Code:
#include <Adafruit_GFX.h>
#include <driver/gpio.h>
#include <driver/spi_master.h>
#include <esp_heap_caps.h>
namespace {
// CO16 ST7789 (GMT020-02-7P) pin mapping from kcs_co16.h.
constexpr gpio_num_t kTftSclk = GPIO_NUM_11;
constexpr gpio_num_t kTftMosi = GPIO_NUM_10;
constexpr gpio_num_t kTftMiso = GPIO_NUM_12;
constexpr gpio_num_t kTftCs = GPIO_NUM_4;
constexpr gpio_num_t kTftDc = GPIO_NUM_0;
constexpr gpio_num_t kTftReset = GPIO_NUM_5;
constexpr gpio_num_t kTftBacklight = GPIO_NUM_40;
constexpr int16_t kDisplayWidth = 320;
constexpr int16_t kDisplayHeight = 240;
constexpr int16_t kTransferChunkHeight = 10;
constexpr uint32_t kDisplaySpiFrequency = 20 * 1000 * 1000;
constexpr uint8_t kCo16Madctl = 0x68; // MX | MV | BGR.
constexpr uint16_t kBlack = 0x0000;
constexpr uint16_t kBlue = 0x001F;
constexpr uint16_t kRed = 0xF800;
constexpr uint16_t kGreen = 0x07E0;
constexpr uint16_t kCyan = 0x07FF;
constexpr uint16_t kMagenta = 0xF81F;
constexpr uint16_t kYellow = 0xFFE0;
constexpr uint16_t kWhite = 0xFFFF;
class Co16St7789 : public Adafruit_GFX {
public:
Co16St7789() : Adafruit_GFX(kDisplayWidth, kDisplayHeight) {}
bool begin() {
gpio_reset_pin(kTftCs);
gpio_set_direction(kTftCs, GPIO_MODE_OUTPUT);
gpio_set_level(kTftCs, 1);
gpio_reset_pin(kTftDc);
gpio_set_direction(kTftDc, GPIO_MODE_OUTPUT);
gpio_set_level(kTftDc, 1);
gpio_reset_pin(kTftBacklight);
gpio_set_direction(kTftBacklight, GPIO_MODE_OUTPUT);
gpio_set_level(kTftBacklight, 0);
spi_bus_config_t busConfig = {};
busConfig.sclk_io_num = kTftSclk;
busConfig.mosi_io_num = kTftMosi;
busConfig.miso_io_num = kTftMiso;
busConfig.quadwp_io_num = -1;
busConfig.quadhd_io_num = -1;
busConfig.max_transfer_sz =
kDisplayWidth * kTransferChunkHeight * sizeof(uint16_t);
esp_err_t err =
spi_bus_initialize(SPI3_HOST, &busConfig, SPI_DMA_CH_AUTO);
if (err != ESP_OK) {
Serial.printf("SPI3 initialization failed: %s\n", esp_err_to_name(err));
return false;
}
spi_device_interface_config_t deviceConfig = {};
deviceConfig.clock_speed_hz = kDisplaySpiFrequency;
deviceConfig.mode = 0;
deviceConfig.spics_io_num = -1;
deviceConfig.queue_size = 1;
err = spi_bus_add_device(SPI3_HOST, &deviceConfig, &spiDevice_);
if (err != ESP_OK) {
Serial.printf("ST7789 SPI device setup failed: %s\n",
esp_err_to_name(err));
return false;
}
drawBuffer_ = static_cast<uint8_t*>(heap_caps_malloc(
kDisplayWidth * kTransferChunkHeight * sizeof(uint16_t),
MALLOC_CAP_DMA));
if (drawBuffer_ == nullptr) {
Serial.println("ST7789 DMA buffer allocation failed");
return false;
}
// GPIO5 is shared with the optional LoRa module. Match the working KCS
// firmware and issue one reset pulse before initializing the controller.
gpio_reset_pin(kTftReset);
gpio_set_direction(kTftReset, GPIO_MODE_OUTPUT);
gpio_set_level(kTftReset, 1);
delay(1);
gpio_set_level(kTftReset, 0);
delay(1);
gpio_set_level(kTftReset, 1);
delay(10);
if (!initializeController()) {
return false;
}
fillScreen(kBlack);
delay(120);
if (!writeCommand(0x29)) { // Display on.
