Jenny Plunkett / Mbed OS LPCXpresso54608-Touch-Cursor-Example

NXP Touch Cursor example for LPCXpresso54608, modified for use with Mbed OS.

The tutorial for this example can be found here: https://os.mbed.com/blog/entry/How-to-LPCXpresso54608-touch-panel/

touchpanel/fsl_ft5406.cpp@0:c107a6f8c368, 2018-04-11 (annotated)

Committer:
jplunkett
Date:
Wed Apr 11 20:46:55 2018 +0000
Revision:
0:c107a6f8c368
Init

Who changed what in which revision?

UserRevisionLine numberNew contents of line
jplunkett 0:c107a6f8c368 1 /*
jplunkett 0:c107a6f8c368 2 * The Clear BSD License
jplunkett 0:c107a6f8c368 3 * Copyright (c) 2016, Freescale Semiconductor, Inc.
jplunkett 0:c107a6f8c368 4 * Copyright 2016-2017 NXP
jplunkett 0:c107a6f8c368 5 * All rights reserved.
jplunkett 0:c107a6f8c368 6 *
jplunkett 0:c107a6f8c368 7 * Redistribution and use in source and binary forms, with or without modification,
jplunkett 0:c107a6f8c368 8 * are permitted (subject to the limitations in the disclaimer below) provided
jplunkett 0:c107a6f8c368 9 * that the following conditions are met:
jplunkett 0:c107a6f8c368 10 *
jplunkett 0:c107a6f8c368 11 * o Redistributions of source code must retain the above copyright notice, this list
jplunkett 0:c107a6f8c368 12 * of conditions and the following disclaimer.
jplunkett 0:c107a6f8c368 13 *
jplunkett 0:c107a6f8c368 14 * o Redistributions in binary form must reproduce the above copyright notice, this
jplunkett 0:c107a6f8c368 15 * list of conditions and the following disclaimer in the documentation and/or
jplunkett 0:c107a6f8c368 16 * other materials provided with the distribution.
jplunkett 0:c107a6f8c368 17 *
jplunkett 0:c107a6f8c368 18 * o Neither the name of the copyright holder nor the names of its
jplunkett 0:c107a6f8c368 19 * contributors may be used to endorse or promote products derived from this
jplunkett 0:c107a6f8c368 20 * software without specific prior written permission.
jplunkett 0:c107a6f8c368 21 *
jplunkett 0:c107a6f8c368 22 * NO EXPRESS OR IMPLIED LICENSES TO ANY PARTY'S PATENT RIGHTS ARE GRANTED BY THIS LICENSE.
jplunkett 0:c107a6f8c368 23 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
jplunkett 0:c107a6f8c368 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
jplunkett 0:c107a6f8c368 25 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
jplunkett 0:c107a6f8c368 26 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
jplunkett 0:c107a6f8c368 27 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
jplunkett 0:c107a6f8c368 28 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
jplunkett 0:c107a6f8c368 29 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
jplunkett 0:c107a6f8c368 30 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
jplunkett 0:c107a6f8c368 31 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
