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-rw-r--r--serial.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/serial.c b/serial.c
index 126079a..f7d8e5e 100644
--- a/serial.c
+++ b/serial.c
@@ -335,7 +335,7 @@ int serialport_shutdown(void *data)
return 0;
}
-int serialport_write(unsigned char *buf, unsigned int writecnt)
+int serialport_write(const unsigned char *buf, unsigned int writecnt)
{
#ifdef _WIN32
DWORD tmp = 0;
@@ -470,7 +470,7 @@ int serialport_read_nonblock(unsigned char *c, unsigned int readcnt, unsigned in
/* Tries up to timeout ms to write writecnt characters from the array starting at buf. Returns
* 0 on success, positive values on temporary errors (e.g. timeouts) and negative ones on permanent errors.
* If really_wrote is not NULL, this function sets its contents to the number of bytes written successfully. */
-int serialport_write_nonblock(unsigned char *buf, unsigned int writecnt, unsigned int timeout, unsigned int *really_wrote)
+int serialport_write_nonblock(const unsigned char *buf, unsigned int writecnt, unsigned int timeout, unsigned int *really_wrote)
{
int ret = 1;
/* disable blocked i/o and declare platform-specific variables */
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