Re: graphics and character LCD problem!!

Altera_Forum · ‎02-01-2012

I'm done on the system board kit dev cyclone iii. My system includes components such as the word file "Doc1.doc" below.

My verilog program as follows:

module bt4 (clkin_50, cpu_resetn, lcd_data, lcd_csn, lcd_d_cn, lcd_e_rdn, lcd_rstn, lcd_wen, lcd_en);

input clkin_50;

input cpu_resetn;

inout [7:0]lcd_data;

output lcd_csn;

output lcd_d_cn;

output lcd_e_rdn;

output lcd_rstn;

output lcd_wen;

output lcd_en;

nios_sys DUT (

// 1) global signals:

.clk_0(clkin_50),

.reset_n(cpu_resetn),

// the_GLCD_CSN

.out_port_from_the_GLCD_CSN(lcd_csn),

// the_GLCD_DATA

.in_port_to_the_GLCD_DATA(lcd_data[7:0]),

.out_port_from_the_GLCD_DATA(lcd_data[7:0]),

// the_GLCD_D_CN

.out_port_from_the_GLCD_D_CN(lcd_d_cn),

// the_GLCD_E_RDN

.out_port_from_the_GLCD_E_RDN(lcd_e_rdn),

// the_GLCD_RSTN

.out_port_from_the_GLCD_RSTN(lcd_rstn),

// the_GLCD_WEN

.out_port_from_the_GLCD_WEN(lcd_wen),

// the_lcd_0

.LCD_E_from_the_lcd_0(lcd_en),

.LCD_RS_from_the_lcd_0(lcd_d_cn),

.LCD_RW_from_the_lcd_0(lcd_wen),

.LCD_data_to_and_from_the_lcd_0(lcd_data[7:0])

)

;

endmodule

But when compiling errors like this in word file "Doc2.doc" below.

anybody can help me to fix errors...

thanks.....

Altera_Forum · ‎02-01-2012

The error message tells you that the signals lcd_d_cn and lcd_wen are assigned twice, which isn't possible. You need to disconnect one of the components that is connected to each pin, either the character lcd component or the PIOs.

Altera_Forum · ‎02-01-2012

--- Quote Start ---

The error message tells you that the signals lcd_d_cn and lcd_wen are assigned twice, which isn't possible. You need to disconnect one of the components that is connected to each pin, either the character lcd component or the PIOs.

--- Quote End ---

i want to use both Character and Graphics LCD at the same time. What should i do?

thanks.

Altera_Forum · ‎02-01-2012

You will need a HDL block outside the SOPC system that can connect the pins to either the LCD core or your PIOs, or dump the character LCD core and write your own software driver to control it through the PIOs.

Altera_Forum · ‎02-01-2012

--- Quote Start ---

You will need a HDL block outside the SOPC system that can connect the pins to either the LCD core or your PIOs, or dump the character LCD core and write your own software driver to control it through the PIOs.

--- Quote End ---

i don't understand.can you tell more detail?

can you do it for me?

thanks so much.....

Altera_Forum · ‎02-01-2012

for which method? With the hardware version you need a multiplexer/demultiplexer, probably controlled by another PIO port. For the software version you should find lots of example source code on the net to control a character LCD from regular PIOs.

Altera_Forum · ‎02-02-2012

Does anybody do project both LCD character & grpahic LCD. I've already done project with only character or graphics. But when i combine them, some signals have problem because of fanout.