--- /dev/null
+/*
+ * "Copyright (c) 2006 Washington University in St. Louis.
+ * All rights reserved.
+ *
+ * Permission to use, copy, modify, and distribute this software and its
+ * documentation for any purpose, without fee, and without written agreement is
+ * hereby granted, provided that the above copyright notice, the following
+ * two paragraphs and the author appear in all copies of this software.
+ *
+ * IN NO EVENT SHALL WASHINGTON UNIVERSITY IN ST. LOUIS BE LIABLE TO ANY PARTY
+ * FOR DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING
+ * OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF WASHINGTON
+ * UNIVERSITY IN ST. LOUIS HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * WASHINGTON UNIVERSITY IN ST. LOUIS SPECIFICALLY DISCLAIMS ANY WARRANTIES,
+ * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
+ * AND FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
+ * ON AN "AS IS" BASIS, AND WASHINGTON UNIVERSITY IN ST. LOUIS HAS NO
+ * OBLIGATION TO PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR
+ * MODIFICATIONS."
+ */
+
+/**
+ * This is the PrintfP component. It provides the printf service for printing
+ * data over the serial interface using the standard c-style printf command.
+ * It must be started via the SplitControl interface it provides. Data
+ * printed using printf are buffered and only sent over the serial line after
+ * making a call to PrintfFlush.flush(). This buffer has a maximum size of
+ * 250 bytes at present. After calling start on this component, printf
+ * statements can be made anywhere throughout your code, so long as you include
+ * the "printf.h" header file in every file you wish to use it. Standard
+ * practice is to start the printf service in the main application, and set up
+ * a timer to periodically flush the printf buffer (500ms should do). In future
+ * versions, user defined buffer sizes as well as well as automatic flushing at
+ * user defined intervals will be supported.
+ *
+ * The printf service is currently only available for msp430 based motes
+ * (i.e. telos, eyes) and atmega128 based motes (i.e. mica2, micaz). On the
+ * atmega platforms, avr-libc version 1.4 or above mus tbe used.
+ *
+ *
+ * @author Kevin Klues (klueska@cs.wustl.edu)
+ * @version $Revision$
+ * @date $Date$
+ */
+
+#include "printf.h"
+
+#ifdef _H_atmega128hardware_H
+static int uart_putchar(char c, FILE *stream);
+static FILE atm128_stdout = FDEV_SETUP_STREAM(uart_putchar, NULL, _FDEV_SETUP_WRITE);
+#endif
+
+module PrintfP {
+ provides {
+ interface SplitControl as PrintfControl;
+ interface PrintfFlush;
+ }
+ uses {
+ interface SplitControl as SerialControl;
+ interface AMSend;
+ interface Packet;
+ }
+}
+implementation {
+
+ enum {
+ S_STARTED,
+ S_STOPPED,
+ S_FLUSHING,
+ };
+
+ message_t printfMsg;
+ nx_uint8_t buffer[PRINTF_BUFFER_SIZE];
+ norace nx_uint8_t* next_byte;
+ uint8_t state = S_STOPPED;
+ uint32_t bytes_left_to_flush;
+ uint8_t length_to_send;
+
+ task void retrySend() {
+ if(call AMSend.send(AM_BROADCAST_ADDR, &printfMsg, sizeof(printf_msg_t)) != SUCCESS)
+ post retrySend();
+ }
+
+ void sendNext() {
+ printf_msg_t* m = (printf_msg_t*)call Packet.getPayload(&printfMsg, sizeof(printf_msg_t));
+ length_to_send = (bytes_left_to_flush < sizeof(printf_msg_t)) ? bytes_left_to_flush : sizeof(printf_msg_t);
+ memset(m->buffer, 0, sizeof(printf_msg_t));
+ memcpy(m->buffer, (nx_uint8_t*)next_byte, length_to_send);
+ if(call AMSend.send(AM_BROADCAST_ADDR, &printfMsg, sizeof(printf_msg_t)) != SUCCESS)
+ post retrySend();
+ else {
+ bytes_left_to_flush -= length_to_send;
+ next_byte += length_to_send;
+ }
+ }
+
+ command error_t PrintfControl.start() {
+ if(state == S_STOPPED)
+ return call SerialControl.start();
+ return FAIL;
+ }
+
+ command error_t PrintfControl.stop() {
+ if(state == S_STARTED)
+ return call SerialControl.stop();
+ return FAIL;
+ }
+
+ event void SerialControl.startDone(error_t error) {
+ if(error != SUCCESS) {
+ signal PrintfControl.startDone(error);
+ return;
+ }
+#ifdef _H_atmega128hardware_H
+ stdout = &atm128_stdout;
+#endif
+ atomic {
+ memset(buffer, 0, sizeof(buffer));
+ next_byte = buffer;
+ bytes_left_to_flush = 0;
+ length_to_send = 0;
+ state = S_STARTED;
+ }
+ signal PrintfControl.startDone(error);
+ }
+
+ event void SerialControl.stopDone(error_t error) {
+ if(error != SUCCESS) {
+ signal PrintfControl.stopDone(error);
+ return;
+ }
+ atomic state = S_STOPPED;
+ signal PrintfControl.stopDone(error);
+ }
+
+ command error_t PrintfFlush.flush() {
+ atomic {
+ if(state == S_STARTED && (next_byte > buffer)) {
+ state = S_FLUSHING;
+ bytes_left_to_flush = next_byte - buffer;
+ next_byte = buffer;
+ }
+ else return FAIL;
+ }
+ sendNext();
+ return SUCCESS;
+ }
+
+ event void AMSend.sendDone(message_t* msg, error_t error) {
+ if(error == SUCCESS) {
+ if(bytes_left_to_flush > 0)
+ sendNext();
+ else {
+ next_byte = buffer;
+ bytes_left_to_flush = 0;
+ length_to_send = 0;
+ atomic state = S_STARTED;
+ signal PrintfFlush.flushDone(error);
+ }
+ }
+ else post retrySend();
+ }
+
+#ifdef _H_msp430hardware_h
+ int putchar(int c) __attribute__((noinline)) @C() @spontaneous() {
+#endif
+#ifdef _H_atmega128hardware_H
+ int uart_putchar(char c, FILE *stream) __attribute__((noinline)) @C() @spontaneous() {
+#endif
+ atomic {
+ if(state == S_STARTED && ((next_byte-buffer) < PRINTF_BUFFER_SIZE)) {
+ *(next_byte++) = c;
+ return 0;
+ }
+ else return -1;
+ }
+ }
+}
projects / tinyos-2.x.git / blobdiff