Add praline gpio (#3218)

* Implement antenna bias control for Praline and update GPIO configurations
* Add GPIO power management functions and update board initialization for Praline
* Refactor power management functions for Praline and update GPIO configurations
* Update GPIO configurations for Praline and enable power control pins. AA_EN enabled
* Refactor GPIO configuration for Praline: update array size definitions and clean up comments
* Add P1 and P2 control functions for PRALINE
* Introduced P1_Function and P2_Function enums in ClockManager to manage multiplexer control.
* mplemented set_p1_control and set_p2_control methods for configuring P1 and P2 control pins based on specified functions.
* Updated clock_manager.hpp and clock_manager.cpp to include new functionality.
* Modified MAX2837 and MAX2839 initialization to conditionally configure GPIO based on PRALINE.
* Adjusted RFFC507x and RFFC507x_SPI initialization to include GPIO setup for PRALINE.
- Refactored RF path initialization to remove unnecessary GPIO setup.
- Updated board configuration for PRALINE to reflect new GPIO settings and pin configurations.
- Cleaned up FPGA bridge code by removing unused pin configuration functions.
- Adjusted SCU array size in pal_lld.h for PRALINE.
- Enhanced hackrf_gpio.hpp to define multiplexer control pins for PRALINE.
- Modified LED setup to accommodate active-low configuration for PRALINE.

* Refactor GPIO and power control functions

- Removed unused power control function declarations from board.h.
- Enhanced gpio.hpp with new pin setup functions and GPIO control structures for PRALINE.
- Consolidated multiplexer control pin definitions into gpio_control namespace.
- Moved power control function implementations to gpio.cpp, including detailed VAA power management logic.
- Updated power control functions to handle both PRALINE and HackRF R9 configurations.
- Cleaned up hackrf_gpio.hpp by removing redundant multiplexer control definitions.

* Refactor GPIO control for PRALINE: update MAX2831 and RFFC507x configurations, add new GPIO mappings

* Refactor GPIO configurations for PRALINE: update anti-aliasing filter pin mapping, enhance LED setup logic, and add placeholder GPIO entries.

* Refactor GPIO configurations for PRALINE: update LED mappings and remove unused anti-aliasing filter GPIO entry.

firmware/application/hw/max2831.cpp

@@ -103,12 +103,6 @@ void MAX2831::flush_dirty() {
 void MAX2831::init() {
     set_mode(Mode::Shutdown);
 
-    /* Configure GPIO pins for MAX2831 control */
-    gpio_max283x_enable.output();
-    gpio_max2831_rx_enable.output();
-    gpio_max2831_rxhp.output();
-    gpio_max2831_rxhp.write(0); /* RXHP low = 100 Hz HPF (default) */
-
     /* Reset to default register values */
     std::memcpy(_regs.data(), default_regs.data(), sizeof(_regs));
     _regs_dirty = 0xFFFF;
@@ -348,6 +342,16 @@ void MAX2831::set_lpf_rf_bandwidth_rx(const uint32_t bandwidth_minimum) {
 #ifdef PRALINE
     uint32_t actual_bw = bandwidth_minimum;
 
+    /* The MAX2831 internal analog low-pass filter cannot go below 1.75 MHz.
+     * For narrow-band signals (bandwidth < 1.75 MHz), we enable the custom
+     * external Anti-Aliasing (AA) filter on pin P1_14 to prevent aliasing.
+     */
+    if (actual_bw <= 1750000) {
+        gpio_control::aa_en.set();  // Enable external narrow AA filter
+    } else {
+        gpio_control::aa_en.clear();  // Disable external AA filter for wideband operations
+    }
+
     _desired_lpf_bw = actual_bw;
     if (_mode == Mode::Receive || _mode == Mode::Rx_Calibration) {
         set_lpf_bandwidth_internal(actual_bw);
@@ -361,6 +365,9 @@ void MAX2831::set_lpf_rf_bandwidth_rx(const uint32_t bandwidth_minimum) {
 
 void MAX2831::set_lpf_rf_bandwidth_tx(const uint32_t bandwidth_minimum) {
     _desired_lpf_bw = bandwidth_minimum;
+#ifdef PRALINE
+    gpio_control::aa_en.clear();  // Disable external AA filter for wideband operations
+#endif
     if (_mode == Mode::Transmit || _mode == Mode::Tx_Calibration) {
         set_lpf_bandwidth_internal(bandwidth_minimum);
     }