feat(board): 添加显示屏和PWM背光支持
- 在CMakeLists.txt中添加display_test_module.c源文件 - 在设备树配置中添加SPI3和PWM0引脚控制定义 - 配置MIPI DBI显示屏驱动，支持ST7789V控制器 - 添加PWM LED背光控制功能 - 启用GPIO复位功能并添加点击检测器配置 - 实现显示测试模块，支持彩色测试图案渲染
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230
src/display_test_module.c
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230
src/display_test_module.c
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#include <stdbool.h>
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#include <stdint.h>
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#include <app_event_manager.h>
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#define MODULE display_test_module
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#include <caf/events/module_state_event.h>
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#include <caf/events/power_event.h>
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#include <zephyr/device.h>
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#include <zephyr/drivers/display.h>
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#include <zephyr/drivers/led.h>
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#include <zephyr/logging/log.h>
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#include <zephyr/sys/util.h>
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LOG_MODULE_REGISTER(MODULE, LOG_LEVEL_INF);
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#define DISPLAY_TEST_LINE_PIXELS 320U
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#define COLOR_RED 0xF800U
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#define COLOR_GREEN 0x07E0U
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#define COLOR_BLUE 0x001FU
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#define COLOR_YELLOW 0xFFE0U
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BUILD_ASSERT(DT_HAS_CHOSEN(zephyr_display), "Missing zephyr,display chosen node");
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BUILD_ASSERT(DT_NODE_HAS_STATUS(DT_ALIAS(backlight), okay),
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"Missing backlight alias");
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static const struct device *const display_dev =
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DEVICE_DT_GET(DT_CHOSEN(zephyr_display));
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static const struct device *const backlight_dev =
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DEVICE_DT_GET(DT_PARENT(DT_ALIAS(backlight)));
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static const uint32_t backlight_idx = DT_NODE_CHILD_IDX(DT_ALIAS(backlight));
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static uint16_t line_buf[DISPLAY_TEST_LINE_PIXELS];
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static bool initialized;
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static bool running;
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static void fill_test_line(size_t width)
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{
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const uint16_t colors[] = {
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COLOR_RED,
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COLOR_GREEN,
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COLOR_BLUE,
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COLOR_YELLOW,
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};
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size_t segment = MAX(width / ARRAY_SIZE(colors), 1U);
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for (size_t x = 0; x < width; x++) {
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size_t color_idx = MIN(x / segment, ARRAY_SIZE(colors) - 1U);
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line_buf[x] = colors[color_idx];
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}
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}
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static int draw_test_pattern(void)
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{
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struct display_capabilities caps;
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struct display_buffer_descriptor desc;
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int err;
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display_get_capabilities(display_dev, &caps);
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LOG_INF("Display caps: %ux%u fmt:%u orient:%u info:0x%x",
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caps.x_resolution, caps.y_resolution,
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caps.current_pixel_format, caps.current_orientation,
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caps.screen_info);
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if (caps.x_resolution > ARRAY_SIZE(line_buf)) {
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LOG_ERR("Display width %u exceeds line buffer", caps.x_resolution);
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return -ENOMEM;
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}
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if (caps.current_pixel_format != PIXEL_FORMAT_RGB_565) {
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LOG_WRN("Unexpected pixel format %u", caps.current_pixel_format);
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}
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fill_test_line(caps.x_resolution);
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desc.width = caps.x_resolution;
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desc.height = 1U;
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desc.pitch = caps.x_resolution;
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desc.buf_size = caps.x_resolution * sizeof(line_buf[0]);
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for (uint16_t y = 0; y < caps.y_resolution; y++) {
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err = display_write(display_dev, 0U, y, &desc, line_buf);
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if (err) {
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LOG_ERR("display_write failed at line %u (%d)", y, err);
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return err;
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}
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}
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err = display_blanking_off(display_dev);
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if (err) {
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LOG_ERR("display_blanking_off failed (%d)", err);
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return err;
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}
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LOG_INF("Display test pattern rendered (%ux%u)",
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caps.x_resolution, caps.y_resolution);
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return 0;
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}
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static int module_init(void)
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{
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int err;
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LOG_INF("Display test init on %s", display_dev->name);
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if (!device_is_ready(display_dev)) {
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LOG_ERR("Display device %s not ready", display_dev->name);
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return -ENODEV;
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}
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if (!device_is_ready(backlight_dev)) {
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LOG_ERR("Backlight device %s not ready", backlight_dev->name);
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return -ENODEV;
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}
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err = led_off(backlight_dev, backlight_idx);
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if (err) {
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LOG_ERR("Backlight off failed (%d)", err);
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return err;
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}
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LOG_INF("Backlight device %s channel %u ready",
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backlight_dev->name, backlight_idx);
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return 0;
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}
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static int module_start(void)
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{
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int err;
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if (running) {
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return 0;
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}
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LOG_INF("Display test start");
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err = led_on(backlight_dev, backlight_idx);
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if (err) {
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LOG_ERR("Backlight enable failed (%d)", err);
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return err;
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}
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LOG_INF("Backlight enabled");
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k_sleep(K_MSEC(50));
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err = draw_test_pattern();
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if (err) {
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(void)led_off(backlight_dev, backlight_idx);
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return err;
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}
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running = true;
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return 0;
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}
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static void module_pause(void)
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{
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if (!running) {
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return;
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}
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LOG_INF("Display test pause");
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(void)display_blanking_on(display_dev);
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(void)led_off(backlight_dev, backlight_idx);
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running = false;
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}
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static bool app_event_handler(const struct app_event_header *aeh)
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{
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if (is_module_state_event(aeh)) {
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const struct module_state_event *event = cast_module_state_event(aeh);
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int err;
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if (check_state(event, MODULE_ID(main), MODULE_STATE_READY)) {
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LOG_INF("main READY received");
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if (!initialized) {
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err = module_init();
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if (err) {
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module_set_state(MODULE_STATE_ERROR);
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return false;
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}
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initialized = true;
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}
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err = module_start();
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if (err) {
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module_set_state(MODULE_STATE_ERROR);
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} else {
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module_set_state(MODULE_STATE_READY);
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}
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}
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return false;
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}
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if (is_power_down_event(aeh)) {
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if (initialized) {
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module_pause();
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module_set_state(MODULE_STATE_STANDBY);
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}
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return false;
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}
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if (is_wake_up_event(aeh)) {
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if (initialized) {
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int err = module_start();
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if (err) {
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module_set_state(MODULE_STATE_ERROR);
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} else {
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module_set_state(MODULE_STATE_READY);
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}
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}
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return false;
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}
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return false;
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}
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APP_EVENT_LISTENER(MODULE, app_event_handler);
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APP_EVENT_SUBSCRIBE(MODULE, module_state_event);
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APP_EVENT_SUBSCRIBE_EARLY(MODULE, power_down_event);
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APP_EVENT_SUBSCRIBE(MODULE, wake_up_event);
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