/*! @file LCD.c
@brief sets and writes framebuffer
@author Hendrik Schutter
@version V1.0
@date 03.11.2020
This code displays graphics on the 320x240 LCD on an ESP-WROVER_KIT board.
Some info about the ILI9341/ST7789V: It has an C/D line, which is connected to a GPIO here. It expects this
line to be low for a command and high for data. We use a pre-transmit callback here to control that
line: every transaction has as the user-definable argument the needed state of the D/C line and just
before the transaction is sent, the callback will set this line to the correct state.
*/
#include "LCD.h"
#include "Driver.h"
esp_err_t iLCD_allocateFramebuffer(uint16_t ***pData);
void vLCD_writeChar(uint16_t u16xPos, uint16_t u16yPos, char cCharacter,uint16_t u16ColorFont,uint16_t u16ColorBackground);
uint16_t **pu16Framebuffer; //framebuffer
//ASCII Font 6x8
static const uint8_t font6_8[][6] =
{
{ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }, //sp0
{ 0x00, 0x00, 0x00, 0x2f, 0x00, 0x00 }, // !1
{ 0x00, 0x00, 0x07, 0x00, 0x07, 0x00 }, // "2
{ 0x00, 0x14, 0x7f, 0x14, 0x7f, 0x14 }, // #3
{ 0x00, 0x24, 0x2a, 0x7f, 0x2a, 0x12 }, // $4
{ 0x00, 0x62, 0x64, 0x08, 0x13, 0x23 }, // %5
{ 0x00, 0x36, 0x49, 0x55, 0x22, 0x50 }, // &6
{ 0x00, 0x00, 0x05, 0x03, 0x00, 0x00 }, // '7
{ 0x00, 0x00, 0x1c, 0x22, 0x41, 0x00 }, // (8
{ 0x00, 0x00, 0x41, 0x22, 0x1c, 0x00 }, // )9
{ 0x00, 0x14, 0x08, 0x3E, 0x08, 0x14 }, // *10
{ 0x00, 0x08, 0x08, 0x3E, 0x08, 0x08 }, // +11
{ 0x00, 0x00, 0x00, 0xA0, 0x60, 0x00 }, // ,12
{ 0x00, 0x08, 0x08, 0x08, 0x08, 0x08 }, // -13
{ 0x00, 0x00, 0x60, 0x60, 0x00, 0x00 }, // .14
{ 0x00, 0x20, 0x10, 0x08, 0x04, 0x02 }, // /15
{ 0x00, 0x3E, 0x51, 0x49, 0x45, 0x3E }, // 016
{ 0x00, 0x00, 0x42, 0x7F, 0x40, 0x00 }, // 117
{ 0x00, 0x42, 0x61, 0x51, 0x49, 0x46 }, // 218
{ 0x00, 0x21, 0x41, 0x45, 0x4B, 0x31 }, // 319
{ 0x00, 0x18, 0x14, 0x12, 0x7F, 0x10 }, // 420
{ 0x00, 0x27, 0x45, 0x45, 0x45, 0x39 }, // 521
{ 0x00, 0x3C, 0x4A, 0x49, 0x49, 0x30 }, // 622
{ 0x00, 0x01, 0x71, 0x09, 0x05, 0x03 }, // 723
{ 0x00, 0x36, 0x49, 0x49, 0x49, 0x36 }, // 824
{ 0x00, 0x06, 0x49, 0x49, 0x29, 0x1E }, // 925
{ 0x00, 0x00, 0x36, 0x36, 0x00, 0x00 }, // :26
{ 0x00, 0x00, 0x56, 0x36, 0x00, 0x00 }, // ;27
{ 0x00, 0x08, 0x14, 0x22, 0x41, 0x00 }, // <28
{ 0x00, 0x14, 0x14, 0x14, 0x14, 0x14 }, // =29
{ 0x00, 0x00, 0x41, 0x22, 0x14, 0x08 }, // >30
{ 0x00, 0x02, 0x01, 0x51, 0x09, 0x06 }, // ?31
{ 0x00, 0x32, 0x49, 0x59, 0x51, 0x3E }, // @32
{ 0x00, 0x7C, 0x12, 0x11, 0x12, 0x7C }, // A33
{ 0x00, 0x7F, 0x49, 0x49, 0x49, 0x36 }, // B34
{ 0x00, 0x3E, 0x41, 0x41, 0x41, 0x22 }, // C35
{ 0x00, 0x7F, 0x41, 0x41, 0x22, 0x1C }, // D36
{ 0x00, 0x7F, 0x49, 0x49, 0x49, 0x41 }, // E37
{ 0x00, 0x7F, 0x09, 0x09, 0x09, 0x01 }, // F38
{ 0x00, 0x3E, 0x41, 0x49, 0x49, 0x7A }, // G39
{ 0x00, 0x7F, 0x08, 0x08, 0x08, 0x7F }, // H40
{ 0x00, 0x00, 0x41, 0x7F, 0x41, 0x00 }, // I41
{ 0x00, 0x20, 0x40, 0x41, 0x3F, 0x01 }, // J42
{ 0x00, 0x7F, 0x08, 0x14, 0x22, 0x41 }, // K43
{ 0x00, 0x7F, 0x40, 0x40, 0x40, 0x40 }, // L44
