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/* vim: set ai et ts=4 sw=4: */
#include "DEV_Config.h"
#include "st7735.h"
#define DELAY 0x80
// based on Adafruit ST7735 library for Arduino
static const uint8_t
init_cmds1[] = { // Init for 7735R, part 1 (red or green tab)
15, // 15 commands in list:
ST7735_SWRESET, DELAY, // 1: Software reset, 0 args, w/delay
150, // 150 ms delay
ST7735_SLPOUT , DELAY, // 2: Out of sleep mode, 0 args, w/delay
255, // 500 ms delay
ST7735_FRMCTR1, 3 , // 3: Frame rate ctrl - normal mode, 3 args:
0x01, 0x2C, 0x2D, // Rate = fosc/(1x2+40) * (LINE+2C+2D)
ST7735_FRMCTR2, 3 , // 4: Frame rate control - idle mode, 3 args:
0x01, 0x2C, 0x2D, // Rate = fosc/(1x2+40) * (LINE+2C+2D)
ST7735_FRMCTR3, 6 , // 5: Frame rate ctrl - partial mode, 6 args:
0x01, 0x2C, 0x2D, // Dot inversion mode
0x01, 0x2C, 0x2D, // Line inversion mode
ST7735_INVCTR , 1 , // 6: Display inversion ctrl, 1 arg, no delay:
0x07, // No inversion
ST7735_PWCTR1 , 3 , // 7: Power control, 3 args, no delay:
0xA2,
0x02, // -4.6V
0x84, // AUTO mode
ST7735_PWCTR2 , 1 , // 8: Power control, 1 arg, no delay:
0xC5, // VGH25 = 2.4C VGSEL = -10 VGH = 3 * AVDD
ST7735_PWCTR3 , 2 , // 9: Power control, 2 args, no delay:
0x0A, // Opamp current small
0x00, // Boost frequency
ST7735_PWCTR4 , 2 , // 10: Power control, 2 args, no delay:
0x8A, // BCLK/2, Opamp current small & Medium low
0x2A,
ST7735_PWCTR5 , 2 , // 11: Power control, 2 args, no delay:
0x8A, 0xEE,
ST7735_VMCTR1 , 1 , // 12: Power control, 1 arg, no delay:
0x0E,
ST7735_INVOFF , 0 , // 13: Don't invert display, no args, no delay
ST7735_MADCTL , 1 , // 14: Memory access control (directions), 1 arg:
ST7735_ROTATION, // row addr/col addr, bottom to top refresh
ST7735_COLMOD , 1 , // 15: set color mode, 1 arg, no delay:
0x05 }, // 16-bit color
#if (defined(ST7735_IS_128X128) || defined(ST7735_IS_160X128))
init_cmds2[] = { // Init for 7735R, part 2 (1.44" display)
2, // 2 commands in list:
ST7735_CASET , 4 , // 1: Column addr set, 4 args, no delay:
0x00, 0x00, // XSTART = 0
0x00, 0x7F, // XEND = 127
ST7735_RASET , 4 , // 2: Row addr set, 4 args, no delay:
0x00, 0x00, // XSTART = 0
0x00, 0x7F }, // XEND = 127
#endif // ST7735_IS_128X128
#ifdef ST7735_IS_160X80
init_cmds2[] = { // Init for 7735S, part 2 (160x80 display)
3, // 3 commands in list:
ST7735_CASET , 4 , // 1: Column addr set, 4 args, no delay:
0x00, 0x00, // XSTART = 0
0x00, 0x4F, // XEND = 79
ST7735_RASET , 4 , // 2: Row addr set, 4 args, no delay:
0x00, 0x00, // XSTART = 0
0x00, 0x9F , // XEND = 159
}, // 3: Invert colors
#endif
init_cmds3[] = { // Init for 7735R, part 3 (red or green tab)
4, // 4 commands in list:
