From aaca3eccf12d4b6ea6e294af81c8d19ad330be0c Mon Sep 17 00:00:00 2001
From: Jeff Epler <jepler@gmail.com>
Date: Thu, 19 Nov 2020 16:19:37 -0600
Subject: [PATCH] samd: PDMIn: Reduce code unrolling on samd21 only

Instead of unrolling the code 16 times, unroll it 4 times and loop
over it 4 times.  This gives the same 16 iterations, but at an expense
of less flash space.
---
 ports/atmel-samd/common-hal/audiobusio/PDMIn.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/ports/atmel-samd/common-hal/audiobusio/PDMIn.c b/ports/atmel-samd/common-hal/audiobusio/PDMIn.c
index 3c9ec05c25..8911aef2f1 100644
--- a/ports/atmel-samd/common-hal/audiobusio/PDMIn.c
+++ b/ports/atmel-samd/common-hal/audiobusio/PDMIn.c
@@ -337,7 +337,11 @@ const uint16_t sinc_filter [OVERSAMPLING] = {
     94, 63, 39, 21, 9, 2, 0, 0
 };
 
-#define REPEAT_16_TIMES(X) X X X X X X X X X X X X X X X X
+#ifdef SAMD21
+#define REPEAT_16_TIMES(X) do { for(uint8_t j=0; j<4; j++) { X X X X } } while (0)
+#else
+#define REPEAT_16_TIMES(X) do { X X X X X X X X X X X X X X X X } while(0)
+#endif
 
 static uint16_t filter_sample(uint32_t pdm_samples[4]) {
     uint16_t running_sum = 0;
@@ -354,7 +358,7 @@ static uint16_t filter_sample(uint32_t pdm_samples[4]) {
                 filter_ptr++;
                 pdm_sample <<= 1;
             }
-            )
+            );
     }
     return running_sum;
 }