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[0x81A9] GT911_Status_Bak

Backup of GT911_Status. It is suggested that the host reads the GT911_Status and GT911_Status_Bak

simultaneously. Only when these two values are the same, can the status be considered valid, thus reducing

the interference to I2C bus which causes data errors.

3.5 Hotknot status registers

Addr

Access

bit7

bit6

bit5

bit4

bit3

bit2

bit1

bit0

0xAB10

SendStatus: Send status register

0xAB11

RevStatus: Receive status register

0xAB12

SendStatusBak: Send status register backup

0xAB13

RevStatusBak: Receive status register backup

…

NC (11 bytes reserved)

0xAB1F

R/W

When there is work needs to be handled by the host, GT911 will write

0xAA to this address and notify the host to handle the work via INT. After

the work is finished, the host sends another command other than 0xAA.

And GT911 will implement the command. Otherwise, it will wait for 2.5s.

Supplementary description on some registers:

The data read from this area is valid only when GT911 operates in Receive Mode or Send Mode, that is

to say, only when GT911_Status is 0xAA or 0xBB.

[0xAB10] SendStatus

This register indicates the Send status in Send Mode.

0x01: indicates GT911 is in idle state. When a data frame is transmitted successfully and there is no

data needs to be sent, GT911 will automatically switch to Receive Mode and perform Leave Detection. The

host sends the outgoing data to the hotknot Transmit Buffer in this state.

0x02: indicates GT911 is transmitting data. The host cannot modify the data in the Transmit Buffer in

this state.

0x03: all data in Transmit Buffer is transmitted successfully. GT911 notifies the host to process the data

via INT. After reading the status, the host writes a number other than 0xAA to 0xAB1F, then GT911 will

automatically switch to idle state and enter Receive Mode and perform Leave Detection.

0x04: The data sent by the host to the Transmit Buffer fails to pass the verification (incorrect or byte

length does not match). GT911 notifies the host to handle via INT. After reading the status, the host writes a

number other than 0xAA to 0xAB1F, and then resends the previously-issued data again.

Содержание GT911

Страница 1: ...ology Co Ltd hereafter referred to as GOODIX makes no representation or guarantee for this information either expressed or implied written or verbal statutory or otherwise including but not limited to...

Страница 2: ...Value 23 4 1 Power On Timing of GT911 23 4 2 I2 C Address Selection during Power on or Reset Process 24 4 3 Send Configuration after Power on 25 4 4 Register Value Modification 25 5 Coordinates Readi...

Страница 3: ...e edges of SCL and SDA are steep enough GT911 invariably serves as slave device in communication and its I2 C device address consists of 7 device address bits and 1 Read Write control bit The high 7 b...

Страница 4: ...nication has to be resent 3 Register Map 3 1 Real time command Write only Addr Name bit7 bit6 bit5 bit4 bit3 bit2 bit1 bit0 0x8040 Command 0 Read coordinates status 1 Read diff data or raw data 2 Read...

Страница 5: ...ing edge 01 falling edge 02 Low level 03 High level 0x804E Module_ switch2 Reserved FirstFilte r_Dis Reserved Approch_ En HotKnot _En Touch_ Key 0x804F Shake_Count De jitter frequency when touch is be...

Страница 6: ...Multiplier Factor of drive frequency of Driver Group B GroupB_Frequence Clock Multiplier Factor Fundamental Frequency 0x8067 Pannel_ BitFreqL Fundamental Frequency of Driver Groups A and B 1526HZ Fund...

Страница 7: ...V Double ta p Swipe down 0x8077 Gesture_Refresh_R ate Report rate in Gesture mode period is 5 ms 0x8078 Gesture_Touch_ Level Touch threshold in Gesture mode 0x8079 NewGreenWake UpLevel Threshold for...

Страница 8: ...0x8082 Hopping_Sensor_G roup Sections for Hopping Frequency Noise Detection 4 sections recommended 0x8083 Hopping_seg1_Nor malize Seg1 Normalize coefficient sampling value N 128 Raw data 0x8084 Hoppi...

Страница 9: ...efficient of Key 2 0x809B Key_Sens KeySens_3 sensitivity coefficient of Key 3 KeySens_4 sensitivity coefficient of Key 4 0x809C Key_Restrain The key restrain interval after finger leaves screen unit 1...

Страница 10: ...ed 0x80B2 NC Reserved 0x80B3 Combine_Dis Distance for adjacent rectangles to be combined in Gesture mode Distance for adjacent rectangles to be combined 0x80B4 Split_Set Distance for a large area rect...

