Hideto KIHARA / TLC5940SWSPI

TLC5940 library which supports SWSPI, has API to specify grayscale PWM period and has API like Arduino library.

Fork of TLC5940 by Stefan Nielsen

TLC5940.cpp@1:b188393f5b49, 2015-10-12 (annotated)

Committer:
deton
Date:
Mon Oct 12 04:28:01 2015 +0000
Revision:
1:b188393f5b49
Parent:
0:bdf7a64b89a7
Child:
2:b411648dfe54
use SWSPI for nRF51822 that does not support 12 bits format SPI.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
Julepalme 0:bdf7a64b89a7 1 #include "TLC5940.h"
deton 1:b188393f5b49 2 #define GSCLK_PERIOD 5
Julepalme 0:bdf7a64b89a7 3
deton 1:b188393f5b49 4 TLC5940::TLC5940(PinName mosi, PinName miso, PinName sck, PinName xlat, PinName blank, PinName gsclk):
deton 1:b188393f5b49 5 _spi(SWSPI(mosi, miso, sck)),
deton 1:b188393f5b49 6 _gsclk(PwmOut(gsclk)),
deton 1:b188393f5b49 7 _sclk(DigitalOut(sck)),
deton 1:b188393f5b49 8 _xlat(DigitalOut(xlat)),
deton 1:b188393f5b49 9 _blank(DigitalOut(blank)),
deton 1:b188393f5b49 10 _t(Ticker())
Julepalme 0:bdf7a64b89a7 11 {
deton 1:b188393f5b49 12 _spi.format(12,0);
deton 1:b188393f5b49 13 _spi.frequency(30000000);
deton 1:b188393f5b49 14
deton 1:b188393f5b49 15 // Turn off GSCLK
deton 1:b188393f5b49 16 _gsclk.write(0.0f);
deton 1:b188393f5b49 17 _gsclk.period_us(GSCLK_PERIOD);
deton 1:b188393f5b49 18
Julepalme 0:bdf7a64b89a7 19 // Reset to 0
Julepalme 0:bdf7a64b89a7 20 for(int i = 0; i < 16; i++)
Julepalme 0:bdf7a64b89a7 21 {
deton 1:b188393f5b49 22 gs_data[i] = 0;
deton 1:b188393f5b49 23 int whoami = _spi.write(0);
Julepalme 0:bdf7a64b89a7 24 }
deton 1:b188393f5b49 25
deton 1:b188393f5b49 26 _xlat.write(1);
deton 1:b188393f5b49 27 _xlat.write(0);
Julepalme 0:bdf7a64b89a7 28 }
Julepalme 0:bdf7a64b89a7 29
deton 1:b188393f5b49 30 void TLC5940::set(int channel, uint16_t brightness)
Julepalme 0:bdf7a64b89a7 31 {
deton 1:b188393f5b49 32 gs_data[15-channel] = brightness;
deton 1:b188393f5b49 33 }
deton 1:b188393f5b49 34
deton 1:b188393f5b49 35 void TLC5940::setAll(uint16_t brightness)
deton 1:b188393f5b49 36 {
deton 1:b188393f5b49 37 for (int i = 0; i < 16; i++)
deton 1:b188393f5b49 38 {
deton 1:b188393f5b49 39 gs_data[i] = brightness;
deton 1:b188393f5b49 40 }
Julepalme 0:bdf7a64b89a7 41 }
Julepalme 0:bdf7a64b89a7 42
Julepalme 0:bdf7a64b89a7 43 void TLC5940::flush()
Julepalme 0:bdf7a64b89a7 44 {
deton 1:b188393f5b49 45 _sclk.write(1);
deton 1:b188393f5b49 46 _sclk.write(0);
deton 1:b188393f5b49 47
Julepalme 0:bdf7a64b89a7 48 for(int i = 0; i < 16; i++){
deton 1:b188393f5b49 49 _spi.write(gs_data[i]);
Julepalme 0:bdf7a64b89a7 50 }
deton 1:b188393f5b49 51
deton 1:b188393f5b49 52 _xlat.write(1);
deton 1:b188393f5b49 53 _xlat.write(0);
Julepalme 0:bdf7a64b89a7 54 }
Julepalme 0:bdf7a64b89a7 55
Julepalme 0:bdf7a64b89a7 56 void TLC5940::run()
Julepalme 0:bdf7a64b89a7 57 {
deton 1:b188393f5b49 58 _gsclk.write(0.5f);
deton 1:b188393f5b49 59 _t.attach_us(this, &TLC5940::refresh, GSCLK_PERIOD*4096);
Julepalme 0:bdf7a64b89a7 60 }
Julepalme 0:bdf7a64b89a7 61
Julepalme 0:bdf7a64b89a7 62 void TLC5940::refresh()
Julepalme 0:bdf7a64b89a7 63 {
deton 1:b188393f5b49 64 _blank.write(1);
deton 1:b188393f5b49 65 _blank.write(0);
deton 1:b188393f5b49 66 }