TouchKey_4_3inch.cpp

00001 /* mbed Microcontroller Library
00002  * Copyright (C) 2016 Renesas Electronics Corporation. All rights reserved.
00003  *
00004  * Licensed under the Apache License, Version 2.0 (the "License");
00005  * you may not use this file except in compliance with the License.
00006  * You may obtain a copy of the License at
00007  *
00008  *     http://www.apache.org/licenses/LICENSE-2.0
00009  *
00010  * Unless required by applicable law or agreed to in writing, software
00011  * distributed under the License is distributed on an "AS IS" BASIS,
00012  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
00013  * See the License for the specific language governing permissions and
00014  * limitations under the License.
00015  */
00016 
00017 #include "TouchKey_4_3inch.h"
00018 
00019 TouchKey_4_3inch::TouchKey_4_3inch(PinName tprst, PinName tpint, PinName sda, PinName scl) :
00020  TouchKey(tprst, tpint), i2c(sda, scl) {
00021 }
00022 
00023 int TouchKey_4_3inch::GetMaxTouchNum(void) {
00024     return 1;
00025 }
00026 
00027 int TouchKey_4_3inch::GetCoordinates(int touch_buff_num, touch_pos_t * p_touch) {
00028     char buf[8];
00029     stx_report_data_t *pdata;
00030     touch_pos_t * wk_touch;
00031     int count = 0;
00032     int i;
00033     int read_size;
00034 
00035     if (touch_buff_num > GetMaxTouchNum()) {
00036         touch_buff_num =  GetMaxTouchNum();
00037     }
00038     if (touch_buff_num < 2) {
00039         read_size = 5;
00040     } else {
00041         read_size = 8;
00042     }
00043 
00044     if (p_touch != NULL) {
00045         for (i = 0; i < touch_buff_num; i++) {
00046             wk_touch        = &p_touch[i];
00047             wk_touch->x     = 0;
00048             wk_touch->y     = 0;
00049             wk_touch->valid = false;
00050         }
00051         if (i2c.read((0x55 << 1), buf, read_size) == 0) {
00052             pdata = (stx_report_data_t *)buf;
00053             if (pdata->fingers) {
00054                 for (i = 0; i < touch_buff_num; i++) {
00055                     if (pdata->xyz_data[i].valid) {
00056                         wk_touch        = &p_touch[i];
00057                         wk_touch->x     = (pdata->xyz_data[i].x_h << 8) | pdata->xyz_data[i].x_l;
00058                         wk_touch->y     = (pdata->xyz_data[i].y_h << 8) | pdata->xyz_data[i].y_l;
00059                         wk_touch->valid = true;
00060                         count++;
00061                     }
00062                 }
00063             }
00064         }
00065     }
00066 
00067     return count;
00068 }
00069 
00070