A lean alternative for the C++ IOStream library, sized for embedded systems
The standard IOStream library works great on a Pico, but inflates the code size. In a 2022 CppCon talk "Modern C++ to Impress Your Embedded Dev Friends", Steve Bush presented a lightweight alternative: a FileStream that's perfectly sized for embedded use.
I ported it for Pico. It supports streaming to the Pico stdio supported COM ports: the Pico's USB, a PicoProbe's USB, or the Pico's UART0.
Usage example:
#include <stdio.h>
#include "pico/stdio.h"
#include "filestream.hpp"
namespace mcu
{
FileStream debug(1);
}
int main(int, char** )
{
stdio_init_all();
mcu::debug << "Hello, world!\r\n";
mcu::debug << mcu::FileStream::RadixEnum::Hexadecimal << 6 << "\r\n";
while (true) continue;
}
To use it in your C++ project, you just add a few lines to your CMake file:
# add_subdirectory()pico_add_subdirectory(lean_stream_io)# ...target_link_libraries(${CMAKE_PROJECT_NAME} pico_stdlib lean_stream_io )# adjust to enable stdio via usb, or uartpico_enable_stdio_usb(${CMAKE_PROJECT_NAME} 0)pico_enable_stdio_uart(${CMAKE_PROJECT_NAME} 1)Github repository, with example program: https://github.com/jancumps/pico-lean-stream-io
Steve Bush CppCon 2022 talk: Modern C++ to Impress Your Embedded Dev Friends
The code is Steve's original code written for the conference. I provided an implementation of the _write() function that uses the Pico.C SDK stdio functionality.
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Steve Bush referenced material:
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