130 lines
5.4 KiB
C
130 lines
5.4 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) 2018 Scott Shawcroft for Adafruit Industries
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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 "shared-bindings/displayio/ParallelBus.h"
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#include <stdint.h>
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#include "common-hal/microcontroller/Pin.h"
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#include "py/runtime.h"
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#include "shared-bindings/digitalio/DigitalInOut.h"
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#include "tick.h"
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void common_hal_displayio_parallelbus_construct(displayio_parallelbus_obj_t* self,
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const mcu_pin_obj_t* data0, const mcu_pin_obj_t* command, const mcu_pin_obj_t* chip_select,
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const mcu_pin_obj_t* write, const mcu_pin_obj_t* read, const mcu_pin_obj_t* reset) {
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uint8_t data_pin = data0->number;
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if (data_pin % 8 != 0) {
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mp_raise_ValueError(translate("Data 0 pin must be byte aligned"));
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}
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for (uint8_t i = 0; i < 8; i++) {
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if (!pin_number_is_free(data_pin + i)) {
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mp_raise_ValueError_varg(translate("Bus pin %d is already in use"), i);
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}
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}
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PortGroup *const g = &PORT->Group[data0->number / 32];
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g->DIRSET.reg = 0xff << (data_pin % 32);
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uint32_t wrconfig = PORT_WRCONFIG_WRPINCFG | PORT_WRCONFIG_DRVSTR;
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if (data_pin % 32 > 15) {
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wrconfig |= PORT_WRCONFIG_HWSEL | (0xff << ((data_pin % 32) - 16));
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} else {
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wrconfig |= 0xff << (data_pin % 32);
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}
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g->WRCONFIG.reg = wrconfig;
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self->bus = ((uint8_t*) &g->OUT.reg) + (data0->number % 32 / 8);
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self->command.base.type = &digitalio_digitalinout_type;
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common_hal_digitalio_digitalinout_construct(&self->command, command);
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common_hal_digitalio_digitalinout_switch_to_output(&self->command, true, DRIVE_MODE_PUSH_PULL);
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self->chip_select.base.type = &digitalio_digitalinout_type;
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common_hal_digitalio_digitalinout_construct(&self->chip_select, chip_select);
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common_hal_digitalio_digitalinout_switch_to_output(&self->chip_select, true, DRIVE_MODE_PUSH_PULL);
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self->reset.base.type = &digitalio_digitalinout_type;
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common_hal_digitalio_digitalinout_construct(&self->reset, reset);
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common_hal_digitalio_digitalinout_switch_to_output(&self->reset, true, DRIVE_MODE_PUSH_PULL);
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self->write.base.type = &digitalio_digitalinout_type;
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common_hal_digitalio_digitalinout_construct(&self->write, write);
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common_hal_digitalio_digitalinout_switch_to_output(&self->write, true, DRIVE_MODE_PUSH_PULL);
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self->read.base.type = &digitalio_digitalinout_type;
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common_hal_digitalio_digitalinout_construct(&self->read, read);
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common_hal_digitalio_digitalinout_switch_to_output(&self->read, true, DRIVE_MODE_PUSH_PULL);
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self->data0_pin = data_pin;
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self->write_group = &PORT->Group[write->number / 32];
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self->write_mask = 1 << (write->number % 32);
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never_reset_pin_number(command->number);
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never_reset_pin_number(chip_select->number);
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never_reset_pin_number(write->number);
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never_reset_pin_number(read->number);
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never_reset_pin_number(reset->number);
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for (uint8_t i = 0; i < 8; i++) {
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never_reset_pin_number(data_pin + i);
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}
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}
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void common_hal_displayio_parallelbus_deinit(displayio_parallelbus_obj_t* self) {
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for (uint8_t i = 0; i < 8; i++) {
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reset_pin_number(self->data0_pin + i);
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}
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reset_pin_number(self->command.pin->number);
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reset_pin_number(self->chip_select.pin->number);
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reset_pin_number(self->write.pin->number);
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reset_pin_number(self->read.pin->number);
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reset_pin_number(self->reset.pin->number);
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}
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bool common_hal_displayio_parallelbus_begin_transaction(mp_obj_t obj) {
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displayio_parallelbus_obj_t* self = MP_OBJ_TO_PTR(obj);
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common_hal_digitalio_digitalinout_set_value(&self->chip_select, false);
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return true;
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}
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void common_hal_displayio_parallelbus_send(mp_obj_t obj, bool command, uint8_t *data, uint32_t data_length) {
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displayio_parallelbus_obj_t* self = MP_OBJ_TO_PTR(obj);
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common_hal_digitalio_digitalinout_set_value(&self->command, !command);
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uint32_t* clear_write = (uint32_t*) &self->write_group->OUTCLR.reg;
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uint32_t* set_write = (uint32_t*) &self->write_group->OUTSET.reg;
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uint32_t mask = self->write_mask;
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for (uint32_t i = 0; i < data_length; i++) {
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*clear_write = mask;
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*self->bus = data[i];
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*set_write = mask;
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}
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}
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void common_hal_displayio_parallelbus_end_transaction(mp_obj_t obj) {
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displayio_parallelbus_obj_t* self = MP_OBJ_TO_PTR(obj);
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common_hal_digitalio_digitalinout_set_value(&self->chip_select, true);
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}
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