From 67e30fa91e12b452c1a18f6c5eb8a33cdb9ec625 Mon Sep 17 00:00:00 2001
From: jaseg <git@jaseg.de>
Date: Sat, 30 Sep 2023 18:25:10 +0200
Subject: 8b/10b tx/rx works

---
 driver_fw/src/main.c | 16 ++++++++++++----
 1 file changed, 12 insertions(+), 4 deletions(-)

(limited to 'driver_fw/src')

diff --git a/driver_fw/src/main.c b/driver_fw/src/main.c
index 52b4a4d..0b3c869 100644
--- a/driver_fw/src/main.c
+++ b/driver_fw/src/main.c
@@ -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 --;
     }
 }
 
-- 
cgit