From 0d502cd0995600b1399c442697bfba5af4ae9deb Mon Sep 17 00:00:00 2001
From: Daniel Friesel <derf@finalrewind.org>
Date: Sun, 16 Jan 2022 18:38:21 +0100
Subject: msp430fr timer: automatically set TA0CCR for low Hz values

---
 include/arch/msp430fr5969lp/driver/timer.h | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

(limited to 'include/arch/msp430fr5969lp')

diff --git a/include/arch/msp430fr5969lp/driver/timer.h b/include/arch/msp430fr5969lp/driver/timer.h
index c07ae4e..160074a 100644
--- a/include/arch/msp430fr5969lp/driver/timer.h
+++ b/include/arch/msp430fr5969lp/driver/timer.h
@@ -58,8 +58,15 @@ class Timer {
 
 		inline void setup_hz(uint16_t const frequency) { // 2 MHz base
 			TA0CTL = TASSEL__SMCLK | _TA0_MAIN_DIV;
-			TA0EX0 = 0;
-			TA0CCR0 = 2000000UL / frequency;
+			if (frequency < 32) {
+				// 2 MHz base
+				TA0EX0 = 7;
+				TA0CCR0 = 250000UL / frequency;
+			} else {
+				// 250 kHz base
+				TA0EX0 = 0;
+				TA0CCR0 = 2000000UL / frequency;
+			}
 			TA0CTL |= TACLR;
 		}
 #endif
-- 
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