196 lines
7.3 KiB
C
196 lines
7.3 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) 2021 Jeff Epler 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 "py/obj.h"
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#include "py/runtime.h"
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#include "lib/utils/context_manager_helpers.h"
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#include "lib/utils/interrupt_char.h"
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#include "shared-bindings/imagecapture/ParallelImageCapture.h"
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#include "shared-bindings/microcontroller/__init__.h"
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#include "shared-bindings/microcontroller/Pin.h"
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#include "common-hal/imagecapture/ParallelImageCapture.h"
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#include "hal/include/hal_gpio.h"
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#include "atmel_start_pins.h"
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#include "audio_dma.h"
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#include "samd/clocks.h"
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#include "samd/events.h"
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#define GPIO_PIN_FUNCTION_PCC (GPIO_PIN_FUNCTION_K)
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#define PIN_PCC_D0 (PIN_PA16)
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#define PIN_PCC_DEN1 (PIN_PA12)
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#define PIN_PCC_DEN2 (PIN_PA13)
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#define PIN_PCC_CLK (PIN_PA14)
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void common_hal_imagecapture_parallelimagecapture_construct(imagecapture_parallelimagecapture_obj_t *self,
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const uint8_t data_pins[],
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uint8_t data_count,
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const mcu_pin_obj_t *data_clock,
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const mcu_pin_obj_t *vertical_sync,
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const mcu_pin_obj_t *horizontal_reference) {
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for (int i = 0; i < data_count; i++) {
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if (data_pins[i] != PIN_PCC_D0 + i) {
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mp_raise_ValueError_varg(translate("Invalid data_pins[%d]"), i);
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}
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}
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// The peripheral supports 8, 10, 12, or 14 data bits, but the code only supports 8 at present
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if (data_count != 8) {
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mp_raise_ValueError_varg(translate("Invalid data_count %d"), data_count);
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}
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if (vertical_sync && vertical_sync->number != PIN_PCC_DEN1) {
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mp_raise_ValueError_varg(translate("Invalid %q pin"), MP_QSTR_vsync);
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}
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if (horizontal_reference && horizontal_reference->number != PIN_PCC_DEN2) {
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mp_raise_ValueError_varg(translate("Invalid %q pin"), MP_QSTR_href);
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}
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if (data_clock->number != PIN_PCC_CLK) {
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mp_raise_ValueError_varg(translate("Invalid %q pin"), MP_QSTR_data_clock);
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}
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// technically, 0 was validated as free already but check again
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for (int i = 0; i < data_count; i++) {
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if (!pin_number_is_free(data_pins[i])) {
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mp_raise_ValueError_varg(translate("data pin #%d in use"), i);
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}
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}
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PCC->MR.bit.PCEN = 0; // Make sure PCC is disabled before setting MR reg
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PCC->IDR.reg = 0b1111; // Disable all PCC interrupts
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MCLK->APBDMASK.bit.PCC_ = 1; // Enable PCC clock
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// Accumulate 4 bytes into RHR register (two 16-bit pixels)
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PCC->MR.reg = PCC_MR_CID(0x1) | // Clear on falling DEN1 (VSYNC)
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PCC_MR_ISIZE(0x0) | // Input data bus is 8 bits
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PCC_MR_DSIZE(0x2); // "4 data" at a time (accumulate in RHR)
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PCC->MR.bit.PCEN = 1; // Enable PCC
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// Now we know we can allocate all pins
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self->data_count = data_count;
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self->vertical_sync = vertical_sync ? vertical_sync->number : NO_PIN;
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self->horizontal_reference = horizontal_reference ? horizontal_reference->number : NO_PIN;
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gpio_set_pin_direction(PIN_PCC_CLK, GPIO_DIRECTION_IN);
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gpio_set_pin_pull_mode(PIN_PCC_CLK, GPIO_PULL_OFF);
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gpio_set_pin_function(PIN_PCC_CLK, GPIO_PIN_FUNCTION_PCC);
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// claim_pin_number(PIN_PCC_CLK);
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if (vertical_sync) {
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gpio_set_pin_direction(PIN_PCC_DEN1, GPIO_DIRECTION_IN);
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gpio_set_pin_pull_mode(PIN_PCC_DEN1, GPIO_PULL_OFF);