ST7735_GMCTRP1, 16 , // 1: Magical unicorn dust, 16 args, no delay:
0x02, 0x1c, 0x07, 0x12,
0x37, 0x32, 0x29, 0x2d,
0x29, 0x25, 0x2B, 0x39,
0x00, 0x01, 0x03, 0x10,
ST7735_GMCTRN1, 16 , // 2: Sparkles and rainbows, 16 args, no delay:
0x03, 0x1d, 0x07, 0x06,
0x2E, 0x2C, 0x29, 0x2D,
0x2E, 0x2E, 0x37, 0x3F,
0x00, 0x00, 0x02, 0x10,
ST7735_NORON , DELAY, // 3: Normal display on, no args, w/delay
10, // 10 ms delay
ST7735_DISPON , DELAY, // 4: Main screen turn on, no args w/delay
100 }; // 100 ms delay
static void ST7735_Select() {
// HAL_GPIO_WritePin(ST7735_CS_GPIO_Port, ST7735_CS_Pin, GPIO_PIN_RESET);
DEV_Digital_Write(EPD_CS_PIN, 0);
}
void ST7735_Unselect() {
//HAL_GPIO_WritePin(ST7735_CS_GPIO_Port, ST7735_CS_Pin, GPIO_PIN_SET);
DEV_Digital_Write(EPD_CS_PIN, 1);
}
static void ST7735_Reset() {
DEV_Digital_Write(EPD_RST_PIN, 0);
sleep_ms(5);
DEV_Digital_Write(EPD_RST_PIN, 1);
}
static void ST7735_WriteCommand(uint8_t cmd) {
//HAL_GPIO_WritePin(ST7735_DC_GPIO_Port, ST7735_DC_Pin, GPIO_PIN_RESET);
DEV_Digital_Write(EPD_DC_PIN, 0);
spi_write_blocking(SPI_PORT, &cmd, sizeof(cmd));
// HAL_SPI_Transmit(&ST7735_SPI_PORT, &cmd, sizeof(cmd), HAL_MAX_DELAY);
}
static void ST7735_WriteData(uint8_t* buff, size_t buff_size) {
//HAL_GPIO_WritePin(ST7735_DC_GPIO_Port, ST7735_DC_Pin, GPIO_PIN_SET);
DEV_Digital_Write(EPD_DC_PIN, 1);
spi_write_blocking(SPI_PORT, buff, buff_size);
// HAL_SPI_Transmit(&ST7735_SPI_PORT, buff, buff_size, HAL_MAX_DELAY);
}
static void ST7735_ExecuteCommandList(const uint8_t *addr) {
uint8_t numCommands, numArgs;
uint16_t ms;
numCommands = *addr++;
while(numCommands--) {
uint8_t cmd = *addr++;
ST7735_WriteCommand(cmd);
numArgs = *addr++;
// If high bit set, delay follows args
ms = numArgs & DELAY;
numArgs &= ~DELAY;
if(numArgs) {
ST7735_WriteData((uint8_t*)addr, numArgs);
addr += numArgs;
}
if(ms) {
ms = *addr++;
if(ms == 255) ms = 500;
sleep_ms(ms);
}
}
}
static void ST7735_SetAddressWindow(uint8_t x0, uint8_t y0, uint8_t x1, uint8_t y1) {
// column address set
ST7735_WriteCommand(ST7735_CASET);
uint8_t data[] = { 0x00, x0 + ST7735_XSTART, 0x00, x1 + ST7735_XSTART };
ST7735_WriteData(data, sizeof(data));
// row address set
ST7735_WriteCommand(ST7735_RASET);
data[1] = y0 + ST7735_YSTART;
data[3] = y1 + ST7735_YSTART;
ST7735_WriteData(data, sizeof(data));
// write to RAM
ST7735_WriteCommand(ST7735_RAMWR);
}
void ST7735_Init() {
DEV_Module_Init();
ST7735_Select();
ST7735_Reset();
ST7735_ExecuteCommandList(init_cmds1);
ST7735_ExecuteCommandList(init_cmds2);
ST7735_ExecuteCommandList(init_cmds3);
ST7735_Unselect();
}
void ST7735_DrawPixel(uint16_t x, uint16_t y, uint16_t color) {
if((x >= ST7735_WIDTH) || (y >= ST7735_HEIGHT))
return;
ST7735_Select();
