86 lines
2.4 KiB
C
86 lines
2.4 KiB
C
#include "wokwi-api.h"
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#include <stdlib.h>
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#include <stdio.h>
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typedef struct {
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pin_t cs, dc, res;
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spi_dev_t spi;
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buffer_t fb;
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uint32_t width, height;
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uint8_t spi_buffer[1];
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uint8_t page;
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uint8_t col;
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} chip_state_t;
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// Forward declarations
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static void on_cs_change(void *user_data, pin_t pin, uint32_t value);
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static void chip_spi_done(void *user_data, uint8_t *buffer, uint32_t count);
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void chip_init(void) {
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printf("Initing CH1115 chip\n");
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fflush(stdout);
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chip_state_t *chip = malloc(sizeof(chip_state_t));
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chip->fb = framebuffer_init(&chip->width, &chip->height);
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chip->cs = pin_init("CS", INPUT_PULLUP);
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chip->dc = pin_init("DC", INPUT);
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chip->res = pin_init("RES", INPUT_PULLUP);
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const spi_config_t spi_cfg = {
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.sck = pin_init("SCL", INPUT),
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.mosi = pin_init("SDA", INPUT),
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.miso = NO_PIN,
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.mode = 0,
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.done = chip_spi_done,
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.user_data = chip,
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};
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chip->spi = spi_init(&spi_cfg);
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const pin_watch_config_t cs_watch = {
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.edge = BOTH,
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.pin_change = on_cs_change,
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.user_data = chip,
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};
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pin_watch(chip->cs, &cs_watch);
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}
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static void on_cs_change(void *user_data, pin_t pin, uint32_t value) {
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chip_state_t *chip = (chip_state_t*)user_data;
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if (value == LOW) {
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// Start receiving 1 byte at a time
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spi_start(chip->spi, chip->spi_buffer, 1);
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} else {
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spi_stop(chip->spi);
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}
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}
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static void chip_spi_done(void *user_data, uint8_t *buffer, uint32_t count) {
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chip_state_t *chip = (chip_state_t*)user_data;
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if (!count) return;
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uint8_t val = buffer[0];
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bool is_data = pin_read(chip->dc) == HIGH;
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if (is_data) {
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// Write 8 vertical pixels to the Wokwi RGBA Framebuffer
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for (int i = 0; i < 8; i++) {
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// 0xFFFFFFFF = White, 0x000000FF = Black
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uint32_t color = (val & (1 << i)) ? 0xFFFFFFFF : 0x000000FF;
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uint32_t y = (chip->page * 8) + i;
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uint32_t offset = (y * chip->width + chip->col) * 4;
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buffer_write(chip->fb, offset, &color, 4);
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}
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chip->col++; // Auto-increment column
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} else {
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// CH1115 Core Commands
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if ((val & 0xB0) == 0xB0) chip->page = val & 0x0F; // Set Page Start
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else if ((val & 0xF0) == 0x00) chip->col = (chip->col & 0xF0) | (val & 0x0F); // Lower Col
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else if ((val & 0xF0) == 0x10) chip->col = (chip->col & 0x0F) | ((val & 0x0F) << 4); // Upper Col
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}
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// Continue receiving if CS is still active
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if (pin_read(chip->cs) == LOW) {
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spi_start(chip->spi, chip->spi_buffer, 1);
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}
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} |