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