Touch the buttons-simulate an I2C-driven ts12 Chip

Ts12 chip driver

Use the analog I2C driver ts12 to complete the touch button detection function:

# Include "ipv8s. H "# include" Global. H "# include" drv_key.h "uint8_t keybyte; /*************************************** **************************************** // function: i2c_int // Description: simulate I2C and ds1307 port initialization // Param: // return: // Author: huangzhigang 2014-0410 ************************************ **************************************** * **/static void i2c_int (void) {iic_sda_output; iic_scl_output ;}/ **************************************** ***************************************/ /Function: delay_5us // Description: the latency of the latency function is about 16 us // Param: // return: FCPU 16 MHz // Author: huangzhigang 2014-0410 ************************************ **************************************** * **/static void delay_5us (void) {uint8_t I; for (I = 5; I> 0; I --);} /*************************************** ****************** * ******************** // Function: i2c_start // description: i2C starts to transmit signals when the SCL is high, SDA changes from high to low // Param: // return: // Author: huangzhigang 2014-0410 ************************************ **************************************** * **/static void i2c_start (void) {// SDA 1-> 0 while SCL high sda_high; scl_high; delay_5us (); sda_low; delay_5us (); scl_low ;} /*************************************** ****************** * ******************** // Function: i2c_stop // description: i2C stop transmission signal when the SCL is high, SDA changes from low to high // Param: // return: // Author: huangzhigang 2014-0410 ************************************ **************************************** * **/static void i2c_stop (void) {// SDA 0-> 1 while SCL high sda_low; scl_high; delay_5us (); sda_high; delay_5us ();} /*************************************** ***************************** * ********* // Function: i2c_sendack // Description: The host sends a response signal to the slave host // Param: Response Signal 1: SDA high (no response) 0: SDA low (with a response) // return: // Author: huangzhigang 2014-0410 ************************************ **************************************** * **/static void i2c_sendack (uint8_t ACK) {If (ACK = 0) {sda_low;} else {sda_high;} scl_high; delay_5us (); scl_low; delay_5us ();} /*************************************** * ***************************************/ /Function: i2c_sendbyte // Description: simulate I2C communication to send 8-Bit Data // Param: The sent 8 is the data value // return: return response signal 0 indicates there is a response 1 indicates no response // Author: huangzhigang 2014-0410 ************************************ **************************************** * **/static uint8_t i2c_sendbyte (uint8_t sendbyte) {static uint8_t I, revackts; sda_low; for (I = 0; I <8; I ++) {scl_low; If (sendbyte & 0x80) // wri Te data {sda_high;} else {sda_low;} delay_5us (); sendbyte <= 1; scl_high; delay_5us ();} scl_low; sda_high; lower (); lower; scl_high; ASM ("NOP"); ASM ("NOP"); revackts = (uint8_t) read_sda; delay_5us (); scl_low; iic_sda_output; delay_5us (); Return revackts ;} /*************************************** **************************************** // function: i2c_recvbyte // Description: simulate I2C communication The email reads 8-bit data from the slave machine // Param: // return: The returned 8 data values are: // Author: huangzhigang 2014-0410 ************************************ **************************************** * **/static uint8_t i2c_recvbyte () {uint8_t I; uint8_t recvdata = 0; sda_high; // latch the data port befor reading iic_sda_input; for (I = 0; I <8; I ++) {recvdata <= 1; scl_high; ASM ("NOP"); ASM ("NOP"); If (read_sda) {recvdata | = 0x01;} else {Recv Data & = 0xfe;} delay_5us (); scl_low; delay_5us ();} iic_sda_output; return recvdata ;} /*************************************** **************************************** // function: ts12_writebyte // Description: simulate I2C communication