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adalucio
Joined: 16 Mar 2009
Posts: 29
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| 18f4550 and nokia lcd |
 Posted: Fri Nov 19, 2010 1:53 pm |
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Hi all
I'm using nokia lcd board from sparkfun. I have successfully drived the lcd with a 16f877a. Now I'm tryng to connect it to a 18f4550 (with a crystal 20mhz).
Problem: no output on SDO line
Here is my code
main.c
| Code: |
#include "main.h"
#include "nokia.h"
//#include "font.h"
void main()
{
int16 i;
setup_adc_ports(NO_ANALOGS);
setup_adc(ADC_OFF);
setup_spi(SPI_MASTER|SPI_L_TO_H|SPI_XMIT_L_TO_H|SPI_CLK_DIV_4); // come da programma esempio
setup_wdt(WDT_OFF);
setup_timer_0(RTCC_INTERNAL|RTCC_DIV_1);
setup_timer_1(T1_DISABLED);
setup_timer_2(T2_DISABLED,0,1);
set_tris_b(0x00); // all outputs, can change to mask only hardware SPI bits if needed
set_tris_c(0x00); // all outputs, can change to mask only hardware SPI bits if needed
// ----------------------------------------------------------------------
delay_ms(200);
init_lcd();
test_colori();
while(1)
{
output_toggle(PIN_D2);
delay_ms(500);
}
}
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main.h
| Code: |
#include <18F4550.h>
#device adc=8
#FUSES NOWDT //No Watch Dog Timer
#FUSES WDT128 //Watch Dog Timer uses 1:128 Postscale
#FUSES HS //High speed Osc (> 4mhz for PCM/PCH) (>10mhz for PCD)
#FUSES NOPROTECT //Code not protected from reading
#FUSES NOBROWNOUT //No brownout reset
#FUSES BORV20 //Brownout reset at 2.0V
#FUSES PUT //Power Up Timer
#FUSES NOCPD //No EE protection
#FUSES NOSTVREN //Stack full/underflow will not cause reset
#FUSES NODEBUG //No Debug mode for ICD
#FUSES NOLVP //No low voltage prgming, B3(PIC16) or B5(PIC18) used for I/O
#FUSES NOWRT //Program memory not write protected
#FUSES NOWRTD //Data EEPROM not write protected
#FUSES NOIESO //Internal External Switch Over mode disabled
#FUSES NOFCMEN //Fail-safe clock monitor disabled
#FUSES NOPBADEN //PORTB pins are configured as digital I/O on RESET
#FUSES NOWRTC //configuration not registers write protected
#FUSES NOWRTB //Boot block not write protected
#FUSES NOEBTR //Memory not protected from table reads
#FUSES NOEBTRB //Boot block not protected from table reads
#FUSES NOCPB //No Boot Block code protection
#FUSES NOMCLR //Master Clear pin used for I/O
#FUSES LPT1OSC //Timer1 configured for low-power operation
#FUSES NOXINST //Extended set extension and Indexed Addressing mode disabled (Legacy mode)
#FUSES PLL5 //Divide By 5(20MHz oscillator input)
#FUSES CPUDIV1 //No System Clock Postscaler
#FUSES NOUSBDIV //USB clock source comes from primary oscillator
#FUSES VREGEN //USB voltage regulator enabled
#FUSES NOICPRT //ICPRT disabled
#use delay(clock=20000000)
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nokia.h
| Code: |
#define LCD_RESET PIN_C0
#define LCD_CS PIN_C1
#define SPI_DO PIN_C7
#define SPI_DI PIN_C6 //unused
#define SPI_CLK PIN_B1
#bit SSPEN = 0xFC6.5 // bit to turn on/off hardware SPI
// Epson S1D15G10 Command Set
#define DISON 0xaf
#define DISOFF 0xae
#define DISNOR 0xa6
#define DISINV 0xa7
#define SLPIN 0x95
#define SLPOUT 0x94
#define COMSCN 0xbb
#define DISCTL 0xca
#define PASET 0x75
#define CASET 0x15
#define DATCTL 0xbc
#define RGBSET8 0xce
#define RAMWR 0x5c
#define RAMRD 0x5d
#define PTLIN 0xa8