jplunkett 0:c107a6f8c368 32 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
jplunkett 0:c107a6f8c368 33 */
jplunkett 0:c107a6f8c368 34
jplunkett 0:c107a6f8c368 35 #include "fsl_common.h"
jplunkett 0:c107a6f8c368 36 //#include "fsl_debug_console.h"
jplunkett 0:c107a6f8c368 37 #include "fsl_i2c.h"
jplunkett 0:c107a6f8c368 38 #include "fsl_ft5406.h"
jplunkett 0:c107a6f8c368 39
jplunkett 0:c107a6f8c368 40 typedef struct _ft5406_touch_point
jplunkett 0:c107a6f8c368 41 {
jplunkett 0:c107a6f8c368 42 uint8_t XH;
jplunkett 0:c107a6f8c368 43 uint8_t XL;
jplunkett 0:c107a6f8c368 44 uint8_t YH;
jplunkett 0:c107a6f8c368 45 uint8_t YL;
jplunkett 0:c107a6f8c368 46 uint8_t RESERVED[2];
jplunkett 0:c107a6f8c368 47 } ft5406_touch_point_t;
jplunkett 0:c107a6f8c368 48
jplunkett 0:c107a6f8c368 49 typedef struct _ft5406_touch_data
jplunkett 0:c107a6f8c368 50 {
jplunkett 0:c107a6f8c368 51 uint8_t GEST_ID;
jplunkett 0:c107a6f8c368 52 uint8_t TD_STATUS;
jplunkett 0:c107a6f8c368 53 ft5406_touch_point_t TOUCH[FT5406_MAX_TOUCHES];
jplunkett 0:c107a6f8c368 54 } ft5406_touch_data_t;
jplunkett 0:c107a6f8c368 55
jplunkett 0:c107a6f8c368 56 #define TOUCH_POINT_GET_EVENT(T) ((touch_event_t)((T).XH >> 6))
jplunkett 0:c107a6f8c368 57 #define TOUCH_POINT_GET_ID(T) ((T).YH >> 4)
jplunkett 0:c107a6f8c368 58 #define TOUCH_POINT_GET_X(T) ((((T).XH & 0x0f) << 8) | (T).XL)
jplunkett 0:c107a6f8c368 59 #define TOUCH_POINT_GET_Y(T) ((((T).YH & 0x0f) << 8) | (T).YL)
jplunkett 0:c107a6f8c368 60
jplunkett 0:c107a6f8c368 61 status_t FT5406_Init(ft5406_handle_t *handle, I2C_Type *base)
jplunkett 0:c107a6f8c368 62 {
jplunkett 0:c107a6f8c368 63 i2c_master_transfer_t *xfer = &(handle->xfer);
jplunkett 0:c107a6f8c368 64 status_t status;
jplunkett 0:c107a6f8c368 65 uint8_t mode;
jplunkett 0:c107a6f8c368 66
jplunkett 0:c107a6f8c368 67 assert(handle);
jplunkett 0:c107a6f8c368 68 assert(base);
jplunkett 0:c107a6f8c368 69
jplunkett 0:c107a6f8c368 70 if (!handle || !base)
jplunkett 0:c107a6f8c368 71 {
jplunkett 0:c107a6f8c368 72 return kStatus_InvalidArgument;
jplunkett 0:c107a6f8c368 73 }
jplunkett 0:c107a6f8c368 74
jplunkett 0:c107a6f8c368 75 handle->base = base;
jplunkett 0:c107a6f8c368 76
jplunkett 0:c107a6f8c368 77 /* clear transfer structure and buffer */
jplunkett 0:c107a6f8c368 78 memset(xfer, 0, sizeof(*xfer));
jplunkett 0:c107a6f8c368 79 memset(handle->touch_buf, 0, FT5406_TOUCH_DATA_LEN);
jplunkett 0:c107a6f8c368 80
jplunkett 0:c107a6f8c368 81 /* set device mode to normal operation */
jplunkett 0:c107a6f8c368 82 mode = 0;
jplunkett 0:c107a6f8c368 83 xfer->slaveAddress = 0x38;
jplunkett 0:c107a6f8c368 84 xfer->direction = kI2C_Write;
jplunkett 0:c107a6f8c368 85 xfer->subaddress = 0;
jplunkett 0:c107a6f8c368 86 xfer->subaddressSize = 1;
jplunkett 0:c107a6f8c368 87 xfer->data = &mode;
jplunkett 0:c107a6f8c368 88 xfer->dataSize = 1;
jplunkett 0:c107a6f8c368 89 xfer->flags = kI2C_TransferDefaultFlag;
