Diff: can.c

Revision:

0:9edfcca7cd25

Child:

1:6877bb99aa17

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/can.c	Tue Jan 12 16:49:56 2010 +0000
@@ -0,0 +1,56 @@
+#include "mbed.h"
+#include "diags.h"
+#include "CAN.h"
+
+Ticker ticker;
+
+// CAN_RS pin at Philips PCA82C250 can bus controller.
+// activate transceiver by pulling this pin to GND.
+// (Rise and fall slope controlled by resistor R_s)
+// (+5V result in tranceiver standby mode)
+// For further information see datasheet page 4
+DigitalOut can_Pca82c250SlopePin(p28);
+
+// We use can on mbed pins 29(CAN_TXD) and 30(CAN_RXD).
+CAN can(p30, p29);
+
+int    can_cnt=0;
+
+/******************************************/
+/*                                        */
+/*    Can Bus Tests                       */
+/*                                        */
+/*                                        */
+/*                                        */
+/*                                        */
+/******************************************/
+void send() {
+    static char counter = 0;
+    if (can.write(CANMessage(0x200, &counter, 1))) {
+        printf("CanTx--> id: 0x200  dlc: 1  data: %x\n\r", counter);
+        counter++;
+    } else {
+        printf("CanTx--> id: 0x200  dlc: 1  data: %x ERROR\n\r", counter);
+        can.reset();
+    }
+    if(can_cnt==0){
+        led_on(3);
+        can_cnt=1;
+    } else {
+        led_off(3);
+        can_cnt=0;
+    }
+    // toggle led1 after every transmission
+}
+void test_can(int loop)
+{
+    // 500kbit/s
+    can.frequency(500000);
+    // activate external can transceiver
+    can_Pca82c250SlopePin = 0;
+    can_cnt=loop;
+    // every 500ms
+    ticker.attach(&send, 0.5);
+    
+    printf("CAN message ticker started\n\r");
+}
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