From 14d4c6d56c0f999bbd7d8a2331e463192155dc7e Mon Sep 17 00:00:00 2001
From: Sadeep Madurange <sadeep@asciimx.com>
Date: Thu, 1 May 2025 14:27:06 +0800
Subject: Battery check for front end and increase thresh for backend.

---
 lock/bend.c |  2 +-
 lock/fend.c | 27 +++++++++++++++++++++++++++
 2 files changed, 28 insertions(+), 1 deletion(-)

(limited to 'lock')

diff --git a/lock/bend.c b/lock/bend.c
index 2c18996..da8f2e6 100644
--- a/lock/bend.c
+++ b/lock/bend.c
@@ -29,7 +29,7 @@
 #define RX_PCMSK      PCMSK2
 #define RX_PCINTVEC   PCINT2_vect
 
-#define VCC_MIN       4810  /* servo min voltage. */
+#define VCC_MIN       4900
 
 #define LOCK_LED      PC3
 #define UNLOCK_LED    PC4
diff --git a/lock/fend.c b/lock/fend.c
index 7177e72..39854c6 100644
--- a/lock/fend.c
+++ b/lock/fend.c
@@ -23,6 +23,14 @@
 #define RX_PCMSK      PCMSK2
 #define RX_PCINTVEC   PCINT2_vect
 
+#define VCC_MIN       4000
+
+#define LOCK_LED      PC3
+#define UNLOCK_LED    PC4
+#define BATLOW_LED    PC5
+#define LED_DDR       DDRC
+#define LED_PORT      PORTC
+
 static volatile uint8_t rxd = 0;
 static volatile uint8_t sync = 0;
 static volatile uint8_t islock = 0;
@@ -54,8 +62,19 @@ static inline void init_btns(void)
 	EIMSK = (1 << INT0) | (1 << INT1);
 }
 
+static inline void init_leds(void) 
+{
+	LED_DDR |= (1 << LOCK_LED) | (1 << UNLOCK_LED);
+	LED_DDR |= (1 << BATLOW_LED);
+
+	LED_PORT &= ~(1 << LOCK_LED);
+	LED_PORT &= ~(1 << UNLOCK_LED);
+	LED_PORT &= ~(1 << BATLOW_LED);
+}
+
 int main(void)
 {
+	int i;
 	uint8_t rxaddr[ADDRLEN] = { 194, 178, 82 };
 	uint8_t txaddr[ADDRLEN] = { 194, 178, 83 };
 
@@ -63,6 +82,7 @@ int main(void)
 
 	wdt_off();
 	init_rx();
+	init_leds();
 	init_btns();
 
 	uart_init();
@@ -99,6 +119,13 @@ int main(void)
 		}
 
 		if (!sync) {
+			if (getvcc() < VCC_MIN) {
+				for (i = 0; i < 5; i++) {
+					LED_PORT ^= (1 << BATLOW_LED);
+					_delay_ms(100);
+				}
+			}
+
 			radio_pwr_dwn();
 			sleep_enable();	
 			sleep_bod_disable();
-- 
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