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8b/10b tx/rx works

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jaseg 2023-09-30 18:25:10 +02:00
parent ee1d1bd0c2
commit 67e30fa91e
4 changed files with 126 additions and 10 deletions
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105
center_fw/match_test.ipynb
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File diff suppressed because one or more lines are too long

12
center_fw/src/main.c
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@ -124,7 +124,7 @@ void TIM1_CC_IRQHandler(void) {
}
*/
static size_t received_symbols = 0;
static int symbol_buf[32];
static int symbol_buf[64];
static size_t received_bits = 0;
static int16_t bit_buf[256];
size_t adc_reduced_pos = 0;
@ -145,16 +145,13 @@ void DMA1_Channel1_IRQHandler(void) {
int sample = buf[i];
adc_reduced[adc_reduced_pos] = (sample & 0xffff)>>9;
if (adc_reduced_pos == 0) {
asm volatile ("bkpt");
}
if ((last_sample <= threshold_adc_counts && sample >= threshold_adc_counts) ||
(last_sample >= threshold_adc_counts && sample <= threshold_adc_counts)){
sampling_phase = sample_per_baud / 4; /* /2 for half baud sampling point, /2 for sinusoidal edge shape */
} else if (sampling_phase == 0) {
int bit = sample < threshold_adc_counts;
int bit = sample > threshold_adc_counts;
adc_reduced[adc_reduced_pos] |= 0x80;
bit_buf[received_bits] = bit;
@ -171,7 +168,10 @@ void DMA1_Channel1_IRQHandler(void) {
sampling_phase--;
}
adc_reduced_pos = (adc_reduced_pos+1) % COUNT_OF(adc_reduced);
adc_reduced_pos++;
if (adc_reduced_pos == COUNT_OF(adc_reduced)) {
adc_reduced_pos =0;
}
last_sample = sample;
}

3
common/8b10b_test_vector_gen.py
View file

@ -1,6 +1,9 @@
#!/usr/bin/env python3
def parse_size(s):
if s is None:
return s
s = s.lower()
SUFFIXES = {'k': 1e3, 'm': 1e6, 'g': 1e9}
if s[-1] in SUFFIXES:

16
driver_fw/src/main.c
View file

@ -202,6 +202,9 @@ void dma_tx_constant(size_t table_size, uint16_t constant) {
DMA1_Channel1->CCR |= DMA_CCR_EN;
}
int8_t bit_arr[4096];
size_t bit_pos = 0;
void DMA1_Channel1_IRQHandler() {
static int transfer_errors = 0;
static int current_symbol = 0x2aa;
@ -213,6 +216,10 @@ void DMA1_Channel1_IRQHandler() {
DMA1->IFCR = DMA_IFCR_CGIF1;
int bit = !!(current_symbol & (1<<tx_bitpos));
bit_arr[bit_pos++] = bit;
if (bit_pos == COUNT_OF(bit_arr)) {
bit_pos = 0;
}
if (tx_last_bit == bit) {
dma_tx_constant(COUNT_OF(waveform_zero_one), bit ? WAVEFORM_CONST_ONE : WAVEFORM_CONST_ZERO);
@ -224,14 +231,15 @@ void DMA1_Channel1_IRQHandler() {
tx_last_bit = bit;
tx_bitpos ++;
if (tx_bitpos >= 10) {
tx_bitpos = 0;
tx_sympos ++;
if (tx_bitpos == 0) {
tx_bitpos = 9;
current_symbol = xfr_8b10b_encode(&encoder_state_8b10b, tx_datagram[tx_sympos]);
tx_sympos ++;
if (tx_sympos >= COUNT_OF(tx_datagram)) {
tx_sympos = 0;
}
} else {
tx_bitpos --;
}
}