diff options
Diffstat (limited to 'circuitpython/ports/raspberrypi/common-hal/paralleldisplay/ParallelBus.c')
| -rw-r--r-- | circuitpython/ports/raspberrypi/common-hal/paralleldisplay/ParallelBus.c | 170 |
1 files changed, 170 insertions, 0 deletions
diff --git a/circuitpython/ports/raspberrypi/common-hal/paralleldisplay/ParallelBus.c b/circuitpython/ports/raspberrypi/common-hal/paralleldisplay/ParallelBus.c new file mode 100644 index 0000000..96c89ad --- /dev/null +++ b/circuitpython/ports/raspberrypi/common-hal/paralleldisplay/ParallelBus.c @@ -0,0 +1,170 @@ +/* + * This file is part of the MicroPython project, http://micropython.org/ + * + * The MIT License (MIT) + * + * Copyright (c) 2021 Scott Shawcroft 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 "shared-bindings/paralleldisplay/ParallelBus.h" + +#include <stdint.h> + +#include "common-hal/microcontroller/Pin.h" +#include "py/runtime.h" +#include "shared-bindings/digitalio/DigitalInOut.h" +#include "shared-bindings/microcontroller/__init__.h" +#include "bindings/rp2pio/StateMachine.h" +#include "common-hal/rp2pio/StateMachine.h" + +static const uint16_t parallel_program[] = { +// .side_set 1 +// .wrap_target + 0x6008, // out pins, 8 side 0 + 0xB042 // nop side 1 +// .wrap +}; + +void common_hal_paralleldisplay_parallelbus_construct(paralleldisplay_parallelbus_obj_t *self, + const mcu_pin_obj_t *data0, const mcu_pin_obj_t *command, const mcu_pin_obj_t *chip_select, + const mcu_pin_obj_t *write, const mcu_pin_obj_t *read, const mcu_pin_obj_t *reset, uint32_t frequency) { + + uint8_t data_pin = data0->number; + for (uint8_t i = 0; i < 8; i++) { + if (!pin_number_is_free(data_pin + i)) { + mp_raise_ValueError_varg(translate("Bus pin %d is already in use"), i); + } + } + + uint8_t write_pin = write->number; + if (!pin_number_is_free(write_pin)) { + mp_raise_ValueError_varg(translate("Bus pin %d is already in use"), write_pin); + } + + self->command.base.type = &digitalio_digitalinout_type; + common_hal_digitalio_digitalinout_construct(&self->command, command); + common_hal_digitalio_digitalinout_switch_to_output(&self->command, true, DRIVE_MODE_PUSH_PULL); + + self->chip_select.base.type = &digitalio_digitalinout_type; + common_hal_digitalio_digitalinout_construct(&self->chip_select, chip_select); + common_hal_digitalio_digitalinout_switch_to_output(&self->chip_select, true, DRIVE_MODE_PUSH_PULL); + + self->read.base.type = &mp_type_NoneType; + if (read != NULL) { + self->read.base.type = &digitalio_digitalinout_type; + common_hal_digitalio_digitalinout_construct(&self->read, read); + common_hal_digitalio_digitalinout_switch_to_output(&self->read, true, DRIVE_MODE_PUSH_PULL); + never_reset_pin_number(read->number); + } + + self->data0_pin = data_pin; + self->write = write_pin; + + self->reset.base.type = &mp_type_NoneType; + if (reset != NULL) { + self->reset.base.type = &digitalio_digitalinout_type; + common_hal_digitalio_digitalinout_construct(&self->reset, reset); + common_hal_digitalio_digitalinout_switch_to_output(&self->reset, true, DRIVE_MODE_PUSH_PULL); + never_reset_pin_number(reset->number); + common_hal_paralleldisplay_parallelbus_reset(self); + } + + never_reset_pin_number(command->number); + never_reset_pin_number(chip_select->number); + never_reset_pin_number(write_pin); + for (uint8_t i = 0; i < 8; i++) { + never_reset_pin_number(data_pin + i); + } + + common_hal_rp2pio_statemachine_construct(&self->state_machine, + parallel_program, MP_ARRAY_SIZE(parallel_program), + frequency * 2, // frequency multiplied by 2 as 2 PIO instructions + NULL, 0, // init + data0, 8, 0, 255, // first out pin, # out pins + NULL, 0, 0, 0, // first in pin, # in pins + NULL, 0, 0, 0, // first set pin + write, 1, 0, 1, // first sideset pin + false, // No sideset enable + NULL, PULL_NONE, // jump pin + 0, // wait gpio pins + true, // exclusive pin usage + true, 8, true, // TX, auto pull every 8 bits. shift left to output msb first + false, // wait for TX stall + false, 32, true, // RX setting we don't use + false, // Not user-interruptible. + 0, -1); // wrap settings + + common_hal_rp2pio_statemachine_never_reset(&self->state_machine); +} + +void common_hal_paralleldisplay_parallelbus_deinit(paralleldisplay_parallelbus_obj_t *self) { + common_hal_rp2pio_statemachine_deinit(&self->state_machine); + + for (uint8_t i = 0; i < 8; i++) { + reset_pin_number(self->data0_pin + i); + } + + reset_pin_number(self->command.pin->number); + reset_pin_number(self->chip_select.pin->number); + reset_pin_number(self->write); + if (self->read.base.type != &mp_type_NoneType) { + reset_pin_number(self->read.pin->number); + } + if (self->reset.base.type != &mp_type_NoneType) { + reset_pin_number(self->reset.pin->number); + } +} + +bool common_hal_paralleldisplay_parallelbus_reset(mp_obj_t obj) { + paralleldisplay_parallelbus_obj_t *self = MP_OBJ_TO_PTR(obj); + if (self->reset.base.type == &mp_type_NoneType) { + return false; + } + + common_hal_digitalio_digitalinout_set_value(&self->reset, false); + common_hal_mcu_delay_us(4); + common_hal_digitalio_digitalinout_set_value(&self->reset, true); + return true; +} + +bool common_hal_paralleldisplay_parallelbus_bus_free(mp_obj_t obj) { + return true; +} + +bool common_hal_paralleldisplay_parallelbus_begin_transaction(mp_obj_t obj) { + paralleldisplay_parallelbus_obj_t *self = MP_OBJ_TO_PTR(obj); + common_hal_digitalio_digitalinout_set_value(&self->chip_select, false); + return true; +} + +void common_hal_paralleldisplay_parallelbus_send(mp_obj_t obj, display_byte_type_t byte_type, + display_chip_select_behavior_t chip_select, const uint8_t *data, uint32_t data_length) { + + paralleldisplay_parallelbus_obj_t *self = MP_OBJ_TO_PTR(obj); + + common_hal_digitalio_digitalinout_set_value(&self->command, byte_type == DISPLAY_DATA); + common_hal_rp2pio_statemachine_write(&self->state_machine, data, data_length, 1, false); +} + +void common_hal_paralleldisplay_parallelbus_end_transaction(mp_obj_t obj) { + paralleldisplay_parallelbus_obj_t *self = MP_OBJ_TO_PTR(obj); + common_hal_digitalio_digitalinout_set_value(&self->chip_select, true); +} |