TLC5958: sample code

Hi,Kenneth

i have written a code for TLC 5958  just like the sample code you provided. First i sending the GS data then the Vertical Synchronization (Vsync) Command but still i  am not getting any data  either on  OUT pins or SOUT pin. i am attaching the snapshot of GS data and vsync command . 

Image Discription:

Yellow --> SIN

Blue-->SCLK

pink -->LAT

GSdata waveform  :

Vertical Synchronization (Vsync) Command waveform :

can you check the waveform and tell me what i am doing wrong .

Thanks.

Regards,

Twinkle

Hi,Kenneth

i have written a code for TLC5958 as the sample code you have provided. In code  first i am sending the data than the Vertical Synchronization (Vsync) Command. but still I am not getting any output either on OUT pins or on SOUT pin . i am attaching the waveform of  data and the command .

Image Discription

yellow -- SIN

blue -- SCLK

pink --LAT

Data waveform :

Command Waveform ;

Can you please take a look at a waveform and tell me what i am doing wrong.

Thanks.

Regards,

Twinkle

Hi, Twinkle,

For a quick test, you can send continous GCLK after Vsync. 

But from your description, it seems this doesn't work?

For more details about GCLK please refer to the application report chapter 3.

Please also make sure the WRTGS just contain one SCLK rising edge and you input 16 times 48 bit data.

Thanks.

Regards,

Kenneth

Hi, Kenneth

I am sending WRTGS command 16 times with 48 bit data. than I am sending the Data to display at LAT falling edge. and after that i am sending vsync comamnd than giving GCLK continuously after 2.5 us delay. but not getting the desired Output. I have checked everything. The sample code that you provided is it working on any board.?  because i have tried to do that way too but it's not working. I am not able to control TLC5958 LED driver. I have checked the waveform of Vsync command and  WRTGS command and both seems ok as the information provided in application Report . but i am not able to control any OUT pins of 5958. If you have any other sample code that is working on any LED Driver Board please send me .

Thanks.

Regards,

Twinkle  

Hi, kenneth

The sample code that you provided is not working as I am not able to Control any OUT pins. I have sent you the waveform and told my issues . can you please tell me what i am doing wrong. and if the TLC59581 has the SPI interface than Provide me the Sample code for SPI communication  too.  

Thanks

Regards,

Twinkle

#include "asf.h"
#include "stdio_serial.h"
#include "conf_uart_serial.h"





#ifdef __cplusplus
extern "C" {
#endif

static struct usart_module cdc_uart_module;

static void configure_console(void)
{
	struct usart_config usart_conf;

	usart_get_config_defaults(&usart_conf);
	usart_conf.mux_setting = CONF_STDIO_MUX_SETTING;
	usart_conf.pinmux_pad0 = CONF_STDIO_PINMUX_PAD0;
	usart_conf.pinmux_pad1 = CONF_STDIO_PINMUX_PAD1;
	usart_conf.pinmux_pad2 = CONF_STDIO_PINMUX_PAD2;
	usart_conf.pinmux_pad3 = CONF_STDIO_PINMUX_PAD3;
	usart_conf.baudrate    = CONF_STDIO_BAUDRATE;

	stdio_serial_init(&cdc_uart_module, CONF_STDIO_USART_MODULE, &usart_conf);
	usart_enable(&cdc_uart_module);
}

void TLC5958_init()
{
	struct port_config pin;
	port_get_config_defaults(&pin);
	pin.direction = PORT_PIN_DIR_OUTPUT;	//Set pin direction as output 
	port_pin_set_config(PIN_PA18, &pin);    //for sin
	port_pin_set_config(PIN_PA19, &pin);    //for sclk
	port_pin_set_config(PIN_PA22, &pin);	//for LAT
	port_pin_set_config(PIN_PA23, &pin);	//for GCLK
	//	port_pin_set_config(PIN_PA13, &pin);
	//	port_pin_set_config(PIN_PB23, &pin);	//Enable
}




void SIN(char i)
{
	if(i==0)  port_pin_set_output_level(PIN_PA18,0);	//SIN LOW
	else   port_pin_set_output_level(PIN_PA18,1);		//SIN high
}

void SCLK(char i)
{
	if(i==0)  port_pin_set_output_level(PIN_PA19,0);	//SCLK LOW
	else    port_pin_set_output_level(PIN_PA19,1);		//SCLK High
}

void LAT(char i)
{
	if(i==0)  port_pin_set_output_level(PIN_PA22,0);	//LAT low
	else   port_pin_set_output_level(PIN_PA22,1);		//LAT High 
}