{ 0x00, 0x7F, 0x02, 0x0C, 0x02, 0x7F }, // M45
{ 0x00, 0x7F, 0x04, 0x08, 0x10, 0x7F }, // N46
{ 0x00, 0x3E, 0x41, 0x41, 0x41, 0x3E }, // O47
{ 0x00, 0x7F, 0x09, 0x09, 0x09, 0x06 }, // P48
{ 0x00, 0x3E, 0x41, 0x51, 0x21, 0x5E }, // Q49
{ 0x00, 0x7F, 0x09, 0x19, 0x29, 0x46 }, // R50
{ 0x00, 0x46, 0x49, 0x49, 0x49, 0x31 }, // S51
{ 0x00, 0x01, 0x01, 0x7F, 0x01, 0x01 }, // T52
{ 0x00, 0x3F, 0x40, 0x40, 0x40, 0x3F }, // U53
{ 0x00, 0x1F, 0x20, 0x40, 0x20, 0x1F }, // V54
{ 0x00, 0x3F, 0x40, 0x38, 0x40, 0x3F }, // W55
{ 0x00, 0x63, 0x14, 0x08, 0x14, 0x63 }, // X56
{ 0x00, 0x07, 0x08, 0x70, 0x08, 0x07 }, // Y57
{ 0x00, 0x61, 0x51, 0x49, 0x45, 0x43 }, // Z58
{ 0x00, 0x00, 0x7F, 0x41, 0x41, 0x00 }, // [59
{ 0x00, 0x02, 0x04, 0x08, 0x10, 0x20 }, // \60
{ 0x00, 0x00, 0x41, 0x41, 0x7F, 0x00 }, // ]61
{ 0x00, 0x04, 0x02, 0x01, 0x02, 0x04 }, // ^62
{ 0x00, 0x40, 0x40, 0x40, 0x40, 0x40 }, // _63
{ 0x00, 0x00, 0x01, 0x02, 0x04, 0x00 }, // '64
{ 0x00, 0x20, 0x54, 0x54, 0x54, 0x78 }, // a65
{ 0x00, 0x7F, 0x48, 0x44, 0x44, 0x38 }, // b66
{ 0x00, 0x38, 0x44, 0x44, 0x44, 0x20 }, // c67
{ 0x00, 0x38, 0x44, 0x44, 0x48, 0x7F }, // d68
{ 0x00, 0x38, 0x54, 0x54, 0x54, 0x18 }, // e69
{ 0x00, 0x08, 0x7E, 0x09, 0x01, 0x02 }, // f70
{ 0x00, 0x18, 0xA4, 0xA4, 0xA4, 0x7C }, // g71
{ 0x00, 0x7F, 0x08, 0x04, 0x04, 0x78 }, // h72
{ 0x00, 0x00, 0x44, 0x7D, 0x40, 0x00 }, // i73
{ 0x00, 0x40, 0x80, 0x84, 0x7D, 0x00 }, // j74
{ 0x00, 0x7F, 0x10, 0x28, 0x44, 0x00 }, // k75
{ 0x00, 0x00, 0x41, 0x7F, 0x40, 0x00 }, // l76
{ 0x00, 0x7C, 0x04, 0x18, 0x04, 0x78 }, // m77
{ 0x00, 0x7C, 0x08, 0x04, 0x04, 0x78 }, // n78
{ 0x00, 0x38, 0x44, 0x44, 0x44, 0x38 }, // o79
{ 0x00, 0xFC, 0x24, 0x24, 0x24, 0x18 }, // p80
{ 0x00, 0x18, 0x24, 0x24, 0x18, 0xFC }, // q81
{ 0x00, 0x7C, 0x08, 0x04, 0x04, 0x08 }, // r82
{ 0x00, 0x48, 0x54, 0x54, 0x54, 0x20 }, // s83
{ 0x00, 0x04, 0x3F, 0x44, 0x40, 0x20 }, // t84
{ 0x00, 0x3C, 0x40, 0x40, 0x20, 0x7C }, // u85
{ 0x00, 0x1C, 0x20, 0x40, 0x20, 0x1C }, // v86
{ 0x00, 0x3C, 0x40, 0x30, 0x40, 0x3C }, // w87
{ 0x00, 0x44, 0x28, 0x10, 0x28, 0x44 }, // x88
{ 0x00, 0x1C, 0xA0, 0xA0, 0xA0, 0x7C }, // y89
{ 0x00, 0x44, 0x64, 0x54, 0x4C, 0x44 }, // z90
{ 0x14, 0x14, 0x14, 0x14, 0x14, 0x14 } // horiz lines91
};
/**
* @fn esp_err_t iLCD_init(void)
* @brief init
* @param void
* @return int
* @author Hendrik Schutter
* @date 3.11.2020
*/
esp_err_t iLCD_init(void) {
esp_err_t ret;
//Initialize the Driver
vDriver_init();
//Initialize the framebuffer
ret= iLCD_allocateFramebuffer(&pu16Framebuffer);
ESP_ERROR_CHECK(ret);
return ret;
}
/**
* @fn esp_err_t iLCD_allocateFramebuffer(uint16_t ***pData)
* @brief allocate framebuffer
* @param pointer of framebuffer two dimensional array
* @return esp error code
* @author Hendrik Schutter
* @date 3.11.2020
*/
esp_err_t iLCD_allocateFramebuffer(uint16_t ***pData)
{
*pData = NULL;
esp_err_t ret = ESP_OK;
//Alocate pixel memory. Each line is an array of IMAGE_W 16-bit pixels; the `*pixels` array itself contains pointers to these lines.
