TLC5940 with MSP430G2553 wiring schematic

[EddieM 0]

Hello everyone!

 

I'm pretty new here and I would like to ask if can someone provide a correct wiring schematic for TLC5940 to MSP430G2553?

 

Thanks in advance!

[L.R.A 78]

Look here for more info:

http://forum.43oh.com/topic/2315-tlc5940-examples/

[EddieM 0]

I couldn't find any detailed schematic there for wiring the TLC5940 to the TI MSP430G2553.

[L.R.A 78]

It's all to ports 1 says here the pin:

1. #define SCLK_PIN BIT5
2. #define MOSI_PIN BIT7
3.  
4. #define GSCLK_PIN BIT4
5. #define BLANK_PIN BIT0
6. #define XLAT_PIN BIT2

 

So it's SCLK->P1.5. MOSI->P1.7, GSCLK->P1.4, BLANK->P1.0, XLAT->P1.2

[EddieM 0]

and do I have to use some resistors somewhere?

[abecedarian 330]

http://forum.43oh.com/topic/2321-tlc5940-board/#entry20577

[EddieM 0]

Thank you abecedarian !

 

Tomorrow I will try wiring up these and will test them.

[EddieM 0]

so I tried to connect the TLC5940 to the MSP430G2553 like this and I used this code:

 

#include <msp430g2553.h>

 

#define SCLK_PIN BIT5

#define MOSI_PIN BIT7

#define GSCLK_PIN BIT4

#define BLANK_PIN BITC

#define XLAT_PIN BITB

 

typedef unsigned char u_char;

 

u_char leds[16] = { 0, };

 

void updateTLC();

 

void main(void) {

 

    WDTCTL = WDTPW + WDTHOLD; // disable WDT

    BCSCTL1 = CALBC1_16MHZ; // 16MHz clock

    DCOCTL = CALDCO_16MHZ;

 

    P1OUT &= ~(BLANK_PIN + XLAT_PIN);

    P1DIR |= BLANK_PIN + XLAT_PIN;

 

    P1DIR |= GSCLK_PIN; // port 1.4 configured as SMCLK out

    P1SEL |= GSCLK_PIN;

 

    // setup timer

    CCR0 = 0xFFF;

    TACTL = TASSEL_2 + MC_1 + ID_0; // SMCLK, up mode, 1:1

    CCTL0 = CCIE; // CCR0 interrupt enabled

 

    // setup UCB0

    P1SEL |= SCLK_PIN + MOSI_PIN;

    P1SEL2 |= SCLK_PIN + MOSI_PIN;

 

    UCB0CTL0 = UCCKPH + UCMSB + UCMST + UCSYNC; // 3-pin, 8-bit SPI master

    UCB0CTL1 |= UCSSEL_2; // SMCLK

    UCB0BR0 |= 0x01; // 1:1

    UCB0BR1 = 0;

    UCB0CTL1 &= ~UCSWRST; // clear SW

 

    updateTLC();

    P1OUT |= XLAT_PIN;

    P1OUT &= ~XLAT_PIN;

 

    _bis_SR_register(GIE);

 

    leds[0] = 0x0F;

    u_char counter = 0;

    u_char direction = 0;

    while (1) {

        _delay_cycles(500000);

        if (direction) {

            counter--;

            leds[counter] = 0x0F;

            leds[counter + 1] = 0;

            if (counter == 0)

                direction = 0;

        } else {

            counter++;

            leds[counter] = 0x0F;

            leds[counter - 1] = 0;

            if (counter == 15)

                direction = 1;

        }

    }

}

 

void updateTLC() {

 

    u_char ledCounter = 8;

 

    while (ledCounter-- > 0) {

 

        UCB0TXBUF = leds[(ledCounter << 1) + 1] << 4;

        while (!(IFG2 & UCB0TXIFG))

            ; // TX buffer ready?

 

        UCB0TXBUF = leds[ledCounter << 1];

        while (!(IFG2 & UCB0TXIFG))

            ; // TX buffer ready?

 

        UCB0TXBUF = 0;

        while (!(IFG2 & UCB0TXIFG))

            ; // TX buffer ready?

