Read data from the server (simulate DMA peripheral-to-memory transfer). This method is called when VSI Timer overflow occurs. Args: size: Number of bytes to read (multiple of 4). Returns: data: Bytearray of audio data.
(size)
| 298 | |
| 299 | |
| 300 | def rdDataDMA(size): |
| 301 | """ |
| 302 | Read data from the server (simulate DMA peripheral-to-memory transfer). |
| 303 | |
| 304 | This method is called when VSI Timer overflow occurs. |
| 305 | Args: |
| 306 | size: Number of bytes to read (multiple of 4). |
| 307 | Returns: |
| 308 | data: Bytearray of audio data. |
| 309 | """ |
| 310 | global STATUS |
| 311 | |
| 312 | if (STATUS & STATUS_ACTIVE_Msk) != 0: |
| 313 | |
| 314 | data, eos = Audio.readAudio(size) |
| 315 | if eos: |
| 316 | STATUS |= STATUS_EOS_Msk |
| 317 | logger.debug("rdDataDMA: STATUS register updated: EOS bit set") |
| 318 | else: |
| 319 | data = bytearray() |
| 320 | |
| 321 | # Set DATA bit after the block of data is read |
| 322 | STATUS |= STATUS_DATA_Msk |
| 323 | logger.debug("rdDataDMA: STATUS register updated: DATA bit set") |
| 324 | |
| 325 | return data |
| 326 | |
| 327 | |
| 328 | def wrDataDMA(data, size): |