crashtest-r0ket/firmware/lcd/display.c

132 lines
3.3 KiB
C

#include <display.h>
#include <sysdefs.h>
#include "lpc134x.h"
#include "core/ssp/ssp.h"
#include "gpio/gpio.h"
#include "basic/basic.h"
/**************************************************************************/
/* Utility routines to manage nokia display */
/**************************************************************************/
uint8_t lcdBuffer[RESX*RESY_B];
int inverted = 0;
#define TYPE_CMD 0
#define TYPE_DATA 1
static void select() {
/* the LCD requires 9-Bit frames */
uint32_t configReg = ( SSP_SSP0CR0_DSS_9BIT // Data size = 9-bit
| SSP_SSP0CR0_FRF_SPI // Frame format = SPI
| SSP_SSP0CR0_SCR_8); // Serial clock rate = 8
SSP_SSP0CR0 = configReg;
gpioSetValue(RB_LCD_CS, 0);
}
static void deselect() {
gpioSetValue(RB_LCD_CS, 1);
/* reset the bus to 8-Bit frames that everyone else uses */
uint32_t configReg = ( SSP_SSP0CR0_DSS_8BIT // Data size = 8-bit
| SSP_SSP0CR0_FRF_SPI // Frame format = SPI
| SSP_SSP0CR0_SCR_8); // Serial clock rate = 8
SSP_SSP0CR0 = configReg;
}
static void lcdWrite(uint8_t cd, uint8_t data) {
uint16_t frame = 0x0;
frame = cd << 8;
frame |= data;
while ((SSP_SSP0SR & (SSP_SSP0SR_TNF_NOTFULL | SSP_SSP0SR_BSY_BUSY)) != SSP_SSP0SR_TNF_NOTFULL);
SSP_SSP0DR = frame;
while ((SSP_SSP0SR & (SSP_SSP0SR_BSY_BUSY|SSP_SSP0SR_RNE_NOTEMPTY)) != SSP_SSP0SR_RNE_NOTEMPTY);
/* clear the FIFO */
frame = SSP_SSP0DR;
}
void lcdInit(void) {
sspInit(0, sspClockPolarity_Low, sspClockPhase_RisingEdge);
gpioSetValue(RB_LCD_CS, 1);
gpioSetValue(RB_LCD_RST, 1);
gpioSetDir(RB_LCD_CS, gpioDirection_Output);
gpioSetDir(RB_LCD_RST, gpioDirection_Output);
delayms(100);
gpioSetValue(RB_LCD_RST, 0);
delayms(100);
gpioSetValue(RB_LCD_RST, 1);
delayms(100);
select();
lcdWrite(TYPE_CMD,0xE2);
delayms(5);
lcdWrite(TYPE_CMD,0xAF);
lcdWrite(TYPE_CMD,0xA4);
lcdWrite(TYPE_CMD,0x2F);
lcdWrite(TYPE_CMD,0xB0);
lcdWrite(TYPE_CMD,0x10);
lcdWrite(TYPE_CMD,0x00);
uint16_t i;
for(i=0; i<100; i++)
lcdWrite(TYPE_DATA,0x00);
deselect();
}
void lcdFill(char f){
int x;
for(x=0;x<RESX*RESY_B;x++) {
lcdBuffer[x]=f;
}
};
void lcdSetPixel(char x, char y, bool f){
char y_byte = (RESY-(y+1)) / 8;
char y_off = (RESY-(y+1)) % 8;
char byte = lcdBuffer[y_byte*RESX+(RESX-(x+1))];
if (f) {
byte |= (1 << y_off);
} else {
byte &= ~(1 << y_off);
}
lcdBuffer[y_byte*RESX+(RESX-(x+1))] = byte;
}
bool lcdGetPixel(char x, char y){
char y_byte = (RESY-(y+1)) / 8;
char y_off = (RESY-(y+1)) % 8;
char byte = lcdBuffer[y_byte*RESX+(RESX-(x+1))];
return byte & (1 << y_off);
}
void lcdDisplay(uint32_t shift) {
select();
lcdWrite(TYPE_CMD,0xB0);
lcdWrite(TYPE_CMD,0x10);
lcdWrite(TYPE_CMD,0x00);
uint16_t i,page;
for(page=0; page<RESY_B;page++) {
for(i=0; i<RESX; i++) {
if (inverted) {
lcdWrite(TYPE_DATA,~lcdBuffer[page*RESX+((i+shift)%RESX)]);
} else {
lcdWrite(TYPE_DATA,lcdBuffer[page*RESX+((i+shift)%RESX)]);
}
}
}
deselect();
}
void lcdInvert(void) {
inverted = ~inverted;
}