From d0ea0a521a582549dfd9a98b47e7c12d8bcd0de6 Mon Sep 17 00:00:00 2001
From: Daniel Friesel <daniel.friesel@uos.de>
Date: Wed, 22 Jul 2020 14:28:32 +0200
Subject: add timed_resistive_load for µs-scale model generation timing
 benchmarks
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---
 .../msp430fr5994lp/driver/timed_resistive_load.h   | 72 ++++++++++++++++++++++
 1 file changed, 72 insertions(+)
 create mode 100644 include/arch/msp430fr5994lp/driver/timed_resistive_load.h

(limited to 'include/arch/msp430fr5994lp/driver')

diff --git a/include/arch/msp430fr5994lp/driver/timed_resistive_load.h b/include/arch/msp430fr5994lp/driver/timed_resistive_load.h
new file mode 100644
index 0000000..6e7996c
--- /dev/null
+++ b/include/arch/msp430fr5994lp/driver/timed_resistive_load.h
@@ -0,0 +1,72 @@
+#ifndef TIMED_RESISTIVE_LOAD_H
+#define TIMED_RESISTIVE_LOAD_H
+
+/*
+ * Resistance at 25°c
+ * R1: 986R
+ * R2: 3K25
+ * R3: 46K3
+ * R4: 9K86
+ */
+
+class TimedResistiveLoad {
+	private:
+		TimedResistiveLoad(const TimedResistiveLoad &copy);
+
+	public:
+		TimedResistiveLoad() {}
+		void setup();
+		void switchToNone();
+		void switchTo750(); // 576R (R1 || R2)
+		void switchTo1K0(); // 986R (R1)
+		void switchTo2K4(); // 2K44 (R2 || 4)
+		void switchTo3K3(); // 3K25 (R2)
+		void switchTo10K(); // 9K86 (R4)
+		void switchTo47K(); // 46K3 (R3)
+
+		/*
+		 * These functions must be inline, as __delay_cycles only works with
+		 * compile-time constants. So they must be part of the compilation unit
+		 * which uses them and cannot easily be wrapped by a function without
+		 * losing accuracy.
+		 */
+
+		inline void __attribute__((always_inline)) nop1K0(unsigned long long int const duration_us)
+		{
+			switchTo1K0();
+			__delay_cycles(F_CPU / 1000000UL * duration_us);
+			switchToNone();
+		}
+
+		inline void __attribute__((always_inline)) nop2K4(unsigned long long int const duration_us)
+		{
+			switchTo2K4();
+			__delay_cycles(F_CPU / 1000000UL * duration_us);
+			switchToNone();
+		}
+
+		inline void __attribute__((always_inline)) nop3K3(unsigned long long int const duration_us)
+		{
+			switchTo3K3();
+			__delay_cycles(F_CPU / 1000000UL * duration_us);
+			switchToNone();
+		}
+
+		inline void __attribute__((always_inline)) nop10K(unsigned long long int const duration_us)
+		{
+			switchTo10K();
+			__delay_cycles(F_CPU / 1000000UL * duration_us);
+			switchToNone();
+		}
+
+		inline void __attribute__((always_inline)) nop47K(unsigned long long int const duration_us)
+		{
+			switchTo47K();
+			__delay_cycles(F_CPU / 1000000UL * duration_us);
+			switchToNone();
+		}
+};
+
+extern TimedResistiveLoad timedResistiveLoad;
+
+#endif
-- 
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