#define PTLOUT 0xa9
#define RMWIN 0xe0
#define RMWOUT 0xee
#define ASCSET 0xaa
#define SCSTART 0xab
#define OSCON 0xd1
#define OSCOFF 0xd2
#define PWRCTR 0x20
#define VOLCTR 0x81
#define VOLUP 0xd6
#define VOLDOWN 0xd7
#define TMPGRD 0x82
#define EPCTIN 0xcd
#define EPCOUT 0xcc
#define EPMWR 0xfc
#define EPMRD 0xfd
#define EPSRRD1 0x7c
#define EPSRRD2 0x7d
#define NOP 0x25
#define ENDPAGE 132
#define ENDCOL 130
/* Colori */
#define WHITE 0b11111111
#define BLACK 0b00000000
#define RED 0b11100000
#define BLUE 0b00000011
#define GREEN 0b00011100
/*
#define DarkBlue 0x02
#define LightBlue 0x03
#define DarkGreen 0x14
#define LightGreen 0x1c
#define DarkRed 0x60
#define LightRed 0xe0
#define White 0xff
#define Black 0x00
#define Yellow 0xdd
#define Purple 0x62
#define RED 0xE0 // Color Code
#define GREEN 0x1C
#define BLUE 0x03
#define YELLOW 0xFC
#define MAGENTA 0xE3
#define CYAN 0x1F
#define BLACK 0x00
#define WHITE 0xFF
*/
#use fast_io(C)
#use fast_io(B)
void spi_command(int dat)
{
output_low(LCD_CS); // enable chip
SSPEN = 0; // shut off hardware SPI allowing direct access to SPI in/out pins
output_low (SPI_DO); // output low on data out (9th bit low = command)
output_high (SPI_CLK);
delay_cycles(1); // send clock pulse
output_low (SPI_CLK);
SSPEN=1; // turn hardware SPI back on
spi_write(dat); // make PIC do the work for the command byte
output_high(LCD_CS); // disable
}
void spi_data(int dat)
{
output_low(LCD_CS); // enable chip
SSPEN = 0; // turn off hardware SPI allowing us direct access to SPI in/out pins
output_high (SPI_DO); // output high on data out (9th bit high = data)
output_high (SPI_CLK);
delay_cycles(1); // send clock pulse
output_low (SPI_CLK);
SSPEN=1; // turn hardware SPI back on
spi_write(dat); // make PIC do the work for the data byte
output_high(LCD_CS); // disable
}
void pset(unsigned char color, unsigned char x, unsigned char y)
{
// sets the starting page(row) and column (x & y) coordinates in ram,
// then writes the colour to display memory. The ending x & y are left
// maxed out so one can continue sending colour data bytes to the 'open'
// RAMWR command to fill further memory. issuing any other command
// finishes RAMWR.
x += 2; // for some reason starts at 2
spi_command(PASET); // page start/end ram
spi_data(x);
spi_data(ENDPAGE);
spi_command(CASET); // column start/end ram
spi_data(y);
spi_data(ENDCOL);
spi_command(RAMWR); // write
spi_data(color);
}
void init_lcd()
{
// reset display
output_low (SPI_CLK);
output_low (SPI_DO);
output_high (LCD_CS);
output_low (LCD_RESET);
delay_ms(100);
output_high (LCD_RESET);
//init'd, now drop CS to send commands/data and raise when finished
spi_command(DISCTL); // display control
spi_data(0x0C); // 12 = 1100 - CL dividing ratio [don't divide] switching period 8H (default)
spi_data(0x20); // 32 = (128/4)-1 (round up) number of display lines for scanning
spi_data(0x0C); // 12 = 1100 - number of lines to be inversely highlighted
spi_data(0x00);
spi_command(COMSCN); // common scanning direction
spi_data(0x01);
// 0 0 0 = 1 -> 80 81 -> 160
// 0 0 1 = 1 -> 80 81 <- 160
// 0 1 0 = 1 <- 80 81 -> 160
// 0 1 1 = 1 <- 80 81 <- 160
spi_command(OSCON); // internal oscialltor ON
spi_command(SLPOUT); // sleep out
spi_command(PWRCTR); // power ctrl
spi_data(0x0f); //everything on, no external reference resistors
delay_ms(100);
spi_command(DISINV); // invert display mode
