uart: bunch of small changes to make C api work

Signed-off-by: Brendan Le Foll <brendan.le.foll@intel.com>

api/mraa/uart.h

@@ -76,18 +76,6 @@ mraa_result_t mraa_uart_set_timeout(mraa_uart_context dev, int read, int write,
  */
 char* mraa_uart_get_dev_path(mraa_uart_context dev);
 
-/**
- * Open the TTY device associated with a UART context, and set up the
- * terminal modes and baud rate.  The TTY is setup for a 'raw'
- * mode. 81N, no echo or special character handling, such as flow
- * control or line editing semantics.
- *
- * @param dev uart context
- * @param baud desired baud rate
- * @return mraa_result_t
- */
-mraa_result_t mraa_uart_open_dev(mraa_uart_context dev, unsigned int baud);
-
 /**
  * Destroy a mraa_uart_context
  *

api/mraa/uart.hpp

@@ -58,8 +58,7 @@ class Uart
      */
     ~Uart()
     {
-        stopDevice();
+        mraa_uart_stop(m_uart);
-        return;
     }
 
     /**
@@ -75,57 +74,30 @@ class Uart
         return ret_val;
     }
 
-    /**
-     * Open the TTY device associated with a UART context, and set up the
-     * terminal modes and baud rate.  The TTY is setup for a 'raw'
-     * mode.  81N, no echo or special character handling, such as flow
-     * control or line editing semantics.
-     *
-     * @param baud desired baud rate
-     * @return mraa_result_t
-     */
-    mraa_result_t
-    openDevice(unsigned int baud)
-    {
-        return mraa_uart_open_dev(m_uart, baud);
-    }
-
-    /**
-     * Close a device previously opened with mraa_uart_open_dev().
-     *
-     * @param dev uart context
-     * @return mraa_result_t
-     */
-    mraa_result_t
-    stopDevice()
-    {
-        return mraa_uart_stop(m_uart);
-    }
-
     /**
      * Read bytes from the device into a buffer
      *
-     * @param buf buffer pointer
+     * @param data buffer pointer
-     * @param len maximum size of buffer
+     * @param length maximum size of buffer
      * @return the number of bytes read, or -1 if an error occurred
      */
     int
-    read(char* buf, size_t len)
+    read(char* data, int length)
     {
-        return mraa_uart_read(m_uart, buf, len);
+        return mraa_uart_read(m_uart, data, length);
     }
 
     /**
      * Write bytes in buffer to a device
      *
-     * @param buf buffer pointer
+     * @param data buffer pointer
-     * @param len maximum size of buffer
+     * @param length maximum size of buffer
      * @return the number of bytes written, or -1 if an error occurred
      */
     int
-    write(char* buf, size_t len)
+    write(char* data, int length)
     {
-        return mraa_uart_write(m_uart, buf, len);
+        return mraa_uart_write(m_uart, data, length);
     }
 
     /**

src/uart/uart.c

@@ -198,8 +198,9 @@ mraa_uart_init_raw(int index)
     struct termios termio;
 
     // get current modes
-    if (!tcgetattr(dev->fd, &termio)) {
+    if (tcgetattr(dev->fd, &termio)) {
         syslog(LOG_ERR, "uart: tcgetattr() failed");
+        close(dev->fd);
         free(dev);
         return NULL;
     }
@@ -209,7 +210,8 @@ mraa_uart_init_raw(int index)
     // cfmakeraw is not POSIX!
     cfmakeraw(&termio);
 
-    if (!mraa_uart_set_baudrate(dev, 9600)) {
+    if (mraa_uart_set_baudrate(dev, 9600) != MRAA_SUCCESS) {
+        close(dev->fd);
         free(dev);
         return NULL;
     }
@@ -259,7 +261,7 @@ mraa_uart_set_baudrate(mraa_uart_context dev, unsigned int baud)
     }
 
     struct termios termio;
-    if (!tcgetattr(dev->fd, &termio)) {
+    if (tcgetattr(dev->fd, &termio)) {
         syslog(LOG_ERR, "uart: tcgetattr() failed");
         return MRAA_ERROR_INVALID_HANDLE;
     }