From 49b1d30ab9e7c6f7dcffac633fc5aa5022a849cf Mon Sep 17 00:00:00 2001
From: Alexandre Bourdiol <alexandre.bourdiol@st.com>
Date: Fri, 3 Jan 2020 17:35:44 +0100
Subject: [PATCH] I2C: allow static redefinition of buffer size
Default buffer size is still 32,
but it is now possible to redefine compilation switch: I2C_TXRX_BUFFER_SIZE
It's maximum value is 255
---
libraries/Wire/src/utility/twi.h | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/libraries/Wire/src/utility/twi.h b/libraries/Wire/src/utility/twi.h
index c686998807..07d22a0949 100644
--- a/libraries/Wire/src/utility/twi.h
+++ b/libraries/Wire/src/utility/twi.h
@@ -61,7 +61,11 @@ extern "C" {
#endif
/* I2C Tx/Rx buffer size */
+#if !defined(I2C_TXRX_BUFFER_SIZE)
#define I2C_TXRX_BUFFER_SIZE 32
+#elif (I2C_TXRX_BUFFER_SIZE >= 256)
+#error I2C buffer size cannot exceed 255
+#endif
/* Redefinition of IRQ for F0/G0/L0 families */
#if defined(STM32F0xx) || defined(STM32G0xx) || defined(STM32L0xx)