    }

}

 

#pragma vector = TIMER0_A0_VECTOR

__interrupt void Timer_A0(void) {

    P1OUT |= BLANK_PIN;

    P1OUT |= XLAT_PIN;

    P1OUT &= ~XLAT_PIN;

    P1OUT &= ~BLANK_PIN;

    updateTLC();

}

 

The LEDS are all flickering, what am I doing wrong?

 

 

[RobG 1,892]

@@EddieM, try this.

 

C1 & C2 should be as close as possible to Vcc pins.

C3 is not necessary if you don't do in circuit programming.

R2 value is for 10mA current.

DCPRG & VPRG is grounded, so if you want to do more with TLC, you will have to connect them to P1.0 & P2.0

 

If you connect your TLC to LaunchPad, do not use C2, C3, & R3.

#include
 
#define SCLK_PIN BIT5
#define MOSI_PIN BIT7
 
#define GSCLK_PIN BIT4
#define BLANK_PIN BIT2
#define XLAT_PIN BIT1
 
typedef unsigned char u_char;
 
u_char leds[16] = { 0, };
 
void updateTLC();
 
void main(void) {
 
    WDTCTL = WDTPW + WDTHOLD; // disable WDT
    BCSCTL1 = CALBC1_16MHZ; // 16MHz clock
    DCOCTL = CALDCO_16MHZ;
 
    P2OUT &= ~(BLANK_PIN + XLAT_PIN);
    P2DIR |= BLANK_PIN + XLAT_PIN;
 
    P1DIR |= GSCLK_PIN; // port 1.4 configured as SMCLK out
    P1SEL |= GSCLK_PIN;
 
    // setup timer
    CCR0 = 0xFFF;
    TACTL = TASSEL_2 + MC_1 + ID_0; // SMCLK, up mode, 1:1
    CCTL0 = CCIE; // CCR0 interrupt enabled
 
    // setup UCB0
    P1SEL |= SCLK_PIN + MOSI_PIN;
    P1SEL2 |= SCLK_PIN + MOSI_PIN;
 
    UCB0CTL0 = UCCKPH + UCMSB + UCMST + UCSYNC; // 3-pin, 8-bit SPI master
    UCB0CTL1 |= UCSSEL_2; // SMCLK
    UCB0BR0 |= 0x01; // 1:1
    UCB0BR1 = 0;
    UCB0CTL1 &= ~UCSWRST; // clear SW
 
    updateTLC();
    P2OUT |= XLAT_PIN;
    P2OUT &= ~XLAT_PIN;
 
    _bis_SR_register(GIE);
 
    leds[0] = 0x0F;
    u_char counter = 0;
    u_char direction = 0;
    while (1) {
        _delay_cycles(500000);
        if (direction) {
            counter--;
            leds[counter] = 0x0F;
            leds[counter + 1] = 0;
            if (counter == 0)
                direction = 0;
        } else {
            counter++;
            leds[counter] = 0x0F;
            leds[counter - 1] = 0;
            if (counter == 15)
                direction = 1;
        }
    }
}
 
void updateTLC() {
 
    u_char ledCounter = 8;
 
    while (ledCounter-- > 0) {
 
        UCB0TXBUF = leds[(ledCounter << 1) + 1] << 4;
        while (!(IFG2 & UCB0TXIFG))
            ; // TX buffer ready?
 
        UCB0TXBUF = leds[ledCounter << 1];
        while (!(IFG2 & UCB0TXIFG))
            ; // TX buffer ready?
 
        UCB0TXBUF = 0;
        while (!(IFG2 & UCB0TXIFG))
            ; // TX buffer ready?
    }
}
 
#pragma vector = TIMER0_A0_VECTOR
__interrupt void Timer_A0(void) {
    P2OUT |= BLANK_PIN;
    P2OUT |= XLAT_PIN;
    P2OUT &= ~XLAT_PIN;
    P2OUT &= ~BLANK_PIN;
    updateTLC();
}

[EddieM 0]

Thank you RobG, it is working perfectly now. 

I appreciate the help!