能写是stm32平台一个5寸GT911驱动代码

以下是基于STM32平台的5寸GT911触摸屏驱动代码，需要先初始化I2C总线：

#include "stm32f4xx.h"

#define GT911_ADDR 0xBA

#define GT911_CFG_NUM 0x8047

void GT911_Init(void)
{
    uint8_t cfg_data[2];
    cfg_data[0] = GT911_CFG_NUM >> 8;
    cfg_data[1] = GT911_CFG_NUM & 0xFF;

    // Send config command
    I2C_StartTransmission(I2C1, GT911_ADDR, I2C_Direction_Transmitter);
    I2C_WriteData(I2C1, cfg_data[0]);
    I2C_WriteData(I2C1, cfg_data[1]);
    I2C_Stop(I2C1);

    // Delay for GT911 to process the config command
    Delay_us(100);

    // Read config data from GT911
    I2C_StartTransmission(I2C1, GT911_ADDR, I2C_Direction_Transmitter);
    I2C_WriteData(I2C1, 0x80);
    I2C_Stop(I2C1);
    I2C_StartTransmission(I2C1, GT911_ADDR, I2C_Direction_Receiver);
    uint8_t data[14];
    for (int i = 0; i < 14; i++) {
        data[i] = I2C_ReadData(I2C1, i == 13 ? I2C_NACK : I2C_ACK);
    }
    I2C_Stop(I2C1);

    // Parse config data and configure GT911
    uint16_t threshold = ((uint16_t)data[1] << 8) | data[0];
    uint8_t touch_cfg = data[3];
    uint16_t touch_panel_x = ((uint16_t)data[6] << 8) | data[5];
    uint16_t touch_panel_y = ((uint16_t)data[8] << 8) | data[7];
    uint16_t touch_screen_x = ((uint16_t)data[10] << 8) | data[9];
    uint16_t touch_screen_y = ((uint16_t)data[12] << 8) | data[11];

    uint8_t cfg_buf[5];
    cfg_buf[0] = 0x41;
    cfg_buf[1] = 0x00;
    cfg_buf[2] = 0x01;
    cfg_buf[3] = 0x5A;
    cfg_buf[4] = 0x5A;

    I2C_StartTransmission(I2C1, GT911_ADDR, I2C_Direction_Transmitter);
    I2C_WriteData(I2C1, 0x8040);
    I2C_WriteData(I2C1, 0x02);
    I2C_Stop(I2C1);

    I2C_StartTransmission(I2C1, GT911_ADDR, I2C_Direction_Transmitter);
    I2C_WriteData(I2C1, 0x8046);
    I2C_WriteData(I2C1, 0x01);
    I2C_Stop(I2C1);

    I2C_StartTransmission(I2C1, GT911_ADDR, I2C_Direction_Transmitter);
    I2C_WriteData(I2C1, 0x8047);
    I2C_WriteData(I2C1, threshold & 0xFF);
    I2C_Stop(I2C1);

    I2C_StartTransmission(I2C1, GT911_ADDR, I2C_Direction_Transmitter);
    I2C_WriteData(I2C1, 0x8048);
    I2C_WriteData(I2C1, threshold >> 8);
    I2C_Stop(I2C1);

    I2C_StartTransmission(I2C1, GT911_ADDR, I2C_Direction_Transmitter);
    I2C_WriteData(I2C1, 0x804D);
    I2C_WriteData(I2C1, touch_cfg);
    I2C_Stop(I2C1);

    cfg_buf[1] = touch_panel_x >> 8;
    cfg_buf[2] = touch_panel_x & 0xFF;
    cfg_buf[3] = touch_panel_y >> 8;
    cfg_buf[4] = touch_panel_y & 0xFF;
    GT911_WriteConfig(0x8150, cfg_buf, 5);

    cfg_buf[1] = touch_screen_x >> 8;
    cfg_buf[2] = touch_screen_x & 0xFF;
    cfg_buf[3] = touch_screen_y >> 8;
    cfg_buf[4] = touch_screen_y & 0xFF;
    GT911_WriteConfig(0x8140, cfg_buf, 5);

    I2C_StartTransmission(I2C1, GT911_ADDR, I2C_Direction_Transmitter);
    I2C_WriteData(I2C1, 0x8040);
    I2C_WriteData(I2C1, 0x01);
    I2C_Stop(I2C1);
}

void GT911_WriteConfig(uint16_t addr, uint8_t *buf, uint8_t len)
{
    I2C_StartTransmission(I2C1, GT911_ADDR, I2C_Direction_Transmitter);
    I2C_WriteData(I2C1, addr >> 8);
    I2C_WriteData(I2C1, addr & 0xFF);
    for (int i = 0; i < len; i++) {
        I2C_WriteData(I2C1, buf[i]);
    }
    I2C_Stop(I2C1);
}

这段代码中使用了`GT911_WriteConfig`函数来写入配置数据，需要定义如下的I2C读写函数：

void I2C_StartTransmission(I2C_TypeDef *I2Cx, uint8_t address, uint8_t direction)
{
    while (I2C_GetFlagStatus(I2Cx, I2C_FLAG_BUSY));
    I2C_GenerateSTART(I2Cx, ENABLE);

    while (!I2C_CheckEvent(I2Cx, I2C_EVENT_MASTER_MODE_SELECT));

    I2C_Send7bitAddress(I2Cx, address, direction);

    if (direction == I2C_Direction_Transmitter) {
        while (!I2C_CheckEvent(I2Cx, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED));
    } else if (direction == I2C_Direction_Receiver) {
        while (!I2C_CheckEvent(I2Cx, I2C_EVENT_MASTER_RECEIVER_MODE_SELECTED));
    }
}

void I2C_WriteData(I2C_TypeDef *I2Cx, uint8_t data)
{
    I2C_SendData(I2Cx, data);
    while (!I2C_CheckEvent(I2Cx, I2C_EVENT_MASTER_BYTE_TRANSMITTED));
}

uint8_t I2C_ReadData(I2C_TypeDef *I2Cx, uint8_t ack)
{
    if (ack == I2C_ACK) {
        I2C_AcknowledgeConfig(I2Cx, ENABLE);
    } else {
        I2C_AcknowledgeConfig(I2Cx, DISABLE);
    }

    while (!I2C_CheckEvent(I2Cx, I2C_EVENT_MASTER_BYTE_RECEIVED));

    uint8_t data = I2C_ReceiveData(I2Cx);

    return data;
}

void I2C_Stop(I2C_TypeDef *I2Cx)
{
    I2C_GenerateSTOP(I2Cx, ENABLE);
    while (I2C_GetFlagStatus(I2Cx, I2C_FLAG_STOPF));
}

其中，`I2C_StartTransmission`函数用于启动I2C总线传输，`I2C_WriteData`函数用于写入数据，`I2C_ReadData`函数用于读取数据，`I2C_Stop`函数用于停止I2C总线传输。需要根据实际情况更改函数名称和参数。