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/*
* FileWriteBuffer.h
*
* Created on: 19 May 2017
* Author: Christian
*/
#ifndef SRC_STORAGE_FILEWRITEBUFFER_H_
#define SRC_STORAGE_FILEWRITEBUFFER_H_
#include "RepRapFirmware.h"
#if SAM4E || SAM4S || SAME70 || SAME5x
constexpr size_t NumFileWriteBuffers = 2; // Number of write buffers
constexpr size_t FileWriteBufLen = 8192; // Size of each write buffer
constexpr size_t SbcFileWriteBufLen = 4192; // Available size of each write buffer in SBC mode
#elif defined(__LPC17xx__)
# if HAS_WIFI_NETWORKING
constexpr size_t NumFileWriteBuffers = 1;
constexpr size_t FileWriteBufLen = 1024;
constexpr size_t SbcFileWriteBufLen = 768;
# else
constexpr size_t NumFileWriteBuffers = 1;
constexpr size_t FileWriteBufLen = 512;
constexpr size_t SbcFileWriteBufLen = 468;
# endif
#else
constexpr size_t NumFileWriteBuffers = 1;
constexpr size_t FileWriteBufLen = 4096;
constexpr size_t SbcFileWriteBufLen = 3072;
#endif
static_assert(FileWriteBufLen >= SbcFileWriteBufLen, "File write buffer must be at least as big as the configured SBC threshold");
// Class to cache data that is about to be written to the SD card. This is NOT a ring buffer,
// instead it just provides simple interfaces to cache a certain amount of data so that fewer
// f_write() calls are needed. This effectively improves upload speeds.
class FileWriteBuffer
{
public:
#if SAME70
FileWriteBuffer(FileWriteBuffer *n, char *storage) noexcept : next(n), index(0), buf(storage) { }
#else
explicit FileWriteBuffer(FileWriteBuffer *n) noexcept : next(n), index(0) { }
#endif
static void UsingSbcMode() { fileWriteBufLen = SbcFileWriteBufLen; } // only called by RepRap on startup
FileWriteBuffer *Next() const noexcept { return next; }
void SetNext(FileWriteBuffer *n) noexcept { next = n; }
char *_ecv_array Data() noexcept { return buf; }
const char *_ecv_array Data() const noexcept { return buf; }
const size_t BytesStored() const noexcept { return index; }
const size_t BytesLeft() const noexcept { return fileWriteBufLen - index; }
size_t Store(const char *data, size_t length) noexcept; // Stores some data and returns how much could be stored
void DataTaken() noexcept { index = 0; } // Called to indicate that the buffer has been written to the SD card
void DataStored(size_t numBytes) noexcept { index += numBytes; } // Called when more data has been stored directly in the buffer
private:
static size_t fileWriteBufLen;
FileWriteBuffer *next;
size_t index;
#if SAME70
char *_ecv_array buf;
#else
alignas(4) char buf[FileWriteBufLen]; // 32-bit aligned buffer for better HSMCI performance
#endif
};
inline size_t FileWriteBuffer::Store(const char *data, size_t length) noexcept
{
size_t bytesToStore = min<size_t>(BytesLeft(), length);
memcpy(buf + index, data, bytesToStore);
index += bytesToStore;
return bytesToStore;
}
#endif
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