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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 "x300_impl.hpp"
#include "x300_regs.hpp"
#include <uhd/exception.hpp>
#include <uhd/types/serial.hpp>
#include <uhd/types/wb_iface.hpp>
#include <uhd/utils/log.hpp>
#include <chrono>
#include <mutex>
using namespace uhd;
struct x300_uart_iface : uart_iface
{
x300_uart_iface(wb_iface::sptr iface)
: _iface(iface), rxoffset(0), txword32(0), _last_device_rxoffset(0)
{
txoffset =
_iface->peek32(SR_ADDR(X300_FW_SHMEM_BASE, X300_FW_SHMEM_UART_TX_INDEX));
rxpool = _iface->peek32(SR_ADDR(X300_FW_SHMEM_BASE, X300_FW_SHMEM_UART_RX_ADDR));
txpool = _iface->peek32(SR_ADDR(X300_FW_SHMEM_BASE, X300_FW_SHMEM_UART_TX_ADDR));
poolsize =
_iface->peek32(SR_ADDR(X300_FW_SHMEM_BASE, X300_FW_SHMEM_UART_WORDS32));
_rxcache.resize(poolsize);
// this->write_uart("HELLO UART\n");
// this->read_uart(0.1);
}
void putchar(const char ch)
{
const int shift = ((txoffset % 4) * 8);
if (shift == 0)
txword32 = 0;
txword32 |= uint32_t(ch) << shift;
// Write out full 32 bit words or whatever we have if end of string
if (txoffset % 4 == 3 or ch == '\n') {
_iface->poke32(SR_ADDR(txpool, txoffset / 4), txword32);
}
txoffset = (txoffset + 1) % (poolsize * 4);
if (ch == '\n') {
// Tell the X300 to write the string
_iface->poke32(
SR_ADDR(X300_FW_SHMEM_BASE, X300_FW_SHMEM_UART_TX_INDEX), txoffset);
}
}
void write_uart(const std::string& buff) override
{
std::lock_guard<std::mutex> lock(_write_mutex);
for (const char ch : buff) {
this->putchar(ch);
}
}
int getchar(void)
{
if (rxoffset == _last_device_rxoffset)
return -1;
int ret = static_cast<int>(
_rxcache[((rxoffset) / 4) % poolsize] >> ((rxoffset % 4) * 8) & 0xFF);
rxoffset++;
return ret;
}
void update_cache(void)
{
uint32_t device_rxoffset =
_iface->peek32(SR_ADDR(X300_FW_SHMEM_BASE, X300_FW_SHMEM_UART_RX_INDEX));
uint32_t delta = device_rxoffset - rxoffset;
while (delta) {
if (delta >= poolsize * 4) {
// all the data is new - reload the entire cache
for (uint32_t i = 0; i < poolsize; i++) {
_rxcache[i] = _iface->peek32(SR_ADDR(rxpool, i));
}
// set the head to the same character as the current device
// offset (tail) one loop earlier
rxoffset = device_rxoffset - (poolsize * 4);
// set the tail to the current device offset
_last_device_rxoffset = device_rxoffset;
// the string at the head is a partial, so skip it
for (int c = getchar(); c != '\n' and c != -1; c = getchar()) {
}
// clear the partial string in the buffer, if any
_rxbuff.clear();
} else if (rxoffset == _last_device_rxoffset) {
// new data was added - refresh the portion of the cache that was updated
for (uint32_t i = (_last_device_rxoffset / 4) % poolsize;
i != ((device_rxoffset / 4) + 1) % poolsize;
i = (i + 1) % poolsize) {
_rxcache[i] = _iface->peek32(SR_ADDR(rxpool, i));
}
// set the tail to the current device offset
_last_device_rxoffset = device_rxoffset;
} else {
// there is new data, but we aren't done with what we have - check back
// later
break;
}
// check again to see if anything changed while we were updating the cache
device_rxoffset =
_iface->peek32(SR_ADDR(X300_FW_SHMEM_BASE, X300_FW_SHMEM_UART_RX_INDEX));
delta = device_rxoffset - rxoffset;
}
}
std::string read_uart(double timeout) override
{
std::lock_guard<std::mutex> lock(_read_mutex);
const auto exit_time = std::chrono::steady_clock::now()
+ std::chrono::microseconds(int64_t(timeout * 1e6));
std::string buff;
while (true) {
// Update cache
this->update_cache();
// Get available characters
for (int ch = this->getchar(); ch != -1; ch = this->getchar()) {
// store character to buffer
_rxbuff.append(1, ch);
// newline found - return string
if (ch == '\n') {
buff.swap(_rxbuff);
return buff;
}
}
// no more characters - check time
if (std::chrono::steady_clock::now() > exit_time) {
break;
}
}
return buff;
}
wb_iface::sptr _iface;
uint32_t rxoffset, txoffset, txword32, rxpool, txpool, poolsize;
uint32_t _last_device_rxoffset;
std::vector<uint32_t> _rxcache;
std::string _rxbuff;
std::mutex _read_mutex;
std::mutex _write_mutex;
};
uart_iface::sptr x300_make_uart_iface(wb_iface::sptr iface)
{
return uart_iface::sptr(new x300_uart_iface(iface));
}
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