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180 lines
3.9 KiB
C
180 lines
3.9 KiB
C
/**
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* @file FT5406EE8.c
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*
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*/
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/*********************
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* INCLUDES
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*********************/
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#include "FT5406EE8.h"
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#if USE_FT5406EE8
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#include <stddef.h>
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#include <stdbool.h>
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#include LV_DRV_INDEV_INCLUDE
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#include LV_DRV_DELAY_INCLUDE
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/*********************
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* DEFINES
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*********************/
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#define I2C_WR_BIT 0x00
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#define I2C_RD_BIT 0x01
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/*DEVICE MODES*/
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#define OPERAT_MD 0x00
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#define TEST_MD 0x04
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#define SYS_INF_MD 0x01
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/*OPERATING MODE*/
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#define DEVICE_MODE 0x00
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#define GEST_ID 0x01
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#define TD_STATUS 0x02
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#define FT5406EE8_FINGER_MAX 10
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/*Register addresses*/
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#define FT5406EE8_REG_DEVICE_MODE 0x00
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#define FT5406EE8_REG_GEST_ID 0x01
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#define FT5406EE8_REG_TD_STATUS 0x02
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#define FT5406EE8_REG_YH 0x03
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#define FT5406EE8_REG_YL 0x04
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#define FT5406EE8_REG_XH 0x05
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#define FT5406EE8_REG_XL 0x06
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/**********************
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* TYPEDEFS
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**********************/
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/**********************
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* STATIC PROTOTYPES
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**********************/
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static bool ft5406ee8_get_touch_num(void);
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static bool ft5406ee8_read_finger1(int16_t * x, int16_t * y);
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/**********************
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* STATIC VARIABLES
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**********************/
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/**********************
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* MACROS
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**********************/
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/**********************
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* GLOBAL FUNCTIONS
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**********************/
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/**
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*
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*/
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void ft5406ee8_init(void)
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{
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}
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/**
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* Get the current position and state of the touchpad
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* @param data store the read data here
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* @return false: because no ore data to be read
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*/
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bool ft5406ee8_read(lv_indev_drv_t * indev_drv, lv_indev_data_t * data)
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{
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static int16_t x_last;
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static int16_t y_last;
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int16_t x;
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int16_t y;
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bool valid = true;
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valid = ft5406ee8_get_touch_num();
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if(valid == true) {
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valid = ft5406ee8_read_finger1(&x, &y);
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}
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if(valid == true) {
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x = (uint32_t)((uint32_t)x * 320) / 2048;
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y = (uint32_t)((uint32_t)y * 240) / 2048;
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x_last = x;
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y_last = y;
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} else {
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x = x_last;
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y = y_last;
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}
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data->point.x = x;
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data->point.y = y;
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data->state = valid == false ? LV_INDEV_STATE_REL : LV_INDEV_STATE_PR;
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return false;
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}
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/**********************
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* STATIC FUNCTIONS
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**********************/
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static bool ft5406ee8_get_touch_num(void)
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{
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bool ok = true;
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uint8_t t_num = 0;
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LV_DRV_INDEV_I2C_START;
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LV_DRV_INDEV_I2C_WR((FT5406EE8_I2C_ADR << 1) | I2C_WR_BIT);
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LV_DRV_INDEV_I2C_WR(FT5406EE8_REG_TD_STATUS)
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LV_DRV_INDEV_I2C_RESTART;
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LV_DRV_INDEV_I2C_WR((FT5406EE8_I2C_ADR << 1) | I2C_RD_BIT);
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t_num = LV_DRV_INDEV_I2C_READ(0);
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/* Error if not touched or too much finger */
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if(t_num > FT5406EE8_FINGER_MAX || t_num == 0) {
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ok = false;
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}
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return ok;
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}
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/**
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* Read the x and y coordinated
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* @param x store the x coordinate here
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* @param y store the y coordinate here
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* @return false: not valid point; true: valid point
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*/
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static bool ft5406ee8_read_finger1(int16_t * x, int16_t * y)
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{
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uint8_t temp_xH = 0;
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uint8_t temp_xL = 0;
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uint8_t temp_yH = 0;
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uint8_t temp_yL = 0;
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/*Read Y High and low byte*/
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LV_DRV_INDEV_I2C_START;
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LV_DRV_INDEV_I2C_WR((FT5406EE8_I2C_ADR << 1) | I2C_WR_BIT);
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LV_DRV_INDEV_I2C_WR(FT5406EE8_REG_YH)
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LV_DRV_INDEV_I2C_RESTART;
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LV_DRV_INDEV_I2C_WR((FT5406EE8_I2C_ADR << 1) | I2C_RD_BIT);
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temp_yH = LV_DRV_INDEV_I2C_READ(1);
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temp_yL = LV_DRV_INDEV_I2C_READ(1);
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/*The upper two bit must be 2 on valid press*/
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if(((temp_yH >> 6) & 0xFF) != 2) {
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(void) LV_DRV_INDEV_I2C_READ(0); /*Dummy read to close read sequence*/
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*x = 0;
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*y = 0;
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return false;
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}
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/*Read X High and low byte*/
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temp_xH = LV_DRV_INDEV_I2C_READ(1);
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temp_xL = LV_DRV_INDEV_I2C_READ(0);
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/*Save the result*/
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*x = (temp_xH & 0x0F) << 8;
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*x += temp_xL;
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*y = (temp_yH & 0x0F) << 8;
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*y += temp_yL;
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return true;
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}
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#endif
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