add DMAMEM, fix warnings

input_i2s.cpp

 #include "input_i2s.h"
 #include "output_i2s.h"
 
-static uint32_t i2s_rx_buffer[AUDIO_BLOCK_SAMPLES];
+DMAMEM __attribute__((aligned(32))) static uint32_t i2s_rx_buffer[AUDIO_BLOCK_SAMPLES];
 audio_block_t * AudioInputI2S::block_left = NULL;
 audio_block_t * AudioInputI2S::block_right = NULL;
 uint16_t AudioInputI2S::block_offset = 0;

input_i2s2.cpp

 #include "input_i2s2.h"
 #include "output_i2s2.h"
 
-static uint32_t i2s2_rx_buffer[AUDIO_BLOCK_SAMPLES];
+DMAMEM __attribute__((aligned(32))) static uint32_t i2s2_rx_buffer[AUDIO_BLOCK_SAMPLES];
 audio_block_t * AudioInputI2S2::block_left = NULL;
 audio_block_t * AudioInputI2S2::block_right = NULL;
 uint16_t AudioInputI2S2::block_offset = 0;

input_i2s_hex.cpp

 	if (block_ch1) {
 		offset = block_offset;
 		if (offset <= AUDIO_BLOCK_SAMPLES/2) {
-			arm_dcache_delete(src, sizeof(i2s_rx_buffer) / 2);
+			arm_dcache_delete((void*)src, sizeof(i2s_rx_buffer) / 2);
 			block_offset = offset + AUDIO_BLOCK_SAMPLES/2;
 			dest1 = &(block_ch1->data[offset]);
 			dest2 = &(block_ch2->data[offset]);

input_i2s_quad.cpp

 	if (block_ch1) {
 		offset = block_offset;
 		if (offset <= AUDIO_BLOCK_SAMPLES/2) {
-			arm_dcache_delete(src, sizeof(i2s_rx_buffer) / 2);
+			arm_dcache_delete((void*)src, sizeof(i2s_rx_buffer) / 2);
 			block_offset = offset + AUDIO_BLOCK_SAMPLES/2;
 			dest1 = &(block_ch1->data[offset]);
 			dest2 = &(block_ch2->data[offset]);