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ili932x.cpp
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ili932x.cpp
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// IMPORTANT: LIBRARY MUST BE SPECIFICALLY CONFIGURED FOR EITHER TFT SHIELD
// OR BREAKOUT BOARD USAGE. SEE RELEVANT COMMENTS IN Adafruit_TFTLCD.h
// Graphics library by ladyada/adafruit with init code from Rossum
// MIT license
#include "Adafruit_TFTLCD_8bit_STM32.h"
#include "ili932x.h"
static uint8_t rotation;
static int _width, _height;
/*****************************************************************************/
static const uint16_t ILI932x_regValues[] = {
ILI932X_START_OSC , 0x0001, // Start oscillator
TFTLCD_DELAY , 50, // 50 millisecond delay
ILI932X_DRIV_OUT_CTRL , 0x0100,
ILI932X_DRIV_WAV_CTRL , 0x0700,
ILI932X_ENTRY_MOD , 0x1030,
ILI932X_RESIZE_CTRL , 0x0000,
ILI932X_DISP_CTRL2 , 0x0202,
ILI932X_DISP_CTRL3 , 0x0000,
ILI932X_DISP_CTRL4 , 0x0000,
ILI932X_RGB_DISP_IF_CTRL1, 0x0,
ILI932X_FRM_MARKER_POS , 0x0,
ILI932X_RGB_DISP_IF_CTRL2, 0x0,
ILI932X_POW_CTRL1 , 0x0000,
ILI932X_POW_CTRL2 , 0x0007,
ILI932X_POW_CTRL3 , 0x0000,
ILI932X_POW_CTRL4 , 0x0000,
TFTLCD_DELAY , 200,
ILI932X_POW_CTRL1 , 0x1690,
ILI932X_POW_CTRL2 , 0x0227,
TFTLCD_DELAY , 50,
ILI932X_POW_CTRL3 , 0x001A,
TFTLCD_DELAY , 50,
ILI932X_POW_CTRL4 , 0x1800,
ILI932X_POW_CTRL7 , 0x002A,
TFTLCD_DELAY , 50,
ILI932X_GAMMA_CTRL1 , 0x0000,
ILI932X_GAMMA_CTRL2 , 0x0000,
ILI932X_GAMMA_CTRL3 , 0x0000,
ILI932X_GAMMA_CTRL4 , 0x0206,
ILI932X_GAMMA_CTRL5 , 0x0808,
ILI932X_GAMMA_CTRL6 , 0x0007,
ILI932X_GAMMA_CTRL7 , 0x0201,
ILI932X_GAMMA_CTRL8 , 0x0000,
ILI932X_GAMMA_CTRL9 , 0x0000,
ILI932X_GAMMA_CTRL10 , 0x0000,
ILI932X_GRAM_HOR_AD , 0x0000,
ILI932X_GRAM_VER_AD , 0x0000,
ILI932X_HOR_START_AD , 0x0000,
ILI932X_HOR_END_AD , 0x00EF,
ILI932X_VER_START_AD , 0X0000,
ILI932X_VER_END_AD , 0x013F,
ILI932X_GATE_SCAN_CTRL1 , 0xA700, // Driver Output Control (R60h)
ILI932X_GATE_SCAN_CTRL2 , 0x0003, // Driver Output Control (R61h)
ILI932X_GATE_SCAN_CTRL3 , 0x0000, // Driver Output Control (R62h)
ILI932X_PANEL_IF_CTRL1 , 0X0010, // Panel Interface Control 1 (R90h)
ILI932X_PANEL_IF_CTRL2 , 0X0000,
ILI932X_PANEL_IF_CTRL3 , 0X0003,
ILI932X_PANEL_IF_CTRL4 , 0X1100,
ILI932X_PANEL_IF_CTRL5 , 0X0000,
ILI932X_PANEL_IF_CTRL6 , 0X0000,
ILI932X_DISP_CTRL1 , 0x0133, // Main screen turn on
};
/*****************************************************************************/
void ili932x_begin(void)
{
//Serial.println("initializing ILI932x...");
uint16_t a, d;
uint8_t i = 0;
while(i < sizeof(ILI932x_regValues) / sizeof(uint16_t)) {
a = pgm_read_word(&ILI932x_regValues[i++]);
d = pgm_read_word(&ILI932x_regValues[i++]);
if(a == TFTLCD_DELAY) delay(d);
else {
//Serial.print("writing to 0x"); Serial.print(a,HEX); Serial.print(" value: 0x"); Serial.println(d,HEX);
writeRegister16(a, d);
}
}
rotation = 0;
ili932x_setRotation(rotation);
//setAddrWindow(0, 0, TFTWIDTH-1, TFTHEIGHT-1); // done in setRotation()
}
/*****************************************************************************/
// Sets the LCD address window (and address counter, on 932X).
// Relevant to rect/screen fills and H/V lines. Input coordinates are
// assumed pre-sorted (e.g. x2 >= x1).
