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uart printf

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Imbus 2025-07-16 18:09:24 +02:00
parent 7086e5f9e9
commit 89472640cb
1 changed files with 39 additions and 0 deletions
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39
uart.c
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@ -5,6 +5,9 @@
#include <libopencm3/stm32/rcc.h> #include <libopencm3/stm32/rcc.h>
#include <libopencm3/stm32/usart.h> #include <libopencm3/stm32/usart.h>
#include <stdio.h> #include <stdio.h>
#include <sys/stat.h>
#include <unistd.h>
#include <unistd.h> #include <unistd.h>
int _write(int file, char *ptr, int len); int _write(int file, char *ptr, int len);
@ -36,3 +39,39 @@ int _write(int file, char *ptr, int len) {
errno = EIO; errno = EIO;
return -1; return -1;
} }
int _close(int file);
int _close(int file) {
(void)file;
return -1;
}
int _fstat(int file, struct stat *st);
int _fstat(int file, struct stat *st) {
(void)file;
st->st_mode = S_IFCHR;
return 0;
}
int _isatty(int file);
int _isatty(int file) {
(void)file;
return 1;
}
int _lseek(int file, int ptr, int dir);
int _lseek(int file, int ptr, int dir) {
(void)file;
(void)ptr;
(void)dir;
return 0;
}
// Optional — stubbed read (e.g. for scanf), returns 0 bytes
int _read(int file, char *ptr, int len);
int _read(int file, char *ptr, int len) {
(void)file;
(void)ptr;
(void)len;
return 0;
}