SeeedLedBar.h

00001 #ifndef SEEED_LED_BAR_H
00002 #define SEEED_LED_BAR_H
00003 #include "mbed.h"
00004 #include "DataClockPair.h"
00005 
00006 class SeeedLedBar {
00007   private:
00008     DigitalOut datPin_;
00009     DigitalOut clkPin_;
00010     void pin_delay(int delay_us = 2);
00011     static const int glbCmdMode_ = 0x00;
00012     void send_sixtn_bits(int sixtnBits);
00013     void set_leds(int (&ledPower )[10]);
00014   public:
00015     SeeedLedBar(DataClockPair pins);
00016     void ten_on();
00017     void ten_off();
00018     void ten_set(int (&ledPower )[10]);
00019 };
00020 
00021 SeeedLedBar::SeeedLedBar(DataClockPair pins) : datPin_(pins.dataPin), clkPin_(pins.clockPin) { }
00022 
00023 void SeeedLedBar::pin_delay(int delay_us) {
00024     wait_us(delay_us);
00025 }
00026 
00027 void SeeedLedBar::send_sixtn_bits(int sixtnBits) {
00028     for (int i = 0; i < 16; i++) {
00029         pin_delay();
00030         datPin_ = sixtnBits & 0x8000;
00031         sixtnBits <<= 1;
00032         pin_delay();
00033         clkPin_ = !clkPin_;
00034     }
00035 }
00036 
00037 void SeeedLedBar::set_leds(int (&ledPower )[10]) {
00038     send_sixtn_bits(glbCmdMode_);
00039     for (auto& i : ledPower) send_sixtn_bits(i);
00040     // Two extra empty bits for padding the command to the correct length
00041     send_sixtn_bits(0x00);
00042     send_sixtn_bits(0x00);
00043     pin_delay();
00044     datPin_ = 0;
00045     pin_delay();
00046     for (int i = 0; i < 4; i++) {
00047         pin_delay();
00048         datPin_ = 1;
00049         pin_delay();
00050         datPin_ = 0;
00051     }
00052 }
00053 
00054 void SeeedLedBar::ten_on() {
00055     int all_on[10] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
00056     set_leds(all_on);
00057 }
00058 
00059 void SeeedLedBar::ten_off() {
00060     int all_off[10] = {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
00061     set_leds(all_off);
00062 }
00063 
00064 void SeeedLedBar::ten_set(int (&ledPower )[10]) {
00065     set_leds(ledPower);
00066 }
00067 
00068 #endif