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TLC5940 16 Channel 12-Bit PWM Driver (Simple)

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sshahryiar

Joined: 05 May 2010
Posts: 94
Location: Dhaka, Bangladesh

TLC5940 16 Channel 12-Bit PWM Driver (Simple)

Posted: Tue Apr 09, 2013 4:40 am

TLC5940.c

Code:

#define VPRG pin_B0
#define SIN pin_B1
#define SCLK pin_B2
#define XLAT pin_B3
#define BLANK pin_B4
#define DCPRG pin_B5
#define GSCLK pin_B6

#byte PORTB = 0xF81

unsigned char dcData[96] =
{
1, 1, 1, 1, 1, 1, // Ch 15
1, 1, 1, 1, 1, 1, // Ch 14
1, 1, 1, 1, 1, 1, // Ch 13
1, 1, 1, 1, 1, 1, // Ch 12
1, 1, 1, 1, 1, 1, // Ch 11
1, 1, 1, 1, 1, 1, // Ch 10
1, 1, 1, 1, 1, 1, // Ch 9
1, 1, 1, 1, 1, 1, // Ch 8
1, 1, 1, 1, 1, 1, // Ch 7
1, 1, 1, 1, 1, 1, // Ch 6
1, 1, 1, 1, 1, 1, // Ch 5
1, 1, 1, 1, 1, 1, // Ch 4
1, 1, 1, 1, 1, 1, // Ch 3
1, 1, 1, 1, 1, 1, // Ch 2
1, 1, 1, 1, 1, 1, // Ch 1
1, 1, 1, 1, 1, 1, // Ch 0
};

unsigned char gsData[192];

void TLC5940_Init();
void TLC5940_ClockInDC();
void TLC5940_SetGS_And_GS_PWM();
void changeGS(unsigned char channel, unsigned long dc);

void TLC5940_Init()
{
output_low(GSCLK);
output_low(SCLK);
output_low(DCPRG);
output_high(VPRG);
output_low(XLAT);
output_high(BLANK);
memset(gsData, 0x00, sizeof(gsData));
}

void TLC5940_ClockInDC()
{
unsigned long cnt = 0;
output_high(DCPRG);
output_high(VPRG);
while(TRUE)
{
if(cnt > 95)
{
output_high(XLAT);
output_low(XLAT);
break;
}
else
{
if(dcData[cnt])
{
output_high(SIN);
}
else
{
output_low(SIN);
}
output_high(SCLK);
output_low(SCLK);
cnt++;
}
}
}

void TLC5940_SetGS_And_GS_PWM()
{
short firstCycle = FALSE;
unsigned char Data_Cnt = 0;
unsigned long GSCLK_Cnt = 0;
if(bit_test(PORTB, 0))
{
output_low(VPRG);
firstCycle = TRUE;
}
output_low(BLANK);
while(TRUE)
{
if(GSCLK_cnt > 4095)
{
output_high(BLANK);
output_high(XLAT);
output_low(XLAT);
if(firstCycle)
{
output_high(SCLK);
output_low(SCLK);
firstCycle = FALSE;
}
break;
}
else
{
if(!(Data_Cnt > 191))
{
if(gsData[Data_cnt])
{
output_high(SIN);
}
else
{
output_low(SIN);
}
output_high(SCLK);
output_low(SCLK);
Data_Cnt++;
}
}
output_high(GSCLK);
output_low(GSCLK);
GSCLK_cnt++;
}
}

