SPI 4 digit 7 segment displays

[Cheezewiz 0]

Actually, it does work...I used the pins referenced off the page on the Arduino website...!@, looking at the teensy website I see my mistake, its counting now,

 

Looking at the source code how do you get the other 3 digits to light up?

 

--Aaron

[RobG 1,892]

First digit's address is 0xC0 (and 0xC1, but no segments are connected.)

Second digit's is 0xC2, third is 0xC4, and the last one is 0xC6.

Segments are bit0-bit6 (a-f.)

Colon's dots are connected to bit7 of the first and the second digit.

[Cheezewiz 0]

Hi Rob,

 

Thanks!

 

By the way, how are things like this discovered ?? did I miss something in the data sheet?

[RobG 1,892]

Here's a little BP for this display.

[oetroc 1]

Hello everyone.

 

 

I am using the MSP430G2553. I am trying to do the following:

PT6961_DATASHEET.pdf

[oetroc 1]

Never mind, found out what was wrong. Was not operating the bit clock at the right frequency. PT6961 supports a minimum frequency of 300kHz, I was using 125kHz. Stupid mistake.

[neslekkim 0]

I posted an Arduino compatible sketch in the first page of this thread.

viewtopic.php?f=8&t=3225&start=10#p23243

 

I tried this code on an Arduino Due, but I cannot find what is the correct pins to use on that, have been searching all over the Arduino websites, but no.

I found some pinoutguide in the forums, looks like SS is pin 53 and Mosi is pin 51, and there are also an spi header in the middle of the board, tried all of those, but no-go..

 

Energia, is that an arduino compatible IDE for the msp430 launchpad?

[spirilis 1,265]

Sweet, got mine today, just posting a simple USCI_B example for the G2553 that echoes what RobG said for turning on all segments:

#include <msp430.h>
#include <stdint.h>

void spi_init();
uint8_t spi_transfer(uint8_t data);

int main()
{
WDTCTL = WDTPW | WDTHOLD;
DCOCTL = CALDCO_16MHZ;
BCSCTL1 = CALBC1_16MHZ;
BCSCTL2 = DIVS_2; // SMCLK = 8MHz
BCSCTL3 = LFXT1S_2; // ACLK = VLO
__delay_cycles(8000); // Wait for VLO settling
while (BCSCTL3 & LFXT1OF)
;

P1DIR |= BIT1;
P1OUT |= BIT1;
P1SEL &= ~BIT1;
P1SEL2 &= ~BIT1;
__delay_cycles(8000);

spi_init();

P1OUT &= ~BIT1;
spi_transfer(0x02); // Display mode = 6 digits, 12 segments
P1OUT |= BIT1;
P1OUT &= ~BIT1;
spi_transfer(0x40); // Data Write settings; normal, increment addr, write to display mode
P1OUT |= BIT1;
P1OUT &= ~BIT1;
spi_transfer(0x8F); // Display=ON, dimming = maximum brightness (pulse width 14/16)

P1OUT |= BIT1;

P1OUT &= ~BIT1;
spi_transfer(0xC0); spi_transfer(0xFF); // Digit 1 = All segments lit
P1OUT |= BIT1;
P1OUT &= ~BIT1;
spi_transfer(0xC2); spi_transfer(0xFF); // Digit 2 = All segments lit
P1OUT |= BIT1;
P1OUT &= ~BIT1;
spi_transfer(0xC4); spi_transfer(0xFF); // Digit 3 = All segments lit
P1OUT |= BIT1;
P1OUT &= ~BIT1;
spi_transfer(0xC6); spi_transfer(0xFF); // Digit 4 = All segments lit
P1OUT |= BIT1;

LPM4;
return 0;
}

void spi_init()
{
/* Configure ports on MSP430 device for USCI_B */
P1SEL |= BIT5 | BIT6 | BIT7;
P1SEL2 |= BIT5 | BIT6 | BIT7;

/* USCI-B specific SPI setup */
UCB0CTL1 |= UCSWRST;
UCB0CTL0 = UCCKPL | UCMST | UCMODE_0 | UCSYNC; // SPI mode 0, master
UCB0BR0 = 0x01; // SPI clocked at same speed as SMCLK
UCB0BR1 = 0x00;
UCB0CTL1 = UCSSEL_2; // Clock = SMCLK, clear UCSWRST and enables USCI_B module.
}

uint8_t spi_transfer(uint8_t data)
{
UCB0TXBUF = data;
while ( !(IFG2 & UCB0RXIFG) ) // Wait for RXIFG indicating remote byte received via SOMI

;
return UCB0RXBUF;
}

[cubeberg 540]

FYI - it looks like they got a new batch of these - there are still 100 available on eBay - http://www.ebay.com/itm/10-New-Oasis-4-D-4-Digit-LED-Display-Alphanumeric-7-Segment-RED-75-x-2-00in-/200807998834?pt=LH_DefaultDomain_0&hash=item2ec116e572