return false;
}
delay(120);
gpio_set_level(kTftBacklight, 1);
initialized_ = true;
return true;
}
void drawPixel(int16_t x, int16_t y, uint16_t color) override {
fillRect(x, y, 1, 1, color);
}
void writePixel(int16_t x, int16_t y, uint16_t color) override {
fillRect(x, y, 1, 1, color);
}
void fillRect(int16_t x, int16_t y, int16_t width, int16_t height,
uint16_t color) override {
if (x < 0) {
width += x;
x = 0;
}
if (y < 0) {
height += y;
y = 0;
}
if (x + width > kDisplayWidth) {
width = kDisplayWidth - x;
}
if (y + height > kDisplayHeight) {
height = kDisplayHeight - y;
}
if (drawBuffer_ == nullptr || width <= 0 || height <= 0) {
return;
}
const uint8_t high = color >> 8;
const uint8_t low = color;
for (int16_t row = y; row < y + height;
row += kTransferChunkHeight) {
const int16_t chunkHeight =
min<int16_t>(kTransferChunkHeight, y + height - row);
const size_t pixelCount = width * chunkHeight;
for (size_t index = 0; index < pixelCount; ++index) {
drawBuffer_[index * 2] = high;
drawBuffer_[index * 2 + 1] = low;
}
if (!setWindow(x, row, x + width, row + chunkHeight) ||
!writePixels(drawBuffer_, pixelCount * sizeof(uint16_t))) {
Serial.println("ST7789 pixel transfer failed");
return;
}
}
}
void writeFillRect(int16_t x, int16_t y, int16_t width, int16_t height,
uint16_t color) override {
fillRect(x, y, width, height, color);
}
bool initialized() const { return initialized_; }
private:
bool transmit(const void* data, size_t length, int dcLevel) {
if (data == nullptr || length == 0) {
return true;
}
gpio_set_level(kTftDc, dcLevel);
spi_transaction_t transaction = {};
transaction.length = length * 8;
transaction.tx_buffer = data;
const esp_err_t err = spi_device_polling_transmit(spiDevice_, &transaction);
if (err != ESP_OK) {
Serial.printf("ST7789 SPI transfer failed: %s\n", esp_err_to_name(err));
return false;
}
return true;
}
bool writeCommand(uint8_t command) {
gpio_set_level(kTftCs, 0);
const bool success = transmit(&command, sizeof(command), 0);
gpio_set_level(kTftCs, 1);
return success;
}
bool writeCommandData(uint8_t command, const uint8_t* data, size_t length) {
gpio_set_level(kTftCs, 0);
const bool success = transmit(&command, sizeof(command), 0) &&
transmit(data, length, 1);
gpio_set_level(kTftCs, 1);
return success;
}
bool setWindow(int16_t x1, int16_t y1, int16_t x2, int16_t y2) {
const uint8_t columns[] = {
static_cast<uint8_t>(x1 >> 8), static_cast<uint8_t>(x1),
static_cast<uint8_t>((x2 - 1) >> 8), static_cast<uint8_t>(x2 - 1),
};
const uint8_t rows[] = {
static_cast<uint8_t>(y1 >> 8), static_cast<uint8_t>(y1),
static_cast<uint8_t>((y2 - 1) >> 8), static_cast<uint8_t>(y2 - 1),
};
return writeCommandData(0x2A, columns, sizeof(columns)) &&
writeCommandData(0x2B, rows, sizeof(rows));
}
bool writePixels(const uint8_t* data, size_t length) {
constexpr uint8_t kRamWrite = 0x2C;
gpio_set_level(kTftCs, 0);
const bool success = transmit(&kRamWrite, sizeof(kRamWrite), 0) &&
transmit(data, length, 1);
gpio_set_level(kTftCs, 1);
return success;
}
bool initializeController() {
const uint8_t madctl[] = {kCo16Madctl};
const uint8_t displayFunction[] = {0x0A, 0x82};
const uint8_t pixelFormat[] = {0x55};
const uint8_t porchControl[] = {0x0C, 0x0C, 0x00, 0x33, 0x33};
const uint8_t gateControl[] = {0x35};
const uint8_t vcom[] = {0x28};
const uint8_t lcmControl[] = {0x0C};
const uint8_t vdvVrhEnable[] = {0x01, 0xFF};
const uint8_t vrh[] = {0x10};
const uint8_t vdv[] = {0x20};
const uint8_t frameRate[] = {0x0F};
const uint8_t powerControl[] = {0xA4, 0xA1};
const uint8_t positiveGamma[] = {
0xD0, 0x00, 0x02, 0x07, 0x0A, 0x28, 0x32,
0x44, 0x42, 0x06, 0x0E, 0x12, 0x14, 0x17,
};
const uint8_t negativeGamma[] = {
0xD0, 0x00, 0x02, 0x07, 0x0A, 0x28, 0x31,
0x54, 0x47, 0x0E, 0x1C, 0x17, 0x1B, 0x1E,
};
if (!writeCommand(0x11)) { // Sleep out.