void changeGS(unsigned char channel, unsigned long dc)
{
unsigned long start = 0;
unsigned long stop = 0;
unsigned long s = 0;
short tmp = 0;
switch(channel)
{
case 1:
{
start = 168;
stop = 179;
break;
}
case 2:
{
start = 156;
stop = 167;
break;
}
case 3:
{
start = 144;
stop = 155;
break;
}
case 4:
{
start = 132;
stop = 143;
break;
}
case 5:
{
start = 120;
stop = 131;
break;
}
case 6:
{
start = 108;
stop = 119;
break;
}
case 7:
{
start = 96;
stop = 107;
break;
}
case 8:
{
start = 84;
stop = 95;
break;
}
case 9:
{
start = 72;
stop = 83;
break;
}
case 10:
{
start = 60;
stop = 71;
break;
}
case 11:
{
start = 48;
stop = 59;
break;
}
case 12:
{
start = 36;
stop = 47;
break;
}
case 13:
{
start = 24;
stop = 35;
break;
}
case 14:
{
start = 12;
stop = 23;
break;
}
case 15:
{
start = 0;
stop = 11;
break;
}
default:
{
start = 180;
stop = 191;
break;
}
}
for(s = start; s <= stop; s++)
{
tmp = bit_test(dc, (stop - s));
gsData[s] = tmp;
}
}

Example

Code:

#include <18F252.h>

#device *= 16
#device ADC = 10

#fuses H4, NOWDT, PUT, PROTECT, NOSTVREN
#fuses NOCPB, NOWRT, NOWRTB NOEBTRB, NOEBTR
#fuses BROWNOUT, CPD, NOOSCSEN, BORV20
#fuses NOLVP, NODEBUG, NOWRTC, NOWRTD

#use delay(clock = 40MHz)

#include "TLC5940.c"

#define reload1 63035
#define reload2 40000

short update_flag = 0;
short pol = 1;
signed long d = 0;

void setup();

#int_timer1

void update()
{
set_timer1(reload1);
update_flag = 1;
}

#int_timer0

void update_cycle()
{
set_timer0(reload2);
if(pol)
{
d += 5;
if(d == 4095)
{
pol = 0;
d = 4095;
}
}
else
{
d -= 5;
if(d <= 0)
{
pol = 1;
d = 0;
}
}
}

void main()
{
setup();
while(TRUE)
{
if(update_flag)
{
setup_timer_1(T1_disabled);
TLC5940_SetGS_And_GS_PWM();
set_timer1(reload1);
setup_timer_1(T1_internal);
update_flag = 0;
}

changeGS(0, d);
changeGS(2, d);
changeGS(4, d);
changeGS(6, d);

changeGS(1, (4095 - d));
changeGS(3, (4095 - d));
changeGS(5, (4095 - d));
changeGS(7, (4095 - d));

changeGS(8, d);
changeGS(10, d);
changeGS(12, d);
changeGS(14, d);

changeGS(9, (4095 - d));
changeGS(11, (4095 - d));
changeGS(13, (4095 - d));
changeGS(15, (4095 - d));
};
}

void setup()
{
disable_interrupts(global);
setup_WDT(WDT_off);
setup_adc_ports(no_analogs);
setup_adc(ADC_off);
setup_timer_0(T0_internal);
setup_timer_1(T1_internal);
setup_timer_2(T2_DISABLED,255,1);
setup_timer_3(T3_DISABLED);
setup_CCP1(CCP_off);
setup_CCP2(CCP_off);
setup_SPI(SPI_DISABLED);
set_timer0(reload2);
set_timer1(reload1);
set_timer2(0);
set_timer3(0);
delay_ms(100);
enable_interrupts(global);
enable_interrupts(int_timer1);
enable_interrupts(int_timer0);
TLC5940_Init();
TLC5940_ClockInDC();
}

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SShahryiar

mhjccsinfo

Joined: 17 Oct 2011
Posts: 23
Location: Iran-tehran


Posted: Wed Sep 18, 2013 10:34 am

Hello Dear Shahryar, could you explain a little about the IC? it was not clear from the datasheet that it's just for LED driving or for all-purpose PWM usage. how much is this chip output_freq (by 50 percents duty_cycle)? tnx _________________ thanks and hope of success for you Mohammad_Hosein

TMLtech

Joined: 20 Jul 2011
Posts: 21
Location: Finland


Posted: Wed Sep 25, 2013 11:39 am

Thanks for sharing your code. I'll test your code for my next project.

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