Initial firmware commit.

firmware/baseband/touch_dma.cpp

@@ -0,0 +1,129 @@
+/*
+ * 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_force();
+}
+
+} /* namespace dma */
+} /* namespace touch */