Страница 11: ...area is 15 32 480 original coordinates one Pitch consists of 512 original coordinates if the cutting exceeds one Pitch it is allowed to subtract one Pitch from the configuration 0x8070 Module_Switch3...

Страница 12: ...et value x4 then the optical frequency is selected and frequency hopping is enabled 0x809A 0x809B Key_Sens The sensitivity coefficient configuration of 4 independent touch keys can be configured to 0...

Страница 13: ...stance for adjacent rectangles to be combined in Gesture mode 0 to 15 configurable the distance for adjacent touch points to be combined is calculated as sqrt 2 Combin_Dis pitch For backward compatibi...

Страница 14: ...Reserved 0x814E R W buffer status large detect Proximity Valid HaveKey number of touch points 0x814F R track id is 32 indicates the signal is proximity sensing signal 0x8150 R PxyOk Reserved 0x8151 R...

Страница 15: ...8177 R track id 0x8178 R point 5 x coordinate low byte 0x8179 R point 5 x coordinate high byte 0x817A R point 5 y coordinate low byte 0x817B R point 5 y coordinate high byte 0x817C R point 5 size low...

Страница 16: ...f the key will be 0x8177 Gesture Features share the addresses with the coordinate information Addr Access bit7 bit6 bit5 bit4 bit3 bit2 bit1 bit0 0x8140 R Gesture ID first Byte ASCII G 0x8141 R Gestur...

Страница 17: ...R Gesture P2 X coor high byte 0x8163 R Gesture P2 Y coor low byte 0x8164 R Gesture P2 Y coor high byte 0x8165 R Gesture P3 X coor low byte 0x8166 R Gesture P3 X coor high byte 0x8167 R Gesture P3 Y c...

Страница 18: ...es track id is 32 The host can issue command 0X29 to enable GT911 to exit master approach mode 0xAA When GT911 successfully detect another hotknot featured terminal the host downloads and sends the ho...

Страница 19: ...ry description on some registers The data read from this area is valid only when GT911 operates in Receive Mode or Send Mode that is to say only when GT911_Status is 0xAA or 0xBB 0xAB10 SendStatus Thi...

Страница 20: ...ecting data from the transmitting terminal but no valid signal has been detected yet 0x02 indicates GT911 has detected the start signal and is receiving data 0x03 indicates GT911 has received a data f...

Страница 21: ...k If the values are different the host will read the values again 2ms later 3 6 HotKnot Transmit Buffer Addr Access bit7 bit6 bit5 bit4 bit3 bit2 bit1 bit0 0xAC90 W DataLength valid data length 129 by...

Страница 22: ...0xAE92 0xAE93 R Crc16Check data CRC16 verification Please note that it should stay behind the data not fixed in this address big edian mode Supplementary description on some registers The data in thi...

Страница 23: ...cData unsigned short Crc16 unsigned char SrcData unsigned char length unsigned short crc 0xFFFF unsigned char i j unsigned char value bit flag bit c15 for i 0 i length i value SrcData i for j 0 j 8 j...

Страница 24: ...0x29 host outputs high if the address is 0xBA 0xBB host outputs low Timing for host resetting GT911 4 2 I2 C address selection during power on or reset process GT911 supports two I2 C slave device ad...

Страница 25: ...When modifying any register in the configuration area 0x8047 0x80FE based on the timing sequence as specified in section 2 it is required to update Config_Chksum 0x80FF and eventually set Config_Fresh...

Страница 26: ...al output take the rising edge triggered interrupt for example The timing for falling edge triggered interrupt is similar to this one 1 In standby mode INT outputs low level 2 Output rising edge when...

Страница 27: ...ble GT911 operates in Normal mode If no touch is detected within that period GT911 enters Low Power mode low speed scan a Normal Mode When GT911 is operating in Normal mode its fastest coordinates ref...

Страница 28: ...any writing of specified lower case letters on the TP INT will output high level or a pulse that is greater than 250us The host wakes up and turns on the screen after receiving such high level or pul...

Страница 29: ...er the two terminals have detected each other Then the host downloads and sends HotKnot transmission firmware to enable GT911 to enter Receive mode f Receive Mode When GT911 operates in Approach mode...

Страница 30: ...vel 7 2 Enter Sleep Mode after screen off a If screen off is achieved by pressing Power key or any other key send Command 5 to 0x8040 b If screen off is achieved due to timeout send Command 5 to 0x804...

Страница 31: ...And then it reads the registers ranged from 0x9420 to 0x951F based on the principle that every four register correspond to one touch point Finally the host can describe the real touch trajectory of us...

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