From a18b197ac4c26a6454ed16e4727327f545a45d10 Mon Sep 17 00:00:00 2001
From: jaseg <git@jaseg.net>
Date: Tue, 15 Aug 2017 15:57:33 +0200
Subject: Benchmark code

---
 fw/main.c                            | 14 +++++++-------
 fw/measure_transpose_performance.gdb | 17 +++++++++++++++++
 2 files changed, 24 insertions(+), 7 deletions(-)
 create mode 100644 fw/measure_transpose_performance.gdb

diff --git a/fw/main.c b/fw/main.c
index 2f79954..092028b 100644
--- a/fw/main.c
+++ b/fw/main.c
@@ -245,12 +245,13 @@ int main(void) {
     RCC->CFGR |= (2<<RCC_CFGR_SW_Pos);
     SystemCoreClockUpdate();
 
-    SysTick_Config(SystemCoreClock/1000); /* 1ms interval */
-    NVIC_DisableIRQ(SysTick_IRQn);
+    //SysTick_Config(SystemCoreClock/1000); /* 1ms interval */
+    //NVIC_DisableIRQ(SysTick_IRQn);
+    SysTick->VAL = 0U;
+    SysTick->LOAD = 0x00FFFFFF;
+    SysTick->CTRL = SysTick_CTRL_CLKSOURCE_Msk | SysTick_CTRL_ENABLE_Msk;
     while (42) {
-        static int tick __attribute__((used));
-        static int cvr __attribute__((used));
-        tick = sys_time;
+        static unsigned int cvr __attribute__((used));
         cvr = SysTick->VAL;
         //if (fb_op == FB_FORMAT) {
             transpose_data(rx_buf, write_fb);
@@ -259,8 +260,7 @@ int main(void) {
         //    while (fb_op == FB_UPDATE)
         //        ;
         //}
-        tick = sys_time - tick;
-        cvr = SysTick->VAL - cvr;
+        cvr = cvr -  SysTick->VAL;
         asm volatile ("bkpt");
     }
     //LL_Init1msTick(SystemCoreClock);
diff --git a/fw/measure_transpose_performance.gdb b/fw/measure_transpose_performance.gdb
new file mode 100644
index 0000000..966d69f
--- /dev/null
+++ b/fw/measure_transpose_performance.gdb
@@ -0,0 +1,17 @@
+target remote localhost:3333
+file main.elf
+load
+set print pretty on
+set pagination off
+cont
+print cvr/50.0F
+cont
+print cvr/50.0F
+cont
+print cvr/50.0F
+cont
+print cvr/50.0F
+cont
+print cvr/50.0F
+cont
+quit
-- 
cgit