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. Master unit.
Revision 0:855b6e84e744, committed 2014-10-31
- Comitter:
- ggudgel
- Date:
- Fri Oct 31 22:13:47 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/main.cpp Fri Oct 31 22:13:47 2014 +0000
@@ -0,0 +1,26 @@
+#include "mbed.h"
+#include "spiMasterProtocol.h"
+
+// https://developer.mbed.org/forum/helloworld/topic/2541/
+
+Serial pc(USBTX, USBRX); // tx, rx
+
+int main() {
+ spiMasterProtocol* canDevice = new spiMasterProtocol();
+
+ pc.printf("======================================================\r\n");
+ pc.printf("Press any key to start...\r\n");
+ pc.getc(); // wait for keyboard
+
+ while (1) {
+
+ canDevice->get42();
+
+ wait(0.5); // Wait for 5 seconds for readability only
+
+ canDevice->get84();
+
+ wait(0.5);
+
+ }
+}
\ No newline at end of file
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/mbed.bld Fri Oct 31 22:13:47 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/spiMasterProtocol.cpp Fri Oct 31 22:13:47 2014 +0000
@@ -0,0 +1,52 @@
+#include "spiMasterProtocol.h"
+
+spiMasterProtocol::spiMasterProtocol() {
+ spiLine = new SPI(p5, p6, p7);
+ spiLine->format(8,3); // Setup: bit data, high steady state clock, 2nd edge capture
+ spiLine->frequency(1000000); // 1MHz
+
+ chipSelect = new DigitalOut(p8);
+ chipSelect->write(1);
+}
+
+ int spiMasterProtocol::get42() {
+ int temp = write(0x42);
+ wait_us(5);
+ int data = write(0x00);
+ wait_us(5);
+ int dataExtra = write(0x00);
+
+ printf("get42():\n\r");
+ printf("temp = %d\n\r", temp);
+ printf("data = %d\n\r", data);
+ printf("dataExtra = %d\n\r", data);
+ printf("\n");
+
+ return data;
+}
+
+ int spiMasterProtocol::get84() {
+ int temp = write(0x84);
+ wait_us(5);
+ int data1 = write(0x00);
+ wait_us(5);
+ int data2 = write(0x00);
+
+ printf("get84():\n\r");
+ printf("temp = %d\n\r", temp);
+ printf("data1 = %d\n\r", data1);
+ printf("data2 = %d\n\r", data2);
+ printf("\n");
+
+ return data2;
+}
+
+int spiMasterProtocol::write(int m) {
+ chipSelect->write(0);
+
+ int returnMess = spiLine->write(m);
+
+ chipSelect->write(1);
+
+ return returnMess;
+}
\ No newline at end of file
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/spiMasterProtocol.h Fri Oct 31 22:13:47 2014 +0000
@@ -0,0 +1,19 @@
+#ifndef _spiMaster_included_
+#define _spiMaster_included_
+#include "mbed.h"
+
+class spiMasterProtocol
+{
+ public:
+ spiMasterProtocol();
+ int get42(void);
+ int get84(void);
+
+ private:
+ SPI* spiLine;
+ DigitalOut* chipSelect;
+
+ int write(int);
+
+};
+#endif
\ No newline at end of file