mayhem-firmware/firmware/baseband-tx/rssi_dma.cpp

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/*
* 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 "rssi_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 "thread_wait.hpp"
namespace rf {
namespace rssi {
namespace dma {
/* TODO: SO MUCH REPEATED CODE IN touch_dma.cpp!!! */
static constexpr auto& gpdma_channel = gpdma::channels[portapack::adc1_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_peripheral = 0xe;
constexpr uint32_t gpdma_src_peripheral = gpdma_peripheral;
constexpr uint32_t gpdma_dest_peripheral = gpdma_peripheral;
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 = 0, /* Burst size: 1 transfer */
.dbsize = 0, /* Burst size: 1 transfer */
.swidth = 0, /* Source transfer width: byte (8 bits) */
.dwidth = 2, /* Destination transfer width: word (32 bits) */
.s = gpdma_ahb_master_peripheral,
.d = gpdma_ahb_master_memory,
.si = 0,
.di = 1,
.prot1 = 0,
.prot2 = 0,
.prot3 = 0,
.i = 1,
};
}
constexpr gpdma::channel::Config config() {
return {
.e = 0,
.srcperipheral = gpdma_src_peripheral,
.destperipheral = gpdma_dest_peripheral,
.flowcntrl = gpdma::FlowControl::PeripheralToMemory_DMAControl,
.ie = 1,
.itc = 1,
.l = 0,
.a = 0,
.h = 0,
};
}
struct buffers_config_t {
size_t count;
size_t items_per_buffer;
};
static buffers_config_t buffers_config;
static sample_t *samples { nullptr };
static gpdma::channel::LLI *lli { nullptr };
static ThreadWait thread_wait;
static void transfer_complete() {
const auto next_lli_index = gpdma_channel.next_lli() - &lli[0];
thread_wait.wake_from_interrupt(next_lli_index);
}
static void dma_error() {
thread_wait.wake_from_interrupt(-1);
disable();
}
void init() {
gpdma_channel.set_handlers(transfer_complete, dma_error);
// LPC_GPDMA->SYNC |= (1 << gpdma_peripheral);
}
void allocate(size_t buffer_count, size_t items_per_buffer) {
buffers_config = {
.count = buffer_count,
.items_per_buffer = items_per_buffer,
};
const auto peripheral = reinterpret_cast<uint32_t>(&LPC_ADC1->DR[portapack::adc1_rssi_input]) + 1;
const auto control_value = control(gpdma::buffer_words(buffers_config.items_per_buffer, 1));
samples = new sample_t[buffers_config.count * buffers_config.items_per_buffer];
lli = new gpdma::channel::LLI[buffers_config.count];
for(size_t i=0; i<buffers_config.count; i++) {
const auto memory = reinterpret_cast<uint32_t>(&samples[i * buffers_config.items_per_buffer]);
lli[i].srcaddr = peripheral;
lli[i].destaddr = memory;
lli[i].lli = lli_pointer(&lli[(i + 1) % buffers_config.count]);
lli[i].control = control_value;
}
}
void free() {
delete samples;
delete lli;
}
void enable() {
const auto gpdma_config = config();
gpdma_channel.configure(lli[0], gpdma_config);
gpdma_channel.enable();
}
bool is_enabled() {
return gpdma_channel.is_enabled();
}
void disable() {
gpdma_channel.disable();
}
rf::rssi::buffer_t wait_for_buffer() {
const auto next_index = thread_wait.sleep();
if( next_index >= 0 ) {
const size_t free_index = (next_index + buffers_config.count - 2) % buffers_config.count;
return { reinterpret_cast<sample_t*>(lli[free_index].destaddr), buffers_config.items_per_buffer };
} else {
// TODO: Should I return here, or loop if RDY_RESET?
return { nullptr, 0 };
}
}
} /* namespace dma */
} /* namespace rssi */
} /* namespace rf */