Thomas Olsson
Library for controlling LED strips or arrays based on the WS2801 3-Channel Constant Current LED Driver, like the SF 32LED/m addressable LED strip. Any two digital out capable pins can be used for clock & data. also includes a header that defines the standart HTML color names
ws2801.cpp@3:2b362d164405, 2011-06-18 (annotated)
- Committer:
- wertyfrog
- Date:
- Sat Jun 18 00:33:14 2011 +0000
- Revision:
- 3:2b362d164405
- Parent:
- 0:b964d673c7db
Who changed what in which revision?
| User | Revision | Line number | New contents of line |
|---|---|---|---|
| wertyfrog | 0:b964d673c7db | 1 | #include "ws2801.h" |
| wertyfrog | 0:b964d673c7db | 2 | #include "mbed.h" |
| wertyfrog | 0:b964d673c7db | 3 | |
| wertyfrog | 0:b964d673c7db | 4 | |
| wertyfrog | 0:b964d673c7db | 5 | //------------------------------------------------------------------------------------------------------------ |
| wertyfrog | 0:b964d673c7db | 6 | ws2801::ws2801(PinName CKI, PinName SDI, int STRIP_LENGTH, int reset_delay) : _CKI(CKI), _SDI(SDI), _STRIP_LENGTH(STRIP_LENGTH), _reset_delay(reset_delay) |
| wertyfrog | 0:b964d673c7db | 7 | { |
| wertyfrog | 0:b964d673c7db | 8 | _level=100; |
| wertyfrog | 0:b964d673c7db | 9 | //ws2801.clear(); |
| wertyfrog | 0:b964d673c7db | 10 | for(int bits = 0; bits <= _STRIP_LENGTH*24; bits++) |
| wertyfrog | 0:b964d673c7db | 11 | { |
| wertyfrog | 0:b964d673c7db | 12 | _CKI = 0; |
| wertyfrog | 0:b964d673c7db | 13 | _SDI = 0; |
| wertyfrog | 0:b964d673c7db | 14 | _CKI = 1; |
| wertyfrog | 0:b964d673c7db | 15 | } |
| wertyfrog | 0:b964d673c7db | 16 | _CKI = 0; |
| wertyfrog | 0:b964d673c7db | 17 | wait_us(_reset_delay); |
| wertyfrog | 0:b964d673c7db | 18 | } |
| wertyfrog | 0:b964d673c7db | 19 | //------------------------------------------------------------------------------------------------------------ |
| wertyfrog | 0:b964d673c7db | 20 | void ws2801::post(int *strip_colors) |
| wertyfrog | 0:b964d673c7db | 21 | { |
| wertyfrog | 0:b964d673c7db | 22 | |
| wertyfrog | 0:b964d673c7db | 23 | int strip_colors_leveled[_STRIP_LENGTH]; |
| wertyfrog | 0:b964d673c7db | 24 | uint32_t mask; |
| wertyfrog | 0:b964d673c7db | 25 | |
| wertyfrog | 0:b964d673c7db | 26 | for(int LED_number = 0 ; LED_number < _STRIP_LENGTH ; LED_number++) |
| wertyfrog | 0:b964d673c7db | 27 | { |
| wertyfrog | 0:b964d673c7db | 28 | if(_level != 100) |
| wertyfrog | 0:b964d673c7db | 29 | { |
| wertyfrog | 0:b964d673c7db | 30 | int R = ((strip_colors[LED_number] & 0x00ff0000) >> 16)*_level/100; |
| wertyfrog | 0:b964d673c7db | 31 | int G = ((strip_colors[LED_number] & 0x0000ff00) >> 8)*_level/100; |
| wertyfrog | 0:b964d673c7db | 32 | int B = (strip_colors[LED_number] & 0x000000ff)*_level/100; |
| wertyfrog | 0:b964d673c7db | 33 | strip_colors_leveled[LED_number] = (R << 16)|(G << 8)|B; |
| wertyfrog | 0:b964d673c7db | 34 | } |
