Bluepill (STM32F103) + NeoPixel version of the Simon game
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stm32f103-simon/User/utils/syscalls.c

83 lines
1.2 KiB

#include <errno.h>
#include <stdio.h>
#include <usart.h>
#include <sys/stat.h>
register char *stack_ptr asm("sp");
caddr_t _sbrk(int incr)
{
extern char end __asm("end");
static char *heap_end;
char *prev_heap_end;
if (heap_end == 0)
heap_end = &end;
prev_heap_end = heap_end;
if (heap_end + incr > stack_ptr) {
// write(1, "Heap and stack collision\n", 25);
// abort();
errno = ENOMEM;
return (caddr_t) -1;
}
heap_end += incr;
return (caddr_t) prev_heap_end;
}
/**
* @brief Write to a file by file descriptor.
*
* @param fd : open file descriptor
* @param buf : data to write
* @param len : buffer size
* @return number of written bytes
*/
int _write(int fd, const char *buf, int len)
{
switch (fd) {
case 1: // stdout
case 2: // stderr
HAL_UART_Transmit(&huart1, (uint8_t*)buf, len, 10);
return len;
default:
return 0;
}
}
// region stubs
int _read(int fd, char *buf, int len)
{
return 0;
}
int _fstat(int file, struct stat *st)
{
st->st_mode = S_IFCHR;
return 0;
}
int _lseek(int file, int ptr, int dir)
{
return 0;
}
int _close(int file)
{
return -1;
}
int _isatty(int fd)
{
if (fd == 0 || fd == 1 || fd == 2)
return 1;
else
return 0;
}
// endregion