From 708ead241c07998f1c2cf9bbf796e9c109d730d9 Mon Sep 17 00:00:00 2001
From: Steve Markgraf <steve@steve-m.de>
Date: Sun, 5 Jan 2025 01:11:47 +0100
Subject: [PATCH] fix initial ringbuffer head value

As the first two DMA transfers have already been
submitted during init, the correct start value
is 2.
---
 apps/counter/counter.c               | 2 +-
 apps/external_adc/external_adc.c     | 2 +-
 apps/internal_adc/internal_adc.c     | 2 +-
 apps/logic_analyzer/logic_analyzer.c | 2 +-
 4 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/apps/counter/counter.c b/apps/counter/counter.c
index 16d62bd..f0f987b 100644
--- a/apps/counter/counter.c
+++ b/apps/counter/counter.c
@@ -50,7 +50,7 @@
 
 static bool pio_dma_pong = false;
 uint16_t ringbuffer[RBUF_TOTAL_LEN];
-int ringbuf_head = 0;
+int ringbuf_head = 2;
 
 void __scratch_y("") pio_dma_irq_handler()
 {
diff --git a/apps/external_adc/external_adc.c b/apps/external_adc/external_adc.c
index 02d132a..89efaa1 100644
--- a/apps/external_adc/external_adc.c
+++ b/apps/external_adc/external_adc.c
@@ -58,7 +58,7 @@
 
 static bool pio_dma_pong = false;
 uint16_t ringbuffer[RBUF_TOTAL_LEN];
-int ringbuf_head = 0;
+int ringbuf_head = 2;
 
 void __scratch_y("") pio_dma_irq_handler()
 {
diff --git a/apps/internal_adc/internal_adc.c b/apps/internal_adc/internal_adc.c
index 9c52a4f..9e7bdb8 100644
--- a/apps/internal_adc/internal_adc.c
+++ b/apps/internal_adc/internal_adc.c
@@ -55,7 +55,7 @@
 
 static bool dma_adc_pong = false;
 uint16_t ringbuffer[RBUF_TOTAL_LEN];
-int ringbuf_head = 0;
+int ringbuf_head = 2;
 
 void __scratch_y("") adc_dma_irq_handler()
 {
diff --git a/apps/logic_analyzer/logic_analyzer.c b/apps/logic_analyzer/logic_analyzer.c
index d858b4e..6e43d1e 100644
--- a/apps/logic_analyzer/logic_analyzer.c
+++ b/apps/logic_analyzer/logic_analyzer.c
@@ -54,7 +54,7 @@
 
 static bool pio_dma_pong = false;
 uint16_t ringbuffer[RBUF_TOTAL_LEN];
-int ringbuf_head = 0;
+int ringbuf_head = 2;
 
 void __scratch_y("") pio_dma_irq_handler()
 {