169 lines
6.5 KiB
C
169 lines
6.5 KiB
C
// Copyright 2015-2021 Espressif Systems (Shanghai) PTE LTD
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include "esp32-hal-touch.h"
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#include "freertos/FreeRTOS.h"
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#include "freertos/task.h"
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#include "rom/ets_sys.h"
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#include "esp_attr.h"
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#include "esp_intr.h"
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#include "soc/rtc_io_reg.h"
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#include "soc/rtc_cntl_reg.h"
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#include "soc/sens_reg.h"
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static uint16_t __touchSleepCycles = 0x1000;
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static uint16_t __touchMeasureCycles = 0x1000;
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typedef void (*voidFuncPtr)(void);
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static voidFuncPtr __touchInterruptHandlers[10] = {0,};
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static intr_handle_t touch_intr_handle = NULL;
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void IRAM_ATTR __touchISR(void * arg)
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{
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uint32_t pad_intr = READ_PERI_REG(SENS_SAR_TOUCH_CTRL2_REG) & 0x3ff;
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uint32_t rtc_intr = READ_PERI_REG(RTC_CNTL_INT_ST_REG);
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uint8_t i = 0;
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//clear interrupt
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WRITE_PERI_REG(RTC_CNTL_INT_CLR_REG, rtc_intr);
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SET_PERI_REG_MASK(SENS_SAR_TOUCH_CTRL2_REG, SENS_TOUCH_MEAS_EN_CLR);
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if (rtc_intr & RTC_CNTL_TOUCH_INT_ST) {
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for (i = 0; i < 10; ++i) {
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if ((pad_intr >> i) & 0x01) {
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if(__touchInterruptHandlers[i]){
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__touchInterruptHandlers[i]();
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}
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}
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}
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}
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}
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void __touchSetCycles(uint16_t measure, uint16_t sleep)
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{
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__touchSleepCycles = sleep;
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__touchMeasureCycles = measure;
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//Touch pad SleepCycle Time
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SET_PERI_REG_BITS(SENS_SAR_TOUCH_CTRL2_REG, SENS_TOUCH_SLEEP_CYCLES, __touchSleepCycles, SENS_TOUCH_SLEEP_CYCLES_S);
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//Touch Pad Measure Time
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SET_PERI_REG_BITS(SENS_SAR_TOUCH_CTRL1_REG, SENS_TOUCH_MEAS_DELAY, __touchMeasureCycles, SENS_TOUCH_MEAS_DELAY_S);
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}
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void __touchInit()
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{
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static bool initialized = false;
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if(initialized){
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return;
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}
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initialized = true;
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SET_PERI_REG_BITS(RTC_IO_TOUCH_CFG_REG, RTC_IO_TOUCH_XPD_BIAS, 1, RTC_IO_TOUCH_XPD_BIAS_S);
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SET_PERI_REG_MASK(SENS_SAR_TOUCH_CTRL2_REG, SENS_TOUCH_MEAS_EN_CLR);
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//clear touch enable
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WRITE_PERI_REG(SENS_SAR_TOUCH_ENABLE_REG, 0x0);
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SET_PERI_REG_MASK(RTC_CNTL_STATE0_REG, RTC_CNTL_TOUCH_SLP_TIMER_EN);
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__touchSetCycles(__touchMeasureCycles, __touchSleepCycles);
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esp_intr_alloc(ETS_RTC_CORE_INTR_SOURCE, (int)ESP_INTR_FLAG_IRAM, __touchISR, NULL, &touch_intr_handle);
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}
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uint16_t __touchRead(uint8_t pin)
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{
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int8_t pad = digitalPinToTouchChannel(pin);
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if(pad < 0){
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return 0;
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}
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pinMode(pin, ANALOG);
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__touchInit();
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uint32_t v0 = READ_PERI_REG(SENS_SAR_TOUCH_ENABLE_REG);
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//Disable Intr & enable touch pad
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WRITE_PERI_REG(SENS_SAR_TOUCH_ENABLE_REG,
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(v0 & ~((1 << (pad + SENS_TOUCH_PAD_OUTEN2_S)) | (1 << (pad + SENS_TOUCH_PAD_OUTEN1_S))))
