驱动文件移植解析
5 Dec 2024
Read time: 18 minute(s)
本节描述了 GT911 触摸屏驱动的初始化和配置示例，包括 I2C 通信、GPIO 引脚配置以及触摸事件的处理。
主要功能模块简介
-
I2C 通信初始化：
gt911_client.bus用于存储 I2C 总线设备。查找并打开I2C总线设备：gt911_client.bus = (struct rt_i2c_bus_device *)rt_device_find(cfg->dev_name); if (gt911_client.bus == RT_NULL) { LOG_E("Can't find %s device", cfg->dev_name); return -RT_ERROR; } if (rt_device_open((rt_device_t)gt911_client.bus, RT_DEVICE_FLAG_RDWR) != RT_EOK) { LOG_E("open %s device failed", cfg->dev_name); return -RT_ERROR; }gt911_client.client_addr设置从机设备地址。gt911_client.client_addr = GT911_ADDRESS_HIGH;
-
GPIO引脚配置：
rt_gt911_gpio_cfg() 函数配置复位引脚和中断引脚。
配置复位引脚和中断引脚为输入模式，并设置中断模式：static int rt_gt911_gpio_cfg() { unsigned int g, p; long pin; pin = drv_pin_get(AIC_TOUCH_PANEL_RST_PIN); g = GPIO_GROUP(pin); p = GPIO_GROUP_PIN(pin); hal_gpio_direction_input(g, p); pin = drv_pin_get(AIC_TOUCH_PANEL_INT_PIN); g = GPIO_GROUP(pin); p = GPIO_GROUP_PIN(pin); hal_gpio_direction_input(g, p); hal_gpio_set_irq_mode(g, p, 0); return 0; } -
触摸设备注册：
rt_hw_gt911_init() 函数完成触摸设备的初始化和注册。
分配内存并初始化触摸设备结构体，然后注册该设备：static int rt_hw_gt911_init(const char *name, struct rt_touch_config *cfg) { touch_device = (struct rt_touch_device *)rt_malloc(sizeof(struct rt_touch_device)); if (touch_device == RT_NULL) { LOG_E("touch device malloc fail"); return -RT_ERROR; } rt_memset((void *)touch_device, 0, sizeof(struct rt_touch_device)); touch_device->info.type = RT_TOUCH_TYPE_CAPACITANCE; touch_device->info.vendor = RT_TOUCH_VENDOR_GT; rt_memcpy(&touch_device->config, cfg, sizeof(struct rt_touch_config)); touch_device->ops = >911_touch_ops; if (RT_EOK != rt_hw_touch_register(touch_device, name, RT_DEVICE_FLAG_INT_RX, RT_NULL)) { LOG_E("touch device gt911 init failed !!!"); return -RT_ERROR; } LOG_I("touch device gt911 init success"); return RT_EOK; } -
触摸事件处理：
- gt911_read_point()
读取触摸点信息：
static rt_err_t gt911_read_point(struct rt_touch_device *touch, void *buf, rt_size_t read_num) - gt911_control() 控制 TP
设备，如获取ID、校准等：
static rt_err_t gt911_control(struct rt_touch_device *touch, int cmd, void *arg)
- gt911_read_point()
读取触摸点信息：
-
设备自动加载：
使用宏 INIT_DEVICE_EXPORT(rt_hw_gt911_port) 实现驱动在系统启动时自动加载：INIT_DEVICE_EXPORT(rt_hw_gt911_port);
完整代码示例
#include <rtthread.h>
#include <rtdevice.h>
#include <string.h>
#define DBG_TAG "gt911"
#define DBG_LVL DBG_INFO
#include <rtdbg.h>
#include "gt911.h"
//dev结构体定义，其他TP也需要定义这个变量
static struct rt_i2c_client gt911_client;
//这个是gt911特有的数组用于更改固件的，没这需求的可以不定义
static rt_uint8_t GT911_CFG_TBL[] = {
0x6b, 0x00, 0x04, 0x58, 0x02, 0x05, 0x0d, 0x00, 0x01, 0x0f, 0x28, 0x0f,
