Awkward Problems in Sending MP3 via Serial Port-EEWORLD

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Recently, I plan to build a device that sends MP3 file data from the PC serial port to STM32, and then STM32 compresses the data and sends it to vs1003 to decode and play the sound. The previous method was to read the file in the SD card through SPI and then send it out through SPI. Both methods are based on STM32 and then ask for data from two SPI devices and send data respectively. This method is very simple to implement. However, if the serial port is changed to send music data, then STM32 is very passive and must enter interrupts to stop other activities at all times. In this way, when sending voice data to vs003, the data has not been sent, and an interrupt hits, and it crashes. I tried to enter the interrupt directly and send the data to vs1003 in the interrupt, but in fact, the effect is better than before, but it is intermittent, which must be due to the asynchronous decoding and large time difference.

I was thinking, if there is no interruption, it must be a byte received, then there will be 512 interruptions in total to count as a full packet, and then send this packet to vs1003. If 512 bytes are sent before the next interruption, there will be 511 interruptions left, and vs1003 must be interrupted during this period. If the music is sent out before the 511th interruption, it will sound 512 times again, but it will still be intermittent, but it seems more coherent than before.

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MP3 complete circuit diagram

MP3 complete circuit diagram:

[Analog Electronics]

Chinese menu MP3 song selector based on SC95F8616 microcontroller (2)

3.Key recognition Since the key recognizes the low level of the corresponding scan, P07 is set to output a low level. 1 ) Complete the program flow modification as shown in Figure 16 and make corresponding configuration modifications. Figure 16 Program flow Figure 17 Modify configurati

[Microcontroller]

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