From 33a42edc7f949c2f87e5d50518200b76521ba0af Mon Sep 17 00:00:00 2001
From: true <true_git@truecontrol.org>
Date: Mon, 28 Oct 2024 08:05:03 -0700
Subject: [PATCH] configure unused GPIO, flash lightsense LED during boot for
 testing

---
 nametag8_CH592/user/main.c | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/nametag8_CH592/user/main.c b/nametag8_CH592/user/main.c
index ce25a60..6453744 100644
--- a/nametag8_CH592/user/main.c
+++ b/nametag8_CH592/user/main.c
@@ -146,6 +146,21 @@ void systick_init(void)
     SysTick->CTLR = SysTick_CTLR_STCLK | SysTick_CTLR_STE;  // enable counter in /1 mode
 }
 
+void gpio_init()
+{
+    // by default pins are floating inputs
+
+    // lightsense pins anode (PA5), cathode (PA14) low outputs
+    R32_PA_DIR = (1 << 5) | (1 << 14);
+
+    // configure unused as pullup
+    R8_PA_PU_1 = 0x8f;              // unused PA8-11, PA15
+    R8_PB_PU_2 = 0x80;              // unused PB23
+
+    // disable input buffer on unused pins
+    R32_PIN_CONFIG2 = 0x0200cf00;   // also PA14, only ever an input
+}
+
 
 static void idle_clear()
 {
@@ -372,6 +387,9 @@ int main()
 
     PWR_DCDCCfg(ENABLE);                // enable DC-DC converter; brings significant power saving
 
+    gpio_init();                        // configure default states for GPIO pins
+    R32_PA_OUT |= (1 << 14);            // enable lightsense LED during boot for testing
+
     i2c_init();                         // get i2c initialized since most stuff will need it
 
     uconf_load();                       // read the user config
@@ -399,6 +417,8 @@ int main()
 
     rtcisr_init();                      // configure main program tick interrupt
 
+    R32_PA_CLR = (1 << 14);             // turn off lightsense LED now
+
     lowprio_task();                     // start the low priority task loop
 }