From 2ff87878a83b02ee86901a3d152dd46ad234b7df Mon Sep 17 00:00:00 2001
From: Matt Jenkins <matt@majenko.co.uk>
Date: Wed, 3 Sep 2025 23:28:12 +0100
Subject: [PATCH] Reversed bit ordering to make more sense

---
 firmware/Test/Test.ino       | 9 +++++----
 firmware/Test/datastream.pio | 5 ++++-
 2 files changed, 9 insertions(+), 5 deletions(-)

diff --git a/firmware/Test/Test.ino b/firmware/Test/Test.ino
index 0fd20bf..93bcc7e 100644
--- a/firmware/Test/Test.ino
+++ b/firmware/Test/Test.ino
@@ -89,12 +89,12 @@ uint16_t mfm_encode_bit(uint8_t b) {
 
 	if (b == 0x80) {
 		last_bit = 1;
-		return 0b1000000000000000;
+		return 0b01;
 	}
 
 
 	if (last_bit == 0) {
-		return 0b0100000000000000;
+		return 0b10;
 	} else {
 		last_bit = 0;
 		return 0b00;
@@ -109,7 +109,7 @@ uint16_t mfm_encode(uint8_t b) {
 	//Serial.println(b, HEX);
 
 	for (int i = 0; i < 8; i++) {
-		out >>= 2;
+		out <<= 2;
 		//Serial.println(b, BIN);
 		out |= mfm_encode_bit(b & 0x80);
 		b <<= 1;
@@ -155,7 +155,8 @@ void loop() {
 	header_crc = 0xFFFF;
 	header_crc = crc16(0xA1, header_crc);
 	uint16_t sync = mfm_encode(0xA1);
-	sync &= 0b1111101111111111;
+	//sync &= 0b1111101111111111;
+	sync &= 0b1111111111011111;
 
 	pio->txf[sm] = sync;
 	csend(0xFE);
diff --git a/firmware/Test/datastream.pio b/firmware/Test/datastream.pio
index f48c6fb..c8ba6b8 100644
--- a/firmware/Test/datastream.pio
+++ b/firmware/Test/datastream.pio
@@ -7,6 +7,7 @@ public start:
 
 .wrap_target
 	PULL noblock
+	OUT NULL, 16
 
 	SET Y,6
 loop:
@@ -19,7 +20,7 @@ loop:
 	OUT PINS,1 [14]
 	SET PINS,0 [14]
 	OUT PINS,1 [14]
-	SET PINS,0 [12]
+	SET PINS,0 [11]
 
 .wrap
 
@@ -30,6 +31,8 @@ static inline void datastream_program_init(PIO pio, uint sm, uint offset) {
 	pio_gpio_init(pio, 12);
 	pio_sm_set_consecutive_pindirs(pio, sm, 12, 1, true);
 	pio_sm_config c = datastream_program_get_default_config(offset);
+	sm_config_set_out_shift(&c, false, false, 0);
+	sm_config_set_fifo_join(&c, PIO_FIFO_JOIN_TX);
 	sm_config_set_clkdiv(&c, 1.0);
     sm_config_set_out_pin_base(&c, 12);
     sm_config_set_out_pin_count(&c, 1);