Renesas
This sample will play a ".wav" file of the USB root folder. Only RIFF format, 48kHz, 16bit, 2ch.
Dependencies: USBHostDac USBHost_custom_Addiso
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USBHostDac_example
by 
GR-PEACH_producer_meeting
Isochronous transfer sample for GR-PEACH. This sample will play a ".wav" file of the USB root folder. Only RIFF format, 48kHz, 16bit, 2ch.
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
- Reference information
Revision 0:39320363f99f, committed 2015-04-01
- Comitter:
- dkato
- Date:
- Wed Apr 01 10:51:50 2015 +0000
- Child:
- 1:82fe51d45902
- Commit message:
- first commiit
Changed in this revision
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/USBHostDac.lib Wed Apr 01 10:51:50 2015 +0000 @@ -0,0 +1,1 @@ +http://developer.mbed.org/teams/GR-PEACH_producer_meeting/code/USBHostDac/#3a3146f89bcc
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/USBHost_AddIso.lib Wed Apr 01 10:51:50 2015 +0000 @@ -0,0 +1,1 @@ +http://developer.mbed.org/teams/GR-PEACH_producer_meeting/code/USBHost_AddIso/#2851a9b2bbfb
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp Wed Apr 01 10:51:50 2015 +0000
@@ -0,0 +1,187 @@
+#include "mbed.h"
+#include "USBHostDac.h"
+#include "USBHostMSD.h"
+
+DigitalOut led(LED1);
+DigitalIn button(USER_BUTTON0);
+
+#define READ_BUFF_SIZE (4096)
+#define READ_BUFF_NUM (3)
+#define MAIL_QUEUE_SIZE (READ_BUFF_NUM - 1)
+#define FILE_NAME_LEN (64)
+
+typedef struct {
+ uint8_t * p_data;
+ uint32_t data_size;
+ bool flush;
+} mail_t;
+Mail<mail_t, MAIL_QUEUE_SIZE> mail_box;
+
+static uint8_t read_buff[READ_BUFF_NUM][READ_BUFF_SIZE];
+static uint32_t read_buff_no = 0;
+
+void usbdac_task(void const*) {
+ USBHostDac usbdac;
+
+ while(1) {
+
+ // try to connect a usbdac device
+ while(!usbdac.connect()) {
+ Thread::wait(500);
+ }
+
+ // in a loop, print all characters received
+ // if the device is disconnected, we try to connect it again
+ while (1) {
+ // if device disconnected, try to connect it again
+ if (!usbdac.connected()) {
+ break;
+ }
+
+ osEvent evt = mail_box.get();
+ if (evt.status == osEventMail) {
+ mail_t *mail = (mail_t *)evt.value.p;
+ usbdac.send(mail->p_data, mail->data_size, mail->flush);
+ mail_box.free(mail);
+ }
+ }
+ }
+}
+
+static bool analyze_wav_heder(FILE * fp) {
+ bool result = false;
+ size_t read_size;
+ uint8_t wk_read_buff[36];
+ uint32_t fmt_size;
+ uint16_t ch;
+ uint32_t sampling_rate;
+ uint16_t block_size;
+
+ read_size = fread(&wk_read_buff[0], sizeof(char), sizeof(wk_read_buff), fp);
+ if (read_size < sizeof(wk_read_buff)) {
+ // do nothing
+ } else if (memcmp(&wk_read_buff[0], "RIFF", 4) != 0) {
+ // do nothing
+ } else if (memcmp(&wk_read_buff[8], "WAVE", 4) != 0) {
+ // do nothing
+ } else if (memcmp(&wk_read_buff[12], "fmt ", 4) != 0) {
+ // do nothing
+ } else {