/*****************************************************************************/
void ili932x_setAddrWindow(int x1, int y1, int x2, int y2)
{
// Values passed are in current (possibly rotated) coordinate
// system. 932X requires hardware-native coords regardless of
// MADCTL, so rotate inputs as needed. The address counter is
// set to the top-left corner -- although fill operations can be
// done in any direction, the current screen rotation is applied
// because some users find it disconcerting when a fill does not
// occur top-to-bottom.
int x, y, t;
switch(rotation) {
default:
x = x1;
y = y1;
break;
case 1:
t = y1;
y1 = x1;
x1 = TFTWIDTH - 1 - y2;
y2 = x2;
x2 = TFTWIDTH - 1 - t;
x = x2;
y = y1;
break;
case 2:
t = x1;
x1 = TFTWIDTH - 1 - x2;
x2 = TFTWIDTH - 1 - t;
t = y1;
y1 = TFTHEIGHT - 1 - y2;
y2 = TFTHEIGHT - 1 - t;
x = x2;
y = y2;
break;
case 3:
t = x1;
x1 = y1;
y1 = TFTHEIGHT - 1 - x2;
x2 = y2;
y2 = TFTHEIGHT - 1 - t;
x = x1;
y = y2;
break;
}
//Serial.print("setAddrWindow: rot: "); Serial.print(rotation); Serial.print(", x1: "); Serial.print(x1); Serial.print(", y1: "); Serial.print(y1); Serial.print(", x2: "); Serial.print(x2); Serial.print(", y2: "); Serial.println(y2);
writeRegister16(ILI932X_HOR_START_AD, x1); // Set window address
writeRegister16(ILI932X_HOR_END_AD, x2);
writeRegister16(ILI932X_VER_START_AD, y1);
writeRegister16(ILI932X_VER_END_AD, y2);
writeRegister16(ILI932X_GRAM_HOR_AD, x ); // Set address counter to top left
writeRegister16(ILI932X_GRAM_VER_AD, y );
}
/*****************************************************************************/
void ili932x_fillScreen(uint16_t color)
{
//Serial.println("932x fill screen...");
// For the 932X, a full-screen address window is already the default
// state, just need to set the address pointer to the top-left corner.
// Although we could fill in any direction, the code uses the current
// screen rotation because some users find it disconcerting when a
// fill does not occur top-to-bottom.
uint16_t x, y;
switch(rotation) {
default: x = 0 ; y = 0 ; break;
case 1 : x = TFTWIDTH - 1; y = 0 ; break;
case 2 : x = TFTWIDTH - 1; y = TFTHEIGHT - 1; break;
case 3 : x = 0 ; y = TFTHEIGHT - 1; break;
}
writeRegister16(ILI932X_GRAM_HOR_AD, x);
writeRegister16(ILI932X_GRAM_VER_AD, y);
}
/*****************************************************************************/
void ili932x_drawPixel(int16_t x, int16_t y, uint16_t color)
{
int16_t t;
switch(rotation) {
case 1:
t = x;
x = TFTWIDTH - 1 - y;
y = t;
break;
case 2:
x = TFTWIDTH - 1 - x;
y = TFTHEIGHT - 1 - y;
break;
case 3:
t = x;
x = y;
y = TFTHEIGHT - 1 - t;
break;
}
writeRegister16(ILI932X_GRAM_HOR_AD, x);
writeRegister16(ILI932X_GRAM_VER_AD, y);
writeRegister16(ILI932X_RW_GRAM, color);
}
/*****************************************************************************/
void ili932x_invertDisplay(boolean i)
{
//uint16_t r = readReg(ILI932X_GATE_SCAN_CTRL2);
//r = i ? (r&BIT0) : (r|BIT0);
writeRegister16(ILI932X_GATE_SCAN_CTRL2, i ? 1 : 0); // MADCTL
}
/*****************************************************************************/
void ili932x_setRotation(uint8_t rot)
{
uint16_t t;
rotation = rot&3;
switch(rotation) {
default: t = 0x1030; _width = TFTWIDTH; _height = TFTHEIGHT; break;
case 1 : t = 0x1028; _width = TFTHEIGHT; _height = TFTWIDTH; break;
case 2 : t = 0x1000; _width = TFTWIDTH; _height = TFTHEIGHT; break;
case 3 : t = 0x1018; _width = TFTHEIGHT; _height = TFTWIDTH; break;
}
writeRegister16(ILI932X_ENTRY_MOD, t ); // MADCTL
//Serial.print("setRotation: w: "); Serial.print(_width-1);
// For 932X, init default full-screen address window:
ili932x_setAddrWindow(0, 0, _width-1, _height-1);
}
/*****************************************************************************/
uint16_t ili932x_readPixel(int16_t x, int16_t y)
{
int16_t t,r;
switch(rotation) {
case 1:
t = x;
x = _width - 1 - y;
y = t;
break;
case 2:
x = _width - 1 - x;
y = _height - 1 - y;
break;
case 3:
t = x;
x = y;
y = _height - 1 - t;
break;
}
writeRegister16(ILI932X_GRAM_HOR_AD, x);
writeRegister16(ILI932X_GRAM_VER_AD, y);
// Inexplicable thing: sometimes pixel read has high/low bytes
// reversed. A second read fixes this. Unsure of reason. Have
// tried adjusting timing in read8() etc. to no avail.
for(uint8_t pass=0; pass<2; pass++) {
r = readReg(ILI932X_RW_GRAM); // Read data from GRAM
}
return r;
}