Peter Allnutt
Simple SPI test Application, intended to be used with SSS to send data between 2 mbed devices
Revision 0:ec8b56c64406, committed 2011-08-26
- Comitter:
- picnic
- Date:
- Fri Aug 26 10:10:11 2011 +0000
- Commit message:
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 |
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp Fri Aug 26 10:10:11 2011 +0000
@@ -0,0 +1,68 @@
+#include "mbed.h"
+
+// Simple SPI Master
+// Simply sends incrementing bytes and receives the echo from the previous one
+
+SPI spi(p5, p6, p7); // mosi, miso, sclk
+DigitalOut cs(p8);
+
+Serial pc(USBTX, USBRX); // tx, rx
+
+#define SINGLE 0
+#define CONTINUOUS 1
+
+ long c = 0;
+ unsigned char r = 0;
+ unsigned char v = 0;
+ int ch;
+
+void sendbyte() {
+ // Select the device by seting chip select low
+ cs = 0;
+ v = c & 0xff;
+ r = spi.write( v );
+ // Deselect the device
+ cs = 1;
+
+ pc.printf("%ld v=%02x\r\n", c, v);
+ if (( c>0 ) && ( r!=(unsigned char)(v-1)) ) {
+ pc.printf( " Echo error %02x!=%02x\r\n", v-1, r );
+ pc.printf("Press any key to continue\r\n");
+ ch = pc.getc();
+ }
+ c++;
+}
+
+int main() {
+ int mode = 0;
+
+ pc.printf("Simple SPI Master Test\r\n");
+ pc.printf("Uses MBED's SPI library (1 byte in - 1 byte out)\r\n");
+ pc.printf("\r\n C : Toggle continuous mode\r\n" );
+ pc.printf(" T : Make a single transmission\r\n" );
+
+ // Setup the spi
+ // second edge capture, with a 1MHz clock rate
+ spi.format(8,3);
+ spi.frequency(100000);
+
+ while (1) {
+ if ( mode ) {
+ wait_ms( 1 );
+ sendbyte();
+ }
+ if ( pc.readable() ) {
+ ch = pc.getc();
+ switch ( ch ) {
+ case 'C':
+ case 'c':
+ mode = ! mode;
+ break;
+ case 'T':
+ case 't':
+ sendbyte();
+ break;
+ }
+ }
+ }
+}
\ No newline at end of file
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/mbed.bld Fri Aug 26 10:10:11 2011 +0000 @@ -0,0 +1,1 @@ +http://mbed.org/users/mbed_official/code/mbed/builds/63bcd7ba4912