A LoRa APRS node with KISS interface based on a Raspberry Pi Pico
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/*
* Copyright (c) 2020 Raspberry Pi (Trading) Ltd.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
#include <cstdio>
#include <iterator>
#include "pio_assembler.h"
#include "parser.hpp"
#ifdef _MSC_VER
#pragma warning(disable : 4996) // fopen
#endif
using syntax_error = yy::parser::syntax_error;
std::string output_format::default_name = "c-sdk";
pio_assembler::pio_assembler() {
}
int pio_assembler::generate(std::shared_ptr<output_format> _format, const std::string &_source,
const std::string &_dest, const std::vector<std::string> &_options) {
format = _format;
source = _source;
dest = _dest;
options = _options;
location.initialize(&source);
scan_begin();
yy::parser parse(*this);
// parse.set_debug_level(false);
int res = parse();
scan_end();
return res;
}
void program::add_instruction(std::shared_ptr<instruction> inst) {
uint limit = MAX_INSTRUCTIONS;
if (instructions.size() >= limit) {
// todo take offset into account
std::stringstream msg;
msg << "program instruction limit of " << limit << " instruction(s) exceeded";
throw syntax_error(inst->location, msg.str());
}
if (!sideset_opt && !inst->sideset) {
std::stringstream msg;
msg << "instruction requires 'side' to specify side set value for the instruction because non optional sideset was specified for the program at " << sideset.location;
throw syntax_error(inst->location, msg.str());
}
instructions.push_back(inst);
}
using syntax_error = yy::parser::syntax_error;
void program::add_symbol(std::shared_ptr<symbol> symbol) {
const auto &existing = pioasm->get_symbol(symbol->name, this);
if (existing) {
std::stringstream msg;
if (symbol->is_label != existing->is_label) {
msg << "'" << symbol->name << "' was already defined as a " << (existing->is_label ? "label" : "value")
<< " at " << existing->location;
} else if (symbol->is_label) {
msg << "label '" << symbol->name << "' was already defined at " << existing->location;
} else {
msg << "'" << symbol->name << "' was already defined at " << existing->location;
}
throw syntax_error(symbol->location, msg.str());
}
symbols.insert(std::pair<std::string, std::shared_ptr<::symbol>>(symbol->name, symbol));
ordered_symbols.push_back(symbol);
}
int resolvable::resolve(const program &program) {
return resolve(program.pioasm, &program);
}
int unary_operation::resolve(pio_assembler *pioasm, const program *program, const resolvable &scope) {
int value = arg->resolve(pioasm, program, scope);
switch (op) {
case negate:
return -value;
case reverse: {
// slow is fine
uint result = 0;
for (uint i = 0; i < 32; i++) {
result <<= 1u;
if (value & 1u) {
result |= 1u;
}
value >>= 1u;
}
return result;
}
default:
throw syntax_error(location, "internal error");
}
}
int binary_operation::resolve(pio_assembler *pioasm, const program *program, const resolvable &scope) {
int lvalue = left->resolve(pioasm, program, scope);
int rvalue = right->resolve(pioasm, program, scope);
switch (op) {
case add:
return lvalue + rvalue;
case subtract:
return lvalue - rvalue;
case multiply:
return lvalue * rvalue;
case divide:
return lvalue / rvalue;
case and_:
return lvalue & rvalue;
case or_:
return lvalue | rvalue;
case xor_:
return lvalue ^ rvalue;
default:
throw syntax_error(location, "internal error");
}
}
void program::set_wrap(const yy::location &l) {
if (wrap) {
std::stringstream msg;
msg << ".wrap was already specified at " << wrap->location;
throw syntax_error(l, msg.str());
}
if (instructions.empty()) {
throw syntax_error(l, ".wrap cannot be placed before the first program instruction");
}
wrap = resolvable_int(l, instructions.size() - 1);
}
void program::set_wrap_target(const yy::location &l) {
if (wrap_target) {
std::stringstream msg;
msg << ".wrap_target was already specified at " << wrap_target->location;
throw syntax_error(l, msg.str());
}
wrap_target = resolvable_int(l, instructions.size());
}
void program::add_code_block(const code_block &block) {
code_blocks[block.lang].push_back(block);
}
void program::add_lang_opt(std::string lang, std::string name, std::string value) {
