153 lines
3.2 KiB
C
153 lines
3.2 KiB
C
/*
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* This file is subject to the terms of the GFX License. If a copy of
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* the license was not distributed with this file, you can obtain one at:
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*
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* http://ugfx.org/license.html
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*/
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/**
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* @file boards/base/Mikromedia-STM32-M4-ILI9341/ginput_lld_mouse_board.h
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* @brief GINPUT Touch low level driver source for the MCU.
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*/
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#ifndef _GINPUT_LLD_MOUSE_BOARD_H
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#define _GINPUT_LLD_MOUSE_BOARD_H
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/* read ADC if more than this many ticks since last read */
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#define ADC_UPDATE_INTERVAL 3
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#define ADC_NUM_CHANNELS 2
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#define ADC_BUF_DEPTH 1
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static const ADCConversionGroup adcgrpcfg = {
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FALSE,
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ADC_NUM_CHANNELS,
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NULL,
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NULL,
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/* HW dependent part.*/
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0,
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ADC_CR2_SWSTART,
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0,
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0,
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ADC_SQR1_NUM_CH(ADC_NUM_CHANNELS),
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0,
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ADC_SQR3_SQ2_N(ADC_CHANNEL_IN8) | ADC_SQR3_SQ1_N(ADC_CHANNEL_IN9)
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};
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static systime_t last_update;
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static volatile uint16_t tpx, tpy, detect;
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static inline void delay(uint16_t dly) {
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static uint16_t i;
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for(i = 0; i < dly; i++)
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asm("nop");
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}
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void read_mikro_tp(void) {
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systime_t now = chTimeNow();
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adcsample_t samples[ADC_NUM_CHANNELS * ADC_BUF_DEPTH];
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uint16_t _detect, _tpx, _tpy;
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if(now < last_update || ((now - last_update) > ADC_UPDATE_INTERVAL)) {
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// detect button press
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// sample[0] will go from ~200 to ~4000 when pressed
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adcConvert(&ADCD1, &adcgrpcfg, samples, ADC_BUF_DEPTH);
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_detect = samples[0];
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// read x channel
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palSetPad(GPIOB, GPIOB_DRIVEA);
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palClearPad(GPIOB, GPIOB_DRIVEB);
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chThdSleepMilliseconds(1);
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adcConvert(&ADCD1, &adcgrpcfg, samples, ADC_BUF_DEPTH);
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_tpx = samples[1];
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// read y channel (invert)
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palClearPad(GPIOB, GPIOB_DRIVEA);
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palSetPad(GPIOB, GPIOB_DRIVEB);
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chThdSleepMilliseconds(1);
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adcConvert(&ADCD1, &adcgrpcfg, samples, ADC_BUF_DEPTH);
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_tpy = samples[0];
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// ready for next read
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palClearPad(GPIOB, GPIOB_DRIVEA);
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palClearPad(GPIOB, GPIOB_DRIVEB);
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chSysLock();
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tpx = _tpx;
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tpy = _tpy;
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detect = _detect;
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last_update = now;
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chSysUnlock();
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}
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}
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/**
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* @brief Initialise the board for the touch.
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*
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* @notapi
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*/
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static inline void init_board(void) {
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adcStart(&ADCD1, NULL);
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last_update = chTimeNow();
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// leave DRIVEA & DRIVEB ready for next read
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palClearPad(GPIOB, GPIOB_DRIVEA);
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palClearPad(GPIOB, GPIOB_DRIVEB);
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chThdSleepMilliseconds(1);
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}
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/**
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* @brief Check whether the surface is currently touched
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* @return TRUE if the surface is currently touched
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*
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* @notapi
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*/
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static inline bool_t getpin_pressed(void) {
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read_mikro_tp();
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return (detect > 2000) ? true : false;
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}
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/**
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* @brief Aquire the bus ready for readings
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*
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* @notapi
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*/
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static inline void aquire_bus(void) {
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}
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/**
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* @brief Release the bus after readings
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*
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* @notapi
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*/
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static inline void release_bus(void) {
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}
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/**
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* @brief Read an x value from touch controller
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* @return The value read from the controller
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*
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* @notapi
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*/
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static inline uint16_t read_x_value(void) {
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read_mikro_tp();
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return tpx;
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}
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/**
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* @brief Read an y value from touch controller
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* @return The value read from the controller
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*
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* @notapi
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*/
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static inline uint16_t read_y_value(void) {
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read_mikro_tp();
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return tpy;
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}
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#endif /* _GINPUT_LLD_MOUSE_BOARD_H */
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