Fix PN532 UART support + macOS support

README.md

@@ -214,7 +214,7 @@ Readers known to work:
 
 These readers are support by CCID since v1.4.25, make sure your CCID driver version higher or equal to 1.4.25.
 
-On MacOS, you can check your CCID version with the following command, and if required, you can install latest CCID driver from [https://github.com/martinpaljak/osx-ccid-installer/releases](https://github.com/martinpaljak/osx-ccid-installer/releases)
+On macOS, you can check your CCID version with the following command, and if required, you can install latest CCID driver from [https://github.com/martinpaljak/osx-ccid-installer/releases](https://github.com/martinpaljak/osx-ccid-installer/releases)
 
 ```
 grep -A 1 CFBundleShortVersionString /usr/local/libexec/SmartCardServices/drivers/ifd-ccid.bundle/Contents/Info.plist

contrib/win32/libnfc/buses/uart.c

@@ -237,7 +237,7 @@ uart_send(serial_port sp, const uint8_t *pbtTx, const size_t szTx, int timeout)
   }
   if (!dwTxLen)
     return NFC_EIO;
-  return 0;
+  return NFC_SUCCESS;
 }
 
 BOOL is_port_available(int nPort)

libnfc/buses/i2c.c

@@ -47,7 +47,11 @@
 #include <fcntl.h>
 #include <limits.h>
 #include <stdio.h>
+#ifdef __APPLE__
+#include <sys/termios.h>
+#else
 #include <termios.h>
+#endif
 #include <unistd.h>
 #include <stdlib.h>
 #include <time.h>

libnfc/buses/spi.c

@@ -49,7 +49,11 @@
 #include <fcntl.h>
 #include <limits.h>
 #include <stdio.h>
+#ifdef __APPLE__
+#include <sys/termios.h>
+#else
 #include <termios.h>
+#endif
 #include <unistd.h>
 
 #include <nfc/nfc.h>

libnfc/buses/uart.c

@@ -47,7 +47,11 @@
 #include <fcntl.h>
 #include <limits.h>
 #include <stdio.h>
+#ifdef __APPLE__
+#include <sys/termios.h>
+#else
 #include <termios.h>
+#endif
 #include <unistd.h>
 #include <stdlib.h>
 
@@ -95,6 +99,19 @@ const char *serial_ports_device_radix[] = { "ttyUSB", "ttyS", "ttyACM", "ttyAMA"
 // Work-around to claim uart interface using the c_iflag (software input processing) from the termios struct
 #  define CCLAIMED 0x80000000
 
+// If macOS and still haven't detected required baud rates, set them as we do have support for some
+#ifdef __APPLE__
+#ifndef  B57600
+#define  B57600  57600
+#endif
+#ifndef B115200
+#define B115200 115200
+#endif
+#ifndef B230400
+#define B230400 230400
+#endif
+#endif
+
 struct serial_port_unix {
   int 			fd; 			// Serial port file descriptor
   struct termios 	termios_backup; 	// Terminal info before using the port
@@ -377,10 +394,39 @@ uart_send(serial_port sp, const uint8_t *pbtTx, const size_t szTx, int timeout)
 {
   (void) timeout;
   LOG_HEX(LOG_GROUP, "TX", pbtTx, szTx);
+
+#ifndef __APPLE__
   if ((int) szTx == write(UART_DATA(sp)->fd, pbtTx, szTx))
     return NFC_SUCCESS;
   else
     return NFC_EIO;
+#else
+  // macOS's termios write() to a uart is async so we need to determine how to make it sync
+  // see https://github.com/nfc-tools/libnfc/pull/633
+  // there is probably a proper way to do this, if so, please share!
+  return uart_send_single(sp, pbtTx, szTx, timeout);
+#endif
+}
+
+/**
+ * @brief Send \a pbtTx content to UART one byte at a time with a delay (to support macOS' async write)
+ *
+ * @return 0 on success, otherwise a driver error is returned
+ */
+int
+uart_send_single(serial_port sp, const uint8_t *pbtTx, const size_t szTx, int timeout)
+{
+  (void) timeout;
+
+  for (int i = 0; i < szTx; i++)
+  {
+    if (write(UART_DATA(sp)->fd, pbtTx+i, 1) != 1)
+      return NFC_EIO;
+
+    usleep(9); // sleep for ceil(1_000_000us / 115200baud) = 9us
+  }
+
+  return NFC_SUCCESS;
 }
 
 char **

libnfc/buses/uart.h

@@ -58,6 +58,7 @@ uint32_t uart_get_speed(const serial_port sp);
 
 int     uart_receive(serial_port sp, uint8_t *pbtRx, const size_t szRx, void *abort_p, int timeout);
 int     uart_send(serial_port sp, const uint8_t *pbtTx, const size_t szTx, int timeout);
+int     uart_send_single(serial_port sp, const uint8_t *pbtTx, const size_t szTx, int timeout);
 
 char  **uart_list_ports(void);