This is a sample that drives a speaker with PWM.
Fork of GR-PEACH_Audio_WAV by
This is a sample that drives a speaker with PWM. This sample will play a ".wav" file of the microSD or USB memory root folder. If the USER_BUTTON0 is pressed, the next song is played.
Format | Wav file (RIFF format) ".wav" |
Channel | 1ch and 2ch |
Frequencies | 32kHz, 44.1kHz and 48kHz |
Quantization bit rate | 8bits and 16bits |
You can adjust the volume by changing the following.
main.cpp
AudioPlayer.outputVolume(0.5); // Volume control (min:0.0 max:1.0)
The default setting of serial communication (baud rate etc.) in mbed is shown the following link.
Please refer to the link and change the settings of your PC terminal software.
The default value of baud rate in mbed is 9600, and this application uses baud rate 9600.
https://developer.mbed.org/teams/Renesas/wiki/GR-PEACH-Getting-Started#install-the-usb-serial-communication
main.cpp@13:7e3063fc0e10, 2017-07-06 (annotated)
- Committer:
- dkato
- Date:
- Thu Jul 06 04:50:46 2017 +0000
- Revision:
- 13:7e3063fc0e10
- Parent:
- 11:221c23d820d9
- Child:
- 14:f3eda9558df6
Simplified sample
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
dkato | 0:a24aaf3a41b1 | 1 | #include "mbed.h" |
dkato | 13:7e3063fc0e10 | 2 | #include "EasyPlaybackPWM.h" |
dkato | 13:7e3063fc0e10 | 3 | #include "EasyDec_WavCnv2ch.h" |
dkato | 11:221c23d820d9 | 4 | #include "FATFileSystem.h" |
dkato | 11:221c23d820d9 | 5 | #include "SDBlockDevice_GR_PEACH.h" |
dkato | 11:221c23d820d9 | 6 | #include "USBHostMSD.h" |
dkato | 4:01651a6c3f9a | 7 | |
dkato | 0:a24aaf3a41b1 | 8 | #define FILE_NAME_LEN (64) |
dkato | 9:c7c0a97fdb7f | 9 | #define MOUNT_NAME "storage" |
dkato | 13:7e3063fc0e10 | 10 | #define TAG_BUFF_SIZE (64 + 1) //null-terminated |
dkato | 0:a24aaf3a41b1 | 11 | |
dkato | 13:7e3063fc0e10 | 12 | static InterruptIn skip_btn(USER_BUTTON0); |
dkato | 13:7e3063fc0e10 | 13 | static EasyPlaybackPWM AudioPlayer(P4_5, P4_7); |
dkato | 0:a24aaf3a41b1 | 14 | |
dkato | 13:7e3063fc0e10 | 15 | static void skip_btn_fall(void) { |
dkato | 13:7e3063fc0e10 | 16 | AudioPlayer.skip(); |
dkato | 0:a24aaf3a41b1 | 17 | } |
dkato | 0:a24aaf3a41b1 | 18 | |
dkato | 4:01651a6c3f9a | 19 | int main() { |
dkato | 13:7e3063fc0e10 | 20 | DIR * d; |
dkato | 13:7e3063fc0e10 | 21 | struct dirent * p; |
dkato | 13:7e3063fc0e10 | 22 | char file_path[sizeof("/"MOUNT_NAME"/") + FILE_NAME_LEN]; |
dkato | 13:7e3063fc0e10 | 23 | FATFileSystem fs("storage"); |
dkato | 11:221c23d820d9 | 24 | SDBlockDevice_GR_PEACH sd; |
dkato | 11:221c23d820d9 | 25 | USBHostMSD usb; |
dkato | 11:221c23d820d9 | 26 | |
dkato | 13:7e3063fc0e10 | 27 | // decoder setting |
dkato | 13:7e3063fc0e10 | 28 | AudioPlayer.add_decoder<EasyDec_WavCnv2ch>(".wav"); |
dkato | 13:7e3063fc0e10 | 29 | AudioPlayer.add_decoder<EasyDec_WavCnv2ch>(".WAV"); |
dkato | 13:7e3063fc0e10 | 30 | |
dkato | 13:7e3063fc0e10 | 31 | // volume control |
dkato | 13:7e3063fc0e10 | 32 | AudioPlayer.outputVolume(0.10f); // Volume control (min:0.0 max:1.0) |
dkato | 13:7e3063fc0e10 | 33 | |
dkato | 13:7e3063fc0e10 | 34 | // button setting |
dkato | 13:7e3063fc0e10 | 35 | skip_btn.fall(&skip_btn_fall); |
dkato | 13:7e3063fc0e10 | 36 | |
dkato | 13:7e3063fc0e10 | 37 | // wait for the storage device to be connected |
dkato | 13:7e3063fc0e10 | 38 | printf("Finding a storage...\r\n"); |
dkato | 13:7e3063fc0e10 | 39 | while (1) { |
dkato | 13:7e3063fc0e10 | 40 | if (sd.connect()) { |
dkato | 13:7e3063fc0e10 | 41 | fs.mount(&sd); |
dkato | 13:7e3063fc0e10 | 42 | break; |
dkato | 13:7e3063fc0e10 | 43 | } |
dkato | 13:7e3063fc0e10 | 44 | if (usb.connect()) { |
dkato | 13:7e3063fc0e10 | 45 | fs.mount(&usb); |
dkato | 13:7e3063fc0e10 | 46 | break; |
dkato | 13:7e3063fc0e10 | 47 | } |
dkato | 13:7e3063fc0e10 | 48 | Thread::wait(500); |
dkato | 13:7e3063fc0e10 | 49 | } |
dkato | 13:7e3063fc0e10 | 50 | printf("done\r\n"); |
dkato | 0:a24aaf3a41b1 | 51 | |
dkato | 0:a24aaf3a41b1 | 52 | while(1) { |
dkato | 13:7e3063fc0e10 | 53 | // file search |
dkato | 13:7e3063fc0e10 | 54 | d = opendir("/"MOUNT_NAME"/"); |
dkato | 13:7e3063fc0e10 | 55 | while ((p = readdir(d)) != NULL) { |
dkato | 13:7e3063fc0e10 | 56 | size_t len = strlen(p->d_name); |
dkato | 13:7e3063fc0e10 | 57 | if (len < FILE_NAME_LEN) { |
dkato | 13:7e3063fc0e10 | 58 | // make file path |
dkato | 13:7e3063fc0e10 | 59 | sprintf(file_path, "/%s/%s", MOUNT_NAME, p->d_name); |
dkato | 13:7e3063fc0e10 | 60 | printf("%s\r\n", file_path); |
dkato | 0:a24aaf3a41b1 | 61 | |
dkato | 13:7e3063fc0e10 | 62 | // playback |
dkato | 13:7e3063fc0e10 | 63 | AudioPlayer.play(file_path); |
dkato | 0:a24aaf3a41b1 | 64 | } |
dkato | 0:a24aaf3a41b1 | 65 | } |
dkato | 13:7e3063fc0e10 | 66 | closedir(d); |
dkato | 0:a24aaf3a41b1 | 67 | } |
dkato | 0:a24aaf3a41b1 | 68 | } |
dkato | 13:7e3063fc0e10 | 69 |