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| (1 << (pad + SENS_TOUCH_PAD_WORKEN_S)));
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SET_PERI_REG_MASK(SENS_SAR_TOUCH_ENABLE_REG, (1 << (pad + SENS_TOUCH_PAD_WORKEN_S)));
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uint32_t rtc_tio_reg = RTC_IO_TOUCH_PAD0_REG + pad * 4;
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WRITE_PERI_REG(rtc_tio_reg, (READ_PERI_REG(rtc_tio_reg)
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& ~(RTC_IO_TOUCH_PAD0_DAC_M))
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| (7 << RTC_IO_TOUCH_PAD0_DAC_S)//Touch Set Slope
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| RTC_IO_TOUCH_PAD0_TIE_OPT_M //Enable Tie,Init Level
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| RTC_IO_TOUCH_PAD0_START_M //Enable Touch Pad IO
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| RTC_IO_TOUCH_PAD0_XPD_M); //Enable Touch Pad Power on
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//force oneTime test start
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SET_PERI_REG_MASK(SENS_SAR_TOUCH_CTRL2_REG, SENS_TOUCH_START_EN_M|SENS_TOUCH_START_FORCE_M);
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SET_PERI_REG_BITS(SENS_SAR_TOUCH_CTRL1_REG, SENS_TOUCH_XPD_WAIT, 10, SENS_TOUCH_XPD_WAIT_S);
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while (GET_PERI_REG_MASK(SENS_SAR_TOUCH_CTRL2_REG, SENS_TOUCH_MEAS_DONE) == 0) {};
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uint16_t touch_value = READ_PERI_REG(SENS_SAR_TOUCH_OUT1_REG + (pad / 2) * 4) >> ((pad & 1) ? SENS_TOUCH_MEAS_OUT1_S : SENS_TOUCH_MEAS_OUT0_S);
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//clear touch force ,select the Touch mode is Timer
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CLEAR_PERI_REG_MASK(SENS_SAR_TOUCH_CTRL2_REG, SENS_TOUCH_START_EN_M|SENS_TOUCH_START_FORCE_M);
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//restore previous value
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WRITE_PERI_REG(SENS_SAR_TOUCH_ENABLE_REG, v0);
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return touch_value;
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}
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void __touchAttachInterrupt(uint8_t pin, void (*userFunc)(void), uint16_t threshold)
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{
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int8_t pad = digitalPinToTouchChannel(pin);
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if(pad < 0){
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return;
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}
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pinMode(pin, ANALOG);
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__touchInit();
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__touchInterruptHandlers[pad] = userFunc;
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//clear touch force ,select the Touch mode is Timer
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CLEAR_PERI_REG_MASK(SENS_SAR_TOUCH_CTRL2_REG, SENS_TOUCH_START_EN_M|SENS_TOUCH_START_FORCE_M);
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//interrupt when touch value < threshold
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CLEAR_PERI_REG_MASK(SENS_SAR_TOUCH_CTRL1_REG, SENS_TOUCH_OUT_SEL);
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//Intr will give ,when SET0 < threshold
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SET_PERI_REG_MASK(SENS_SAR_TOUCH_CTRL1_REG, SENS_TOUCH_OUT_1EN);
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//Enable Rtc Touch Module Intr,the Interrupt need Rtc out Enable
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SET_PERI_REG_MASK(RTC_CNTL_INT_ENA_REG, RTC_CNTL_TOUCH_INT_ENA);
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//set threshold
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uint8_t shift = (pad & 1) ? SENS_TOUCH_OUT_TH1_S : SENS_TOUCH_OUT_TH0_S;
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SET_PERI_REG_BITS((SENS_SAR_TOUCH_THRES1_REG + (pad / 2) * 4), SENS_TOUCH_OUT_TH0, threshold, shift);
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uint32_t rtc_tio_reg = RTC_IO_TOUCH_PAD0_REG + pad * 4;
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WRITE_PERI_REG(rtc_tio_reg, (READ_PERI_REG(rtc_tio_reg)
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& ~(RTC_IO_TOUCH_PAD0_DAC_M))
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| (7 << RTC_IO_TOUCH_PAD0_DAC_S)//Touch Set Slope
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| RTC_IO_TOUCH_PAD0_TIE_OPT_M //Enable Tie,Init Level
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| RTC_IO_TOUCH_PAD0_START_M //Enable Touch Pad IO
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| RTC_IO_TOUCH_PAD0_XPD_M); //Enable Touch Pad Power on
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//Enable Digital rtc control :work mode and out mode
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SET_PERI_REG_MASK(SENS_SAR_TOUCH_ENABLE_REG,
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(1 << (pad + SENS_TOUCH_PAD_WORKEN_S)) | \
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(1 << (pad + SENS_TOUCH_PAD_OUTEN2_S)) | \
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(1 << (pad + SENS_TOUCH_PAD_OUTEN1_S)));
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}
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extern uint16_t touchRead(uint8_t pin) __attribute__ ((weak, alias("__touchRead")));
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extern void touchAttachInterrupt(uint8_t pin, void (*userFunc)(void), uint16_t threshold) __attribute__ ((weak, alias("__touchAttachInterrupt")));
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extern void touchSetCycles(uint16_t measure, uint16_t sleep) __attribute__ ((weak, alias("__touchSetCycles")));
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