Thomas Olson
Simplistic code to test a couple WS2803 in series. WS2803 are 18 channel PWM constant current sources (sinks) normally used to drive 18 LEDs or 6 RGB LEDs.
Revision 0:0bf629429936, committed 2013-02-14
- Comitter:
- tolson
- Date:
- Thu Feb 14 04:59:29 2013 +0000
- Commit message:
- Simplistic code to test WS2803 18 channel PWM constant current source
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 Thu Feb 14 04:59:29 2013 +0000
@@ -0,0 +1,79 @@
+// WS2803_Testing_MBED
+// By Thomas Olson
+// teo20130210.01
+// MBED LPC1768
+// WS2803 pin4 CKI -> ws2803_clockPin(p21)
+// WS2803 pin5 SDI -> ws2803_dataPin(p22)
+
+
+#include "mbed.h"
+
+DigitalOut ws2803_clockPin(p21);
+DigitalOut ws2803_dataPin(p22);
+
+#define nLEDs 18
+#define nBARs 2 // Number of WS2803 chained together
+
+uint8_t ledBar[nBARs][nLEDs];
+
+void shiftOut(uint8_t sodata) {
+ for(int i = 7; i >= 0; i--) {
+ ws2803_clockPin = 0;
+ if(sodata & (0x01 << i)){
+ ws2803_dataPin = 1;
+ } else {
+ ws2803_dataPin = 0;
+ }
+ wait_us(1);
+ ws2803_clockPin = 1;
+ wait_us(1);
+ ws2803_clockPin = 0;
+ }
+}
+
+void loadWS2803(){
+ for(int wsBar = 0; wsBar < nBARs; wsBar++){
+ for (int wsOut = 0; wsOut < nLEDs; wsOut++){
+ shiftOut(ledBar[nBARs-(wsBar+1)][wsOut]);
+ }
+ }
+ ws2803_clockPin = 0;
+ wait_us(600); // 500us-600us needed to reset WS2803s
+}
+
+void clearWS2803(){
+ for(int wsOut = 0; wsOut < nLEDs; wsOut++){
+ ledBar[0][wsOut] = ledBar[1][wsOut] = 0x00;
+ loadWS2803();
+ }
+}
+
+int main() {
+ // initialize WS2803s
+ ws2803_clockPin = 0;
+ wait_us(600);
+
+ while(1) {
+ clearWS2803();
+ wait(2.0);
+ // Chase mode
+ for(int iOut=7; iOut < 256; iOut*=2){
+ for(int wsOut = 0; wsOut < nLEDs; wsOut++){
+ ledBar[0][wsOut] = ledBar[1][wsOut] = (uint8_t)(0xFF & iOut);
+ loadWS2803();
+ clearWS2803();
+ }
+ }
+
+ wait(2.0);
+ //parallel mode
+ for(int iOut = 7; iOut < 64; iOut*=4){
+ for(int wsOut = 0; wsOut < nLEDs; wsOut++){
+ ledBar[0][wsOut] = ledBar[1][wsOut] = (uint8_t)(0xFF & iOut);
+ loadWS2803();
+ wait_us(1000000);
+ }
+ wait_us(10000);
+ }
+ }// while(1)
+}
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/mbed.bld Thu Feb 14 04:59:29 2013 +0000 @@ -0,0 +1,1 @@ +http://mbed.org/users/mbed_official/code/mbed/builds/0954ebd79f59 \ No newline at end of file