Diff: main.cpp

Revision:

0:4ae09285aac1

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+++ b/main.cpp	Mon May 29 14:09:29 2017 +0000
@@ -0,0 +1,115 @@
+/***************************************************************************//**
+ * @file main.cpp
+ * @brief Demo program for the mbed asynchronous serial API.
+ *******************************************************************************
+ * @section License
+ * <b>(C) Copyright 2015 Silicon Labs, http://www.silabs.com</b>
+ *******************************************************************************
+ *
+ * Permission is granted to anyone to use this software for any purpose,
+ * including commercial applications, and to alter it and redistribute it
+ * freely, subject to the following restrictions:
+ *
+ * 1. The origin of this software must not be misrepresented; you must not
+ *    claim that you wrote the original software.
+ * 2. Altered source versions must be plainly marked as such, and must not be
+ *    misrepresented as being the original software.
+ * 3. This notice may not be removed or altered from any source distribution.
+ *
+ * DISCLAIMER OF WARRANTY/LIMITATION OF REMEDIES: Silicon Labs has no
+ * obligation to support this Software. Silicon Labs is providing the
+ * Software "AS IS", with no express or implied warranties of any kind,
+ * including, but not limited to, any implied warranties of merchantability
+ * or fitness for any particular purpose or warranties against infringement
+ * of any proprietary rights of a third party.
+ *
+ * Silicon Labs will not be liable for any consequential, incidental, or
+ * special damages, or any other relief, or for any claim by any third party,
+ * arising from your use of this Software.
+ *
+ ******************************************************************************/
+ 
+#include "mbed.h"
+
+/*------------ Constant definitions --------------*/
+#define TX_PIN          USBTX
+#define RX_PIN          USBRX
+#define BRATE           115200
+#define LED_PIN         LED0
+#define TOGGLE_RATE     (0.5f)
+#define BUFF_LENGTH     5
+
+/*-------- Check if platform compatible ----------*/
+#if DEVICE_SERIAL_ASYNCH
+Serial test_connection(USBTX, USBRX);
+#else
+#error "Platform not compatible with Low Power APIs for Serial"
+#endif
+
+/*------------------ Variables -------------------*/
+LowPowerTicker      blinker;
+bool                blinking = false;
+event_callback_t    serialEventCb;
+DigitalOut          LED(LED_PIN);
+uint8_t             rx_buf[BUFF_LENGTH + 1];
+
+/*------------------ Callbacks -------------------*/
+void blink(void) {
+    LED = !LED;
+}
+
+/**
+* This is a callback! Do not call frequency-dependent operations here.
+*
+* For a more thorough explanation, go here: 
+* https://developer.mbed.org/teams/SiliconLabs/wiki/Using-the-improved-mbed-sleep-API#mixing-sleep-with-synchronous-code
+**/
+void serialCb(int events) {
+    /* Something triggered the callback, either buffer is full or 'S' is received */
+    unsigned char i;
+    if(events & SERIAL_EVENT_RX_CHARACTER_MATCH) {
+        //Received 'S', check for buffer length
+        for(i = 0; i < BUFF_LENGTH; i++) {
+            //Found the length!
+            if(rx_buf[i] == 'S') break;
+        }
+        
+        // Toggle blinking
+        if(blinking) {
+            blinker.detach();
+            blinking = false;
+        } else {
+            blinker.attach(blink, TOGGLE_RATE);
+            blinking = true;
+        }
+    } else if (events & SERIAL_EVENT_RX_COMPLETE) {
+        i = BUFF_LENGTH - 1;
+    } else {
+        rx_buf[0] = 'E';
+        rx_buf[1] = 'R';
+        rx_buf[2] = 'R';
+        rx_buf[3] = '!';
+        rx_buf[4] = 0;
+        i = 3;
+    }
+    
+    // Echo string, no callback
+    test_connection.write(rx_buf, i+1, 0, 0);
+    
+    // Reset serial reception
+    test_connection.read(rx_buf, BUFF_LENGTH, serialEventCb, SERIAL_EVENT_RX_ALL, 'S');
+}
+
+/*-------------------- Main ----------------------*/
+int main() {
+    /* Very Simple Main (tm) */
+    serialEventCb.attach(serialCb);
+    
+    /* Setup serial connection */
+    test_connection.baud(BRATE);
+    test_connection.printf("Low Power API test\n\nSend 'S' to toggle blinking\n");
+    test_connection.read(rx_buf, BUFF_LENGTH, serialEventCb, SERIAL_EVENT_RX_ALL, 'S');
+    
+    /* Let the callbacks take care of everything */
+    while(1) sleep();
+}
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