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/*
* This file is part of the MicroPython project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2021 Jeff Epler 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 "py/obj.h"
#include "py/runtime.h"
#include "shared/runtime/context_manager_helpers.h"
#include "shared/runtime/interrupt_char.h"
#include "bindings/rp2pio/StateMachine.h"
#include "bindings/rp2pio/__init__.h"
#include "common-hal/imagecapture/ParallelImageCapture.h"
#include "shared-bindings/imagecapture/ParallelImageCapture.h"
#include "shared-bindings/microcontroller/Pin.h"
#include "shared-bindings/microcontroller/Processor.h"
#include "shared-bindings/microcontroller/__init__.h"
#include "src/rp2_common/hardware_pio/include/hardware/pio.h"
#include "src/rp2_common/hardware_pio/include/hardware/pio_instructions.h"
// Define this to (1), and you can scope the instruction-pointer of the state machine on D26..28 (note the weird encoding though!)
#define DEBUG_STATE_MACHINE (0)
#if DEBUG_STATE_MACHINE
#define SIDE(x) ((x) << 8)
#else
#define SIDE(x) (0)
#endif
#define _0 SIDE(0b11100)
#define _1 SIDE(0b00000)
#define _2 SIDE(0b10000)
#define _3 SIDE(0b10100)
#define _4 SIDE(0b11000)
#define _5 SIDE(0b10100)
#define IMAGECAPTURE_CODE(width, pclk, vsync, href) \
{ \
/* 0 */ pio_encode_wait_gpio(0, vsync) | _0, \
/* 1 */ pio_encode_wait_gpio(1, vsync) | _1, \
/* .wrap_target */ \
/* 2 */ pio_encode_wait_gpio(1, href) | _2, \
/* 3 */ pio_encode_wait_gpio(1, pclk) | _3, \
/* 4 */ pio_encode_in(pio_pins, width) | _4, \
/* 5 */ pio_encode_wait_gpio(0, pclk) | _5, \
/* .wrap */ \
}
STATIC mcu_pin_obj_t *pin_from_number(uint8_t number) {
const mp_map_t *mcu_map = &mcu_pin_globals.map;
for (uint8_t i = 0; i < mcu_map->alloc; i++) {
mp_obj_t val = mcu_map->table[i].value;
if (!mp_obj_is_type(val, &mcu_pin_type)) {
continue;
}
mcu_pin_obj_t *pin = MP_OBJ_TO_PTR(val);
if (pin->number == number) {
return pin;
}
}
return NULL;
}
void common_hal_imagecapture_parallelimagecapture_construct(imagecapture_parallelimagecapture_obj_t *self,
const uint8_t data_pins[],
uint8_t data_count,
const mcu_pin_obj_t *data_clock,
const mcu_pin_obj_t *vertical_sync,
const mcu_pin_obj_t *horizontal_reference) {
for (int i = 1; i < data_count; i++) {
if (data_pins[i] - data_pins[0] != i) {
mp_raise_RuntimeError(translate("Pins must be sequential"));
}
}
uint16_t imagecapture_code[] = IMAGECAPTURE_CODE(data_count, data_clock->number, vertical_sync->number, horizontal_reference->number);
common_hal_rp2pio_statemachine_construct(&self->state_machine,
imagecapture_code, MP_ARRAY_SIZE(imagecapture_code),
common_hal_mcu_processor_get_frequency(), // full speed (4 instructions per loop -> max pclk 30MHz @ 120MHz)
0, 0, // init
NULL, 0, 0, 0, // out pins
pin_from_number(data_pins[0]), data_count, // in pins
0, 0, // in pulls
NULL, 0, 0, 0, // set pins
#if DEBUG_STATE_MACHINE
&pin_GPIO26, 3, 7, 7, // sideset pins
#else
NULL, 0, 0, 0, // sideset pins
#endif
false, // No sideset enable
NULL, PULL_NONE, // jump pin
(1 << vertical_sync->number) | (1 << horizontal_reference->number) | (1 << data_clock->number), // wait gpio pins
true, // exclusive pin use
false, 32, false, // out settings
false, // wait for txstall
true, 32, true, // in settings
false, // Not user-interruptible.
2, 5); // wrap settings
PIO pio = self->state_machine.pio;
uint8_t pio_index = pio_get_index(pio);
uint sm = self->state_machine.state_machine;
}
void common_hal_imagecapture_parallelimagecapture_deinit(imagecapture_parallelimagecapture_obj_t *self) {
if (common_hal_imagecapture_parallelimagecapture_deinited(self)) {
return;
}
return common_hal_rp2pio_statemachine_deinit(&self->state_machine);
}
bool common_hal_imagecapture_parallelimagecapture_deinited(imagecapture_parallelimagecapture_obj_t *self) {
return common_hal_rp2pio_statemachine_deinited(&self->state_machine);
}
void common_hal_imagecapture_parallelimagecapture_singleshot_capture(imagecapture_parallelimagecapture_obj_t *self, mp_obj_t buffer) {
mp_buffer_info_t bufinfo;
mp_get_buffer_raise(buffer, &bufinfo, MP_BUFFER_RW);
PIO pio = self->state_machine.pio;
uint sm = self->state_machine.state_machine;
uint8_t offset = rp2pio_statemachine_program_offset(&self->state_machine);
pio_sm_set_enabled(pio, sm, false);
pio_sm_clear_fifos(pio, sm);
pio_sm_restart(pio, sm);
pio_sm_exec(pio, sm, pio_encode_jmp(offset));
pio_sm_set_enabled(pio, sm, true);
common_hal_rp2pio_statemachine_readinto(&self->state_machine, bufinfo.buf, bufinfo.len, 4, false);
pio_sm_set_enabled(pio, sm, false);
}
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