// Copyright 2015-2016 Espressif Systems (Shanghai) PTE LTD // // Licensed under the Apache License, Version 2.0 (the "License"); // you may not use this file except in compliance with the License. // You may obtain a copy of the License at // http://www.apache.org/licenses/LICENSE-2.0 // // Unless required by applicable law or agreed to in writing, software // distributed under the License is distributed on an "AS IS" BASIS, // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. // See the License for the specific language governing permissions and // limitations under the License. #include "esp32-hal-touch.h" #include "freertos/FreeRTOS.h" #include "freertos/task.h" #include "rom/ets_sys.h" #include "esp_attr.h" #include "esp_intr.h" #include "soc/rtc_io_reg.h" #include "soc/rtc_cntl_reg.h" #include "soc/sens_reg.h" #define RTC_TOUCH_INUM 5 static uint16_t __touchSleepCycles = 0x1000; static uint16_t __touchMeasureCycles = 0x1000; typedef void (*voidFuncPtr)(void); static voidFuncPtr __touchInterruptHandlers[10] = {0,}; void IRAM_ATTR __touchISR(void * arg) { uint32_t pad_intr = READ_PERI_REG(SENS_SAR_TOUCH_CTRL2_REG) & 0x3ff; uint32_t rtc_intr = READ_PERI_REG(RTC_CNTL_INT_ST_REG); uint8_t i = 0; //clear interrupt WRITE_PERI_REG(RTC_CNTL_INT_CLR_REG, rtc_intr); SET_PERI_REG_MASK(SENS_SAR_TOUCH_CTRL2_REG, SENS_TOUCH_MEAS_EN_CLR); if (rtc_intr & RTC_CNTL_TOUCH_INT_ST) { for (i = 0; i < 10; ++i) { if ((pad_intr >> i) & 0x01) { if(__touchInterruptHandlers[i]){ __touchInterruptHandlers[i](); } } } } } void __touchSetCycles(uint16_t measure, uint16_t sleep) { __touchSleepCycles = sleep; __touchMeasureCycles = measure; //Touch pad SleepCycle Time SET_PERI_REG_BITS(SENS_SAR_TOUCH_CTRL2_REG, SENS_TOUCH_SLEEP_CYCLES, __touchSleepCycles, SENS_TOUCH_SLEEP_CYCLES_S); //Touch Pad Measure Time SET_PERI_REG_BITS(SENS_SAR_TOUCH_CTRL1_REG, SENS_TOUCH_MEAS_DELAY, __touchMeasureCycles, SENS_TOUCH_MEAS_DELAY_S); } void __touchInit() { static bool initialized = false; if(initialized){ return; } SET_PERI_REG_BITS(RTC_IO_TOUCH_CFG_REG, RTC_IO_TOUCH_XPD_BIAS, 1, RTC_IO_TOUCH_XPD_BIAS_S); SET_PERI_REG_MASK(SENS_SAR_TOUCH_CTRL2_REG, SENS_TOUCH_MEAS_EN_CLR); //clear touch enable WRITE_PERI_REG(SENS_SAR_TOUCH_ENABLE_REG, 0x0); SET_PERI_REG_MASK(RTC_CNTL_STATE0_REG, RTC_CNTL_TOUCH_SLP_TIMER_EN); __touchSetCycles(__touchMeasureCycles, __touchSleepCycles); ESP_INTR_DISABLE(RTC_TOUCH_INUM); intr_matrix_set(xPortGetCoreID(), ETS_RTC_CORE_INTR_SOURCE, RTC_TOUCH_INUM); xt_set_interrupt_handler(RTC_TOUCH_INUM, &__touchISR, NULL); ESP_INTR_ENABLE(RTC_TOUCH_INUM); initialized = true; } uint16_t __touchRead(uint8_t pin) { int8_t pad = digitalPinToTouchChannel(pin); if(pad < 0){ return 0; } pinMode(pin, ANALOG); __touchInit(); uint32_t v0 = READ_PERI_REG(SENS_SAR_TOUCH_ENABLE_REG); //Disable Intr & enable touch pad WRITE_PERI_REG(SENS_SAR_TOUCH_ENABLE_REG, (v0 & ~((1 << (pad + SENS_TOUCH_PAD_OUTEN2_S)) | (1 << (pad + SENS_TOUCH_PAD_OUTEN1_S)))) | (1 << (pad + SENS_TOUCH_PAD_WORKEN_S))); SET_PERI_REG_MASK(SENS_SAR_TOUCH_ENABLE_REG, (1 << (pad + SENS_TOUCH_PAD_WORKEN_S))); uint32_t rtc_tio_reg = RTC_IO_TOUCH_PAD0_REG + pad * 4; WRITE_PERI_REG(rtc_tio_reg, (READ_PERI_REG(rtc_tio_reg) & ~(RTC_IO_TOUCH_PAD0_DAC_M)) | (7 << RTC_IO_TOUCH_PAD0_DAC_S)//Touch Set Slope | RTC_IO_TOUCH_PAD0_TIE_OPT_M //Enable Tie,Init Level | RTC_IO_TOUCH_PAD0_START_M //Enable Touch Pad IO | RTC_IO_TOUCH_PAD0_XPD_M); //Enable Touch Pad Power on //force oneTime test start SET_PERI_REG_MASK(SENS_SAR_TOUCH_CTRL2_REG, SENS_TOUCH_START_EN_M|SENS_TOUCH_START_FORCE_M); SET_PERI_REG_BITS(SENS_SAR_TOUCH_CTRL1_REG, SENS_TOUCH_XPD_WAIT, 10, SENS_TOUCH_XPD_WAIT_S); while (GET_PERI_REG_MASK(SENS_SAR_TOUCH_CTRL2_REG, SENS_TOUCH_MEAS_DONE) == 0) {}; 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); //clear touch force ,select the Touch mode is Timer CLEAR_PERI_REG_MASK(SENS_SAR_TOUCH_CTRL2_REG, SENS_TOUCH_START_EN_M|SENS_TOUCH_START_FORCE_M); //restore previous value WRITE_PERI_REG(SENS_SAR_TOUCH_ENABLE_REG, v0); return touch_value; } void __touchAttachInterrupt(uint8_t pin, void (*userFunc)(void), uint16_t threshold) { int8_t pad = digitalPinToTouchChannel(pin); if(pad < 0){ return; } pinMode(pin, ANALOG); __touchInit(); __touchInterruptHandlers[pad] = userFunc; //clear touch force ,select the Touch mode is Timer CLEAR_PERI_REG_MASK(SENS_SAR_TOUCH_CTRL2_REG, SENS_TOUCH_START_EN_M|SENS_TOUCH_START_FORCE_M); //interrupt when touch value < threshold CLEAR_PERI_REG_MASK(SENS_SAR_TOUCH_CTRL1_REG, SENS_TOUCH_OUT_SEL); //Intr will give ,when SET0 < threshold SET_PERI_REG_MASK(SENS_SAR_TOUCH_CTRL1_REG, SENS_TOUCH_OUT_1EN); //Enable Rtc Touch Module Intr,the Interrupt need Rtc out Enable SET_PERI_REG_MASK(RTC_CNTL_INT_ENA_REG, RTC_CNTL_TOUCH_INT_ENA); //set threshold uint8_t shift = (pad & 1) ? SENS_TOUCH_OUT_TH1_S : SENS_TOUCH_OUT_TH0_S; SET_PERI_REG_BITS((SENS_SAR_TOUCH_THRES1_REG + (pad / 2) * 4), SENS_TOUCH_OUT_TH0, threshold, shift); uint32_t rtc_tio_reg = RTC_IO_TOUCH_PAD0_REG + pad * 4; WRITE_PERI_REG(rtc_tio_reg, (READ_PERI_REG(rtc_tio_reg) & ~(RTC_IO_TOUCH_PAD0_DAC_M)) | (7 << RTC_IO_TOUCH_PAD0_DAC_S)//Touch Set Slope | RTC_IO_TOUCH_PAD0_TIE_OPT_M //Enable Tie,Init Level | RTC_IO_TOUCH_PAD0_START_M //Enable Touch Pad IO | RTC_IO_TOUCH_PAD0_XPD_M); //Enable Touch Pad Power on //Enable Digital rtc control :work mode and out mode SET_PERI_REG_MASK(SENS_SAR_TOUCH_ENABLE_REG, (1 << (pad + SENS_TOUCH_PAD_WORKEN_S)) | \ (1 << (pad + SENS_TOUCH_PAD_OUTEN2_S)) | \ (1 << (pad + SENS_TOUCH_PAD_OUTEN1_S))); } extern uint16_t touchRead(uint8_t pin) __attribute__ ((weak, alias("__touchRead"))); extern void touchAttachInterrupt(uint8_t pin, void (*userFunc)(void), uint16_t threshold) __attribute__ ((weak, alias("__touchAttachInterrupt"))); extern void touchSetCycles(uint16_t measure, uint16_t sleep) __attribute__ ((weak, alias("__touchSetCycles")));