halliburtonboy
Joined: 29 Jan 2009
Posts: 1
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| SPI register settings |
 Posted: Thu Jan 29, 2009 10:56 am |
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All,
I have never used SPI and need to learn more about using it for an lcd project. I am using the classic NOKIA 6100 code from sparkfun electronics which includes the use of SPI clock and data ouput.
I have modified the free code from the sparkfun website for use with my 18F4580 chipset with one exception. I have not changed this line of code
| Code: |
#bit SSPEN = 0x14.5
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for use with my chip....it may even be the same setting for both chipsets but I would liike to understand how to turn on the MMSP SPI module myself rather than just borrow code.
thanks for any help...
I am using pcw and have been using pics for over 4 years now, so I understand most other registers like ADCON, CCP, etc, I have just never messed with SPI.
Here is my complete LCD program (borrowed and modified).
| Code: |
//// Marcus Russell
//// Russell Evolutions Inc.
//// Nokia 6100 LCD with Epson S1D15G10 Controller
//// sample initialization program for PIC16LF872 in CCS C 3-14-07
////
//// Based on Spark Fun Electronics Code by Owen Osborn 1-22-05
//// with thanks to David Carne of SFE for DISCTL help
//// and user 'Ttelmah' from CCS C forum for SSPEN bit idea for 9-bit hardware SPI
////
//// You are free to use this code for any purpose.
////
////
//// START OF HEADER FILE ////
//#include <16F872.h>
#include <18F4580.h>
#device adc=8
#FUSES NOWDT //No Watch Dog Timer
//#FUSES XT //Crystal Osc (<= 4mhz)
#FUSES HS //HIGH SPEED OSC
#FUSES PUT //Power Up Timer
#FUSES NOPROTECT //Code not protected from reading
#FUSES NODEBUG //No Debug mode for ICD
#FUSES NOBROWNOUT //Don't Reset when brownout detected
#FUSES NOLVP //No low voltage prgming, B3(PIC16) or B5(PIC18) used for I/O
#FUSES NOCPD //No EE protection
#FUSES NOWRT //Program memory not write protected
#use delay(clock=20000000)
#define LCD_RESET PIN_C0
#define LCD_CS PIN_C1
#define SPI_CLK PIN_C3
#define SPI_DI PIN_C4 //unused
#define SPI_DO PIN_C5
#bit SSPEN = 0x14.5 // 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
//// START OF MAIN .C SOURCE FILE ////
//#include "<path to .h file cut from above>"
#use fast_io(C)
void pset(unsigned char color, unsigned char x, unsigned char y);
void spi_command(int);
void spi_data(int);
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);
setup_timer_0(RTCC_INTERNAL|RTCC_DIV_1);
setup_timer_1(T1_DISABLED);
setup_timer_2(T2_DISABLED, 0, 1);
set_tris_c(0x00); // all outputs, can change to mask only hardware SPI bits if needed
// 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(VOLCTR); // electronic volume, this is the contrast/brightness
spi_data(0x23); // volume (contrast) setting - fine tuning
spi_data(0x03); // internal resistor ratio - coarse adjustment
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(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
pset(0b11100000, 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(0b11100000); // fill screen red
}
spi_command(DISON); // display on
while (1) { // main program loop. just blinks A0 to show chip is running
output_toggle(PIN_E0);
delay_ms(500);
}
}
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 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
}
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could someone p |
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