spi_command(DATCTL); // data control
spi_data(0x00); // normal display of page/column address, page scan direction
spi_data(0x00); // normal RGB arrangement
spi_data(0x01); // 8-bit grayscale
spi_command(VOLCTR); // electronic volume, this is the contrast/brightness
spi_data(0x30); // volume (contrast) setting - fine tuning 23
spi_data(0x03); // internal resistor ratio - coarse adjustment
spi_command(RGBSET8); // setup 8-bit color lookup table [RRRGGGBB]
//RED
spi_data(0);
spi_data(2);
spi_data(4);
spi_data(6);
spi_data(8);
spi_data(10);
spi_data(12);
spi_data(15);
// GREEN
spi_data(0);
spi_data(2);
spi_data(4);
spi_data(6);
spi_data(8);
spi_data(10);
spi_data(12);
spi_data(15);
//BLUE
spi_data(0);
spi_data(4);
spi_data(9);
spi_data(15);
spi_command(NOP); // nop
delay_ms(100);
spi_command(DISON); // display on
}
void test_colori()
{
int16 i;
pset(RED, 0, 0); // red pixel top left (also sets start of bulk write, see pset routine)
for(i=1; i<=16900; i++)
{ // 130x130 = 16900
spi_data(RED); // fill screen red
}
delay_ms(2000);
pset(BLUE, 0, 0);
for(i=1; i<=16900; i++)
{ // 130x130 = 16900
spi_data(BLUE); // fill screen blue
}
delay_ms(2000);
pset(GREEN, 0, 0);
for(i=1; i<=16900; i++)
{ // 130x130 = 16900
spi_data(GREEN); // fill screen green
}
delay_ms(2000);
pset(WHITE, 0, 0);
for(i=1; i<=16900; i++)
{ // 130x130 = 16900
spi_data(WHITE); // fill screen white
}
delay_ms(2000);
pset(BLACK, 0, 0);
for(i=1; i<=16900; i++)
{ // 130x130 = 16900
spi_data(BLACK); // fill screen black
}
}
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Fri Nov 19, 2010 3:53 pm |
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Try a simple program like this, and see what you get on the SDO pin.
You should see a signal. If not, do you have some other chip connected
to that line ? Maybe that chip is holding the SDO line at a low level ?
If it doesn't work and you can't decide the reason, then post your
compiler version.
| Code: |
#include <18F4550.h>
#fuses HS,NOWDT,PUT,BROWNOUT,NOLVP
#use delay(clock=20000000)
// SPI mode definitions for 16F and 18F PICs (not for PIC24).
#define SPI_MODE_0 (SPI_L_TO_H | SPI_XMIT_L_TO_H)
#define SPI_MODE_1 (SPI_L_TO_H)
#define SPI_MODE_2 (SPI_H_TO_L)
#define SPI_MODE_3 (SPI_H_TO_L | SPI_XMIT_L_TO_H)
//======================================
void main(void)
{
setup_spi(SPI_MASTER | SPI_MODE_0 | SPI_CLK_DIV_4);
while(1)
{
spi_write(0x55);
}
} |
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adalucio
Joined: 16 Mar 2009
Posts: 29
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| Posted: Sat Nov 20, 2010 6:38 am |
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ok I have SDO output (perhaps an error of measurement before)
but no results on lcd! it is strange because the same program on 16f877 works fine.
SSPEN is correct?
| Code: |
#bit SSPEN = 0xFC6.5
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adalucio
Joined: 16 Mar 2009
Posts: 29
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| Posted: Sun Nov 21, 2010 10:00 am |
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SOLVED!!!!!
it seems that I cannot write directly SSPEN
so I have to change
to
| Code: | | setup_spi(SPI_SS_DISABLED); |
and
to
| Code: | | setup_spi(SPI_MASTER|SPI_L_TO_H|SPI_XMIT_L_TO_H|SPI_CLK_DIV_4); |
why I cannot access SSPEN directly? |
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