0x50, 0x32, 0x03, 0x05, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x8a, 0x2a, 0x0c, 0x45, 0x47, 0x0c, 0x08, 0x00, 0x00,
0x00, 0x40, 0x03, 0x2c, 0x00, 0x01, 0x00, 0x00, 0x00, 0x03, 0x64, 0x32,
0x00, 0x00, 0x00, 0x28, 0x64, 0x94, 0xd5, 0x02, 0x07, 0x00, 0x00, 0x04,
0x95, 0x2c, 0x00, 0x8b, 0x34, 0x00, 0x82, 0x3f, 0x00, 0x7d, 0x4c, 0x00,
0x7a, 0x5b, 0x00, 0x7a, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x18, 0x16, 0x14, 0x12, 0x10, 0x0e, 0x0c, 0x0a,
0x08, 0x06, 0x04, 0x02, 0xff, 0xff, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x16, 0x18,
0x1c, 0x1d, 0x1e, 0x1f, 0x20, 0x21, 0x22, 0x24, 0x13, 0x12, 0x10, 0x0f,
0x0a, 0x08, 0x06, 0x04, 0x02, 0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x79, 0x01,
};
/*
* I2C写函数，主要传参有三个：dev,要写入的数据，写入数据的长度
* 这个函数适用于所有的TP，编写的时候只需要更换函数名字，跟TP对应上即可
*/
static rt_err_t gt911_write_reg(struct rt_i2c_client *dev, rt_uint8_t *data,
rt_uint8_t len)
{
struct rt_i2c_msg msgs;
//从机的设备地址，在初始化的时候会进行赋值
msgs.addr = dev->client_addr;
//I2C读写标志，这里是写标志
msgs.flags = RT_I2C_WR;
//要发送的数据
msgs.buf = data;
//数据长度
msgs.len = len;
if (rt_i2c_transfer(dev->bus, &msgs, 1) == 1) {
return RT_EOK;
} else {
return -RT_ERROR;
}
}
/*
* I2C读函数，主要传参有四个：dev,要读取的寄存器地址，接受数据的buf，读取的长度
* 这个函数适用于所有的TP，编写的时候只需要更换函数名字，跟TP对应上即可
*/
static rt_err_t gt911_read_regs(struct rt_i2c_client *dev, rt_uint8_t *reg,
rt_uint8_t *data, rt_uint8_t len)
{
struct rt_i2c_msg msgs[2];
msgs[0].addr = dev->client_addr;
msgs[0].flags = RT_I2C_WR;
/*
* 要读取得寄存器地址,目前市面上有两种常见得TP，一种是16位寄存器地址的，一种是8位的
* 16位的寄存器地址需要先发送高8位，再发送低8位，分成两个buf
* 8位的直接发送即可
*/
msgs[0].buf = reg;
// 这里的长度对应上面的16位或者8位，16位长度为2，8位长度为1
msgs[0].len = GT911_REGITER_LEN;
msgs[1].addr = dev->client_addr;
msgs[1].flags = RT_I2C_RD;
msgs[1].buf = data;
msgs[1].len = len;
if (rt_i2c_transfer(dev->bus, msgs, 2) == 2) {
return RT_EOK;
} else {
return -RT_ERROR;
}
}
/*
* 这个函数主要用于获取TP的ID，有些TP并没有具体获取ID的寄存器公开，可以不添加
*/
static rt_err_t gt911_get_product_id(struct rt_i2c_client *dev,
rt_uint8_t *data, rt_uint8_t len)
{
rt_uint8_t reg[2];
// 这里就是将16位的寄存器地址拆开高8位低8位两个buf进行传输
reg[0] = (rt_uint8_t)(GT911_PRODUCT_ID >> 8);
reg[1] = (rt_uint8_t)(GT911_PRODUCT_ID & 0xff);
if (gt911_read_regs(dev, reg, data, len) != RT_EOK) {
LOG_E("read id failed");
return -RT_ERROR;
}
return RT_EOK;
}
/*
* 这个函数主要用于获取TP的参数，包括：xy的坐标范围最大值，触摸点的个数
*/
static rt_err_t gt911_get_info(struct rt_i2c_client *dev,
struct rt_touch_info *info)
{
rt_uint8_t reg[2];
rt_uint8_t out_info[7];
rt_uint8_t out_len = 7;
reg[0] = (rt_uint8_t)(GT911_CONFIG_REG >> 8);
reg[1] = (rt_uint8_t)(GT911_CONFIG_REG & 0xFF);
if (gt911_read_regs(dev, reg, out_info, out_len) != RT_EOK) {
LOG_E("read info failed");
return -RT_ERROR;
}
/*
* 这里是对获取到的数据进行组合得到参数信息
