bluetooth command mode working

projects/bridge_controller/l4_io/Bluetooth/bluetooth.c

+#include "bluetooth.h"
+#include "gpio.h"
+#include "uart.h"
+#include <stdio.h>
+#include <string.h>
+
+static const uart_e bt_module_uart_port = UART__3;
+
+/**
+ * Need room for NULL terminator which the module does
+ * not send over UART. Therefore, we have to put it
+ * ourself.
+ */
+static const int max_received_data_in_bytes = 255;
+
+/************************* */
+/*     TYPEDEFS/ENUMS      */
+/************************* */
+typedef enum { bt_data_mode, bt_command_mode } bt_mode_e;
+
+/***************************** */
+/*      STATIC FUNCTIONS       */
+/***************************** */
+static void send_command_terminating_characters(void) {
+  uart__put(bt_module_uart_port, '\r', portMAX_DELAY);
+  uart__put(bt_module_uart_port, '\n', portMAX_DELAY);
+}
+
+static void bt_set_mode(bt_mode_e mode) {
+  if (mode == bt_command_mode) {
+    gpio__set(bt_pin__mod);
+  } else {
+    gpio__reset(bt_pin__mod);
+  }
+}
+
+static bool bt_setup_commands(void) {
+  /**
+   * use bt_module__send_command() to perform necessary
+   * setup commands such as beacon setup, GAP config, etc.
+   */
+  bool command_send_failure = false;
+  /** Send commands here */
+  return command_send_failure;
+}
+
+/***************************** */
+/*      PUBLIC FUNCTIONS       */
+/***************************** */
+
+/**
+ * Set up GPIO pins
+ *  - CTS, RTS (optional)
+ * Init UART at 9600 bps to match BT module
+ *
+ * NOTE: If it turns out we need to toggle between UART
+ * and CMD mode, we need to initially set it to CMD mode
+ */
+void bt_module__init(void) {
+  gpio__construct_with_function(GPIO__PORT_4, 28, GPIO__FUNCTION_2);
+  gpio__construct_with_function(GPIO__PORT_4, 29, GPIO__FUNCTION_2);
+  uart__init(bt_module_uart_port, clock__get_peripheral_clock_hz(), 9600);
+
+  QueueHandle_t rxq = xQueueCreate(255, sizeof(char));
+  QueueHandle_t txq = xQueueCreate(128, sizeof(char));
+  uart__enable_queues(bt_module_uart_port, txq, rxq);
+
+  bt_pin__mod = gpio__construct_as_output(GPIO__PORT_0, 15);
+  bt_pin__cts = gpio__construct_as_output(GPIO__PORT_0, 18);
+  bt_pin__rts = gpio__construct_as_input(GPIO__PORT_2, 9);
+  gpio__reset(bt_pin__cts);
+  bt_set_mode(bt_command_mode);
+  /**
+   * Eventually need to configure beaconing
+   */
+  // bt_setup_commands();
+}
+
+void bt_module__send_command(char *cmd_string) {
+  bt_set_mode(bt_command_mode);
+  for (int i = 0; i < strlen(cmd_string); i++) {
+    uart__put(bt_module_uart_port, cmd_string[i], portMAX_DELAY);
+  }
+  send_command_terminating_characters();
+  // bt_set_mode(bt_data_mode);
+}
+
+bool bt_module__recv_data(char *recv_data_ptr) {
+  bool transmission_successful;
+  int i = 0;
+  while (i < max_received_data_in_bytes) {
+    char incoming_byte = '\0';
+
+    if (uart__get(bt_module_uart_port, &incoming_byte, 1000)) {
+      recv_data_ptr[i++] = incoming_byte;
+      if (incoming_byte == '\r' || incoming_byte == '\n') {
+        recv_data_ptr[i] = '\0';
+        transmission_successful = true;
+        break;
+      }
+    } else {
+      transmission_successful = false;
+    }
+  }
+  return transmission_successful;
+}

projects/bridge_controller/l4_io/Bluetooth/bluetooth.h

+#pragma once
+#include "gpio.h"
+#include <stdbool.h>
+
+/**
+ * Set up GPIO pins
+ *  - TX, RX, CTS, RTS (optional)
+ * Init UART at 9600 bps to match BT module
+ */
+gpio_s bt_pin__cts;
+gpio_s bt_pin__rts;
+gpio_s bt_pin__mod;
+
+void bt_module__init(void);
+
+void bt_module__send_command(char *cmd_string);
+
+bool bt_module__recv_data(char *recv_data_ptr);