static int
am335x_lcd_sysctl_backlight(SYSCTL_HANDLER_ARGS)
{
struct am335x_lcd_softc *sc = (struct am335x_lcd_softc*)arg1;
int error;
int backlight;
backlight = sc->sc_backlight;;
error = sysctl_handle_int(oidp, &backlight, 0, req);
if (error != 0 || req->newptr == NULL)
return (error);
if (backlight < 0)
backlight = 0;
if (backlight > 100)
backlight = 100;
LCD_LOCK(sc);
error = am335x_pwm_config_ecas(PWM_UNIT, PWM_PERIOD,
backlight*PWM_PERIOD/100);
if (error == 0)
sc->sc_backlight = backlight;
LCD_UNLOCK(sc);
return (error);
}
void lcdSetRefVolt(uint8_t val)
{
LCD_LOCK();
lcdSendCtl(0x81);
lcdSendCtl(val);
LCD_UNLOCK();
}
void lcdSetRefVolt(uint8_t val)
{
#if !defined(LCD_ST7920) // No contrast setting for ST7920
LCD_LOCK();
lcdSendCtl(0x81);
lcdSendCtl(val);
LCD_UNLOCK();
#endif
}
inline void lcdInit()
{
// /home/thus/txt/datasheets/lcd/KS0713.pdf
// ~/txt/flieger/ST7565RV17.pdf from http://www.glyn.de/content.asp?wdid=132&sid=
LCD_LOCK();
PORTC_LCD_CTRL &= ~(1<<OUT_C_LCD_RES); //LCD_RES
delay_2us();
PORTC_LCD_CTRL |= (1<<OUT_C_LCD_RES); // f524 sbi 0x15, 2 IOADR-PORTC_LCD_CTRL; 21 1
delay_1_5us(1500);
for (uint8_t i=0; i<12; i++) {
lcdSendCtl(pgm_read_byte(&lcdInitSequence[i])) ;
}
g_eeGeneral.contrast = 0x22;
LCD_UNLOCK();
}
inline void lcdInit()
{
LCD_LOCK();
PORTC_LCD_CTRL &= ~(1<<OUT_C_LCD_RES); //LCD reset
_delay_us(2);
PORTC_LCD_CTRL |= (1<<OUT_C_LCD_RES); //LCD normal operation
#if defined(LCD_ST7920)
_delay_ms(40);
#else
_delay_us(1500);
#endif
for (uint8_t i=0; i<DIM(lcdInitSequence); i++) {
lcdSendCtl(pgm_read_byte(&lcdInitSequence[i])) ;
#if defined(LCD_ST7920)
_delay_us(80);
#endif
}
#if defined(LCD_ERC12864FSF)
g_eeGeneral.contrast = 0x2D;
#else
g_eeGeneral.contrast = 0x22;
#endif
LCD_UNLOCK();
}
void lcdRefresh()
{
LCD_LOCK();
uint8_t *p=displayBuf;
for(uint8_t y=0; y < 8; y++) {
lcdSendCtl(0x04);
lcdSendCtl(0x10); //column addr 0
lcdSendCtl( y | 0xB0); //page addr y
PORTC_LCD_CTRL &= ~(1<<OUT_C_LCD_CS1);
#ifdef LCD_MULTIPLEX
DDRA = 0xFF; // set LCD_DAT pins to output
#endif
PORTC_LCD_CTRL |= (1<<OUT_C_LCD_A0);
PORTC_LCD_CTRL &= ~(1<<OUT_C_LCD_RnW);
for (xcoord_t x=LCD_W; x>0; --x) {
PORTA_LCD_DAT = *p++;
PORTC_LCD_CTRL |= (1<<OUT_C_LCD_E);
PORTC_LCD_CTRL &= ~(1<<OUT_C_LCD_E);
}
PORTC_LCD_CTRL |= (1<<OUT_C_LCD_A0);
PORTC_LCD_CTRL |= (1<<OUT_C_LCD_CS1);
}
LCD_UNLOCK();
}
uint8_t lcdRefresh_ST7920(uint8_t full)
{
#else
void lcdRefresh()
{
#endif
LCD_LOCK();
#if defined(LCD_ST7920)
static uint8_t state;
uint8_t yst,yend;
uint8_t x_addr = 0;
uint8_t y_addr = 0;
uint16_t line_offset = 0;
uint8_t col_offset = 0;
uint8_t bit_count = 0;
uint8_t result;
uint8_t *p;
if(full!=0){
yst=0;
yend=64;
state=0;
}
else{
switch (state){//Since writing to ST7920 is too slow we need to split it to five bands.