* 有些TP对这些寄存器并不开放，因此我们也可以通过直接赋值的方法设置参数
* 设置的参数要跟TP自带的固件对应上才能正常使用，具体操作如下
*/
info->range_x = (out_info[2] << 8) | out_info[1];
//info->range_x = AIC_TOUCH_X_COORDINATE_RANGE;
//这里的AIC_TOUCH_X_COORDINATE_RANGE就是公用参数那里可以配置的，所以不同TP都可通用
info->range_y = (out_info[4] << 8) | out_info[3];
//info->range_y = AIC_TOUCH_Y_COORDINATE_RANGE;
//这里的AIC_TOUCH_Y_COORDINATE_RANGE也是公用参数那里可以配置的，所以不同TP都可通用
info->point_num = out_info[5] & 0x0f;
//info->point_num = 5;
if (info->point_num > GT911_MAX_TOUCH) {
info->point_num = GT911_MAX_TOUCH;
rt_kprintf("Warning,tp support more than 5 points, limited to 5 points\n");
}
return RT_EOK;
}
/*
* 这里的静态变量主要是为了存储坐标点的数据，然后作逻辑判断
* GT911_MAX_TOUCH是最大的触摸点个数也就是上面info->point_num定义的5，所以数组赋值了5个-1作为初始值
* 不同的触摸个数这个数组大小不一样
*/
static int16_t pre_x[GT911_MAX_TOUCH] = { -1, -1, -1, -1, -1 };
static int16_t pre_y[GT911_MAX_TOUCH] = { -1, -1, -1, -1, -1 };
//这个pre_w是触摸面积的定义,有些TP并没有相关描述，所以不是必须的，但xy是必须要有
static int16_t pre_w[GT911_MAX_TOUCH] = { -1, -1, -1, -1, -1 };
static rt_uint8_t s_tp_dowm[GT911_MAX_TOUCH] = {0};
static struct rt_touch_data *read_data = RT_NULL;
/*
* 这个是抬起事件上报函数，修改函数明即可使用
* 如果定义上面的静态数组的时候没有定义pre_w则下面代码关于pre_w的要删除
*/
static void gt911_touch_up(void *buf, int8_t id)
{
read_data = (struct rt_touch_data *)buf;
if (s_tp_dowm[id] == 1) {
s_tp_dowm[id] = 0;
read_data[id].event = RT_TOUCH_EVENT_UP;
} else {
read_data[id].event = RT_TOUCH_EVENT_NONE;
}
read_data[id].timestamp = rt_touch_get_ts();
//下面的这行可以删除
read_data[id].width = pre_w[id];
read_data[id].x_coordinate = pre_x[id];
read_data[id].y_coordinate = pre_y[id];
read_data[id].track_id = id;
pre_x[id] = -1; /* last point is none */
pre_y[id] = -1;
//下面的这行可以删除
pre_w[id] = -1;
}
/*
* 这个是移动和按下事件函数，修改函数明即可使用
* 如果定义上面的静态数组的时候没有定义pre_w则下面代码关于pre_w的要删除
* 包括函数传参里面的int16_t w也要删除
*/
static void gt911_touch_down(void *buf, int8_t id, int16_t x, int16_t y,
int16_t w)
{
read_data = (struct rt_touch_data *)buf;
if (s_tp_dowm[id] == 1) {
read_data[id].event = RT_TOUCH_EVENT_MOVE;
} else {
read_data[id].event = RT_TOUCH_EVENT_DOWN;
s_tp_dowm[id] = 1;
}
read_data[id].timestamp = rt_touch_get_ts();
//下面的这行可以删除
read_data[id].width = w;
read_data[id].x_coordinate = x;
read_data[id].y_coordinate = y;
read_data[id].track_id = id;
pre_x[id] = x; /* save last point */
pre_y[id] = y;
//下面的这行可以删除
pre_w[id] = w;
}
/*
* 这个读取坐标点数据的函数，必须实现
*/
static rt_size_t gt911_read_point(struct rt_touch_device *touch, void *buf,
rt_size_t read_num)
{
rt_uint8_t point_status = 0;
rt_uint8_t touch_num = 0;
rt_uint8_t write_buf[3];
rt_uint8_t cmd[2];
//要读取的数据的长度，一般是读取坐标数量*每一个坐标信息的buf长度+一些其他信息
rt_uint8_t read_buf[8 * GT911_MAX_TOUCH] = { 0 };
rt_uint8_t read_index;