*pData = calloc(240, sizeof(uint16_t *));
if (*pData == NULL) {
printf("Error allocating memory for lines");
ret = ESP_ERR_NO_MEM;
}
for (int i = 0; i < 240; i++) {
(*pData)[i] = malloc(320 * sizeof(uint16_t));
if ((*pData)[i] == NULL) {
printf("Error allocating memory for line %d", i);
ret = ESP_ERR_NO_MEM;
}
}
return ret;
}
/**
* @fn esp_err_t iLCD_clearFramebuffer(uint16_t u16Color)
* @brief clear complete framebuffer with a color
* @param RGB586 color code
* @return esp error code
* @author Hendrik Schutter
* @date 3.11.2020
*/
esp_err_t iLCD_clearFramebuffer(uint16_t u16Color) {
for (int y = 0; y < 240; y++) {
for (int x = 0; x < 320; x++) {
//The LCD wants the 16-bit value in big-endian, so swap bytes
u16Color = (u16Color >> 8) | (u16Color << 8);
pu16Framebuffer[y][x] = u16Color;
}
}
return iDriver_writeFramebuffer(&pu16Framebuffer);
}
/**
* @fn esp_err_t iLCD_writeString(uint16_t u16xPos, uint16_t u16yPos, char *pcText, uint16_t u16ColorFont, uint16_t u16ColorBackground)
* @brief write string/text into framebuffer
* @param uint16_t u16xPos
* @param uint16_t u16yPos
* @param char *pcText
* @param RGB586 color code for font uint16_t u16ColorFont
* @param RGB586 color code for background uint16_t u16ColorBackground
* @return esp error code
* @author Hendrik Schutter
* @date 4.11.2020
*/
esp_err_t iLCD_writeString(uint16_t u16xPos, uint16_t u16yPos, char *pcText, uint16_t u16ColorFont, uint16_t u16ColorBackground)
{
while(*pcText != '\0')
{
if(u16xPos > LCD_WIDTH-6)
{
u16xPos = 0;
u16yPos++;
}
if(u16yPos > LCD_HIGH-8)
{
u16xPos = u16yPos = 0;
}
vLCD_writeChar(u16xPos,u16yPos,*pcText,u16ColorFont,u16ColorBackground);
u16xPos+=6;
pcText++;
}
return iDriver_writeFramebuffer(&pu16Framebuffer);
}
/**
* @fn void vLCD_writeChar(uint16_t u16xPos, uint16_t u16yPos, char cCharacter,uint16_t u16ColorFont,uint16_t u16ColorBackground)
* @brief write string/text into framebuffer
* @param uint16_t u16xPos
* @param uint16_t u16yPos
* @param char cCharacter
* @param RGB586 color code for font uint16_t u16ColorFont
* @param RGB586 color code for background uint16_t u16ColorBackground
* @return esp error code
* @author Hendrik Schutter
* @date 4.11.2020
*/
void vLCD_writeChar(uint16_t u16xPos, uint16_t u16yPos, char cCharacter, uint16_t u16ColorFont,uint16_t u16ColorBackground)
{
uint8_t u8FontIndex = (cCharacter-32);
for (uint16_t y = u16yPos; y <= (u16yPos+8); y++) {
for (uint16_t x = u16xPos; x <= (u16xPos+6); x++) {
if(font6_8[u8FontIndex] [(x-u16xPos)] & (1<<(y-u16yPos)))
{
pu16Framebuffer[y][x] = (u16ColorFont >> 8) | (u16ColorFont << 8);
} else
{
pu16Framebuffer[y][x] = (u16ColorBackground >> 8) | (u16ColorBackground << 8);
}
}
}
}