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https://github.com/eried/portapack-mayhem.git
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c75c167c25
There was nothing particularly forceful about the disable_force() code. Whether it's a "forced" operation depends on what happens before and after (HALT and ACTIVE flags are involved in a smooth disabling of the channel).
130 lines
3.3 KiB
C++
130 lines
3.3 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 "touch_dma.hpp"
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#include <cstdint>
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#include <cstddef>
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#include <array>
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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 "portapack_shared_memory.hpp"
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namespace touch {
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namespace dma {
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/* TODO: SO MUCH REPEATED CODE FROM rssi_dma.cpp!!! */
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static constexpr auto& gpdma_channel = gpdma::channels[portapack::adc0_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_src_peripheral = 0xd;
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constexpr uint32_t gpdma_dest_peripheral = 0xd;
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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 = 2, /* Burst size: 8 transfers */
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.dbsize = 2, /* Burst size: 8 transfers */
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.swidth = 2, /* Source transfer width: word (32 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 = 1,
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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 = 0,
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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 = 0,
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.itc = 0,
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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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static gpdma::channel::LLI lli;
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constexpr size_t channels_per_sample = 8;
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//constexpr size_t samples_per_frame = 40;
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//constexpr size_t channel_samples_per_frame = channels_per_sample * samples_per_frame;
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void init() {
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}
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void allocate() {
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//samples = new sample_t[channel_samples_per_frame];
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//lli = new gpdma::channel::LLI;
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lli.srcaddr = reinterpret_cast<uint32_t>(&LPC_ADC0->DR[0]);
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lli.destaddr = reinterpret_cast<uint32_t>(&shared_memory.touch_adc_frame.dr[0]);
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lli.lli = lli_pointer(&lli);
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lli.control = control(channels_per_sample);
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}
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void free() {
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//delete samples;
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//delete lli;
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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, 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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} /* namespace dma */
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} /* namespace touch */
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