int8_t read_id = 0;
int16_t input_x = 0;
int16_t input_y = 0;
int16_t input_w = 0;
//存储上一次触摸点个数
static rt_uint8_t pre_touch = 0;
//存储上一次坐标ID的数组
static int8_t pre_id[GT911_MAX_TOUCH] = { 0 };
//这里是对传参过来的buf清零，避免buf里面已有数据对坐标读取产生影响
rt_memset(buf, 0, sizeof(struct rt_touch_data) * read_num);
/* point status register */
cmd[0] = (rt_uint8_t)((GT911_READ_STATUS >> 8) & 0xFF);
cmd[1] = (rt_uint8_t)(GT911_READ_STATUS & 0xFF);
if (gt911_read_regs(>911_client, cmd, &point_status, 1) != RT_EOK) {
LOG_D("read point failed\n");
read_num = 0;
goto exit_;
}
if (point_status == 0) /* no data */
{
read_num = 0;
goto exit_;
}
if ((point_status & 0x80) == 0) /* data is not ready */
{
read_num = 0;
goto exit_;
}
//触摸点个数赋值
touch_num = point_status & 0x0f; /* get point num */
if (touch_num > GT911_MAX_TOUCH) /* point num is not correct */
{
read_num = 0;
goto exit_;
}
cmd[0] = (rt_uint8_t)((GT911_POINT1_REG >> 8) & 0xFF);
cmd[1] = (rt_uint8_t)(GT911_POINT1_REG & 0xFF);
//读取坐标数据
if (gt911_read_regs(>911_client, cmd, read_buf,
read_num * GT911_POINT_INFO_NUM) != RT_EOK) {
LOG_D("read point failed\n");
read_num = 0;
goto exit_;
}
/*
* 下面是对坐标事件的处理，一般可以直接照抄，更换一下信息即可
*/
if (pre_touch > touch_num) /* point up */
{
for (read_index = 0; read_index < pre_touch; read_index++) {
rt_uint8_t j;
for (j = 0; j < touch_num; j++) /* this time touch num */
{
//坐标ID这里是需要更换的，要按照规格书来赋值
read_id = read_buf[j * 8] & 0x0F;
if (pre_id[read_index] == read_id) /* this id is not free */
break;
if (j >= touch_num - 1) {
rt_uint8_t up_id;
up_id = pre_id[read_index];
gt911_touch_up(buf, up_id);
}
}
}
}
if (touch_num) /* point down */
{
rt_uint8_t off_set;
for (read_index = 0; read_index < touch_num; read_index++) {
//这个offset是一个坐标信息的偏移，8代表一个坐标要读取8个byte，具体是多少按照规格书来
off_set = read_index * 8;
//坐标ID这里是需要更换的，要按照规格书来赋值
read_id = read_buf[off_set] & 0x0f;
pre_id[read_index] = read_id;
//下面的xyw也是需要按照规格书重新组合buf
input_x =
read_buf[off_set + 1] | (read_buf[off_set + 2] << 8); /* x */
input_y =
read_buf[off_set + 3] | (read_buf[off_set + 4] << 8); /* y */
input_w =
read_buf[off_set + 5] | (read_buf[off_set + 6] << 8); /* size */
gt911_touch_down(buf, read_id, input_x, input_y, input_w);
}
} else if (pre_touch) {
for (read_index = 0; read_index < pre_touch; read_index++) {
gt911_touch_up(buf, pre_id[read_index]);
}
}
//将当前的触摸点个数赋值给pre_touch
pre_touch = touch_num;
exit_:
//这里是gt911特有的每次读取完数据要发送0x00完成同步，没有这个要求的不需要实现
write_buf[0] = (rt_uint8_t)((GT911_READ_STATUS >> 8) & 0xFF);
write_buf[1] = (rt_uint8_t)(GT911_READ_STATUS & 0xFF);
write_buf[2] = 0x00;
gt911_write_reg(>911_client, write_buf, 3);
//返回触摸点个数
return read_num;
}
/*