and write 1 byte of data to the specified address // Param: writeaddr: data to be written writedata; write address // return: 1: successfully written 0: write error // Author: huangzhigang 2014-0410 ************************************ *********************************** * ******/Uint8_t ts12_writebyte (uint8_t writeaddr, uint8_t writedata) {i2c_start (); If (0xf0) // device ADDR + write (Operation) {return 0;} If (i2c_sendbyte (writeaddr) {return 0;} If (i2c_sendbyte (writedata) {return 0;} i2c_stop (); return 1 ;} /*************************************** **************************************** // function: ts12_readbyte // Description: reads 1 word from the specified address through analog I2C communication. Section Data // Param: readaddr: Read address // return: revdata: read 8-Bit Data // Author: huangzhigang 2014-0410 ************************************ **************************************** * **/uint8_t ts12_readbyte (uint8_t readaddr) {uint8_t revdata; i2c_start (); i2c_sendbyte (0xf0); // device ADDR + write (operation) values (readaddr); i2c_start (); i2c_sendbyte (0xf1 ); // device ADDR + Read (operation) revdata = i2c_rec Vbyte (); i2c_sendack (1); i2c_stop (); Return revdata;} void ts12_initagain () {i2c_start (); random (0xf0); i2c_sendbyte (0x02 ); values (0xaa); // sensitivity1 i2c_sendbyte (0xaa); i2c_sendbyte (0xaa); values (0xaa); values (0xaa); values (0xaa); i2c_sendbyte (0x33 ); // ctrl1 i2c_stop (); i2c_start (); i2c_sendbyte (0xf0); i2c_sendbyte (0x0a); i2c_sendbyte (0x00); // ref_rst1 i2c_sendbyte (0x00); // ref_rst2 i2c_sendbyte (0x00); // ch_hold1 i2c_sendbyte (0x00); // ch_hold2 i2c_sendbyte (0x00 ); // cal_hold1 i2c_sendbyte (0x00); // cal_hold2 i2c_stop ();} /*************************************** **************************************** // function: ts12_init // Description: simulate I2C communication and write 8 bytes of data from 0x02 ~ 0x0f // Param: pwritedata: pointer pointing to the address of the array to be written // return: // Author: huangzhigang 2014-0410 ************************************ **************************************** * **/void ts12_init () {i2c_int (); i2c_start (); i2c_sendbyte (0xf0); // device ADDR + write (operation) values (0x09); i2c_sendbyte (0x0f); i2c_stop (); ts12_initagain (); i2c_start (); i2c_sendbyte (0xf0); // device ADDR + write (operation) I2C _ Sendbyte (0x09); i2c_sendbyte (0x07); i2c_stop ();} /*************************************** **************************************** // function: ts12_readkey // Description: reads 8 bytes of data from 0x10 ~ 0x12 // Param: preaddata: pointer to the array that stores the data // return: // Author: huangzhigang 2014-0410 ************************************ **************************************** * **/void ts12_readkey () {static uint8_t keyvalue1; static uint8_t keyvalue2; static uint8_t keyvalue3; i2c_start (); values (0xf0); // device ADDR + write (operation) i2c_sendbyte (0x10 ); // i2c_stop (); // you can add i2c_start (); i2c_sendbyte (0xf1); // device ADDR + Read (Operation) keyvalue1 = i2c_recvbyte (); i2c_sendack (0); // Dio low level indicates ack keybyte = key_event_null_click; // If (keyvalue1> 6) & 0x03)> = keystandard) // I-sense {keybyte + = key_event_smart_click;} If (keyvalue1> 4) & 0x03)> = keystandard) // crisper {keybyte + = key_event_criper_click;} If (keyvalue1> 2) & 0x03)> = keystandard) // mode {keybyte + = key_event_mode_click ;} if (keyvalue1) & 0x03> = keystandard) // down {keybyte + = key_event_down_click;} keyvalue2 = i2c_recvbyte (); i2c_sendack (0 ); // Dio low-level expression ack if (keyvalue2> 6) & 0x03)> = keystandard) // auto defrost {keybyte + = key_event_ad_click ;} if (keyvalue2> 4) & 0x03)> = keystandard) // up {keybyte + = key_event_ice_click;} If (keyvalue2> 2) & 0x03)> = keystandard) // fast ice {keybyte + = key_event_up_click;} If (keyvalue2 & 0x03)> = keystandard) // energy saving {keybyte + = key_event_save_click;} keyvalue3 = i2c_recvbyte (); i2c_sendack (1); If (keyvalue3 & 0x03)> = keystandard) // Manual defrost {keybyte + = key_event_md_click;} i2c_stop ();}