Garrett Gudgel / Mbed 2 deprecated SPI_CAN_MASTER

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.

Dependencies:   mbed

Files at this revision

API Documentation at this revision

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

main.cpp Show annotated file Show diff for this revision Revisions of this file
mbed.bld Show annotated file Show diff for this revision Revisions of this file
spiMasterProtocol.cpp Show annotated file Show diff for this revision Revisions of this file
spiMasterProtocol.h Show annotated file Show diff for this revision Revisions of this file 
diff -r 000000000000 -r 855b6e84e744 main.cpp
--- /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

diff -r 000000000000 -r 855b6e84e744 mbed.bld
--- /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

diff -r 000000000000 -r 855b6e84e744 spiMasterProtocol.cpp
--- /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

diff -r 000000000000 -r 855b6e84e744 spiMasterProtocol.h
--- /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