RA8875_Touch_FT5206.cpp

00001 
00002 
00003 #include "RA8875.h"
00004 
00005 //#define DEBUG "RAFT" // RA8875 FT5206
00006 // ...
00007 // INFO("Stuff to show %d", var); // new-line is automatically appended
00008 //
00009 #if (defined(DEBUG) && !defined(TARGET_LPC11U24))
00010 #define INFO(x, ...) std::printf("[INF %s %4d] " x "\r\n", DEBUG, __LINE__, ##__VA_ARGS__);
00011 #define WARN(x, ...) std::printf("[WRN %s %4d] " x "\r\n", DEBUG, __LINE__, ##__VA_ARGS__);
00012 #define ERR(x, ...)  std::printf("[ERR %s %4d] " x "\r\n", DEBUG, __LINE__, ##__VA_ARGS__);
00013 static void HexDump(const char * title, const uint8_t * p, int count)
00014 {
00015     int i;
00016     char buf[100] = "0000: ";
00017 
00018     if (*title)
00019         INFO("%s", title);
00020     for (i=0; i<count; ) {
00021         sprintf(buf + strlen(buf), "%02X ", *(p+i));
00022         if ((++i & 0x0F) == 0x00) {
00023             INFO("%s", buf);
00024             if (i < count)
00025                 sprintf(buf, "%04X: ", i);
00026             else
00027                 buf[0] = '\0';
00028         }
00029     }
00030     if (strlen(buf))
00031         INFO("%s", buf);
00032 }
00033 #else
00034 #define INFO(x, ...)
00035 #define WARN(x, ...)
00036 #define ERR(x, ...)
00037 #define HexDump(a, b, c)
00038 #endif
00039 
00040 
00041 // Translate from FT5206 Event Flag to Touch Code to API-match the
00042 // alternate resistive touch screen driver common in the RA8875
00043 // displays.
00044 static const TouchCode_t FT5206_EventFlagToTouchCode[4] = {
00045     touch,      // 00b Put Down
00046     release,    // 01b Put Up
00047     held,       // 10b Contact
00048     no_touch    // 11b Reserved
00049 };
00050 
00051 
00052 RetCode_t RA8875::FT5206_Init() {
00053     const char data[] = {FT5206_DEVICE_MODE, 0};
00054     //const char data[] = {0xC3, 0x55, 0x11, 0x33, 0xAA};
00055 
00056     #ifdef DEBUG
00057     int count = 0;
00058     for (int address=0; address<256; address+=2) {
00059         if (!m_i2c->write(address, NULL, 0)) { // 0 returned is ok
00060             INFO("I2C address 0x%02X", address);
00061             count++;
00062         }
00063     }
00064     INFO("%d devices found", count);
00065     #endif
00066    
00067 
00068     INFO("FT5206_Init: Addr %02X", m_addr);
00069     HexDump("FT5206 Init", (uint8_t *)data, sizeof(data)/sizeof(data[0]));
00070     int err = m_i2c->write(m_addr, data, sizeof(data)/sizeof(data[0]), true);
00071     if (err) {
00072         ERR("  result: %d", err);
00073     }
00074     return noerror;
00075 }
00076 
00077 uint8_t RA8875::FT5206_TouchPositions(void) {
00078     uint8_t valXH;
00079     uint8_t valYH;
00080 
00081     INFO("FT5206_TouchPositions()");
00082     numberOfTouchPoints = FT5206_ReadRegU8(FT5206_TD_STATUS) & 0xF;
00083     INFO("  numOfTouchPoints %d", numberOfTouchPoints);
00084     gesture = FT5206_ReadRegU8(FT5206_GEST_ID);
00085     INFO("  gesture %d", gesture);
00086    
00087 
00088     valXH  = FT5206_ReadRegU8(FT5206_TOUCH5_XH);
00089     valYH  = FT5206_ReadRegU8(FT5206_TOUCH5_YH);
00090     touchInfo[4].touchCode = FT5206_EventFlagToTouchCode[valXH >> 6];
00091     INFO("  touchCode %d", touchInfo[4].touchCode);
00092     touchInfo[4].touchID   = (valYH >> 4);
00093     touchInfo[4].coordinates = TranslateOrientation(
00094         (valXH & 0x0f)*256 + FT5206_ReadRegU8(FT5206_TOUCH5_XL),
00095         (valYH & 0x0f)*256 + FT5206_ReadRegU8(FT5206_TOUCH5_YL) );
00096    
00097 
00098     valXH  = FT5206_ReadRegU8(FT5206_TOUCH4_XH);
00099     valYH  = FT5206_ReadRegU8(FT5206_TOUCH4_YH);
00100     touchInfo[3].touchCode = FT5206_EventFlagToTouchCode[valXH >> 6];
00101     INFO("  touchCode %d", touchInfo[3].touchCode);
00102     touchInfo[3].touchID   = (valYH >> 4);
00103     touchInfo[3].coordinates = TranslateOrientation(
00104         (valXH & 0x0f)*256 + FT5206_ReadRegU8(FT5206_TOUCH4_XL),
00105         (valYH & 0x0f)*256 + FT5206_ReadRegU8(FT5206_TOUCH4_YL) );
00106 
00107 
00108     valXH  = FT5206_ReadRegU8(FT5206_TOUCH3_XH);
00109     valYH  = FT5206_ReadRegU8(FT5206_TOUCH3_YH);
00110     touchInfo[2].touchCode = FT5206_EventFlagToTouchCode[valXH >> 6];
00111     INFO("  touchCode %d", touchInfo[2].touchCode);
00112     touchInfo[2].touchID   = (valYH >> 4);
00113     touchInfo[2].coordinates = TranslateOrientation(
00114         (valXH & 0x0f)*256 + FT5206_ReadRegU8(FT5206_TOUCH3_XL),
00115         (valYH & 0x0f)*256 + FT5206_ReadRegU8(FT5206_TOUCH3_YL) );
00116    
00117 
00118     valXH  = FT5206_ReadRegU8(FT5206_TOUCH2_XH);
00119     valYH  = FT5206_ReadRegU8(FT5206_TOUCH2_YH);
00120     touchInfo[1].touchCode = FT5206_EventFlagToTouchCode[valXH >> 6];
00121     INFO("  touchCode %d", touchInfo[1].touchCode);
00122     touchInfo[1].touchID   = (valYH >> 4);
00123     touchInfo[1].coordinates = TranslateOrientation(
00124         (valXH & 0x0f)*256 + FT5206_ReadRegU8(FT5206_TOUCH2_XL),
00125         (valYH & 0x0f)*256 + FT5206_ReadRegU8(FT5206_TOUCH2_YL) );
00126    
00127 
00128     valXH  = FT5206_ReadRegU8(FT5206_TOUCH1_XH);
00129     valYH  = FT5206_ReadRegU8(FT5206_TOUCH1_YH);
00130     touchInfo[0].touchCode = FT5206_EventFlagToTouchCode[valXH >> 6];
00131     INFO("  touchCode %d", touchInfo[0].touchCode);
00132     touchInfo[0].touchID   = (valYH >> 4);
00133     touchInfo[0].coordinates = TranslateOrientation(
00134         (valXH & 0x0f)*256 + FT5206_ReadRegU8(FT5206_TOUCH1_XL),
00135         (valYH & 0x0f)*256 + FT5206_ReadRegU8(FT5206_TOUCH1_YL) );
00136 
00137     return numberOfTouchPoints;
00138 }