
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{
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if ((AT91F_US_RxReady((AT91PS_USART)AT91C_BASE_DBGU)) == 0) return 0;
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else return 1;
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}
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static char my_getc( void )
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{
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return AT91F_US_GetChar((AT91PS_USART)AT91C_BASE_DBGU);
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}
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_ssize_t _read_r(
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struct _reent *r,
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int file,
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void *ptr,
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size_t len)
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{
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char c;
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unsigned int i;
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unsigned char *p;
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p = (unsigned char*)ptr;
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47
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for (i = 0; i < len; i++) {
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// c = uart0Getch();
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// c = uart0GetchW();
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while ( !my_kbhit() ) ;
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c = (char) my_getc();
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if (c == 0x0D) {
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*p='\0';
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break;
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}
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*p++ = c;
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////// uart0_putc(c);
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}
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return len - i;
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}
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_ssize_t _write_r (
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struct _reent *r,
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int file,
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const void *ptr,
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size_t len)
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{
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int i;
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const unsigned char *p;
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p = (const unsigned char*) ptr;
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for (i = 0; i < len; i++) {
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if (*p == '\n' ) my_putc('\r');
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my_putc(*p++);
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}
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return len;
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}
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int _close_r(
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struct _reent *r,
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int file)
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{
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return 0;
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}
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91
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_off_t _lseek_r(
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struct _reent *r,
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int file,
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_off_t ptr,
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int dir)
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{
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return (_off_t)0; /* Always indicate we are at file beginning. */
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}
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int _fstat_r(
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struct _reent *r,
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int file,
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struct stat *st)
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{
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/* Always set as character device. */
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st->st_mode = S_IFCHR;
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/* assigned to strong type with implicit */
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/* signed/unsigned conversion. Required by */
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/* newlib. */
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112
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return 0;
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}
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115
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116
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int isatty(int file); /* avoid warning */
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118
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int isatty(int file)
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{
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return 1;
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}
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#if 0
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static void _exit (int n) {
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label: goto label; /* endless loop */
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}
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#endif
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130
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131
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/* "malloc clue function" from newlib-lpc/Keil-Demo/"generic" */
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/**** Locally used variables. ****/
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// mt: "cleaner": extern char* end;
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extern char end[]; /* end is set in the linker command */
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/* file and is the end of statically */
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/* allocated data (thus start of heap). */
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139
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static char *heap_ptr; /* Points to current end of the heap. */
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141
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/************************** _sbrk_r *************************************
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* Support function. Adjusts end of heap to provide more memory to
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* memory allocator. Simple and dumb with no sanity checks.
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145
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* struct _reent *r -- re-entrancy structure, used by newlib to
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* support multiple threads of operation.
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* ptrdiff_t nbytes -- number of bytes to add.
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* Returns pointer to start of new heap area.
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150
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*
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* Note: This implementation is not thread safe (despite taking a
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* _reent structure as a parameter).
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153
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* Since _s_r is not used in the current implementation,
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154
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* the following messages must be suppressed.
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*/
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void * _sbrk_r(
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struct _reent *_s_r,
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ptrdiff_t nbytes)
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159
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{
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char *base; /* errno should be set to ENOMEM on error */
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161
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162
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if (!heap_ptr) { /* Initialize if first time through. */
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heap_ptr = end;
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164
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}
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base = heap_ptr; /* Point to end of heap. */
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166
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heap_ptr += nbytes; /* Increase heap. */
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167
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168
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return base; /* Return pointer to start of new heap area. */
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169
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}
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