Thomas Olson / Mbed 2 deprecated ws2803_test

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.

Dependencies:   mbed

main.cpp@0:0bf629429936, 2013-02-14 (annotated)

Committer:
tolson
Date:
Thu Feb 14 04:59:29 2013 +0000
Revision:
0:0bf629429936
Simplistic code to test WS2803 18 channel PWM constant current source

Who changed what in which revision?

UserRevisionLine numberNew contents of line
tolson 0:0bf629429936 1 // WS2803_Testing_MBED
tolson 0:0bf629429936 2 // By Thomas Olson
tolson 0:0bf629429936 3 // teo20130210.01
tolson 0:0bf629429936 4 // MBED LPC1768
tolson 0:0bf629429936 5 // WS2803 pin4 CKI -> ws2803_clockPin(p21)
tolson 0:0bf629429936 6 // WS2803 pin5 SDI -> ws2803_dataPin(p22)
tolson 0:0bf629429936 7
tolson 0:0bf629429936 8
tolson 0:0bf629429936 9 #include "mbed.h"
tolson 0:0bf629429936 10
tolson 0:0bf629429936 11 DigitalOut ws2803_clockPin(p21);
tolson 0:0bf629429936 12 DigitalOut ws2803_dataPin(p22);
tolson 0:0bf629429936 13
tolson 0:0bf629429936 14 #define nLEDs 18
tolson 0:0bf629429936 15 #define nBARs 2 // Number of WS2803 chained together
tolson 0:0bf629429936 16
tolson 0:0bf629429936 17 uint8_t ledBar[nBARs][nLEDs];
tolson 0:0bf629429936 18
tolson 0:0bf629429936 19 void shiftOut(uint8_t sodata) {
tolson 0:0bf629429936 20 for(int i = 7; i >= 0; i--) {
tolson 0:0bf629429936 21 ws2803_clockPin = 0;
tolson 0:0bf629429936 22 if(sodata & (0x01 << i)){
tolson 0:0bf629429936 23 ws2803_dataPin = 1;
tolson 0:0bf629429936 24 } else {
tolson 0:0bf629429936 25 ws2803_dataPin = 0;
tolson 0:0bf629429936 26 }
tolson 0:0bf629429936 27 wait_us(1);
tolson 0:0bf629429936 28 ws2803_clockPin = 1;
tolson 0:0bf629429936 29 wait_us(1);
tolson 0:0bf629429936 30 ws2803_clockPin = 0;
tolson 0:0bf629429936 31 }
tolson 0:0bf629429936 32 }
tolson 0:0bf629429936 33
tolson 0:0bf629429936 34 void loadWS2803(){
tolson 0:0bf629429936 35 for(int wsBar = 0; wsBar < nBARs; wsBar++){
tolson 0:0bf629429936 36 for (int wsOut = 0; wsOut < nLEDs; wsOut++){
tolson 0:0bf629429936 37 shiftOut(ledBar[nBARs-(wsBar+1)][wsOut]);
tolson 0:0bf629429936 38 }
tolson 0:0bf629429936 39 }
tolson 0:0bf629429936 40 ws2803_clockPin = 0;
tolson 0:0bf629429936 41 wait_us(600); // 500us-600us needed to reset WS2803s
tolson 0:0bf629429936 42 }
tolson 0:0bf629429936 43
tolson 0:0bf629429936 44 void clearWS2803(){
tolson 0:0bf629429936 45 for(int wsOut = 0; wsOut < nLEDs; wsOut++){
tolson 0:0bf629429936 46 ledBar[0][wsOut] = ledBar[1][wsOut] = 0x00;
tolson 0:0bf629429936 47 loadWS2803();
tolson 0:0bf629429936 48 }
tolson 0:0bf629429936 49 }
tolson 0:0bf629429936 50
tolson 0:0bf629429936 51 int main() {
tolson 0:0bf629429936 52 // initialize WS2803s
tolson 0:0bf629429936 53 ws2803_clockPin = 0;
tolson 0:0bf629429936 54 wait_us(600);
tolson 0:0bf629429936 55
tolson 0:0bf629429936 56 while(1) {
tolson 0:0bf629429936 57 clearWS2803();
tolson 0:0bf629429936 58 wait(2.0);
tolson 0:0bf629429936 59 // Chase mode
tolson 0:0bf629429936 60 for(int iOut=7; iOut < 256; iOut*=2){
tolson 0:0bf629429936 61 for(int wsOut = 0; wsOut < nLEDs; wsOut++){
tolson 0:0bf629429936 62 ledBar[0][wsOut] = ledBar[1][wsOut] = (uint8_t)(0xFF & iOut);
tolson 0:0bf629429936 63 loadWS2803();
tolson 0:0bf629429936 64 clearWS2803();
tolson 0:0bf629429936 65 }
tolson 0:0bf629429936 66 }
tolson 0:0bf629429936 67
tolson 0:0bf629429936 68 wait(2.0);
tolson 0:0bf629429936 69 //parallel mode
tolson 0:0bf629429936 70 for(int iOut = 7; iOut < 64; iOut*=4){
tolson 0:0bf629429936 71 for(int wsOut = 0; wsOut < nLEDs; wsOut++){
tolson 0:0bf629429936 72 ledBar[0][wsOut] = ledBar[1][wsOut] = (uint8_t)(0xFF & iOut);
tolson 0:0bf629429936 73 loadWS2803();
tolson 0:0bf629429936 74 wait_us(1000000);
tolson 0:0bf629429936 75 }
tolson 0:0bf629429936 76 wait_us(10000);
tolson 0:0bf629429936 77 }
tolson 0:0bf629429936 78 }// while(1)
tolson 0:0bf629429936 79 }