lang_opts[lang].emplace_back(name, value);
}
void program::finalize() {
if (sideset.value) {
int bits = sideset.value->resolve(*this);
if (bits < 0) {
throw syntax_error(sideset.value->location, "number of side set bits must be positive");
}
sideset_max = (1u << bits) - 1;
if (sideset_opt) bits++;
sideset_bits_including_opt = bits;
if (bits > 5) {
if (sideset_opt)
throw syntax_error(sideset.value->location, "maximum number of side set bits with optional is 4");
else
throw syntax_error(sideset.value->location, "maximum number of side set bits is 5");
}
delay_max = (1u << (5 - bits)) - 1;
} else {
sideset_max = 0;
delay_max = 31;
}
}
int name_ref::resolve(pio_assembler *pioasm, const program *program, const resolvable &scope) {
auto symbol = pioasm->get_symbol(name, program);
if (symbol) {
if (symbol->resolve_started) {
std::stringstream msg;
msg << "circular dependency in definition of '" << name << "'; detected at " << location << ")";
throw syntax_error(scope.location, msg.str());
}
try {
symbol->resolve_started++;
int rc = symbol->value->resolve(pioasm, program, scope);
symbol->resolve_started--;
return rc;
} catch (syntax_error &e) {
symbol->resolve_started--;
throw e;
}
} else {
std::stringstream msg;
msg << "undefined symbol '" << name << "'";
throw syntax_error(location, msg.str());
}
}
uint instruction::encode(const program &program) {
raw_encoding raw = raw_encode(program);
int _delay = delay->resolve(program);
if (_delay < 0) {
throw syntax_error(delay->location, "instruction delay must be positive");
}
if (_delay > program.delay_max) {
if (program.delay_max == 31) {
throw syntax_error(delay->location, "instruction delay must be <= 31");
} else {
std::stringstream msg;
msg << "the instruction delay limit is " << program.delay_max << " because of the side set specified at "
<< program.sideset.location;
throw syntax_error(delay->location, msg.str());
}
}
int _sideset = 0;
if (sideset) {
_sideset = sideset->resolve(program);
if (_sideset < 0) {
throw syntax_error(sideset->location, "side set value must be >=0");
}
if (_sideset > program.sideset_max) {
std::stringstream msg;
msg << "the maximum side set value is " << program.sideset_max << " based on the configuration specified at "
<< program.sideset.location;
throw syntax_error(sideset->location, msg.str());
}
_sideset <<= (5u - program.sideset_bits_including_opt);
if (program.sideset_opt) {
_sideset |= 0x10u;
}
}
return (((uint) raw.type) << 13u) | (((uint) _delay | (uint) _sideset) << 8u) | (raw.arg1 << 5u) | raw.arg2;
}
raw_encoding instruction::raw_encode(const program &program) {
throw syntax_error(location, "internal error");
}
uint instr_word::encode(const program &program) {
uint value = encoding->resolve(program);
if (value > 0xffffu) {
throw syntax_error(location, ".word value must be a positive 16 bit value");
}
return value;
}
raw_encoding instr_jmp::raw_encode(const program &program) {
int dest = target->resolve(program);
if (dest < 0) {
throw syntax_error(target->location, "jmp target address must be positive");
} else if (dest >= (int)program.instructions.size()) {
std::stringstream msg;
msg << "jmp target address " << dest << " is beyond the end of the program";
throw syntax_error(target->location, msg.str());
}
return {inst_type::jmp, (uint) cond, (uint) dest};
}
raw_encoding instr_in::raw_encode(const program &program) {
int v = value->resolve(program);
if (v < 1 || v > 32) {
throw syntax_error(value->location, "'in' bit count must be >= 1 and <= 32");
}
return {inst_type::in, (uint) src, (uint) v & 0x1fu};
}
raw_encoding instr_out::raw_encode(const program &program) {
int v = value->resolve(program);
if (v < 1 || v > 32) {
throw syntax_error(value->location, "'out' bit count must be >= 1 and <= 32");
}
return {inst_type::out, (uint) dest, (uint) v & 0x1fu};
}
raw_encoding instr_set::raw_encode(const program &program) {
int v = value->resolve(program);
if (v < 0 || v > 31) {
throw syntax_error(value->location, "'set' bit count must be >= 0 and <= 31");
}
return {inst_type::set, (uint) dest, (uint) v};
}
raw_encoding instr_wait::raw_encode(const program &program) {
uint pol = polarity->resolve(program);
if (pol > 1) {