jplunkett 0:c107a6f8c368 90
jplunkett 0:c107a6f8c368 91 status = I2C_MasterTransferBlocking(handle->base, &handle->xfer);
jplunkett 0:c107a6f8c368 92
jplunkett 0:c107a6f8c368 93 /* prepare transfer structure for reading touch data */
jplunkett 0:c107a6f8c368 94 xfer->slaveAddress = 0x38;
jplunkett 0:c107a6f8c368 95 xfer->direction = kI2C_Read;
jplunkett 0:c107a6f8c368 96 xfer->subaddress = 1;
jplunkett 0:c107a6f8c368 97 xfer->subaddressSize = 1;
jplunkett 0:c107a6f8c368 98 xfer->data = handle->touch_buf;
jplunkett 0:c107a6f8c368 99 xfer->dataSize = FT5406_TOUCH_DATA_LEN;
jplunkett 0:c107a6f8c368 100 xfer->flags = kI2C_TransferDefaultFlag;
jplunkett 0:c107a6f8c368 101
jplunkett 0:c107a6f8c368 102 return status;
jplunkett 0:c107a6f8c368 103 }
jplunkett 0:c107a6f8c368 104
jplunkett 0:c107a6f8c368 105 status_t FT5406_Denit(ft5406_handle_t *handle)
jplunkett 0:c107a6f8c368 106 {
jplunkett 0:c107a6f8c368 107 assert(handle);
jplunkett 0:c107a6f8c368 108
jplunkett 0:c107a6f8c368 109 if (!handle)
jplunkett 0:c107a6f8c368 110 {
jplunkett 0:c107a6f8c368 111 return kStatus_InvalidArgument;
jplunkett 0:c107a6f8c368 112 }
jplunkett 0:c107a6f8c368 113
jplunkett 0:c107a6f8c368 114 handle->base = NULL;
jplunkett 0:c107a6f8c368 115 return kStatus_Success;
jplunkett 0:c107a6f8c368 116 }
jplunkett 0:c107a6f8c368 117
jplunkett 0:c107a6f8c368 118 status_t FT5406_ReadTouchData(ft5406_handle_t *handle)
jplunkett 0:c107a6f8c368 119 {
jplunkett 0:c107a6f8c368 120 assert(handle);
jplunkett 0:c107a6f8c368 121
jplunkett 0:c107a6f8c368 122 if (!handle)
jplunkett 0:c107a6f8c368 123 {
jplunkett 0:c107a6f8c368 124 return kStatus_InvalidArgument;
jplunkett 0:c107a6f8c368 125 }
jplunkett 0:c107a6f8c368 126
jplunkett 0:c107a6f8c368 127 return I2C_MasterTransferBlocking(handle->base, &handle->xfer);
jplunkett 0:c107a6f8c368 128 }
jplunkett 0:c107a6f8c368 129
jplunkett 0:c107a6f8c368 130 status_t FT5406_GetSingleTouch(ft5406_handle_t *handle, touch_event_t *touch_event, int *touch_x, int *touch_y)
jplunkett 0:c107a6f8c368 131 {
jplunkett 0:c107a6f8c368 132 status_t status;
jplunkett 0:c107a6f8c368 133 touch_event_t touch_event_local;
jplunkett 0:c107a6f8c368 134
jplunkett 0:c107a6f8c368 135 status = FT5406_ReadTouchData(handle);
jplunkett 0:c107a6f8c368 136
jplunkett 0:c107a6f8c368 137 if (status == kStatus_Success)
jplunkett 0:c107a6f8c368 138 {
jplunkett 0:c107a6f8c368 139 ft5406_touch_data_t *touch_data = (ft5406_touch_data_t *)(void *)(handle->touch_buf);
jplunkett 0:c107a6f8c368 140
jplunkett 0:c107a6f8c368 141 if (touch_event == NULL)
jplunkett 0:c107a6f8c368 142 {
jplunkett 0:c107a6f8c368 143 touch_event = &touch_event_local;
jplunkett 0:c107a6f8c368 144 }
jplunkett 0:c107a6f8c368 145 *touch_event = TOUCH_POINT_GET_EVENT(touch_data->TOUCH[0]);
jplunkett 0:c107a6f8c368 146
