portapack-mayhem/firmware/baseband/touch_dma.cpp
Jared Boone c75c167c25 Rename GPDMA channel disable_force() to disable().
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).
2016-01-10 10:11:16 -08:00

130 lines
3.3 KiB
C++

/*
* Copyright (C) 2014 Jared Boone, ShareBrained Technology, Inc.
*
* This file is part of PortaPack.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
#include "touch_dma.hpp"
#include <cstdint>
#include <cstddef>
#include <array>
#include "hal.h"
#include "gpdma.hpp"
using namespace lpc43xx;
#include "portapack_dma.hpp"
#include "portapack_adc.hpp"
#include "portapack_shared_memory.hpp"
namespace touch {
namespace dma {
/* TODO: SO MUCH REPEATED CODE FROM rssi_dma.cpp!!! */
static constexpr auto& gpdma_channel = gpdma::channels[portapack::adc0_gpdma_channel_number];
constexpr uint32_t gpdma_ahb_master_peripheral = 1;
constexpr uint32_t gpdma_ahb_master_memory = 0;
constexpr uint32_t gpdma_ahb_master_lli_fetch = 0;
constexpr uint32_t gpdma_src_peripheral = 0xd;
constexpr uint32_t gpdma_dest_peripheral = 0xd;
constexpr gpdma::channel::LLIPointer lli_pointer(const void* lli) {
return {
.lm = gpdma_ahb_master_lli_fetch,
.r = 0,
.lli = reinterpret_cast<uint32_t>(lli),
};
}
constexpr gpdma::channel::Control control(const size_t number_of_transfers) {
return {
.transfersize = number_of_transfers,
.sbsize = 2, /* Burst size: 8 transfers */
.dbsize = 2, /* Burst size: 8 transfers */
.swidth = 2, /* Source transfer width: word (32 bits) */
.dwidth = 2, /* Destination transfer width: word (32 bits) */
.s = gpdma_ahb_master_peripheral,
.d = gpdma_ahb_master_memory,
.si = 1,
.di = 1,
.prot1 = 0,
.prot2 = 0,
.prot3 = 0,
.i = 0,
};
}
constexpr gpdma::channel::Config config() {
return {
.e = 0,
.srcperipheral = gpdma_src_peripheral,
.destperipheral = gpdma_dest_peripheral,
.flowcntrl = gpdma::FlowControl::PeripheralToMemory_DMAControl,
.ie = 0,
.itc = 0,
.l = 0,
.a = 0,
.h = 0,
};
}
static gpdma::channel::LLI lli;
constexpr size_t channels_per_sample = 8;
//constexpr size_t samples_per_frame = 40;
//constexpr size_t channel_samples_per_frame = channels_per_sample * samples_per_frame;
void init() {
}
void allocate() {
//samples = new sample_t[channel_samples_per_frame];
//lli = new gpdma::channel::LLI;
lli.srcaddr = reinterpret_cast<uint32_t>(&LPC_ADC0->DR[0]);
lli.destaddr = reinterpret_cast<uint32_t>(&shared_memory.touch_adc_frame.dr[0]);
lli.lli = lli_pointer(&lli);
lli.control = control(channels_per_sample);
}
void free() {
//delete samples;
//delete lli;
}
void enable() {
const auto gpdma_config = config();
gpdma_channel.configure(lli, gpdma_config);
gpdma_channel.enable();
}
bool is_enabled() {
return gpdma_channel.is_enabled();
}
void disable() {
gpdma_channel.disable();
}
} /* namespace dma */
} /* namespace touch */