diff options
| -rw-r--r-- | core/qtserialbluetooth.cpp | 15 |
1 files changed, 13 insertions, 2 deletions
diff --git a/core/qtserialbluetooth.cpp b/core/qtserialbluetooth.cpp index ca721d78c..8e5fac499 100644 --- a/core/qtserialbluetooth.cpp +++ b/core/qtserialbluetooth.cpp @@ -169,15 +169,26 @@ static dc_status_t ble_serial_write(dc_custom_io_t *io, const void* data, size_t size_t transferred = 0; ble_serial_flush_read(); + + /* + * Most writes to a connected DC are small, typically some command bytes to get + * DC in download mode, or to set some parameter. All this just worked over BLE, + * however, sending a full firmware update (on an OSTC device) failed, as the + * underlying BLE interface can only handle small 20 byte BLE packets at once. + * + * So, send max ble->packet_size chuncks at once. + */ while (size) { - size_t len = sizeof(buffer.out) - buffer.out_bytes; + size_t len = sizeof(buffer.out) - transferred; + if (len > io->packet_size) + len = io->packet_size; if (len > size) len = size; memcpy(buffer.out + buffer.out_bytes, data, len); buffer.out_bytes += len; - if (buffer.out_bytes == sizeof(buffer.out)) { + if (buffer.out_bytes <= io->packet_size || buffer.out_bytes == size) { rc = ble_serial_flush_write(); if (rc != DC_STATUS_SUCCESS) break; |