From e02b06672c273ce16d37f0d90da2106ef0fc80bd Mon Sep 17 00:00:00 2001
From: Timm <saeugetier@googlemail.com>
Date: Thu, 24 Oct 2019 19:28:41 +0200
Subject: [PATCH] Increase MMU2 serial buffer size with USB serial (#15646)
---
Marlin/src/feature/prusa_MMU2/mmu2.cpp | 2 +-
Marlin/src/feature/prusa_MMU2/mmu2.h | 10 +++++++++-
2 files changed, 10 insertions(+), 2 deletions(-)
diff --git a/Marlin/src/feature/prusa_MMU2/mmu2.cpp b/Marlin/src/feature/prusa_MMU2/mmu2.cpp
index 66b3877f0c..d101cf7f93 100644
--- a/Marlin/src/feature/prusa_MMU2/mmu2.cpp
+++ b/Marlin/src/feature/prusa_MMU2/mmu2.cpp
@@ -97,7 +97,7 @@ volatile int8_t MMU2::finda = 1;
volatile bool MMU2::finda_runout_valid;
int16_t MMU2::version = -1, MMU2::buildnr = -1;
millis_t MMU2::last_request, MMU2::next_P0_request;
-char MMU2::rx_buffer[16], MMU2::tx_buffer[16];
+char MMU2::rx_buffer[MMU_RX_SIZE], MMU2::tx_buffer[MMU_TX_SIZE];
#if HAS_LCD_MENU && ENABLED(MMU2_MENUS)
diff --git a/Marlin/src/feature/prusa_MMU2/mmu2.h b/Marlin/src/feature/prusa_MMU2/mmu2.h
index e102481c19..9628c4be7f 100644
--- a/Marlin/src/feature/prusa_MMU2/mmu2.h
+++ b/Marlin/src/feature/prusa_MMU2/mmu2.h
@@ -27,6 +27,14 @@
#include "../runout.h"
#endif
+#if SERIAL_USB
+ #define MMU_RX_SIZE 256
+ #define MMU_TX_SIZE 256
+#else
+ #define MMU_RX_SIZE 16
+ #define MMU_TX_SIZE 16
+#endif
+
struct E_Step;
class MMU2 {
@@ -79,7 +87,7 @@ private:
static volatile bool finda_runout_valid;
static int16_t version, buildnr;
static millis_t last_request, next_P0_request;
- static char rx_buffer[16], tx_buffer[16];
+ static char rx_buffer[MMU_RX_SIZE], tx_buffer[MMU_TX_SIZE];
static inline void set_runout_valid(const bool valid) {
finda_runout_valid = valid;
--
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