Exemple #1
0
bool m25p16_waitForReady(uint32_t timeoutMillis)
{
    uint32_t time = millis();
    while (!m25p16_isReady()) {
        if (millis() - time > timeoutMillis) {
            return false;
        }
    }

    return true;
}
Exemple #2
0
/**
 * Write the given buffers to flash sequentially at the current tail address, advancing the tail address after
 * each write.
 *
 * In synchronous mode, waits for the flash to become ready before writing so that every byte requested can be written.
 *
 * In asynchronous mode, if the flash is busy, then the write is aborted and the routine returns immediately.
 * In this case the returned number of bytes written will be less than the total amount requested.
 *
 * Modifies the supplied buffer pointers and sizes to reflect how many bytes remain in each of them.
 *
 * bufferCount: the number of buffers provided
 * buffers: an array of pointers to the beginning of buffers
 * bufferSizes: an array of the sizes of those buffers
 * sync: true if we should wait for the device to be idle before writes, otherwise if the device is busy the
 *       write will be aborted and this routine will return immediately.
 *
 * Returns the number of bytes written
 */
static uint32_t flashfsWriteBuffers(uint8_t const **buffers, uint32_t *bufferSizes, int bufferCount, bool sync)
{
    uint32_t bytesTotal = 0;

    int i;

    for (i = 0; i < bufferCount; i++) {
        bytesTotal += bufferSizes[i];
    }

    if (!sync && !m25p16_isReady()) {
        return 0;
    }

    uint32_t bytesTotalRemaining = bytesTotal;

    while (bytesTotalRemaining > 0) {
        uint32_t bytesTotalThisIteration;
        uint32_t bytesRemainThisIteration;

        /*
         * Each page needs to be saved in a separate program operation, so
         * if we would cross a page boundary, only write up to the boundary in this iteration:
         */
        if (tailAddress % M25P16_PAGESIZE + bytesTotalRemaining > M25P16_PAGESIZE) {
            bytesTotalThisIteration = M25P16_PAGESIZE - tailAddress % M25P16_PAGESIZE;
        } else {
            bytesTotalThisIteration = bytesTotalRemaining;
        }

        // Are we at EOF already? Abort.
        if (flashfsIsEOF()) {
            // May as well throw away any buffered data
            flashfsClearBuffer();

            break;
        }

        m25p16_pageProgramBegin(tailAddress);

        bytesRemainThisIteration = bytesTotalThisIteration;

        for (i = 0; i < bufferCount; i++) {
            if (bufferSizes[i] > 0) {
                // Is buffer larger than our write limit? Write our limit out of it
                if (bufferSizes[i] >= bytesRemainThisIteration) {
                    m25p16_pageProgramContinue(buffers[i], bytesRemainThisIteration);

                    buffers[i] += bytesRemainThisIteration;
                    bufferSizes[i] -= bytesRemainThisIteration;

                    bytesRemainThisIteration = 0;
                    break;
                } else {
                    // We'll still have more to write after finishing this buffer off
                    m25p16_pageProgramContinue(buffers[i], bufferSizes[i]);

                    bytesRemainThisIteration -= bufferSizes[i];

                    buffers[i] += bufferSizes[i];
                    bufferSizes[i] = 0;
                }
            }
        }

        m25p16_pageProgramFinish();

        bytesTotalRemaining -= bytesTotalThisIteration;

        // Advance the cursor in the file system to match the bytes we wrote
        flashfsSetTailAddress(tailAddress + bytesTotalThisIteration);

        /*
         * We'll have to wait for that write to complete before we can issue the next one, so if
         * the user requested asynchronous writes, break now.
         */
        if (!sync)
            break;
    }

    return bytesTotal - bytesTotalRemaining;
}
Exemple #3
0
/**
 * Return true if the flash is not currently occupied with an operation.
 */
bool flashfsIsReady()
{
    return m25p16_isReady();
}