From 7d85aa1c0fdd9fb0f4ed8397b2b8b9708250d04c Mon Sep 17 00:00:00 2001
From: key <key@devbian.home>
Date: Wed, 22 Dec 2021 16:31:04 +0100
Subject: [PATCH] Timer added the timerSetHz()

---
 bsl/csl/interfaces/timer.h    |  4 ----
 bsl/csl/stm32f042/Src/timer.c | 30 ++++++++++++++++++++----------
 main.cpp                      |  8 +++-----
 3 files changed, 23 insertions(+), 19 deletions(-)

diff --git a/bsl/csl/interfaces/timer.h b/bsl/csl/interfaces/timer.h
index 76d4482..8fe1733 100644
--- a/bsl/csl/interfaces/timer.h
+++ b/bsl/csl/interfaces/timer.h
@@ -45,10 +45,6 @@ void timerReset(timerNo_t timer);
 void timerActivateBus(timerNo_t timer); 
 void timerEnableTimer(timerNo_t timer); 
 void timerDisableTimer(timerNo_t timer);
-// -> clock source is set by the clock tree and cant be individually set. This should be done
-// in the clock domain and nt here in the timerdomain. For reference one can look at the nucleo
-// stm32f042k6 clock tree diagramm in reference Manual
-//void timerSetClkSource(timerNo_t timer, clkSources_t clk); 
 void timerSetMode(timerNo_t timer, timerMode_t mode); 
 void timerSetCountDirection(timerNo_t timer, timerCountDirection_t direction); 
 void timerSetPrescaler(timerNo_t timer, uint32_t prescaler); 
diff --git a/bsl/csl/stm32f042/Src/timer.c b/bsl/csl/stm32f042/Src/timer.c
index c7c8f3f..832bba7 100644
--- a/bsl/csl/stm32f042/Src/timer.c
+++ b/bsl/csl/stm32f042/Src/timer.c
@@ -30,10 +30,6 @@ void timerDisableTimer(timerNo_t timer)
 	BASE->CR1 &=~ 0x01; //all the timers have the same CEN bit in CR1 register pos 0	
 }
  
-void timerSetClkSource(timerNo_t timer, clkSources_t clk)
-{
-	
-}
  
 void timerSetMode(timerNo_t timer, timerMode_t mode)
 {
@@ -82,18 +78,32 @@ void timerClearUpdateInterrupt(timerNo_t timer)
 }	
 
 /* Second stage configuration */
+
+
+/*			Bus Clock
+ * ------------------------------ = Duty (Hz)
+ *  (Prescaler-1) * (Period-1)
+ */
 void timerSetHz(timerNo_t timer, uint16_t hz)
 {
-	uint32_t prescaler;
-	uint32_t period;
+	uint32_t prescaler = 8000000;
+	uint32_t period = 0;
+	uint32_t temp = 0; 	
+	
+	do{
+		prescaler = prescaler / 10; 
+	}while(prescaler > 0xffff);
+	
 	
-		
+	do{
+		period = period + 1; 
+		temp = 8000000/(prescaler*(period)); 
+	}while(temp >= hz);
 
 	timerActivateBus(timer);
-	timerSetPrescaler(timer, 1599);
-	timerSetAutoReload(timer, 9999);
+	timerSetPrescaler(timer, prescaler-1);
+	timerSetAutoReload(timer, period-1);
 	timerClearCounter(timer);
-	timerEnableTimer(timer);
 }
  
 void timerSetMs(timerNo_t timer, uint16_t ms)
diff --git a/main.cpp b/main.cpp
index 1888357..6d3e3f8 100644
--- a/main.cpp
+++ b/main.cpp
@@ -15,12 +15,10 @@ int main(int argc, char *argv[])
 
 	delayInitMs(8000000, 1000); 
 	
-	timerActivateBus(timer_2);
-	timerSetPrescaler(timer_2, 8000-1);
-	timerSetAutoReload(timer_2, 1000-1);
-	timerClearCounter(timer_2);
-	timerEnableTimer(timer_2);
 
+	timerSetHz(timer_2,10);
+	timerEnableTimer(timer_2);
+	
 	pinConfig(pinB3, output, pushPull, def_res, def_speed);
 	pinConfig(pinA0, input, def_stage, pullDown, def_speed);