RAiO RA8806 - Display Future

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Version 1.3 RA8806 Two Layers Character/Graphic LCD Controller Please refer to the following flow chart and the setting examples for applying Interrupt Mode: (1) Flowchart: Start Enable Touch Panel ( REG[C0h] B7 = 1 ) Set Manual Mode ( REG[C4h] B7 = 1 ) Enable TP INT Mask ( REG[0Fh] B4 = 1 ) ISR Check INT Status ( REG[0Fh] B0 = ? ) 1 Latch X Data ( REG[C4h][1:0] = 10 ) 0 Wait for TP event Mode ( REG[C4h][1:0] = 01 ) Ext. INT Event Latch Y Data ( REG[C4h][1:0] = 11 ) Read X, Y-axis ( Read REG[C1h], REG[C2h], REG[C3h] ) Other Functions Execute Function Clear TP INT Status ( REG[0Fh] B0 = 0 ) ISR Termination Figure 6-20 : Manual Mode Flowchart for Touch Screen RAiO TECHNOLOGY INC. 46/193 www.raio.com.tw
Version 1.3 RA8806 Two Layers Character/Graphic LCD Controller (2) Program Example: Unsigned char X1,X2,Y1,Y2; Touch_Panel_Enable ( ); // Set TPCR1 Bit-7 to 1 TP_Manual_Enable ( ); // Set TPCR2 Bit 7 to 1 TP_INT_Mask_Enable ( ); // Set INTR Bit-4 to 1 Switch_Wait_TP_Event( ); // Set TPCR2[1:0] to 01b : : Execute other function // Jump to ISR when interrupt : : Int EXT_INT_Service_Routine // ISR entry { LCD_CmdWrite ( INTR ); // Check INT status INT_Sta = LCD_DataRead ( ); If ( INT_Sta & 0x01) // Check If TP interrupt { Switch_Latch_X_data( ); // Set TPCR2[1:0] to 10b Delay_Time( ); // Delay enough time for X data stable Switch_Latch_Y_data( ); // Set TPCR2[1:0] to 11b Delay_Time( ); // Delay enough time for Y data stable LCD_CmdWrite(TPXR); X1 = LCD_DataRead( ); // MSB of X LCD_CmdWrite(TPYR); Y1 = LCD_DataRead( ); // MSB of Y LCD_CmdWrite(TPZR); X2 = LCD_DataRead( ) & 0x03; // LSB two Bits of X LCD_CmdWrite(TPZR); Y2 = LCD_DataRead( ) & 0x0C; // LSB two Bits of Y : : Execute corresponding function : : LCD_CmdWrite ( INTR ); // Clear Touch Panel status temp = LCD_DataRead ( ) & 0xfe; LCD_CmdWrite ( INTR ); LCD_DataWrite ( temp ); } Else if (INT_Sta & 0x02) // Check if Key-Scan interrupt { : : } Else if (INT_Sta & 0x04) // Check if Wakeup interrupt { : : } } RAiO TECHNOLOGY INC. 47/193 www.raio.com.tw
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RAiO RA8806 - Display Future

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