initial setup

src/main.c

@@ -0,0 +1,17 @@
+#include "main.h"
+#include "hardware/gpio.h"
+#include "pico/stdlib.h"
+#include "tft.h"
+
+int main()
+{
+	gpio_init(DLED_PIN);
+	gpio_set_dir(DLED_PIN, GPIO_OUT);
+	while (true) {
+		gpio_put(DLED_PIN, 0);
+		sleep_ms(250);
+		gpio_put(DLED_PIN, 1);
+		sleep_ms(1000);
+	}
+	return 0;
+}

src/main.h

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+#include "hardware/gpio.h"
+#include "pico/stdlib.h"
+#include "tft.h"
+
+#define DLED_PIN 25
+
+// void* malloc(size_t size);
+// size_t strlen(const char* str);

src/tft.c

@@ -0,0 +1,145 @@
+#include "tft.h"
+void cmd(uint8_t cmd)
+{
+	CS_L;
+	RS_C;
+	spi_write_blocking(spi_default, &cmd, 1);
+	CS_H;
+}
+void data(uint8_t data)
+{
+	CS_L;
+	RS_D;
+	spi_write_blocking(spi_default, &data, 1);
+	CS_H;
+}
+void reset()
+{
+	sleep_ms(120);
+	gpio_put(RESET_PIN, 1);
+	sleep_ms(120);
+	gpio_put(RESET_PIN, 0);
+	sleep_ms(120);
+	gpio_put(RESET_PIN, 1);
+	sleep_ms(120);
+}
+
+void init_pins()
+{
+	gpio_init(LED_PIN);
+	gpio_set_dir(LED_PIN, GPIO_OUT);
+	gpio_put(LED_PIN, 1);
+	gpio_init(RESET_PIN);
+	gpio_set_dir(RESET_PIN, GPIO_OUT);
+	gpio_init(RS_PIN);
+	gpio_set_dir(RS_PIN, GPIO_OUT);
+	gpio_init(CS_PIN);
+	gpio_set_dir(CS_PIN, GPIO_OUT);
+	CS_H;
+	spi_init(spi_default, SPI_CLK);
+	gpio_set_function(RX_PIN, GPIO_FUNC_SPI);
+	gpio_set_function(SCK_PIN, GPIO_FUNC_SPI);
+	gpio_set_function(TX_PIN, GPIO_FUNC_SPI);
+}
+void init()
+{
+	init_pins();
+
+	write_command(0x01); // Software reset
+	sleep_ms(120);
+
+	write_command(0x11); // Sleep exit
+	sleep_ms(120);
+
+	write_command(0xF0); // Command Set control
+	write_data(0xC3);    // Enable extension command 2 partI
+
+	write_command(0xF0); // Command Set control
+	write_data(0x96);    // Enable extension command 2 partII
+
+	write_command(0x36); // Memory Data Access Control MX, MY, RGB mode
+	write_data(0x48);    // X-Mirror, Top-Left to right-Buttom, RGB
+
+	write_command(0x3A); // Interface Pixel Format
+	write_data(0x55);    // Control interface color format set to 16
+
+	write_command(0xB4); // Column inversion
+	write_data(0x01);    // 1-dot inversion
+
+	write_command(0xB6); // Display Function Control
+	write_data(0x80);    // Bypass
+	write_data(0x02);    // Source Output Scan from S1 to S960, Gate Output scan from G1 to G480, scan cycle=2
+	write_data(0x3B);    // LCD Drive Line=8*(59+1)
+
+	write_command(0xE8); // Display Output Ctrl Adjust
+	write_data(0x40);
+	write_data(0x8A);
+	write_data(0x00);
+	write_data(0x00);
+	write_data(0x29); // Source eqaulizing period time= 22.5 us
+	write_data(0x19); // Timing for "Gate start"=25 (Tclk)
+	write_data(0xA5); // Timing for "Gate End"=37 (Tclk), Gate driver EQ function ON
+	write_data(0x33);
+
+	write_command(0xC1); // Power control2
+	write_data(0x06);    // VAP(GVDD)=3.85+( vcom+vcom offset), VAN(GVCL)=-3.85+( vcom+vcom offset)
+
+	write_command(0xC2); // Power control 3
+	write_data(0xA7);    // Source driving current level=low, Gamma driving current level=High
+
+	write_command(0xC5); // VCOM Control
+	write_data(0x18);    // VCOM=0.9
+
+	sleep_ms(120);
+
+	// ST7796 Gamma Sequence
+	write_command(0xE0); // Gamma"+"
+	write_data(0xF0);
+	write_data(0x09);
+	write_data(0x0b);
+	write_data(0x06);
+	write_data(0x04);
+	write_data(0x15);
+	write_data(0x2F);
+	write_data(0x54);
+	write_data(0x42);
+	write_data(0x3C);
+	write_data(0x17);
+	write_data(0x14);
+	write_data(0x18);
+	write_data(0x1B);
+
+	write_command(0xE1); // Gamma"-"
+	write_data(0xE0);
+	write_data(0x09);
+	write_data(0x0B);
+	write_data(0x06);
+	write_data(0x04);
+	write_data(0x03);
+	write_data(0x2B);
+	write_data(0x43);
+	write_data(0x42);
+	write_data(0x3B);
+	write_data(0x16);
+	write_data(0x14);
+	write_data(0x17);
+	write_data(0x1B);
+
+	sleep_ms(120);
+
+	write_command(0xF0); // Command Set control
+	write_data(0x3C);    // Disable extension command 2 partI
+
+	write_command(0xF0); // Command Set control
+	write_data(0x69);    // Disable extension command 2 partII
+
+	CS_H;
+	sleep_ms(120);
+	CS_L;
+
+	write_command(0x29); // Display on
+}
+void set_pixel_red()
+{
+	write_data(0b111111000100000000);
+}

src/tft.h

@@ -0,0 +1,28 @@
+#ifndef TFT_H
+#define TFT_H
+
+#include "hardware/gpio.h"
+#include "hardware/spi.h"
+#include "pico/stdlib.h"
+
+#define LED_PIN 20
+#define RESET_PIN 22
+#define RS_PIN 26
+#define RX_PIN PICO_DEFAULT_SPI_RX_PIN
+#define CS_PIN PICO_DEFAULT_SPI_CSN_PIN
+#define SCK_PIN PICO_DEFAULT_SPI_SCK_PIN
+#define TX_PIN PICO_DEFAULT_SPI_TX_PIN
+#define SPI_CLK 66666666
+#define CS_L gpio_put(CS_PIN, 0)
+#define CS_H gpio_put(CS_PIN, 1)
+#define RS_C gpio_put(RS_PIN, 0)
+#define RS_D gpio_put(RS_PIN, 1)
+
+void write_command(uint8_t cmd);
+void write_data(uint8_t data);
+void reset();
+void init_pins();
+void init();
+void set_pixel_red();
+
+#endif // TFT_H