void GLKc(char i)
{
	if(i==0)  port_pin_set_output_level(PIN_PA23,0);		//GLK Low								
	else  port_pin_set_output_level(PIN_PA23,1);	//GCLK high
}


void send_data_48channel_command(uint16_t *temp)
{   
	uint16_t temp1,temp2;
	LAT(0);			//LAT low
	for(int k=47;k>=0;k--)
	{
		//if(k==0)
		//LAT(1);
		
		temp1=1<<(k%16);
		temp2=temp[k/16]&temp1;
		if(temp2==temp1)
		SIN(1);			//Send Data 
		else
		SIN(0);			//send Data
		
		SCLK(0);		//SCLK-low
		delay_cycles(6);
		SCLK(1);		//SCLK-high
		if(k==1)	//check value for WRTGS command 
		LAT(1);		//LAT-high
	}
	SCLK(0);		//SCLK-low
	delay_cycles(6);
	LAT(0);			//LAT-low
}


void SendVsyncData()
{
	int k;
	LAT(0);			//LAT-low
	for(k=47;k>=3;k--)
	{
		SIN(1);		//SIN high
		SCLK(0);	//SCLK low
		delay_cycles(6);
		SCLK(1);	//SCLK-high
	}
	SCLK(0);		//SCLK-low
	
	LAT(1);			//LAT- high
	for(k=2;k>=0;k--)
	{
		SIN(1);		//send SIN as high 
		SCLK(0);	//SCLK - low
		delay_cycles(6);
		SCLK(1);	//SCLK-high
	}
	SCLK(0);		//SCLK-low

	LAT(0);			//LAT-low

}











int main(void)
{

	system_init();
	//configure_console();
	delay_init();
	TLC5958_init();
	uint16_t buffer[]={0b0000111100001111,0b0000000000000000, 0b1111111111111111};
	while(1)
	{
				
		//GLKc(1);
		for(int i=0;i<16;i++)
		send_data_48channel_command(buffer);
		SendVsyncData();             
		
		/**** Send GCLK continuously 257 times ******/
		delay_us(2.5);
		for(int i=0;i<257;i++)
		{
		GLKc(1);
		GLKc(0);
		delay_us(1);
		}                      
	
	}
}
#ifdef __cplusplus
}
#endif

I am attaching my source code main that have all the information.please check the code and tell me what i am doing wrong.

Thanks

Regards

Twinkle

Hi kenneth,

I am attaching the waveform of SCLK /LAT/SIN/GCLK . 

This is the waveform when i  am sending data on LAT falling edge.

This is the waveform of WRTGS command.

After sending the GS data 16 times i am sending the vsync command .the wave form of the command is :

after that i have tried to send GCLK 257 times or in  a while(1) loop as you said but not getting the desired output on OUT pins in both conditions .

I am also attaching the snapshots of the schematics .

Diagram 1:

Diagram 2 :

Diagram 3:

please check the wave-forms and tell me if i am doing anything wrong . 

Thanks

Regards

Twinkle

Hi, Twinkle,

One thing please help to check:

Is there 17 LAT signal in the red square block?

For the schematic, I'm not able to see it clear.

But it seems you are using multiplexing. So how so you control the line control IC? Do you test whether the line control MOSFET turns ON?

Thanks.

Regards,

Kenneth

Hi Kenneth,

Yes,there are 17 latch signals, 16 for GS data & WRTGS command and 1 for Vsync command(as you mentioned in your sample code).

Line control Ic  is getting its input from out pins of TLC5958,Mosfet IC is switching correctly when checked it individually but to check its switching in the board we need output at 48 channel driver IC,that is TLC5958,WE are unable to get desired output on TLC5958 out pins.We have already checked output on OUT pins by Multi-meter but,not getting desired output.

Thanking You,

Regards,

Twinkle

Hi, Twinkle,

I'm curious about "Line control Ic  is getting its input from out pins of TLC5958".

I would suggest you to remove everything connected to OUT channels, and just add a resistor like 200ohm or an LED to Vled like 5V.

Then test the OUT to see if there is desired output.

Thanks.

Regards,

Kenneth

Hi Kenneth,

I have removed everything connected to OUT channels and just added an LED to OUT channel but still not getting the output on OUT pins. i have checked the waveform of SOUT pin it is same as SIN but i ma unable to trigger OUT channels of TLC5958.

Thanks

Regards.

Twinkle