kopia lustrzana https://github.com/micropython/micropython
191 wiersze
5.8 KiB
C
191 wiersze
5.8 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) 2017 Nick Moore
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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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#include "py/runtime.h"
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#if MICROPY_PY_MACHINE_DAC
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#include <stdint.h>
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#include "py/obj.h"
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#include "py/mphal.h"
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#include "sam.h"
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#include "pin_af.h"
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#include "modmachine.h"
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typedef struct _dac_obj_t {
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mp_obj_base_t base;
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uint8_t id;
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mp_hal_pin_obj_t gpio_id;
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uint8_t vref;
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} dac_obj_t;
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static dac_obj_t dac_obj[] = {
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#if defined(MCU_SAMD21)
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{{&machine_dac_type}, 0, PIN_PA02},
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#elif defined(MCU_SAMD51)
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{{&machine_dac_type}, 0, PIN_PA02},
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{{&machine_dac_type}, 1, PIN_PA05},
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#endif
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};
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Dac *const dac_bases[] = DAC_INSTS;
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#if defined(MCU_SAMD21)
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#define MAX_DAC_VALUE (1023)
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#define DEFAULT_DAC_VREF (1)
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#define MAX_DAC_VREF (2)
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#elif defined(MCU_SAMD51)
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// According to Errata 2.9.2, VDDANA as ref value is not available. However it worked
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// in tests. So I keep the selection here but set the default to Aref, which is usually
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// connected at the Board to VDDANA
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static uint8_t dac_vref_table[] = {
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DAC_CTRLB_REFSEL_INTREF_Val, DAC_CTRLB_REFSEL_VDDANA_Val,
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DAC_CTRLB_REFSEL_VREFPU_Val, DAC_CTRLB_REFSEL_VREFPB_Val
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};
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#define MAX_DAC_VALUE (4095)
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#define DEFAULT_DAC_VREF (2)
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#define MAX_DAC_VREF (3)
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static bool dac_init = false;
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#endif
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static mp_obj_t dac_make_new(const mp_obj_type_t *type, size_t n_args, size_t n_kw,
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const mp_obj_t *all_args) {
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enum { ARG_id, ARG_vref };
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static const mp_arg_t allowed_args[] = {
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{ MP_QSTR_id, MP_ARG_REQUIRED | MP_ARG_INT, {.u_int = 0} },
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{ MP_QSTR_vref, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = DEFAULT_DAC_VREF} },
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};
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// Parse the arguments.
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mp_arg_val_t args[MP_ARRAY_SIZE(allowed_args)];
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mp_arg_parse_all_kw_array(n_args, n_kw, all_args, MP_ARRAY_SIZE(allowed_args), allowed_args, args);
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uint8_t id = args[ARG_id].u_int;
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dac_obj_t *self = NULL;
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if (0 <= id && id <= MP_ARRAY_SIZE(dac_obj)) {
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self = &dac_obj[id];
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} else {
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mp_raise_ValueError(MP_ERROR_TEXT("invalid Pin for DAC"));
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}
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uint8_t vref = args[ARG_vref].u_int;
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if (0 <= vref && vref <= MAX_DAC_VREF) {
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self->vref = vref;
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}
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Dac *dac = dac_bases[0]; // Just one DAC
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// Init DAC
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#if defined(MCU_SAMD21)
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// Configuration SAMD21
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// Enable APBC clocks and PCHCTRL clocks; GCLK3 at 1 MHz
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PM->APBCMASK.reg |= PM_APBCMASK_DAC;
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GCLK->CLKCTRL.reg = GCLK_CLKCTRL_CLKEN | GCLK_CLKCTRL_GEN_GCLK3 | GCLK_CLKCTRL_ID_DAC;
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while (GCLK->STATUS.bit.SYNCBUSY) {
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}
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// Reset DAC registers
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dac->CTRLA.bit.SWRST = 1;
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while (dac->CTRLA.bit.SWRST) {
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}
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dac->CTRLB.reg = DAC_CTRLB_EOEN | DAC_CTRLB_REFSEL(self->vref);
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// Enable DAC and wait to be ready
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dac->CTRLA.bit.ENABLE = 1;
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while (dac->STATUS.bit.SYNCBUSY) {
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}
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#elif defined(MCU_SAMD51)
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// Configuration SAMD51
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// Enable APBD clocks and PCHCTRL clocks; GCLK3 at 8 MHz
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dac_init = true;
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MCLK->APBDMASK.reg |= MCLK_APBDMASK_DAC;
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GCLK->PCHCTRL[DAC_GCLK_ID].reg = GCLK_PCHCTRL_GEN_GCLK3 | GCLK_PCHCTRL_CHEN;
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// Reset DAC registers
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dac->CTRLA.bit.SWRST = 1;
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while (dac->CTRLA.bit.SWRST) {
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}
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dac->CTRLB.reg = DAC_CTRLB_REFSEL(dac_vref_table[self->vref]);
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dac->DACCTRL[self->id].reg = DAC_DACCTRL_ENABLE | DAC_DACCTRL_REFRESH(2) | DAC_DACCTRL_CCTRL_CC12M;
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// Enable DAC and wait to be ready
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dac->CTRLA.bit.ENABLE = 1;
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while (dac->SYNCBUSY.bit.ENABLE) {
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}
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#endif
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// Set the port as given in self->gpio_id as DAC
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mp_hal_set_pin_mux(self->gpio_id, ALT_FCT_DAC);
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return MP_OBJ_FROM_PTR(self);
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}
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static void dac_print(const mp_print_t *print, mp_obj_t self_in, mp_print_kind_t kind) {
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dac_obj_t *self = self_in;
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mp_printf(print, "DAC(%u, Pin=%q, vref=%d)", self->id, pin_find_by_id(self->gpio_id)->name, self->vref);
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}
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static mp_obj_t dac_write(mp_obj_t self_in, mp_obj_t value_in) {
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Dac *dac = dac_bases[0]; // Just one DAC
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int value = mp_obj_get_int(value_in);
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if (value < 0 || value > MAX_DAC_VALUE) {
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mp_raise_ValueError(MP_ERROR_TEXT("value out of range"));
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}
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#if defined(MCU_SAMD21)
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dac->DATA.reg = value;
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#elif defined(MCU_SAMD51)
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dac_obj_t *self = self_in;
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dac->DATA[self->id].reg = value;
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#endif
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return mp_const_none;
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}
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MP_DEFINE_CONST_FUN_OBJ_2(dac_write_obj, dac_write);
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static const mp_rom_map_elem_t dac_locals_dict_table[] = {
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{ MP_ROM_QSTR(MP_QSTR_write), MP_ROM_PTR(&dac_write_obj) },
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};
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static MP_DEFINE_CONST_DICT(dac_locals_dict, dac_locals_dict_table);
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MP_DEFINE_CONST_OBJ_TYPE(
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machine_dac_type,
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MP_QSTR_DAC,
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MP_TYPE_FLAG_NONE,
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make_new, dac_make_new,
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print, dac_print,
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locals_dict, &dac_locals_dict
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);
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#endif
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