picoclock/CST816S.c at main · dawigit/picoclock · GitHub

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/*****************************************************************************
 * | File      	:   CST816S.c
 * | Author      :   Waveshare team
 * | Function    :   Hardware underlying interface
 * | Info        :
 *                Used to shield the underlying layers of each master
 *                and enhance portability
 *----------------
 * |	This version:   V1.0
 * | Date        :   2022-12-02
 * | Info        :   Basic version
 *
 ******************************************************************************/
#include "CST816S.h"
CST816S Touch_CTS816;

void CST816S_I2C_Write(uint8_t reg, uint8_t value)
{
    uint8_t data[2] = {reg, value};
    i2c_write_blocking(I2C_PORT, CST816_ADDR, data, 2, false);
}
uint8_t CST816S_I2C_Read(uint8_t reg)
{
    uint8_t buf;
    i2c_write_blocking(I2C_PORT,CST816_ADDR,&reg,1,true);
    i2c_read_blocking(I2C_PORT,CST816_ADDR,&buf,1,false);
    return buf;
}

uint8_t CST816S_WhoAmI()
{
    //printf("whoami");
    uint8_t cid = CST816S_I2C_Read(CST816_ChipID);
    //printf(" = %02x\n",cid);
    return ( cid == 0xB5);
}

void CST816S_Reset()
{
    gpio_put(Touch_RST_PIN, 0);
    sleep_ms(120);
    gpio_put(Touch_RST_PIN, 1);
    sleep_ms(120);
}

uint8_t CST816S_Read_Revision()
{
    return CST816S_I2C_Read(CST816_FwVersion);
}

void CST816S_Wake_up()
{
    gpio_put(Touch_RST_PIN, 0);
    sleep_ms(10);
    gpio_put(Touch_RST_PIN, 1);
    sleep_ms(50);
    CST816S_I2C_Write(CST816_DisAutoSleep, 0x01);
}

void CST816S_Stop_Sleep()
{
    CST816S_I2C_Write(CST816_DisAutoSleep, 0x01);
}

void CST816S_Set_Mode(uint8_t mode)
{
    if (mode == CST816S_Point_Mode)
    {
        //
        CST816S_I2C_Write(CST816_IrqCtl, 0x41);
    }
    else if (mode == CST816S_Gesture_Mode)
    {
        CST816S_I2C_Write(CST816_IrqCtl, 0X11);
        CST816S_I2C_Write(CST816_MotionMask, 0x01);
    }
    else
    {
        CST816S_I2C_Write(CST816_IrqCtl, 0X71);
    }

}


uint8_t CST816S_init(uint8_t mode)
{
    uint8_t bRet, Rev;
    CST816S_Reset();
    //printf("CST816T reset done\n");
    bRet = CST816S_WhoAmI();
    if (bRet)
    {
        //printf("Success:Detected CST816T.\r\n");
        Rev = CST816S_Read_Revision();
        //printf("CST816T Revision = %d\r\n", Rev);
        CST816S_Stop_Sleep();
    }
    else
    {
        printf("Error: Not Detected CST816T.\r\n");
        return false;
    }

    CST816S_Set_Mode(mode);
    Touch_CTS816.x_point = 0;
    Touch_CTS816.y_point = 0;
    CST816S_I2C_Write(CST816_IrqPluseWidth, 0x01);
    CST816S_I2C_Write(CST816_NorScanPer, 0x01);

    Touch_CTS816.mode = mode;

    return true;
}

CST816S CST816S_Get_Point()
{
    uint8_t x_point_h, x_point_l, y_point_h, y_point_l;
    // CST816S_Wake_up();

    x_point_h = CST816S_I2C_Read(CST816_XposH);
    x_point_l = CST816S_I2C_Read(CST816_XposL);
    y_point_h = CST816S_I2C_Read(CST816_YposH);
    y_point_l = CST816S_I2C_Read(CST816_YposL);

    Touch_CTS816.x_point = ((x_point_h & 0x0f) << 8) + x_point_l;
    Touch_CTS816.y_point = ((y_point_h & 0x0f) << 8) + y_point_l;

    return Touch_CTS816;
}
uint8_t CST816S_Get_Gesture(void)
{
    uint8_t gesture;
    gesture=CST816S_I2C_Read(CST816_GestureID);
    return gesture;
}