From 41635e3c68386cbaaf6006d073e3767a4971c962 Mon Sep 17 00:00:00 2001
From: Christian Riggenbach <criggenbach@magahugu.ch>
Date: Mon, 2 May 2022 22:35:38 +0200
Subject: [PATCH] beginTransactionWithAssertingCS() and
 endTransactionWithDeassertingCS()

These two methods are similar to beginTransaction() and endTransaction(),
but, as the name implies, with CS management. They are both public, as
beginTransaction() and endTransaction() are too.
---
 Adafruit_SPIDevice.cpp | 20 ++++++++++++++++++++
 Adafruit_SPIDevice.h   |  2 ++
 2 files changed, 22 insertions(+)

diff --git a/Adafruit_SPIDevice.cpp b/Adafruit_SPIDevice.cpp
index 3cca367..45a2e65 100644
--- a/Adafruit_SPIDevice.cpp
+++ b/Adafruit_SPIDevice.cpp
@@ -282,6 +282,26 @@ void Adafruit_SPIDevice::endTransaction(void) {
   }
 }
 
+/*!
+ *    @brief  Write a buffer or two to the SPI device, with transaction
+ * management.
+ *    @brief  Manually begin a transaction (calls beginTransaction if hardware
+ *            SPI) with asserting the CS pin
+ */
+void Adafruit_SPIDevice::beginTransactionWithAssertingCS() {
+  beginTransaction();
+  setChipSelect(LOW);
+}
+
+/*!
+ *    @brief  Manually end a transaction (calls endTransaction if hardware SPI)
+ *            with deasserting the CS pin
+ */
+void Adafruit_SPIDevice::endTransactionWithDeassertingCS() {
+  setChipSelect(HIGH);
+  endTransaction();
+}
+
 /*!
  *    @brief  Write a buffer or two to the SPI device, with transaction
  * management.
diff --git a/Adafruit_SPIDevice.h b/Adafruit_SPIDevice.h
index 4c8d7bf..7639a9b 100644
--- a/Adafruit_SPIDevice.h
+++ b/Adafruit_SPIDevice.h
@@ -88,6 +88,8 @@ public:
   void transfer(uint8_t *buffer, size_t len);
   void beginTransaction(void);
   void endTransaction(void);
+  void beginTransactionWithAssertingCS();
+  void endTransactionWithDeassertingCS();
 
 private:
   SPIClass *_spi;