| wertyfrog | 0:b964d673c7db | 35 | else strip_colors_leveled[LED_number] = strip_colors[LED_number]; |
| wertyfrog | 0:b964d673c7db | 36 | int this_led_color = strip_colors_leveled[LED_number]; //24 bits of color data |
| wertyfrog | 0:b964d673c7db | 37 | for(char color_bit = 23 ; color_bit != 255 ; color_bit--) |
| wertyfrog | 0:b964d673c7db | 38 | { |
| wertyfrog | 0:b964d673c7db | 39 | _CKI = 0; |
| wertyfrog | 0:b964d673c7db | 40 | mask = 1 << color_bit; |
| wertyfrog | 0:b964d673c7db | 41 | if(this_led_color & mask)_SDI = 1; |
| wertyfrog | 0:b964d673c7db | 42 | else _SDI = 0; |
| wertyfrog | 0:b964d673c7db | 43 | _CKI = 1; //Data is latched when clock goes high |
| wertyfrog | 0:b964d673c7db | 44 | } |
| wertyfrog | 0:b964d673c7db | 45 | } |
| wertyfrog | 0:b964d673c7db | 46 | _CKI = 0; |
| wertyfrog | 0:b964d673c7db | 47 | wait_us(_reset_delay); //Wait for 1ms to go into reset |
| wertyfrog | 0:b964d673c7db | 48 | } |
| wertyfrog | 0:b964d673c7db | 49 | //------------------------------------------------------------------------------------------------------------ |
| wertyfrog | 0:b964d673c7db | 50 | void ws2801::clear(void) |
| wertyfrog | 0:b964d673c7db | 51 | { |
| wertyfrog | 0:b964d673c7db | 52 | for(int bits = 0; bits <= _STRIP_LENGTH*24; bits++) |
| wertyfrog | 0:b964d673c7db | 53 | { |
| wertyfrog | 0:b964d673c7db | 54 | _CKI = 0; |
| wertyfrog | 0:b964d673c7db | 55 | _SDI = 0; |
| wertyfrog | 0:b964d673c7db | 56 | _CKI = 1; |
| wertyfrog | 0:b964d673c7db | 57 | } |
| wertyfrog | 0:b964d673c7db | 58 | _CKI = 0; |
| wertyfrog | 0:b964d673c7db | 59 | wait_us(_reset_delay); |
| wertyfrog | 0:b964d673c7db | 60 | } |
| wertyfrog | 0:b964d673c7db | 61 | //------------------------------------------------------------------------------------------------------------ |
| wertyfrog | 3:2b362d164405 | 62 | int ws2801::level(int level) |
| wertyfrog | 0:b964d673c7db | 63 | { |
| wertyfrog | 0:b964d673c7db | 64 | if((level <= 100) && level) |
| wertyfrog | 0:b964d673c7db | 65 | { |
| wertyfrog | 0:b964d673c7db | 66 | _level = level; |
| wertyfrog | 0:b964d673c7db | 67 | return _level; |
| wertyfrog | 0:b964d673c7db | 68 | } |
| wertyfrog | 0:b964d673c7db | 69 | return 0; |
| wertyfrog | 0:b964d673c7db | 70 | } |
| wertyfrog | 0:b964d673c7db | 71 | |
| wertyfrog | 0:b964d673c7db | 72 | //------------------------------------------------------------------------------------------------------------ |
| wertyfrog | 3:2b362d164405 | 73 | int ws2801::delay(uint32_t reset_delay) |
| wertyfrog | 0:b964d673c7db | 74 | { |
| wertyfrog | 3:2b362d164405 | 75 | if(reset_delay <= 0xffffffff)_reset_delay = reset_delay; |
| wertyfrog | 0:b964d673c7db | 76 | return _reset_delay; |
| wertyfrog | 0:b964d673c7db | 77 | } |
| wertyfrog | 0:b964d673c7db | 78 | //---------EOF---------------EOF------------------------------------------------------------------------------ |