esp32 lvgl 配置触摸驱动
时间: 2023-05-08 13:56:51 浏览: 294
ESP32作为一款强大的微控制器,在物联网领域有着广阔的应用前景,而LVGL作为嵌入式图形库则具有强大的图形渲染和事件驱动能力。本文将讲解如何在ESP32上配置LVGL的触摸屏驱动。
首先,我们需要在LVGL的配置文件中开启触摸屏驱动,一般可以通过修改`lv_conf.h`文件中的宏定义来实现:
```c
#define LV_TOUCH_DRIVER LV_TOUCH_DRIVER_FT6X36 /* 选择触摸屏驱动类型,这里以FT6X36为例 */
```
接下来,我们需要在ESP32上配置触摸屏芯片的驱动程序。假设我们使用的是FT6226触摸屏芯片,在配置驱动程序之前,我们需要基于ESP-IDF(ESP32官方开发框架)编写一个I2C总线驱动程序。在这里,我们以i2c_master_example这个驱动程序为例:
```c
/* 初始化I2C总线 */
void i2c_master_init(void)
{
i2c_config_t conf;
conf.mode = I2C_MODE_MASTER;
conf.sda_io_num = I2C_MASTER_SDA_IO;
conf.sda_pullup_en = GPIO_PULLUP_ENABLE;
conf.scl_io_num = I2C_MASTER_SCL_IO;
conf.scl_pullup_en = GPIO_PULLUP_ENABLE;
conf.master.clk_speed = I2C_MASTER_FREQ_HZ;
i2c_param_config(I2C_NUM_0, &conf);
i2c_driver_install(I2C_NUM_0, conf.mode, 0, 0, 0);
}
/* 读取FT6X36寄存器的值 */
static esp_err_t ft6x36_read_register(uint8_t reg_addr, uint8_t* buff, uint8_t len)
{
i2c_cmd_handle_t cmd = i2c_cmd_link_create();
i2c_master_start(cmd);
i2c_master_write_byte(cmd, FT6X36_ADDR << 1 | I2C_MASTER_WRITE, I2C_MASTER_ACK);
i2c_master_write_byte(cmd, reg_addr, I2C_MASTER_ACK);
i2c_master_start(cmd);
i2c_master_write_byte(cmd, FT6X36_ADDR << 1 | I2C_MASTER_READ, I2C_MASTER_ACK);
i2c_master_read(cmd, buff, len, I2C_MASTER_LAST_NACK);
i2c_master_stop(cmd);
esp_err_t ret = i2c_master_cmd_begin(I2C_NUM_0, cmd, 1000 / portTICK_PERIOD_MS);
i2c_cmd_link_delete(cmd);
return ret;
}
/* 向FT6X36写寄存器的值 */
static esp_err_t ft6x36_write_register(uint8_t reg_addr, uint8_t value)
{
i2c_cmd_handle_t cmd = i2c_cmd_link_create();
i2c_master_start(cmd);
i2c_master_write_byte(cmd, FT6X36_ADDR << 1 | I2C_MASTER_WRITE, I2C_MASTER_ACK);
i2c_master_write_byte(cmd, reg_addr, I2C_MASTER_ACK);
i2c_master_write_byte(cmd, value, I2C_MASTER_ACK);
i2c_master_stop(cmd);
esp_err_t ret = i2c_master_cmd_begin(I2C_NUM_0, cmd, 1000 / portTICK_PERIOD_MS);
i2c_cmd_link_delete(cmd);
return ret;
}
/* 配置FT6X36触摸屏芯片 */
void ft6x36_init(void)
{
i2c_master_init();
ft6x36_write_register(FT6X36_ID_G_THGROUP, 0x16);
ft6x36_write_register(FT6X36_ID_G_PACKED_DIFF, 0x82);
ft6x36_write_register(FT6X36_ID_G_G_REG, 0x07);
ft6x36_write_register(FT6X36_ID_G_THDIFF, 0x09);
ft6x36_write_register(FT6X36_ID_G_CTRL, 0x8000);
}
```
在ft6x36_init函数中,我们通过调用I2C总线驱动程序来配置FT6X36触摸屏芯片的寄存器值。
最后,在应用程序中我们需要定义触摸驱动回调函数来处理电容屏的触摸事件:
```c
/* 触摸驱动回调函数 */
bool lvgl_touch_xpt2046_driver(lv_indev_drv_t* drv, lv_indev_data_t* data)
{
/* 读取电容屏坐标 */
uint16_t x, y;
int16_t tmp_x = 0, tmp_y = 0;
bool touch_detected = xpt2046_read(&tmp_x, &tmp_y);
/* 调整坐标值 */
if (touch_detected) {
x = (tmp_x - TS_MINX) * LV_HOR_RES / (TS_MAXX - TS_MINX);
y = (tmp_y - TS_MINY) * LV_VER_RES / (TS_MAXY - TS_MINY);
data->state = LV_INDEV_STATE_PR;
data->point.x = x;
data->point.y = y;
} else {
data->state = LV_INDEV_STATE_REL;
}
return false;
}
```
以上就是在ESP32上配置LVGL的触摸屏驱动的详细过程,需要注意的是不同的触摸屏芯片可能需要不同的驱动程序,需要根据具体情况进行修改。
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