Seeed xiao rp2040 with dfplayer (mp3 mudule)

Products & Technology RP2040
#1

with uno, works well.

any sample code ?
i’m using xiao rp2040 v1.0

 /*
 * @file Voice Module.ino
 * @brief
 * @n [Get the module here]
 * @n This example Set the voice module volume and playback
 * @n [Connection and Diagram]()
 *
 * @copyright  [DFRobot](https://www.dfrobot.com), 2016
 * @copyright GNU Lesser General Public License
 *
 * @author [carl]([email protected])
 * @version  V1.0
 * @date  2017-11-3
 */

unsigned char order[4] = {0xAA,0x06,0x00,0xB0};


void setup() {
 Serial.begin(9600);
    while (!Serial);
 volume(0x1E);//Volume settings 0x00-0x1E
}


void loop() {
 play(0x01);//Play the specified audio:0x01-file0001
// Serial1.write(order,4);//order play
 delay(2000);
}

void play(unsigned char Track)
{
 unsigned char play[6] = {0xAA,0x07,0x02,0x00,Track,Track+0xB3};
   Serial.write(play,6);
}
void volume( unsigned char vol)
{
  unsigned char volume[5] = {0xAA,0x13,0x01,vol,vol+0xBE};
     Serial.write(volume,5);
 }

didn’t work with D6 D7 pins.
actually, i’m so new of this. also dont’t know so much about serial.
softwareserial.h can be use?
how to figure out tx, rx works collectly?
thanks, sorry for poor english.

#2

The D6/D7 serial port on the XIAO RP2040 is Serial1 and you should not use Serial.

/*
 * @file Voice Module.ino
 * @brief
 * @n [Get the module here]
 * @n This example Set the voice module volume and playback
 * @n [Connection and Diagram]()
 *
 * @copyright  [DFRobot](https://www.dfrobot.com), 2016
 * @copyright GNU Lesser General Public License
 *
 * @author [carl]([email protected])
 * @version  V1.0
 * @date  2017-11-3
 */
unsigned char order[4] = {0xAA,0x06,0x00,0xB0};


void setup() {
//Serial.begin(115200);
 Serial1.begin(9600);
 volume(0x1E);//Volume settings 0x00-0x1E
}


void loop() {
 play(0x01);//Play the specified audio:0x01-file0001
// Serial1.write(order,4);//order play
 delay(2000);
}

void play(unsigned char Track)
{
 unsigned char play[6] = {0xAA,0x07,0x02,0x00,Track,Track+0xB3};
   Serial1.write(play,6);
}
void volume( unsigned char vol)
{
  unsigned char volume[5] = {0xAA,0x13,0x01,vol,vol+0xBE};
     Serial1.write(volume,5);
 }