throw syntax_error(polarity->location, "'wait' polarity must be 0 or 1");
}
uint arg2 = source->param->resolve(program);
switch (source->target) {
case wait_source::irq:
if (arg2 > 7) throw syntax_error(source->param->location, "irq number must be must be >= 0 and <= 7");
break;
case wait_source::gpio:
if (arg2 > 31)
throw syntax_error(source->param->location, "absolute GPIO number must be must be >= 0 and <= 31");
break;
case wait_source::pin:
if (arg2 > 31) throw syntax_error(polarity->location, "pin number must be must be >= 0 and <= 31");
break;
}
return {inst_type::wait, (pol << 2u) | (uint) source->target, arg2 | (source->flag ? 0x10u : 0u)};
}
raw_encoding instr_irq::raw_encode(const program &program) {
uint arg2 = num->resolve(program);
if (arg2 > 7) throw syntax_error(num->location, "irq number must be must be >= 0 and <= 7");
if (relative) arg2 |= 0x10u;
return {inst_type::irq, (uint)modifiers, arg2};
}
std::vector<compiled_source::symbol> pio_assembler::public_symbols(program &program) {
std::vector<std::shared_ptr<symbol>> public_symbols;
std::remove_copy_if(program.ordered_symbols.begin(), program.ordered_symbols.end(),
std::inserter(public_symbols, public_symbols.end()),
[](const std::shared_ptr<symbol> &s) { return !s->is_public; });
std::vector<compiled_source::symbol> rc;
std::transform(public_symbols.begin(), public_symbols.end(), std::back_inserter(rc),
[&](const std::shared_ptr<symbol> &s) {
return compiled_source::symbol(s->name, s->value->resolve(program), s->is_label);
});
return rc;
}
int pio_assembler::write_output() {
std::set<std::string> known_output_formats;
std::transform(output_format::all().begin(), output_format::all().end(),
std::inserter(known_output_formats, known_output_formats.begin()),
[&](std::shared_ptr<output_format> &f) {
return f->name;
});
compiled_source source;
source.global_symbols = public_symbols(get_dummy_global_program());
for (auto &program : programs) {
program.finalize();
source.programs.emplace_back(compiled_source::program(program.name));
auto &cprogram = source.programs[source.programs.size() - 1];
cprogram = compiled_source::program(program.name);
// encode the instructions
std::transform(program.instructions.begin(), program.instructions.end(),
std::back_inserter(cprogram.instructions), [&](std::shared_ptr<instruction> &inst) {
return inst->encode(program);
});
for (const auto &e : program.code_blocks) {
bool ok = false;
for(const auto &o : known_output_formats) {
if (o == e.first || 0 == e.first.find(o+"-")) {
ok = true;
break;
}
}
if (!ok) {
std::cerr << e.second[0].location << ": warning, unknown code block output type '" << e.first << "'\n";
known_output_formats.insert(e.first);
}
}
if (program.wrap) cprogram.wrap = program.wrap->resolve(program); else cprogram.wrap = std::max((int)program.instructions.size() - 1, 0);
if (program.wrap_target) cprogram.wrap_target = program.wrap_target->resolve(program); else cprogram.wrap_target = 0;
if (program.origin.value) cprogram.origin = program.origin.value->resolve(program);
if (program.sideset.value) {
cprogram.sideset_bits_including_opt = program.sideset_bits_including_opt;
cprogram.sideset_opt = program.sideset_opt;
cprogram.sideset_pindirs = program.sideset_pindirs;
}
std::transform(program.code_blocks.begin(), program.code_blocks.end(), std::inserter(cprogram.code_blocks, cprogram.code_blocks.begin()), [](const std::pair<std::string, std::vector<code_block>>&e) {
std::vector<std::string> blocks;
std::transform(e.second.begin(), e.second.end(), std::back_inserter(blocks), [&](const code_block& block) {
return block.contents;
});
return std::pair<std::string, std::vector<std::string>>(e.first, blocks);
});
cprogram.lang_opts = program.lang_opts;
cprogram.symbols = public_symbols(program);
}
if (programs.empty()) {
std::cout << "warning: input contained no programs" << std::endl;
}
return format->output(dest, options, source);
}
FILE *output_format::open_single_output(std::string destination) {
FILE *out = destination == "-" ? stdout : fopen(destination.c_str(), "w");
if (!out) {
std::cerr << "Can't open output file '" << destination << "'" << std::endl;
}
return out;
}