* TP的控制函数，一般来说只需要实现RT_TOUCH_CTRL_GET_INFO，其他的可以不管
*/
static rt_err_t gt911_control(struct rt_touch_device *touch, int cmd, void *arg)
{
if (cmd == RT_TOUCH_CTRL_GET_ID) {
return gt911_get_product_id(>911_client, arg, 6);
}
if (cmd == RT_TOUCH_CTRL_GET_INFO) {
return gt911_get_info(>911_client, arg);
}
rt_uint8_t buf[4];
rt_uint8_t i = 0;
rt_uint8_t *config;
config =
(rt_uint8_t *)rt_calloc(1, sizeof(GT911_CFG_TBL) + GT911_REGITER_LEN);
if (config == RT_NULL) {
LOG_D("malloc config memory failed\n");
return -RT_ERROR;
}
config[0] = (rt_uint8_t)((GT911_CONFIG_REG >> 8) & 0xFF);
config[1] = (rt_uint8_t)(GT911_CONFIG_REG & 0xFF);
memcpy(&config[2], GT911_CFG_TBL, sizeof(GT911_CFG_TBL));
switch (cmd) {
case RT_TOUCH_CTRL_SET_X_RANGE: {
rt_uint16_t x_range;
x_range = *(rt_uint16_t *)arg;
config[4] = (rt_uint8_t)(x_range >> 8);
config[3] = (rt_uint8_t)(x_range & 0xff);
GT911_CFG_TBL[2] = config[4];
GT911_CFG_TBL[1] = config[3];
break;
}
case RT_TOUCH_CTRL_SET_Y_RANGE: {
rt_uint16_t y_range;
y_range = *(rt_uint16_t *)arg;
config[6] = (rt_uint8_t)(y_range >> 8);
config[5] = (rt_uint8_t)(y_range & 0xff);
GT911_CFG_TBL[4] = config[6];
GT911_CFG_TBL[3] = config[5];
break;
}
case RT_TOUCH_CTRL_SET_X_TO_Y: {
config[8] ^= (1 << 3);
break;
}
case RT_TOUCH_CTRL_SET_MODE: {
rt_uint16_t trig_type;
trig_type = *(rt_uint16_t *)arg;
switch (trig_type) {
case RT_DEVICE_FLAG_INT_RX:
config[8] &= 0xFC;
break;
case RT_DEVICE_FLAG_RDONLY:
config[8] &= 0xFC;
config[8] |= 0x02;
break;
default:
break;
}
break;
}
default: {
break;
}
}
if (gt911_write_reg(>911_client, config,
sizeof(GT911_CFG_TBL) + GT911_ADDR_LEN) != RT_EOK) {
LOG_D("send config failed");
return -1;
}
buf[0] = (rt_uint8_t)((GT911_CHECK_SUM >> 8) & 0xFF);
buf[1] = (rt_uint8_t)(GT911_CHECK_SUM & 0xFF);
buf[2] = 0;
for (i = GT911_ADDR_LEN; i < sizeof(GT911_CFG_TBL) + GT911_ADDR_LEN; i++) {
buf[GT911_ADDR_LEN] += config[i];
}
buf[2] = (~buf[2]) + 1;
buf[3] = 1;
gt911_write_reg(>911_client, buf, 4);
rt_free(config);
return RT_EOK;
}
/*
* rt_touch_ops，主要是完成对读坐标和控制TP的函数注册
*/
static struct rt_touch_ops gt911_touch_ops = {
.touch_readpoint = gt911_read_point,
.touch_control = gt911_control,
};
/*
* 这个函数主要实现对TP的初始操作
*/
static int rt_hw_gt911_init(const char *name, struct rt_touch_config *cfg)
{
struct rt_touch_device *touch_device = RT_NULL;
touch_device =
(struct rt_touch_device *)rt_malloc(sizeof(struct rt_touch_device));
if (touch_device == RT_NULL) {
LOG_E("touch device malloc fail");
return -RT_ERROR;
}
rt_memset((void *)touch_device, 0, sizeof(struct rt_touch_device));
//这里是对TP一些上下电的操作，具体根据规格书来
/* hw init*/
// rst output 0
rt_pin_mode(*(rt_uint8_t *)cfg->user_data, PIN_MODE_OUTPUT);
