Swap to correct endianness

Author: rhgndf

ch32v305/src/feature/fm_audio_out/fm_audio_out.c

@@ -175,10 +175,10 @@ bool fm_audio_out_process_i2s_words_isr(volatile uint16_t const *src_words, size
     frame_count = word_count / 4U;
     for(i = 0U; i < frame_count; ++i)
     {
-        uint16_t i_hi = src_words[i * 4U + 1U];
-        uint16_t i_lo = src_words[i * 4U + 0U];
-        uint16_t q_hi = src_words[i * 4U + 3U];
-        uint16_t q_lo = src_words[i * 4U + 2U];
+        uint16_t i_hi = src_words[i * 4U + 0U];
+        uint16_t i_lo = src_words[i * 4U + 1U];
+        uint16_t q_hi = src_words[i * 4U + 2U];
+        uint16_t q_lo = src_words[i * 4U + 3U];
         int32_t i_now = (int32_t)(((uint32_t)i_hi << 16) | (uint32_t)i_lo);
         int32_t q_now = (int32_t)(((uint32_t)q_hi << 16) | (uint32_t)q_lo);
 

ch32v305/src/hw/i2s_hw.c

@@ -99,7 +99,7 @@ static void i2s_process_buf(volatile uint16_t const *src_words)
     uint32_t coincidences = 0;
     for(size_t i = 0; i < I2S_RX_DMA_CHUNK_WORDS - 4; i += 2U)
     {
-        uint32_t sample_32 = ((uint32_t)src_words[i + 1U] << 16) | src_words[i];
+        uint32_t sample_32 = ((uint32_t)src_words[i] << 16) | src_words[i + 1U];
         bool first_two_bits_same = (sample_32 >> 31) == ((sample_32 >> 30) & 1);
         bool last_bit_different = (sample_32 >> 31) != (sample_32 & 1);
         coincidences += first_two_bits_same && last_bit_different;
@@ -325,7 +325,7 @@ bool i2s_needs_reset(void)
     if ((s_i2s_reset_coincidences < s_i2s_coincidences_samples / 2 - thres) ||
         (s_i2s_reset_coincidences > s_i2s_coincidences_samples / 2 + thres)) {
         // Is bitslipped, request reset outside the ISR.
-        uint32_t sample_32 = ((uint32_t)s_rx_dma_buf[1] << 16) | s_rx_dma_buf[0];
+        uint32_t sample_32 = ((uint32_t)s_rx_dma_buf[0] << 16) | s_rx_dma_buf[1];
         printf("coincidences: %ld/%ld, thres: %ld, sample: %08lX\n", s_i2s_reset_coincidences, s_i2s_coincidences_samples, thres, sample_32);
         ret = true;
     }

ui/src/lib/data.js

@@ -8,7 +8,10 @@ const IQ_FIXED_POINT_SCALE = 1 / 0x80000000
 const BYTES_PER_MB = 1000 * 1000
 
 function decodeSlotSample(view, offset) {
-  return view.getInt32(offset, true) * IQ_FIXED_POINT_SCALE
+  const hiWord = view.getUint16(offset, true)
+  const loWord = view.getUint16(offset + 2, true)
+  const sample = ((hiWord << 16) | loWord) >> 0
+  return sample * IQ_FIXED_POINT_SCALE
 }
 
 function decodeIqFrames(dataView) {