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//
// Copyright 2013 Ettus Research LLC
// Copyright 2018 Ettus Research, a National Instruments Company
//
// SPDX-License-Identifier: GPL-3.0-or-later
//
#include "b200_uart.hpp"
#include "b200_impl.hpp"
#include <uhd/transport/bounded_buffer.hpp>
#include <uhd/transport/vrt_if_packet.hpp>
#include <uhd/utils/byteswap.hpp>
#include <uhd/utils/log.hpp>
#include <uhd/types/time_spec.hpp>
#include <uhd/exception.hpp>
using namespace uhd;
using namespace uhd::transport;
struct b200_uart_impl : b200_uart
{
b200_uart_impl(zero_copy_if::sptr xport, const uint32_t sid):
_xport(xport),
_sid(sid),
_count(0),
_baud_div(std::floor(B200_BUS_CLOCK_RATE/115200 + 0.5)),
_line_queue(4096)
{
/*NOP*/
}
void send_char(const char ch)
{
managed_send_buffer::sptr buff = _xport->get_send_buff();
UHD_ASSERT_THROW(bool(buff));
vrt::if_packet_info_t packet_info;
packet_info.link_type = vrt::if_packet_info_t::LINK_TYPE_CHDR;
packet_info.packet_type = vrt::if_packet_info_t::PACKET_TYPE_CONTEXT;
packet_info.num_payload_words32 = 2;
packet_info.num_payload_bytes = packet_info.num_payload_words32*sizeof(uint32_t);
packet_info.packet_count = _count++;
packet_info.sob = false;
packet_info.eob = false;
packet_info.sid = _sid;
packet_info.has_sid = true;
packet_info.has_cid = false;
packet_info.has_tsi = false;
packet_info.has_tsf = false;
packet_info.has_tlr = false;
uint32_t *packet_buff = buff->cast<uint32_t *>();
vrt::if_hdr_pack_le(packet_buff, packet_info);
packet_buff[packet_info.num_header_words32+0] = uhd::htowx(uint32_t(_baud_div));
packet_buff[packet_info.num_header_words32+1] = uhd::htowx(uint32_t(ch));
buff->commit(packet_info.num_packet_words32*sizeof(uint32_t));
}
void write_uart(const std::string &buff)
{
for(const char ch: buff)
{
this->send_char(ch);
}
}
std::string read_uart(double timeout)
{
std::string line;
_line_queue.pop_with_timed_wait(line, timeout);
return line;
}
void handle_uart_packet(managed_recv_buffer::sptr buff)
{
const uint32_t *packet_buff = buff->cast<const uint32_t *>();
vrt::if_packet_info_t packet_info;
packet_info.link_type = vrt::if_packet_info_t::LINK_TYPE_CHDR;
packet_info.num_packet_words32 = buff->size()/sizeof(uint32_t);
vrt::if_hdr_unpack_le(packet_buff, packet_info);
const char ch = char(uhd::wtohx(packet_buff[packet_info.num_header_words32+1]));
_line += ch;
if (ch == '\n')
{
_line_queue.push_with_pop_on_full(_line);
_line.clear();
}
}
const zero_copy_if::sptr _xport;
const uint32_t _sid;
size_t _count;
size_t _baud_div;
bounded_buffer<std::string> _line_queue;
std::string _line;
};
b200_uart::sptr b200_uart::make(zero_copy_if::sptr xport, const uint32_t sid)
{
return b200_uart::sptr(new b200_uart_impl(xport, sid));
}
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