From 94cdc9ec4e75fc5e55deb394eda4820ba672e3e4 Mon Sep 17 00:00:00 2001
From: Sam Anthony <sam@samanthony.xyz>
Date: Thu, 23 Oct 2025 19:44:16 -0400
Subject: enable CLKOUT

---
 fw/can.c                         | 7 +++++--
 fw/system.c                      | 2 +-
 fw/tests/system/can_tx_systest.c | 2 +-
 3 files changed, 7 insertions(+), 4 deletions(-)

(limited to 'fw')

diff --git a/fw/can.c b/fw/can.c
index 2998631..6518f91 100644
--- a/fw/can.c
+++ b/fw/can.c
@@ -12,6 +12,8 @@
 // Oscillator startup timeout
 #define STARTUP_TIME 128u
 
+#define TX_RETRIES 10u
+
 // Register addresses
 typedef enum {
 	// Config and status
@@ -288,6 +290,7 @@ canTx(const CanFrame *frame) {
 
 	// Send
 	bitModify(REG_TXB0CTRL, TXREQ, TXREQ);
+	k = 0u;
 	do {
 		ctrl = read(REG_TXB0CTRL);
 		if (ctrl & TXERR) {
@@ -295,9 +298,9 @@ canTx(const CanFrame *frame) {
 			bitModify(REG_TXB0CTRL, TXREQ, 0); // cancel  transmission
 			return FAIL;
 		}
-	} while (ctrl & TXREQ); // transmission in progress
+	} while ((ctrl & TXREQ) && (++k <= TX_RETRIES)); // transmission in progress
 
-	return OK;
+	return (k <= TX_RETRIES) ? OK : FAIL;
 }
 
 void
diff --git a/fw/system.c b/fw/system.c
index 720f456..5f7bbb4 100644
--- a/fw/system.c
+++ b/fw/system.c
@@ -9,7 +9,7 @@
 #pragma config MCLRE = ON // MCLR Pin Function Select (MCLR pin is MCLR)
 #pragma config CP = OFF // Flash Program Memory Code Protection (Program memory code protection is disabled)
 #pragma config BOREN = ON // Brown-out Reset Enable (Brown-out Reset enabled)
-#pragma config CLKOUTEN = OFF // Clock Out Enable (CLKOUT function is disabled. I/O or oscillator function on the CLKOUT pin)
+#pragma config CLKOUTEN = ON // Clock Out Enable (CLKOUT function is disabled. I/O or oscillator function on the CLKOUT pin)
 #pragma config IESO = OFF // Internal/External Switchover Mode (Internal/External Switchover Mode is disabled)
 #pragma config FCMEN = OFF // Fail-Safe Clock Monitor Enable (Fail-Safe Clock Monitor is disabled)
 
diff --git a/fw/tests/system/can_tx_systest.c b/fw/tests/system/can_tx_systest.c
index a770d06..b1dec17 100644
--- a/fw/tests/system/can_tx_systest.c
+++ b/fw/tests/system/can_tx_systest.c
@@ -49,7 +49,7 @@ main(void) {
 void
 __interrupt() isr(void) {
 	if (PIR1bits.TMR1IF) {
-		if (++ctr == 23u) { // 1s period
+		if (++ctr == 114u) { // 5s period
 			(void)canTx(&frame);
 			ctr = 0u;
 		}
-- 
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