Added warning messages when defining a smaller does not have an effect

Author: tomcombriat

internal/config_checks_esp32.h

@@ -220,6 +220,9 @@ MOZZI_CHECK_SUPPORTED(MOZZI_AUDIO_INPUT, MOZZI_AUDIO_INPUT_NONE)
 // All modes besides timed external bypass the output buffer!
 #if !MOZZI_IS(MOZZI_AUDIO_MODE, MOZZI_OUTPUT_EXTERNAL_TIMED, MOZZI_OUTPUT_INTERNAL_DAC, MOZZI_OUTPUT_PWM)
 #  define BYPASS_MOZZI_OUTPUT_BUFFER true
+#if (MOZZI_OUTPUT_BUFFER_SIZE != 256)
+#  warning MOZZI_OUTPUT_BUFFER_SIZE does not have an effect in this mode.
+#endif
 #endif
 
 #define MOZZI__INTERNAL_ANALOG_READ_RESOLUTION 12

internal/config_checks_esp8266.h

@@ -114,6 +114,9 @@ MOZZI_CHECK_SUPPORTED(MOZZI_AUDIO_BITS, 16)
 // esp. since i2s output already has output rate control -> no need for a
 // separate output timer
 #define BYPASS_MOZZI_OUTPUT_BUFFER true
+#if (MOZZI_OUTPUT_BUFFER_SIZE != 256)
+#  warning MOZZI_OUTPUT_BUFFER_SIZE does not have an effect in this mode.
+#endif
 #endif
 
 #define MOZZI__INTERNAL_ANALOG_READ_RESOLUTION 10

internal/config_checks_mbed.h

@@ -117,9 +117,12 @@ MOZZI_CHECK_SUPPORTED(MOZZI_AUDIO_INPUT, MOZZI_AUDIO_INPUT_NONE, MOZZI_AUDIO_INP
 #  endif
 #endif
 
-// All modes besides timed external bypass the output buffer!
+// All modes besides timed external bypass the output buffer! In these modes, the buffer size is not configurable at the moment: throw an error if the user tries to change it.
 #if !MOZZI_IS(MOZZI_AUDIO_MODE, MOZZI_OUTPUT_EXTERNAL_TIMED)
 #  define BYPASS_MOZZI_OUTPUT_BUFFER true
+#  if (MOZZI_OUTPUT_BUFFER_SIZE != 256) // has been modified
+#    warning MOZZI_OUTPUT_BUFFER_SIZE does not have an effect in this mode.
+#  endif
 #endif
 
 // TODO: This value is correct for Arduino Giga and Arduino Portenta, but not necessarily everywhere else

internal/config_checks_rp2040.h

@@ -95,7 +95,12 @@ MOZZI_CHECK_SUPPORTED(MOZZI_AUDIO_MODE, MOZZI_OUTPUT_EXTERNAL_TIMED, MOZZI_OUTPU
 #  endif
 #  define BYPASS_MOZZI_OUTPUT_BUFFER true
 #  define MOZZI_RP2040_BUFFERS 8       // number of DMA buffers used
-#  define MOZZI_RP2040_BUFFER_SIZE 256  // total size of the buffer, in samples
+#  if !defined MOZZI_RP2040_BUFFER_SIZE
+#    define MOZZI_RP2040_BUFFER_SIZE MOZZI_OUTPUT_BUFFER_SIZE  // total size of the buffer, in samples
+#    if (MOZZI_OUTPUT_BUFFER_SIZE < MOZZI_RP2040_BUFFERS)
+#      error MOZZI_OUTPUT_BUFFER_SIZE cannot be lower than 8 on this platform at the moment
+#    endif
+#  endif
 #endif
 
 #if MOZZI_IS(MOZZI_AUDIO_MODE, MOZZI_OUTPUT_I2S_DAC)
@@ -115,7 +120,12 @@ MOZZI_CHECK_SUPPORTED(MOZZI_AUDIO_MODE, MOZZI_OUTPUT_EXTERNAL_TIMED, MOZZI_OUTPU
 MOZZI_CHECK_SUPPORTED(MOZZI_I2S_FORMAT, MOZZI_I2S_FORMAT_PLAIN, MOZZI_I2S_FORMAT_LSBJ)
 #  define BYPASS_MOZZI_OUTPUT_BUFFER true
 #  define MOZZI_RP2040_BUFFERS 8       // number of DMA buffers used
-#  define MOZZI_RP2040_BUFFER_SIZE 256  // total size of the buffer, in samples
+#  if !defined MOZZI_RP2040_BUFFER_SIZE
+#    define MOZZI_RP2040_BUFFER_SIZE MOZZI_OUTPUT_BUFFER_SIZE  // total size of the buffer, in samples
+#    if (MOZZI_OUTPUT_BUFFER_SIZE < MOZZI_RP2040_BUFFERS)
+#      error MOZZI_OUTPUT_BUFFER_SIZE cannot be lower than 8 on this platform at the moment
+#    endif
+#  endif
 #endif
 
 #if !defined(MOZZI_ANALOG_READ)