+ result = true;
+ fmt_size = ((uint32_t)wk_read_buff[16] << 0)
+ + ((uint32_t)wk_read_buff[17] << 8)
+ + ((uint32_t)wk_read_buff[18] << 16)
+ + ((uint32_t)wk_read_buff[19] << 24);
+ ch = ((uint32_t)wk_read_buff[22] << 0) + ((uint32_t)wk_read_buff[23] << 8);
+ sampling_rate = ((uint32_t)wk_read_buff[24] << 0)
+ + ((uint32_t)wk_read_buff[25] << 8)
+ + ((uint32_t)wk_read_buff[26] << 16)
+ + ((uint32_t)wk_read_buff[27] << 24);
+ block_size = ((uint32_t)wk_read_buff[34] << 0) + ((uint32_t)wk_read_buff[35] << 8);
+
+ if ((ch == 2) && (block_size == 16) && (sampling_rate == 48000)) {
+ fseek(fp, 28 + fmt_size, SEEK_SET);
+ } else {
+ result = false;
+ }
+ }
+
+ return result;
+}
+
+void msd_task(void const *) {
+ FILE * fp = NULL;
+ DIR * d = NULL;
+ char file_path[sizeof("/usb/") + FILE_NAME_LEN];
+
+ USBHostMSD msd("usb");
+
+ while(1) {
+ // try to connect a MSD device
+ while(!msd.connect()) {
+ Thread::wait(500);
+ }
+
+ // in a loop, append a file
+ // if the device is disconnected, we try to connect it again
+ while(1) {
+ // if device disconnected, try to connect again
+ if (!msd.connected()) {
+ break;
+ }
+
+ if (fp == NULL) {
+ // file search
+ if (d == NULL) {
+ d = opendir("/usb/");
+ }
+ struct dirent * p;
+ while ((p = readdir(d)) != NULL) {
+ size_t len = strlen(p->d_name);
+ if ((len > 4) && (len <= FILE_NAME_LEN) && (memcmp(&p->d_name[len - 4], ".wav", 4) == 0)) {
+ strcpy(file_path, "/usb/");
+ strcat(file_path, p->d_name);
+ fp = fopen(file_path, "r");
+ if (analyze_wav_heder(fp) == false) {
+ fclose(fp);
+ fp = NULL;
+ } else {
+ printf("%s\n", p->d_name);
+ break;
+ }
+ }
+ }
+ if (p == NULL) {
+ closedir(d);
+ d = NULL;
+ }
+ } else {
+ // file read
+ size_t read_size = fread(&read_buff[read_buff_no][0], sizeof(char), READ_BUFF_SIZE, fp);
+ if (read_size > 0) {
+ mail_t *mail = mail_box.alloc(osWaitForever);
+ if (mail != NULL) {
+ mail->p_data = &read_buff[read_buff_no][0];
+ mail->data_size = read_size;
+ if (read_size < READ_BUFF_SIZE) {
+ mail->flush = true; // last data
+ } else {
+ mail->flush = false;
+ }
+ mail_box.put(mail);
+ read_buff_no++;
+ if (read_buff_no >= READ_BUFF_NUM) {
+ read_buff_no = 0;
+ }
+ }
+ }
+
+ // file close
+ if ((read_size < READ_BUFF_SIZE) || (button == 0)) {
+ fclose(fp);
+ fp = NULL;
+ Thread::wait(500);
+ }
+ }
+ }
+
+ // close check
+ if (fp != NULL) {
+ fclose(fp);
+ fp = NULL;
+ }
+ if (d != NULL) {
+ closedir(d);
+ d = NULL;
+ }
+ }
+}
+
+int main() {
+ Thread usbdaclTask(usbdac_task, NULL, osPriorityNormal, 1024 * 4);
+ Thread msdTask(msd_task, NULL, osPriorityNormal, 1024 * 4);
+ while(1) {
+ led=!led;
+ Thread::wait(500);
+ }
+}
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/mbed.bld Wed Apr 01 10:51:50 2015 +0000 @@ -0,0 +1,1 @@ +http://mbed.org/users/mbed_official/code/mbed/builds/487b796308b0 \ No newline at end of file