return false;
}
delay(120);
return writeCommand(0x13) &&
writeCommandData(0x36, madctl, sizeof(madctl)) &&
writeCommandData(0xB6, displayFunction, sizeof(displayFunction)) &&
writeCommandData(0x3A, pixelFormat, sizeof(pixelFormat)) &&
(delay(10), true) &&
writeCommandData(0xB2, porchControl, sizeof(porchControl)) &&
writeCommandData(0xB7, gateControl, sizeof(gateControl)) &&
writeCommandData(0xBB, vcom, sizeof(vcom)) &&
writeCommandData(0xC0, lcmControl, sizeof(lcmControl)) &&
writeCommandData(0xC2, vdvVrhEnable, sizeof(vdvVrhEnable)) &&
writeCommandData(0xC3, vrh, sizeof(vrh)) &&
writeCommandData(0xC4, vdv, sizeof(vdv)) &&
writeCommandData(0xC6, frameRate, sizeof(frameRate)) &&
writeCommandData(0xD0, powerControl, sizeof(powerControl)) &&
writeCommandData(0xE0, positiveGamma, sizeof(positiveGamma)) &&
writeCommandData(0xE1, negativeGamma, sizeof(negativeGamma)) &&
writeCommand(0x21); // Display inversion on.
}
spi_device_handle_t spiDevice_ = nullptr;
uint8_t* drawBuffer_ = nullptr;
bool initialized_ = false;
};
Co16St7789 display;
uint32_t frameCount = 0;
void drawColorBars() {
constexpr uint16_t colors[] = {
kRed,
kGreen,
kBlue,
kCyan,
kMagenta,
kYellow,
};
constexpr size_t colorCount = sizeof(colors) / sizeof(colors[0]);
const int barWidth = kDisplayWidth / colorCount;
for (size_t index = 0; index < colorCount; ++index) {
const int x = index * barWidth;
const int width =
(index == colorCount - 1) ? kDisplayWidth - x : barWidth;
display.fillRect(x, 132, width, 44, colors[index]);
}
}
void drawStaticScreen() {
display.fillScreen(kBlack);
display.drawRect(0, 0, kDisplayWidth, kDisplayHeight, kWhite);
display.setTextWrap(false);
display.setTextColor(kCyan);
display.setTextSize(3);
display.setCursor(34, 20);
display.print("KinCony CO16");
display.setTextColor(kWhite);
display.setTextSize(2);
display.setCursor(24, 64);
display.print("ST7789 display test");
display.setCursor(24, 92);
display.print("SPI3 native driver");
drawColorBars();
display.setTextColor(kGreen);
display.setCursor(24, 194);
display.print("Frame:");
}
void updateFrameCounter() {
display.fillRect(108, 190, 190, 28, kBlack);
display.setTextColor(kGreen);
display.setTextSize(2);
display.setCursor(108, 194);
display.print(frameCount++);
}
} // namespace
void setup() {
Serial.begin(115200);
delay(1000);
Serial.println();
Serial.println("KinCony CO16 standalone ST7789 example");
Serial.printf("SPI3 SCLK=%d MOSI=%d MISO=%d CS=%d mode=0 clock=%u Hz\n",
kTftSclk, kTftMosi, kTftMiso, kTftCs,
kDisplaySpiFrequency);
Serial.printf("LCD DC=%d RESET=%d BACKLIGHT=%d\n", kTftDc, kTftReset,
kTftBacklight);
if (!display.begin()) {
Serial.println("Display initialization failed");
while (true) {
delay(1000);
}
}
drawStaticScreen();
updateFrameCounter();
Serial.printf("Display initialized: %dx%d, MADCTL=0x%02X, invert=on\n",
display.width(), display.height(), kCo16Madctl);
}
void loop() {
updateFrameCounter();
delay(1000);
}
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