David Smart / RA8875 Featured

Library to control a Graphics TFT connected to 4-wire SPI - revised for the Raio RA8875 Display Controller.

Dependents:   FRDM_RA8875_mPaint RA8875_Demo RA8875_KeyPadDemo SignalGenerator ... more

Fork of SPI_TFT by Peter Drescher

See Components - RA8875 Based Display

Enhanced touch-screen support - where it previous supported both the Resistive Touch and Capacitive Touch based on the FT5206 Touch Controller, now it also has support for the GSL1680 Touch Controller.

Offline Help Manual (Windows chm)

/media/uploads/WiredHome/ra8875.zip.bin (download, rename to .zip and unzip)

RA8875_Touch_FT5206.cpp

Committer:
WiredHome
Date:
2020-03-29
Revision:
201:0b25d24d9bda
Parent:
197:853d08e2fb53
Child:
202:a22cbc04f332

File content as of revision 201:0b25d24d9bda:



#include "RA8875.h"

//#define DEBUG "RAFT" // RA8875 FT5206
// ...
// INFO("Stuff to show %d", var); // new-line is automatically appended
//
#if (defined(DEBUG) && !defined(TARGET_LPC11U24))
#define INFO(x, ...) std::printf("[INF %s %4d] " x "\r\n", DEBUG, __LINE__, ##__VA_ARGS__);
#define WARN(x, ...) std::printf("[WRN %s %4d] " x "\r\n", DEBUG, __LINE__, ##__VA_ARGS__);
#define ERR(x, ...)  std::printf("[ERR %s %4d] " x "\r\n", DEBUG, __LINE__, ##__VA_ARGS__);
static void HexDump(const char * title, const uint8_t * p, int count)
{
    int i;
    char buf[100] = "0000: ";

    if (*title)
        INFO("%s", title);
    for (i=0; i<count; ) {
        sprintf(buf + strlen(buf), "%02X ", *(p+i));
        if ((++i & 0x0F) == 0x00) {
            INFO("%s", buf);
            if (i < count)
                sprintf(buf, "%04X: ", i);
            else
                buf[0] = '\0';
        }
    }
    if (strlen(buf))
        INFO("%s", buf);
}
#else
#define INFO(x, ...)
#define WARN(x, ...)
#define ERR(x, ...)
#define HexDump(a, b, c)
#endif



// Translate from FT5206 Event Flag to Touch Code to API-match the
// alternate resistive touch screen driver common in the RA8875
// displays.
static const TouchCode_t FT5206_EventFlagToTouchCode[4] = {
    touch,      // 00b Put Down
    release,    // 01b Put Up
    held,       // 10b Contact
    no_touch    // 11b Reserved
};


RetCode_t RA8875::FT5206_Init() {
    const char data[] = {FT5206_DEVICE_MODE, 0};
    //const char data[] = {0xC3, 0x55, 0x11, 0x33, 0xAA};

    #ifdef DEBUG
    int count = 0;
    for (int address=0; address<256; address+=2) {
        if (!m_i2c->write(address, NULL, 0)) { // 0 returned is ok
            INFO("I2C address 0x%02X", address);
            count++;
        }
    }
    INFO("%d devices found", count);
    #endif
   

    INFO("FT5206_Init: Addr %02X", m_addr);
    HexDump("FT5206 Init", (uint8_t *)data, sizeof(data)/sizeof(data[0]));
    int err = m_i2c->write(m_addr, data, sizeof(data)/sizeof(data[0]), true);
    if (err) {
        ERR("  result: %d", err);
    }
    return noerror;
}

uint8_t RA8875::FT5206_TouchPositions(void) {
    uint8_t valXH;
    uint8_t valYH;

    INFO("FT5206_TouchPositions()");
    numberOfTouchPoints = FT5206_ReadRegU8(FT5206_TD_STATUS) & 0xF;
    INFO("  numOfTouchPoints %d", numberOfTouchPoints);
    gesture = FT5206_ReadRegU8(FT5206_GEST_ID);
    INFO("  gesture %d", gesture);
   

    valXH  = FT5206_ReadRegU8(FT5206_TOUCH5_XH);
    valYH  = FT5206_ReadRegU8(FT5206_TOUCH5_YH);
    touchInfo[4].touchCode = FT5206_EventFlagToTouchCode[valXH >> 6];
    INFO("  touchID %d", touchInfo[4].touchCode);
    touchInfo[4].touchID   = (valYH >> 4);
    touchInfo[4].coordinates.x = (valXH & 0x0f)*256 + FT5206_ReadRegU8(FT5206_TOUCH5_XL);
    touchInfo[4].coordinates.y = (valYH & 0x0f)*256 + FT5206_ReadRegU8(FT5206_TOUCH5_YL);
   

    valXH  = FT5206_ReadRegU8(FT5206_TOUCH4_XH);
    valYH  = FT5206_ReadRegU8(FT5206_TOUCH4_YH);
    touchInfo[3].touchCode = FT5206_EventFlagToTouchCode[valXH >> 6];
    INFO("  touchID %d", touchInfo[3].touchCode);
    touchInfo[3].touchID   = (valYH >> 4);
    touchInfo[3].coordinates.x = (valXH & 0x0f)*256 + FT5206_ReadRegU8(FT5206_TOUCH4_XL);
    touchInfo[3].coordinates.y = (valYH & 0x0f)*256 + FT5206_ReadRegU8(FT5206_TOUCH4_YL);
   

    valXH  = FT5206_ReadRegU8(FT5206_TOUCH3_XH);
    valYH  = FT5206_ReadRegU8(FT5206_TOUCH3_YH);
    touchInfo[2].touchCode = FT5206_EventFlagToTouchCode[valXH >> 6];
    INFO("  touchID %d", touchInfo[2].touchCode);
    touchInfo[2].touchID   = (valYH >> 4);
    touchInfo[2].coordinates.x = (valXH & 0x0f)*256 + FT5206_ReadRegU8(FT5206_TOUCH3_XL);
    touchInfo[2].coordinates.y = (valYH & 0x0f)*256 + FT5206_ReadRegU8(FT5206_TOUCH3_YL);
   

    valXH  = FT5206_ReadRegU8(FT5206_TOUCH2_XH);
    valYH  = FT5206_ReadRegU8(FT5206_TOUCH2_YH);
    touchInfo[1].touchCode = FT5206_EventFlagToTouchCode[valXH >> 6];
    INFO("  touchID %d", touchInfo[1].touchCode);
    touchInfo[1].touchID   = (valYH >> 4);
    touchInfo[1].coordinates.x = (valXH & 0x0f)*256 + FT5206_ReadRegU8(FT5206_TOUCH2_XL);
    touchInfo[1].coordinates.y = (valYH & 0x0f)*256 + FT5206_ReadRegU8(FT5206_TOUCH2_YL);
   

    valXH  = FT5206_ReadRegU8(FT5206_TOUCH1_XH);
    valYH  = FT5206_ReadRegU8(FT5206_TOUCH1_YH);
    touchInfo[0].touchCode = FT5206_EventFlagToTouchCode[valXH >> 6];
    INFO("  touchID %d", touchInfo[0].touchCode);
    touchInfo[0].touchID   = (valYH >> 4);
    touchInfo[0].coordinates.x = (valXH & 0x0f)*256 + FT5206_ReadRegU8(FT5206_TOUCH1_XL);
    touchInfo[0].coordinates.y = (valYH & 0x0f)*256 + FT5206_ReadRegU8(FT5206_TOUCH1_YL);

    return numberOfTouchPoints;
}