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gpio_set_pin_function(PIN_PCC_DEN1, GPIO_PIN_FUNCTION_PCC); // VSYNC
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// claim_pin_number(PIN_PCC_DEN1);
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}
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if (horizontal_reference) {
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gpio_set_pin_direction(PIN_PCC_DEN2, GPIO_DIRECTION_IN);
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gpio_set_pin_pull_mode(PIN_PCC_DEN2, GPIO_PULL_OFF);
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gpio_set_pin_function(PIN_PCC_DEN2, GPIO_PIN_FUNCTION_PCC); // HSYNC
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// claim_pin_number(PIN_PCC_DEN2);
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}
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for (int i = 0; i < data_count; i++) {
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gpio_set_pin_direction(PIN_PCC_D0 + i, GPIO_DIRECTION_IN);
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gpio_set_pin_pull_mode(PIN_PCC_D0 + i, GPIO_PULL_OFF);
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gpio_set_pin_function(PIN_PCC_D0 + i, GPIO_PIN_FUNCTION_PCC);
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// claim_pin_number(PIN_PCC_D0+i);
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}
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}
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void common_hal_imagecapture_parallelimagecapture_deinit(imagecapture_parallelimagecapture_obj_t *self) {
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if (common_hal_imagecapture_parallelimagecapture_deinited(self)) {
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return;
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}
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reset_pin_number(self->vertical_sync);
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reset_pin_number(self->horizontal_reference);
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reset_pin_number(PIN_PCC_CLK);
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for (int i = 0; i < self->data_count; i++) {
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reset_pin_number(PIN_PCC_D0 + i);
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}
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self->data_count = 0;
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}
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bool common_hal_imagecapture_parallelimagecapture_deinited(imagecapture_parallelimagecapture_obj_t *self) {
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return self->data_count == 0;
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}
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static void setup_dma(DmacDescriptor *descriptor, size_t count, uint32_t *buffer) {
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descriptor->BTCTRL.reg = DMAC_BTCTRL_VALID |
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DMAC_BTCTRL_BLOCKACT_NOACT |
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DMAC_BTCTRL_EVOSEL_BLOCK |
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DMAC_BTCTRL_DSTINC |
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DMAC_BTCTRL_BEATSIZE_WORD;
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descriptor->BTCNT.reg = count;
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descriptor->DSTADDR.reg = (uint32_t)buffer + 4 * count;
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descriptor->SRCADDR.reg = (uint32_t)&PCC->RHR.reg;
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descriptor->DESCADDR.reg = 0;
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}
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#include <string.h>
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void common_hal_imagecapture_parallelimagecapture_capture(imagecapture_parallelimagecapture_obj_t *self, void *buffer, size_t bufsize) {
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uint8_t dma_channel = dma_allocate_channel();
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uint32_t *dest = buffer;
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size_t count = bufsize / 4; // PCC receives 4 bytes (2 pixels) at a time
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turn_on_event_system();
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setup_dma(dma_descriptor(dma_channel), count, dest);
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dma_configure(dma_channel, PCC_DMAC_ID_RX, true);
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if (self->vertical_sync) {
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const volatile uint32_t *vsync_reg = &PORT->Group[(self->vertical_sync / 32)].IN.reg;
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uint32_t vsync_bit = 1 << (self->vertical_sync % 32);
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while (*vsync_reg & vsync_bit) {
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// Wait for VSYNC low (frame end)
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RUN_BACKGROUND_TASKS;
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// Allow user to break out of a timeout with a KeyboardInterrupt.
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if (mp_hal_is_interrupted()) {
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dma_free_channel(dma_channel);
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return;
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}
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}
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}
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dma_enable_channel(dma_channel);
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while (DMAC->Channel[dma_channel].CHCTRLA.bit.ENABLE) {
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RUN_BACKGROUND_TASKS;
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if (mp_hal_is_interrupted()) {
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break;
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}
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}
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dma_disable_channel(dma_channel);
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dma_free_channel(dma_channel);
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}
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