126 lines
4.5 KiB
C
126 lines
4.5 KiB
C
/*
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* This file is part of the MicroPython project, http://micropython.org/
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*
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* The MIT License (MIT)
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*
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* Copyright (c) 2022 Robert Hammelrath
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*
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* This file provides and checks pin capabilities as required
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* for USART, I2C, SPI, PWM, ADC
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*
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*/
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#include <stdint.h>
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#include "py/runtime.h"
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#include "py/misc.h"
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#include "pin_af.h"
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#include "sam.h"
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extern const uint8_t tcc_channel_count[];
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#include PIN_AF_TABLE_C
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// Just look for an table entry for a given pin and raise an error
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// in case of no match (which should not happen).
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const pin_af_t *get_pin_af_info(int pin_id) {
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for (int i = 0; i < MP_ARRAY_SIZE(pin_af_table); i++) {
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if (pin_af_table[i].pin_id == pin_id) { // Pin match
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return &pin_af_table[i];
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}
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}
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mp_raise_ValueError(MP_ERROR_TEXT("wrong pin"));
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}
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// Test, wether the given pin is defined and has signals for sercom.
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// If that applies return the alt_fct and pad_nr.
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// If not, an error will be raised.
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sercom_pad_config_t get_sercom_config(int pin_id, uint8_t sercom_nr) {
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const pin_af_t *pct_ptr = get_pin_af_info(pin_id);
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if ((pct_ptr->sercom1 >> 4) == sercom_nr) {
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return (sercom_pad_config_t) {ALT_FCT_SERCOM1, pct_ptr->sercom1 & 0x0f};
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} else if ((pct_ptr->sercom2 >> 4) == sercom_nr) {
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return (sercom_pad_config_t) {ALT_FCT_SERCOM2, pct_ptr->sercom2 & 0x0f};
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} else {
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mp_raise_ValueError(MP_ERROR_TEXT("wrong serial device"));
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}
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}
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// Test, wether the given pin is defined as ADC.
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// If that applies return the adc instance and channel.
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// If not, an error will be raised.
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adc_config_t get_adc_config(int pin_id, int32_t flag) {
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const pin_af_t *pct_ptr = get_pin_af_info(pin_id);
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if (pct_ptr->adc0 != 0xff && (flag & (1 << pct_ptr->adc0)) == 0) {
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return (adc_config_t) {0, pct_ptr->adc0};
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#if defined(MUC_SAMD51)
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} else if (pct_ptr->adc1 != 0xff && (flag & (1 << (pct_ptr->adc1 + 16))) == 0) {
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return (adc_config_t) {1, pct_ptr->adc1};
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#endif
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} else {
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mp_raise_ValueError(MP_ERROR_TEXT("ADC pin used"));
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}
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}
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// Test, wether the given pin is defined and has signals for pwm.
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// If that applies return the alt_fct, tcc number and channel number.
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// If not, an error will be raised.
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// The function either supplies a channel from a wanted device, or
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// tries to provide an unused device, if available.
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pwm_config_t get_pwm_config(int pin_id, int wanted_dev, uint8_t device_status[]) {
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const pin_af_t *pct_ptr = get_pin_af_info(pin_id);
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uint8_t tcc1 = pct_ptr->tcc1;
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uint8_t tcc2 = pct_ptr->tcc2;
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if (wanted_dev != -1) {
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if ((tcc1 >> 4) == wanted_dev) {
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return (pwm_config_t) {ALT_FCT_TCC1, tcc1};
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} else if ((tcc2 >> 4) == wanted_dev) {
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return (pwm_config_t) {ALT_FCT_TCC2, tcc2};
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} else {
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mp_raise_ValueError(MP_ERROR_TEXT("wrong device or channel"));
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}
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} else {
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pwm_config_t ret = {};
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if ((tcc1 >> 4) < TCC_INST_NUM) {
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ret = (pwm_config_t) {ALT_FCT_TCC1, tcc1};
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if (tcc2 == 0xff) {
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return ret;
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}
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}
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if ((tcc2 >> 4) < TCC_INST_NUM) {
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// if a device in slot 1 is not available or already in use, use the one in slot 2
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if (tcc1 == 0xff || device_status[(ret.device_channel >> 4)] != 0) {
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return (pwm_config_t) {ALT_FCT_TCC2, tcc2};
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} else {
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return ret;
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}
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} else {
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mp_raise_ValueError(MP_ERROR_TEXT("not a PWM pin"));
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}
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}
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}
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