ST7735_SetAddressWindow(x, y, x+1, y+1);
uint8_t data[] = { color >> 8, color & 0xFF };
ST7735_WriteData(data, sizeof(data));
ST7735_Unselect();
}
static void ST7735_WriteChar(uint16_t x, uint16_t y, char ch, FontDef font, uint16_t color, uint16_t bgcolor) {
uint32_t i, b, j;
ST7735_SetAddressWindow(x, y, x+font.width-1, y+font.height-1);
for(i = 0; i < font.height; i++) {
b = font.data[(ch - 32) * font.height + i];
for(j = 0; j < font.width; j++) {
if((b << j) & 0x8000) {
uint8_t data[] = { color >> 8, color & 0xFF };
ST7735_WriteData(data, sizeof(data));
} else {
uint8_t data[] = { bgcolor >> 8, bgcolor & 0xFF };
ST7735_WriteData(data, sizeof(data));
}
}
}
}
/*
Simpler (and probably slower) implementation:
static void ST7735_WriteChar(uint16_t x, uint16_t y, char ch, FontDef font, uint16_t color) {
uint32_t i, b, j;
for(i = 0; i < font.height; i++) {
b = font.data[(ch - 32) * font.height + i];
for(j = 0; j < font.width; j++) {
if((b << j) & 0x8000) {
ST7735_DrawPixel(x + j, y + i, color);
}
}
}
}
*/
void ST7735_WriteString(uint16_t x, uint16_t y, const char* str, FontDef font, uint16_t color, uint16_t bgcolor) {
ST7735_Select();
while(*str) {
if(x + font.width >= ST7735_WIDTH) {
x = 0;
y += font.height;
if(y + font.height >= ST7735_HEIGHT) {
break;
}
if(*str == ' ') {
// skip spaces in the beginning of the new line
str++;
continue;
}
}
ST7735_WriteChar(x, y, *str, font, color, bgcolor);
x += font.width;
str++;
}
ST7735_Unselect();
}
void ST7735_FillRectangle(uint16_t x, uint16_t y, uint16_t w, uint16_t h, uint16_t color) {
// clipping
if((x >= ST7735_WIDTH) || (y >= ST7735_HEIGHT)) return;
if((x + w - 1) >= ST7735_WIDTH) w = ST7735_WIDTH - x;
if((y + h - 1) >= ST7735_HEIGHT) h = ST7735_HEIGHT - y;
ST7735_Select();
ST7735_SetAddressWindow(x, y, x+w-1, y+h-1);
uint8_t data[] = { color >> 8, color & 0xFF };
//HAL_GPIO_WritePin(ST7735_DC_GPIO_Port, ST7735_DC_Pin, GPIO_PIN_SET);
DEV_Digital_Write(EPD_DC_PIN, 1);
for(y = h; y > 0; y--) {
for(x = w; x > 0; x--) {
// HAL_SPI_Transmit(&ST7735_SPI_PORT, data, sizeof(data), HAL_MAX_DELAY);
spi_write_blocking(SPI_PORT, data, sizeof(data));
}
}
ST7735_Unselect();
}
void ST7735_FillScreen(uint16_t color) {
ST7735_FillRectangle(0, 0, ST7735_WIDTH, ST7735_HEIGHT, color);
}
void ST7735_DrawImage(uint16_t x, uint16_t y, uint16_t w, uint16_t h, const uint8_t* data) {
ST7735_Select();
ST7735_SetAddressWindow(x, y, x+w-1, y+h-1);
ST7735_WriteData((uint8_t*)data, sizeof(uint16_t)*w*h);
ST7735_Unselect();
}
void ST7735_InvertColors(bool invert) {
ST7735_Select();
ST7735_WriteCommand(invert ? ST7735_INVON : ST7735_INVOFF);
ST7735_Unselect();
}
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