mirror of
https://github.com/portapack-mayhem/mayhem-firmware.git
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a476647d70
* Use unique_ptr in ui_btngrid * Use unique_ptr for ui_menu * Use unique_ptr for rssi_dma * Use unique_ptr for painter
178 lines
4.9 KiB
C++
178 lines
4.9 KiB
C++
/*
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* Copyright (C) 2014 Jared Boone, ShareBrained Technology, Inc.
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*
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* This file is part of PortaPack.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; see the file COPYING. If not, write to
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* the Free Software Foundation, Inc., 51 Franklin Street,
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* Boston, MA 02110-1301, USA.
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*/
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#include "rssi_dma.hpp"
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#include <array>
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#include <cstdint>
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#include <cstddef>
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#include <memory>
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#include "hal.h"
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#include "gpdma.hpp"
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using namespace lpc43xx;
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#include "portapack_dma.hpp"
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#include "portapack_adc.hpp"
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#include "thread_wait.hpp"
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namespace rf {
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namespace rssi {
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namespace dma {
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/* TODO: SO MUCH REPEATED CODE IN touch_dma.cpp!!! */
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static constexpr auto& gpdma_channel = gpdma::channels[portapack::adc1_gpdma_channel_number];
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constexpr uint32_t gpdma_ahb_master_peripheral = 1;
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constexpr uint32_t gpdma_ahb_master_memory = 0;
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constexpr uint32_t gpdma_ahb_master_lli_fetch = 0;
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constexpr uint32_t gpdma_peripheral = 0xe;
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constexpr uint32_t gpdma_src_peripheral = gpdma_peripheral;
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constexpr uint32_t gpdma_dest_peripheral = gpdma_peripheral;
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constexpr gpdma::channel::LLIPointer lli_pointer(const void* lli) {
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return {
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.lm = gpdma_ahb_master_lli_fetch,
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.r = 0,
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.lli = reinterpret_cast<uint32_t>(lli),
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};
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}
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constexpr gpdma::channel::Control control(const size_t number_of_transfers) {
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return {
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.transfersize = number_of_transfers,
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.sbsize = 0, /* Burst size: 1 transfer */
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.dbsize = 0, /* Burst size: 1 transfer */
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.swidth = 0, /* Source transfer width: byte (8 bits) */
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.dwidth = 2, /* Destination transfer width: word (32 bits) */
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.s = gpdma_ahb_master_peripheral,
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.d = gpdma_ahb_master_memory,
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.si = 0,
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.di = 1,
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.prot1 = 0,
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.prot2 = 0,
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.prot3 = 0,
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.i = 1,
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};
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}
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constexpr gpdma::channel::Config config() {
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return {
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.e = 0,
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.srcperipheral = gpdma_src_peripheral,
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.destperipheral = gpdma_dest_peripheral,
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.flowcntrl = gpdma::FlowControl::PeripheralToMemory_DMAControl,
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.ie = 1,
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.itc = 1,
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.l = 0,
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.a = 0,
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.h = 0,
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};
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}
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struct buffers_config_t {
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size_t count;
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size_t items_per_buffer;
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};
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static buffers_config_t buffers_config;
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static std::unique_ptr<sample_t[]> samples;
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static std::unique_ptr<gpdma::channel::LLI[]> lli;
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static ThreadWait thread_wait;
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static void transfer_complete() {
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const auto next_lli_index = gpdma_channel.next_lli() - &lli[0];
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thread_wait.wake_from_interrupt(next_lli_index);
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}
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static void dma_error() {
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thread_wait.wake_from_interrupt(-1);
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disable();
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}
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void init() {
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gpdma_channel.set_handlers(transfer_complete, dma_error);
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// LPC_GPDMA->SYNC |= (1 << gpdma_peripheral);
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}
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void allocate(size_t buffer_count, size_t items_per_buffer) {
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buffers_config = {
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.count = buffer_count,
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.items_per_buffer = items_per_buffer,
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};
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const auto peripheral = reinterpret_cast<uint32_t>(&LPC_ADC1->DR[portapack::adc1_rssi_input]) + 1;
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const auto control_value = control(gpdma::buffer_words(buffers_config.items_per_buffer, 1));
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samples = std::make_unique<sample_t[]>(buffers_config.count * buffers_config.items_per_buffer);
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lli = std::make_unique<gpdma::channel::LLI[]>(buffers_config.count);
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for (size_t i = 0; i < buffers_config.count; i++) {
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const auto memory = reinterpret_cast<uint32_t>(&samples[i * buffers_config.items_per_buffer]);
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lli[i].srcaddr = peripheral;
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lli[i].destaddr = memory;
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lli[i].lli = lli_pointer(&lli[(i + 1) % buffers_config.count]);
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lli[i].control = control_value;
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}
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}
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void free() {
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samples.reset();
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lli.reset();
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}
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void enable() {
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const auto gpdma_config = config();
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gpdma_channel.configure(lli[0], gpdma_config);
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gpdma_channel.enable();
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}
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bool is_enabled() {
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return gpdma_channel.is_enabled();
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}
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void disable() {
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gpdma_channel.disable();
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}
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rf::rssi::buffer_t wait_for_buffer() {
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const auto next_index = thread_wait.sleep();
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if (next_index >= 0) {
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const size_t free_index = (next_index + buffers_config.count - 2) % buffers_config.count;
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return {reinterpret_cast<sample_t*>(lli[free_index].destaddr), buffers_config.items_per_buffer};
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} else {
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// TODO: Should I return here, or loop if RDY_RESET?
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return {nullptr, 0};
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}
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}
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} /* namespace dma */
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} /* namespace rssi */
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} /* namespace rf */
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