141 lines
4.4 KiB
C
141 lines
4.4 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) 2013, 2014 Damien P. George
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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 <stdint.h>
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#include <string.h>
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#include "py/mperrno.h"
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#include "py/runtime.h"
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#include "shared-bindings/analogio/AnalogOut.h"
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#include "shared-bindings/microcontroller/Pin.h"
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#include "atmel_start_pins.h"
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#include "hal/include/hal_dac_sync.h"
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#include "hpl/gclk/hpl_gclk_base.h"
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#include "peripheral_clk_config.h"
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#ifdef SAMD21
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#include "hpl/pm/hpl_pm_base.h"
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#endif
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void common_hal_analogio_analogout_construct(analogio_analogout_obj_t* self,
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const mcu_pin_obj_t *pin) {
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if (pin->pin != PIN_PA02
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#ifdef SAMD51
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&& pin->pin != PIN_PA05
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#endif
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) {
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mp_raise_ValueError("AnalogOut not supported on given pin");
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return;
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}
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self->channel = 0;
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#ifdef SAMD51
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if (pin->pin == PIN_PA05) {
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self->channel = 1;
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}
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#endif
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#ifdef SAMD51
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hri_mclk_set_APBDMASK_DAC_bit(MCLK);
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#endif
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#ifdef SAMD21
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_pm_enable_bus_clock(PM_BUS_APBC, DAC);
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#endif
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// SAMD21: This clock should be <= 12 MHz, per datasheet section 47.6.3.
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// SAMD51: This clock should be <= 350kHz, per datasheet table 37-6.
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_gclk_enable_channel(DAC_GCLK_ID, CONF_GCLK_DAC_SRC);
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// Don't double init the DAC on the SAMD51 when both outputs are in use. We use the free state
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// of each output pin to determine DAC state.
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int32_t result = ERR_NONE;
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#ifdef SAMD51
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if (!common_hal_mcu_pin_is_free(&pin_PA02) || !common_hal_mcu_pin_is_free(&pin_PA05)) {
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#endif
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// Fake the descriptor if the DAC is already initialized.
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self->descriptor.device.hw = DAC;
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#ifdef SAMD51
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} else {
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#endif
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result = dac_sync_init(&self->descriptor, DAC);
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#ifdef SAMD51
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}
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#endif
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if (result != ERR_NONE) {
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mp_raise_OSError(MP_EIO);
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return;
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}
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claim_pin(pin);
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gpio_set_pin_function(pin->pin, GPIO_PIN_FUNCTION_B);
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dac_sync_enable_channel(&self->descriptor, self->channel);
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}
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bool common_hal_analogio_analogout_deinited(analogio_analogout_obj_t *self) {
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return self->deinited;
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}
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void common_hal_analogio_analogout_deinit(analogio_analogout_obj_t *self) {
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if (common_hal_analogio_analogout_deinited(self)) {
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return;
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}
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dac_sync_disable_channel(&self->descriptor, self->channel);
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reset_pin(PIN_PA02);
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// Only deinit the DAC on the SAMD51 if both outputs are free.
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#ifdef SAMD51
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if (common_hal_mcu_pin_is_free(&pin_PA02) && common_hal_mcu_pin_is_free(&pin_PA05)) {
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#endif
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dac_sync_deinit(&self->descriptor);
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#ifdef SAMD51
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}
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#endif
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self->deinited = true;
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// TODO(tannewt): Turn off the DAC clocks to save power.
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}
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void common_hal_analogio_analogout_set_value(analogio_analogout_obj_t *self,
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uint16_t value) {
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// Input is 16 bit so make sure and set LEFTADJ to 1 so it takes the top
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// bits. This is currently done in asf4_conf/*/hpl_dac_config.h.
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dac_sync_write(&self->descriptor, self->channel, &value, 1);
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}
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void analogout_reset(void) {
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#ifdef SAMD21
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while (DAC->STATUS.reg & DAC_STATUS_SYNCBUSY) {}
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#endif
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#ifdef SAMD51
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while (DAC->SYNCBUSY.reg & DAC_SYNCBUSY_SWRST) {}
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#endif
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DAC->CTRLA.reg |= DAC_CTRLA_SWRST;
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// TODO(tannewt): Turn off the DAC clocks to save power.
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}
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