mi mi / Mbed 2 deprecated wave_player_super_lite

16bit resolution PWM wave player with SD card, super lite version.

Dependencies:   mbed DirectSPI FastPWM

Supported boards (confirmed):
Nucleo-F030R8
Nucleo-L152RE
Nucleo-F401RE
Nucleo-F411RE

Only compilation is OK (unchecked, but may work):
Nucleo-L073RZ
Nucleo-F334R8
Nucleo-F303RE
Nucleo-F429ZI
Nucleo-F446RE
Nucleo-F446ZE
Nucleo-L476RG

Supported SD card:
SDSC/SDHC card,
FAT16 and FAT32.
(1) At first, format SD card using SD Card Formatter
https://www.sdcard.org/downloads/formatter_4/index.html
(2) Copy PCM wav files to the SD card.
Supported file:
PCM wave file that have file extension ".wav" on root directory.
16bit/8bit, fs(sampling rate)=32kHz,44.1kHz,48kHz.
Stereo/Mono.

Hardware setting:
Refer to the file port_setting.txt
PWM output port:
Left upper(Hi) PWM 8bit out: PB_5 (TM3_CH2)
Right upper(Hi) PWM 8bit out: PB4 (TM3_CH1)
Left lower(Low) PWM 8bit out: PC_9 (TM3_CH4)
Right lower(Low) PWM 8bit out: PC_8 (TM3_CH3)
http://mpu.up.seesaa.net/image/16bit-wave-player-output-schema.png
USER_BUTTON: PC_13(default button)
Next song: One click in Play mode.
Pause : Push long time .
Play : One click from Pause.

Diff: wave_player_main.cpp

Revision:
19:54aed6200a35
Parent:
18:082bce602af9
Child:
20:c7066a530b1f
--- a/wave_player_main.cpp	Sat Feb 23 21:12:14 2019 +0900
+++ b/wave_player_main.cpp	Wed Sep 16 20:36:42 2020 +0900
@@ -29,7 +29,7 @@
 word  lwReadCount;
 byte  lbSample_bits = 16;
 byte  lbCh_mode     = CH_STEREO;
-byte  bVolumeUpFactor;
+byte  bGainNormalizeFactor;
 bool  fPlaying = false;
 
 DigitalIn btn_bit_now(USER_BUTTON,PullUp);
@@ -72,11 +72,16 @@
                     }
                 }
             #endif
+            //# Gain up
+            dword wL = (((word)bL_hi)<<8) + bL_low;
+            dword wR = (((word)bR_hi)<<8) + bR_low;
+            wL <<= bGainNormalizeFactor;
+            wR <<= bGainNormalizeFactor;
             //# change  pwm duties
-            pwm_dutyL_hi(  ((word)bL_hi)  << bVolumeUpFactor );
-            pwm_dutyL_low( ((word)bL_low) << bVolumeUpFactor );
-            pwm_dutyR_hi(  ((word)bR_hi)  << bVolumeUpFactor );
-            pwm_dutyR_low( ((word)bR_low) << bVolumeUpFactor );
+            pwm_dutyL_hi(  wL >> 8);
+            pwm_dutyL_low( wL & 0xff);
+            pwm_dutyR_hi(  wR >> 8);
+            pwm_dutyR_low( wR & 0xff);
 
         #else // not PWM16BIT
             word wL =0,wR = 0;
@@ -90,10 +95,10 @@
             }
             #if DATA_8BIT_SUPPORT
                 else {                                            /* 8bit data */
-                    wL = wR = send_ff() << bVolumeUpFactor;
+                    wL = wR = send_ff() << bGainNormalizeFactor;
                     lwReadCount -= 1;
                     if( lbCh_mode == CH_STEREO ) {                /* for stereo */
-                        wR = send_ff() << bVolumeUpFactor;
+                        wR = send_ff() << bGainNormalizeFactor;
                         lwReadCount -= 1;
                     }
                 }
@@ -127,7 +132,7 @@
  wave_player_main
 *******************/
 void wave_player_main(){
-    bVolumeUpFactor = calcPcmValidBits() - 8;
+    bGainNormalizeFactor = calcPcmValidBits() - 8;
     word wBtnLowCount = 0;
     #if HAVE_LED_IND_BLINK
         byte bTimeout_led = 0;