Garrett Gudgel
Each LPC1768 is capable of controlling 2 CAN bus lines. Linking multiple chips together via SPI allows for more bus lines to be monitored simultaneously. Slave unit.
Revision 0:a46303f3277c, committed 2014-10-31
- Comitter:
- ggudgel
- Date:
- Fri Oct 31 22:14:03 2014 +0000
- Commit message:
- First working revision. Test functionality of one mbed system controlling another through SPI, while utilizing CAN bus lines.
Changed in this revision
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/CAN_thread.cpp Fri Oct 31 22:14:03 2014 +0000
@@ -0,0 +1,31 @@
+#include "mbed.h"
+#include "rtos.h"
+#include "CAN_thread.h"
+
+DigitalOut led1(LED1);
+DigitalOut led2(LED2);
+CAN can1(p9, p10);
+CAN can2(p30, p29);
+char counter1 = 0;
+
+void sendBUS1(void const *args) {
+ if(can1.write(CANMessage(1337, &counter1, 1))) {
+ counter1++;
+ }
+ led1 = !led1;
+}
+
+void CAN_thread (void const *args) {
+ can1.frequency(125000);
+ can2.frequency(125000);
+
+ RtosTimer CAN1send(sendBUS1, osTimerPeriodic);
+ CAN1send.start(1000);
+ CANMessage msg;
+ while(1) {
+ if(can2.read(msg)) {
+ led2 = !led2;
+ }
+ Thread::wait(10);
+ }
+}
\ No newline at end of file
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/CAN_thread.h Fri Oct 31 22:14:03 2014 +0000 @@ -0,0 +1,3 @@ +#include "mbed.h" + +void CAN_thread (void const *args); \ No newline at end of file
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp Fri Oct 31 22:14:03 2014 +0000
@@ -0,0 +1,16 @@
+#include "mbed.h"
+#include "rtos.h"
+#include "spiSlaveProtocol.h"
+#include "CAN_thread.h"
+
+int main() {
+ Thread thread(CAN_thread);
+
+
+ Serial* pc = new Serial(USBTX, USBRX); // tx, rx
+
+ spiSlaveProtocol* device = new spiSlaveProtocol(pc);
+ while (1) {
+ device->run();
+ }
+}
\ No newline at end of file
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/mbed-rtos.lib Fri Oct 31 22:14:03 2014 +0000 @@ -0,0 +1,1 @@ +http://developer.mbed.org/users/mbed_official/code/mbed-rtos/#a3452b867ec3
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/mbed.bld Fri Oct 31 22:14:03 2014 +0000 @@ -0,0 +1,1 @@ +http://mbed.org/users/mbed_official/code/mbed/builds/031413cf7a89 \ No newline at end of file
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/spiSlaveProtocol.cpp Fri Oct 31 22:14:03 2014 +0000
@@ -0,0 +1,32 @@
+#include "spiSlaveProtocol.h"
+
+spiSlaveProtocol::spiSlaveProtocol(Serial* PC) {
+ spiLine = new SPISlave(p5, p6, p7, p8);
+ spiLine->format(8,3); // Setup: bit data, high steady state clock, 2nd edge capture
+ spiLine->frequency(1000000); // 1MHz
+
+ pc = PC; // tx, rx
+ pc->printf("======================================================\r\n");
+
+ timout = new Timer();
+
+ state = 0;
+ commandBytes = 0;
+}
+
+ void spiSlaveProtocol::run() {
+ if (spiLine->receive()) {
+ int valueFromMaster = spiLine->read();
+
+ if (valueFromMaster == 0x42) {
+ spiLine->reply(0xAA); // Prime SPI with next reply
+ //pc->printf("Life rxvd, next line will reply with 0xAA\n\r");
+ }
+
+ else if (valueFromMaster == 0x84) {
+ spiLine->reply(0xAB);
+ spiLine->reply(0xAC);
+ //pc->printf("Life multiplyer, next line will reply with 2 x 0xBB\n\r");
+ }
+ }
+}
\ No newline at end of file
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/spiSlaveProtocol.h Fri Oct 31 22:14:03 2014 +0000
@@ -0,0 +1,19 @@
+#ifndef _spiSlave_included_
+#define _spiSlave_included_
+#include "mbed.h"
+
+class spiSlaveProtocol
+{
+ public:
+ spiSlaveProtocol(Serial*);
+ void run(void);
+
+ private:
+ SPISlave* spiLine;
+ int state;
+ int commandBytes;
+ Serial* pc;
+ Timer* timout;
+
+};
+#endif
\ No newline at end of file