circuitpython/ports/atmel-samd/freetouch/adafruit_ptc.c

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/*
* FreeTouch, a QTouch-compatible library - tested on ATSAMD21 only!
* The MIT License (MIT)
*
* Copyright (c) 2017 Limor 'ladyada' Fried for Adafruit Industries
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include "adafruit_ptc.h"
#include "pinmux.h"
static void sync_config(Ptc const* module_inst) {
while (module_inst->CONTROLB.bit.SYNCFLAG) ;
}
void adafruit_ptc_get_config_default(struct adafruit_ptc_config *config) {
config->pin = 0xff;
config->yline = -1;
config->oversample = OVERSAMPLE_4;
config->seriesres = RESISTOR_0;
config->freqhop = FREQ_MODE_NONE;
config->compcap = 0x2000;
config->intcap = 0x3F;
}
void adafruit_ptc_init(Ptc* module_inst, struct adafruit_ptc_config const* config) {
struct system_pinmux_config pinmux_config;
system_pinmux_get_config_defaults(&pinmux_config);
pinmux_config.mux_position = 0x1;
pinmux_config.input_pull = SYSTEM_PINMUX_PIN_PULL_NONE;
system_pinmux_pin_set_config(config->pin, &pinmux_config);
sync_config(module_inst);
module_inst->CONTROLA.bit.ENABLE = 0;
sync_config(module_inst);
module_inst->UNK4C04.reg &= 0xF7; //MEMORY[0x42004C04] &= 0xF7u;
module_inst->UNK4C04.reg &= 0xFB; //MEMORY[0x42004C04] &= 0xFBu;
module_inst->UNK4C04.reg &= 0xFC; //MEMORY[0x42004C04] &= 0xFCu;
sync_config(module_inst);
module_inst->FREQCONTROL.reg &= 0x9F; //MEMORY[0x42004C0C] &= 0x9Fu;
sync_config(module_inst);
module_inst->FREQCONTROL.reg &= 0xEF; //MEMORY[0x42004C0C] &= 0xEFu;
sync_config(module_inst);
module_inst->FREQCONTROL.bit.SAMPLEDELAY = 0; //MEMORY[0x42004C0C] &= 0xF0u;
module_inst->CONTROLC.bit.INIT = 1; //MEMORY[0x42004C05] |= 1u;
module_inst->CONTROLA.bit.RUNINSTANDBY = 1; //MEMORY[0x42004C00] |= 4u;
sync_config(module_inst);
module_inst->INTDISABLE.bit.WCO = 1;
sync_config(module_inst);
module_inst->INTDISABLE.bit.EOC = 1;
sync_config(module_inst);
// enable the sensor, only done once per line
if (config->yline < 8) {
sync_config(module_inst);
module_inst->YENABLEL.reg |= 1 << config->yline;
sync_config(module_inst);
} else if (config->yline < 16) {
module_inst->YENABLEH.reg |= 1 << (config->yline - 8);
}
sync_config(module_inst);
module_inst->CONTROLA.bit.ENABLE = 1;
sync_config(module_inst);
}
void adafruit_ptc_start_conversion(Ptc* module_inst, struct adafruit_ptc_config const* config) {
module_inst->CONTROLA.bit.RUNINSTANDBY = 1;
sync_config(module_inst);
module_inst->CONTROLA.bit.ENABLE = 1;
sync_config(module_inst);
module_inst->INTDISABLE.bit.WCO = 1;
sync_config(module_inst);
module_inst->INTFLAGS.bit.WCO = 1;
sync_config(module_inst);
module_inst->INTFLAGS.bit.EOC = 1;
sync_config(module_inst);
// set up pin!
sync_config(module_inst);
if (config->yline < 8) {
module_inst->YSELECTL.reg = 1 << config->yline;
} else {
module_inst->YSELECTL.reg = 0;
}
if (config->yline > 7) {
module_inst->YSELECTH.reg = 1 << (config->yline - 8);
} else {
module_inst->YSELECTH.reg = 0;
}
sync_config(module_inst);
// set up sense resistor
module_inst->SERRES.bit.RESISTOR = config->seriesres;
sync_config(module_inst);
// set up prescalar
module_inst->CONVCONTROL.bit.ADCACCUM = config->oversample;
sync_config(module_inst);
// set up freq hopping
if (config->freqhop == FREQ_MODE_NONE) {
module_inst->FREQCONTROL.bit.FREQSPREADEN = 0;
module_inst->FREQCONTROL.bit.SAMPLEDELAY = 0;
} else {
module_inst->FREQCONTROL.bit.FREQSPREADEN = 1;
module_inst->FREQCONTROL.bit.SAMPLEDELAY = config->hops;
}
// set up compensation cap + int (?) cap
sync_config(module_inst);
module_inst->COMPCAPL.bit.VALUE = config->compcap & 0xFF;
module_inst->COMPCAPH.bit.VALUE = (config->compcap>>8) & 0x3F;
sync_config(module_inst);
module_inst->INTCAP.bit.VALUE = config->intcap & 0x3F;
sync_config(module_inst);
module_inst->BURSTMODE.reg = 0xA4;
sync_config(module_inst);
module_inst->CONVCONTROL.bit.CONVERT = 1;
sync_config(module_inst);
}
bool adafruit_ptc_is_conversion_finished(Ptc* module_inst) {
return module_inst->CONVCONTROL.bit.CONVERT == 0;
}
uint16_t adafruit_ptc_get_conversion_result(Ptc* module_inst) {
sync_config(module_inst);
return module_inst->RESULT.reg;
}