MajenkoProjects/RTmFM
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Reversed bit ordering to make more sense

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This commit is contained in:
Matt Jenkins
2025-09-03 23:28:12 +01:00
parent 55960de530
commit 2ff87878a8
2 changed files with 9 additions and 5 deletions
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9
firmware/Test/Test.ino
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@@ -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);

5
firmware/Test/datastream.pio
View File

@@ -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);