jplunkett 0:c107a6f8c368 147 /* Update coordinates only if there is touch detected */
jplunkett 0:c107a6f8c368 148 if ((*touch_event == kTouch_Down) || (*touch_event == kTouch_Contact))
jplunkett 0:c107a6f8c368 149 {
jplunkett 0:c107a6f8c368 150 if (touch_x)
jplunkett 0:c107a6f8c368 151 {
jplunkett 0:c107a6f8c368 152 *touch_x = TOUCH_POINT_GET_X(touch_data->TOUCH[0]);
jplunkett 0:c107a6f8c368 153 }
jplunkett 0:c107a6f8c368 154 if (touch_y)
jplunkett 0:c107a6f8c368 155 {
jplunkett 0:c107a6f8c368 156 *touch_y = TOUCH_POINT_GET_Y(touch_data->TOUCH[0]);
jplunkett 0:c107a6f8c368 157 }
jplunkett 0:c107a6f8c368 158 }
jplunkett 0:c107a6f8c368 159 }
jplunkett 0:c107a6f8c368 160
jplunkett 0:c107a6f8c368 161 return status;
jplunkett 0:c107a6f8c368 162 }
jplunkett 0:c107a6f8c368 163
jplunkett 0:c107a6f8c368 164 status_t FT5406_GetMultiTouch(ft5406_handle_t *handle, int *touch_count, touch_point_t touch_array[FT5406_MAX_TOUCHES])
jplunkett 0:c107a6f8c368 165 {
jplunkett 0:c107a6f8c368 166 status_t status;
jplunkett 0:c107a6f8c368 167
jplunkett 0:c107a6f8c368 168 status = FT5406_ReadTouchData(handle);
jplunkett 0:c107a6f8c368 169
jplunkett 0:c107a6f8c368 170 if (status == kStatus_Success)
jplunkett 0:c107a6f8c368 171 {
jplunkett 0:c107a6f8c368 172 ft5406_touch_data_t *touch_data = (ft5406_touch_data_t *)(void *)(handle->touch_buf);
jplunkett 0:c107a6f8c368 173 int i;
jplunkett 0:c107a6f8c368 174
jplunkett 0:c107a6f8c368 175 /* Decode number of touches */
jplunkett 0:c107a6f8c368 176 if (touch_count)
jplunkett 0:c107a6f8c368 177 {
jplunkett 0:c107a6f8c368 178 *touch_count = touch_data->TD_STATUS;
jplunkett 0:c107a6f8c368 179 }
jplunkett 0:c107a6f8c368 180
jplunkett 0:c107a6f8c368 181 /* Decode valid touch points */
jplunkett 0:c107a6f8c368 182 for (i = 0; i < touch_data->TD_STATUS; i++)
jplunkett 0:c107a6f8c368 183 {
jplunkett 0:c107a6f8c368 184 touch_array[i].TOUCH_ID = TOUCH_POINT_GET_ID(touch_data->TOUCH[i]);
jplunkett 0:c107a6f8c368 185 touch_array[i].TOUCH_EVENT = TOUCH_POINT_GET_EVENT(touch_data->TOUCH[i]);
jplunkett 0:c107a6f8c368 186 touch_array[i].TOUCH_X = TOUCH_POINT_GET_X(touch_data->TOUCH[i]);
jplunkett 0:c107a6f8c368 187 touch_array[i].TOUCH_Y = TOUCH_POINT_GET_Y(touch_data->TOUCH[i]);
jplunkett 0:c107a6f8c368 188 }
jplunkett 0:c107a6f8c368 189
jplunkett 0:c107a6f8c368 190 /* Clear vacant elements of touch_array */
jplunkett 0:c107a6f8c368 191 for (; i < FT5406_MAX_TOUCHES; i++)
jplunkett 0:c107a6f8c368 192 {
jplunkett 0:c107a6f8c368 193 touch_array[i].TOUCH_ID = 0;
jplunkett 0:c107a6f8c368 194 touch_array[i].TOUCH_EVENT = kTouch_Reserved;
jplunkett 0:c107a6f8c368 195 touch_array[i].TOUCH_X = 0;
jplunkett 0:c107a6f8c368 196 touch_array[i].TOUCH_Y = 0;
jplunkett 0:c107a6f8c368 197 }
jplunkett 0:c107a6f8c368 198 }
jplunkett 0:c107a6f8c368 199
jplunkett 0:c107a6f8c368 200 return status;
jplunkett 0:c107a6f8c368 201 }