default:
case 0:
yst=0;
yend=13;
state=1;
break;
case 1:
yst=13;
yend=26;
state=2;
break;
case 2:
yst=26;
yend=39;
state=3;
break;
case 3:
yst=39;
yend=52;
state=4;
break;
case 4:
yst=52;
yend=64;
state=0;
break;
}
}
for (uint8_t y=yst; y<yend; y++) {
x_addr = 0;
//Convert coordinates to weirdly-arranged 128x64 screen (the ST7920 is mapped for 256x32 displays)
if (y > 31) {
y_addr = y - 32; //Because there are only 31 addressable lines in the ST7920
x_addr += 8; //so we overflow x (7 visible bytes per line) to reach the bottom half
}
else {
y_addr = y;
}
lcdSendCtl( 0x80 | y_addr ); //Set Vertical Address
_delay_us(49);
lcdSendCtl( 0x80 | x_addr ); //Set Horizontal Address
_delay_us(49);
PORTC_LCD_CTRL |= (1<<OUT_C_LCD_A0); //HIGH RS and LOW RW will put the LCD to
PORTC_LCD_CTRL &= ~(1<<OUT_C_LCD_RnW); //Write data register mode
bit_count = y & 0x07; //Count from 0 bis 7 -> 0=0, 1=1..7=7, 8=0, 9=1...
col_offset = 1 << bit_count; //Build a value for a AND operation with the vorrect bitposition
line_offset = ( y / 8 ) * 128; //On the ST7565 there are 8 lines with each 128 bytes width
for (coord_t x=0; x<16; x++) { //Walk through 16 bytes form left to right (128 Pixel)
p=displayBuf + line_offset + ( x * 8 ); //Calculate the position of the first byte im array
// adressing the bytes sequential and set the bits at the correct position merging them with an OR operation to get all bits in one byte
// the position of the LSB is the right-most position of the byte to the ST7920
result = ((*p++ & col_offset)!=0?0x80:0);
result|= ((*p++ & col_offset)!=0?0x40:0);
result|= ((*p++ & col_offset)!=0?0x20:0);
result|= ((*p++ & col_offset)!=0?0x10:0);
result|= ((*p++ & col_offset)!=0?0x08:0);
result|= ((*p++ & col_offset)!=0?0x04:0);
result|= ((*p++ & col_offset) !=0?0x02:0);
result|= ((*p++ & col_offset)!=0?0x01:0);
PORTA_LCD_DAT = result;
PORTC_LCD_CTRL |= (1<<OUT_C_LCD_E);
_delay_us(8);
PORTC_LCD_CTRL &= ~(1<<OUT_C_LCD_E);
_delay_us(49);
}
}
#else //All other LCD
uint8_t * p = displayBuf;
for (uint8_t y=0; y < 8; y++) {
#if defined(LCD_ST7565R)
lcdSendCtl(0x01);
#else
lcdSendCtl(0x04);
#endif
lcdSendCtl(0x10); // Column addr 0
lcdSendCtl( y | 0xB0); //Page addr y
PORTC_LCD_CTRL &= ~(1<<OUT_C_LCD_CS1);
#if defined(LCD_MULTIPLEX)
DDRA = 0xFF; // Set LCD_DAT pins to output
#endif
PORTC_LCD_CTRL |= (1<<OUT_C_LCD_A0);
PORTC_LCD_CTRL &= ~(1<<OUT_C_LCD_RnW);
for (coord_t x=LCD_W; x>0; --x) {
PORTA_LCD_DAT = *p++;
PORTC_LCD_CTRL |= (1<<OUT_C_LCD_E);
PORTC_LCD_CTRL &= ~(1<<OUT_C_LCD_E);
}
PORTC_LCD_CTRL |= (1<<OUT_C_LCD_A0);
PORTC_LCD_CTRL |= (1<<OUT_C_LCD_CS1);
}
#endif
LCD_UNLOCK();
#if defined(LCD_ST7920)
return state;
#endif
}