rt_pin_write(*(rt_uint8_t *)cfg->user_data, PIN_LOW);
rt_thread_delay(10);
// irq output 0
rt_pin_mode(cfg->irq_pin.pin, PIN_MODE_OUTPUT);
rt_pin_write(cfg->irq_pin.pin, PIN_LOW);
rt_thread_delay(2);
// rst output 1
rt_pin_mode(*(rt_uint8_t *)cfg->user_data, PIN_MODE_OUTPUT);
rt_pin_write(*(rt_uint8_t *)cfg->user_data, PIN_HIGH);
rt_thread_delay(5);
// rst input
rt_pin_mode(*(rt_uint8_t *)cfg->user_data, PIN_MODE_INPUT);
//irq output 0
rt_pin_mode(cfg->irq_pin.pin, PIN_MODE_OUTPUT);
rt_pin_write(cfg->irq_pin.pin, PIN_LOW);
rt_thread_delay(50);
//最后必须要对IRQ引脚设置回输入模式，不然会影响中断信号的获取
rt_pin_mode(cfg->irq_pin.pin, PIN_MODE_INPUT);
gt911_client.bus =
(struct rt_i2c_bus_device *)rt_device_find(cfg->dev_name);
if (gt911_client.bus == RT_NULL) {
LOG_E("Can't find %s device", cfg->dev_name);
return -RT_ERROR;
}
//打开设备中断模式用RT_DEVICE_FLAG_RDWR
if (rt_device_open((rt_device_t)gt911_client.bus, RT_DEVICE_FLAG_RDWR) !=
RT_EOK) {
LOG_E("open %s device failed", cfg->dev_name);
return -RT_ERROR;
}
//从机设备地址赋值
gt911_client.client_addr = GT911_ADDRESS_HIGH;
/* register touch device */
//赋值芯片的型号和类型
touch_device->info.type = RT_TOUCH_TYPE_CAPACITANCE;
touch_device->info.vendor = RT_TOUCH_VENDOR_GT;
rt_memcpy(&touch_device->config, cfg, sizeof(struct rt_touch_config));
touch_device->ops = >911_touch_ops;
if (RT_EOK != rt_hw_touch_register(touch_device, name, RT_DEVICE_FLAG_INT_RX, RT_NULL)) {
LOG_E("touch device gt911 init failed !!!");
return -RT_ERROR;
}
LOG_I("touch device gt911 init success");
return RT_EOK;
}
/*
* 这个函数主要实现对GPIO的初始化，这个函数只需修改函数名即可复用
*/
static int rt_gt911_gpio_cfg()
{
unsigned int g, p;
long pin;
// AIC_TOUCH_PANEL_RST_PIN是公用参数里面的复位引脚
pin = drv_pin_get(AIC_TOUCH_PANEL_RST_PIN);
g = GPIO_GROUP(pin);
p = GPIO_GROUP_PIN(pin);
hal_gpio_direction_input(g, p);
// AIC_TOUCH_PANEL_INT_PIN是公用参数里面的中断引脚
pin = drv_pin_get(AIC_TOUCH_PANEL_INT_PIN);
g = GPIO_GROUP(pin);
p = GPIO_GROUP_PIN(pin);
hal_gpio_direction_input(g, p);
hal_gpio_set_irq_mode(g, p, 0);
return 0;
}
/*
* 这个函数主要注册整个设备，改个名字即可复用
*/
static int rt_hw_gt911_port(void)
{
struct rt_touch_config cfg;
rt_uint8_t rst_pin;
rt_gt911_gpio_cfg();
rst_pin = drv_pin_get(AIC_TOUCH_PANEL_RST_PIN);
cfg.dev_name = AIC_TOUCH_PANEL_I2C_CHAN;
cfg.irq_pin.pin = drv_pin_get(AIC_TOUCH_PANEL_INT_PIN);
cfg.irq_pin.mode = PIN_MODE_INPUT;
cfg.user_data = &rst_pin;
#ifdef AIC_PM_DEMO
rt_pm_set_pin_wakeup_source(cfg.irq_pin.pin);
#endif
// AIC_TOUCH_PANEL_NAME这个是公用参数里面设备名字，也可以直接复用
rt_hw_gt911_init(AIC_TOUCH_PANEL_NAME, &cfg);
return 0;
}
//通过宏 ``INIT_DEVICE_EXPORT``，驱动在系统启动时自动加载,即可轻松适配不同型号的触控芯片
INIT_DEVICE_EXPORT(rt_hw_gt911_port);