From d2e9a8dc064f8e54df64a7ff6c469dbacf0713dd Mon Sep 17 00:00:00 2001
From: Bernd Herzog <bernd@nachregenkommtsonne.de>
Date: Tue, 14 Nov 2023 12:22:26 +0100
Subject: [PATCH] Hackrf mode when no pp attached (#1580)

* added portapack presence detection

* adjusted timeout

* fixed ak4951 initialisation
---
 firmware/application/main.cpp      |  2 ++
 firmware/application/portapack.cpp | 14 ++++++++++++++
 2 files changed, 16 insertions(+)

diff --git a/firmware/application/main.cpp b/firmware/application/main.cpp
index eaad76cb3..28d9fd21f 100755
--- a/firmware/application/main.cpp
+++ b/firmware/application/main.cpp
@@ -186,6 +186,8 @@ int main(void) {
         sdcStop(&SDCD1);
 
         portapack::shutdown();
+    } else {
+        config_mode_clear();
     }
 
     m4_init(portapack::spi_flash::image_tag_hackrf, portapack::memory::map::m4_code_hackrf, true);
diff --git a/firmware/application/portapack.cpp b/firmware/application/portapack.cpp
index 86c4c4863..f9033a3d7 100644
--- a/firmware/application/portapack.cpp
+++ b/firmware/application/portapack.cpp
@@ -467,6 +467,20 @@ bool init() {
     i2c0.start(i2c_config_fast_clock);
     chThdSleepMilliseconds(10);
 
+    /* Check if portapack is attached by checking if any of the two audio chips is present. */
+    systime_t timeout = 50;
+    uint8_t wm8731_reset_command[] = {0x0f, 0x00};
+    if (i2c0.transmit(0x1a /* wm8731 */, wm8731_reset_command, 2, timeout) == false) {
+        audio_codec_ak4951.reset();
+        uint8_t ak4951_init_command[] = {0x00, 0x00};
+        i2c0.transmit(0x12 /* ak4951 */, ak4951_init_command, 2, timeout);
+        chThdSleepMilliseconds(10);
+        if (i2c0.transmit(0x12 /* ak4951 */, ak4951_init_command, 2, timeout) == false) {
+            shutdown_base();
+            return false;
+        }
+    }
+
     touch::adc::init();
     controls_init();
     chThdSleepMilliseconds(10);