Start implementing GPS decoder.

Makefile

@@ -29,6 +29,9 @@ USEMODULE += loramac-mac
 USEMODULE += loramac-region
 USEMODULE += loramac-crypto
 
+# Application dependencies.
+USEMODULE += periph_uart
+
 
 # Source directory is "src".
 DIRS += src

README.md

 # Benchmark with IM880B / RIOT OS
 
 https://drive.google.com/drive/folders/1O97FAvNMbrU97v5Ol_Z1yQX8Y1GhPaNc?usp=sharing
+
+
+## Cloning this repository
+
+```sh
+git clone --recurse-submodules git@gitlab.ensimag.fr:lorawan-bm/riot-im880b.git
+cd riot-im880b
+chmod u+x ./apply-patches.sh
+./apply-patches.sh
+```
+
+
+## Architecture of the application
+
+```sh
+▶ RIOT  # Submodule containing RIOT OS
+
+▶ patches  # Patches to apply on RIOT sources
+
+▶ src
+├── app  # Application sources
+├── loramac  # LoRaMAC-node sources
+└── lorariot  # RIOT adapter for LoRaMAC-node
+```

apply-patches.sh

+#!/bin/bash
+#
+# Apply Git patches on RIOT repository.
+# 
+# Copyright (C) 2019, ENSIMAG students
+# This project is under the MIT license
+
+cd "$(dirname "$0")"
+
+for patch in ./patches/*.patch; do
+    git apply "$patch"
+done

src/Makefile

 #
-# LoRaMAC-node MAC module.
+# Main sources module.
 # 
 # Copyright (C) 2019, ENSIMAG students
 # This project is under the MIT license

src/app/activation.c

+/*
+
+Manage device activation via OTAA or ABP.
+
+Copyright (C) 2019, ENSIMAG students
+This project is under the MIT license
+
+*/
\ No newline at end of file

src/app/app.h

+
+
+
+typedef struct {
+    mutex_t mutex;
+    bool is_parsing;
+} gps_isr_info_t;
+
+extern gps_isr_info_t gps_isr_info;

src/app/gps.c

+/*
+
+Decode GPS data.
+
+Copyright (C) 2019, ENSIMAG students
+This project is under the MIT license
+
+*/
+
+
+gps_isr_info_t gps_isr_info = { MUTEX_INIT };
+
+
+uint8_t gps_parse_data()
+{
+    
+}

src/app/gps-stdio.c → src/app/uart.c

 /*
 
-Implement stdio and fetch GPS data.
+Manage UART: implement stdio and fetch GPS data.
 
 Copyright (C) 2019, ENSIMAG students
 This project is under the MIT license
@@ -8,39 +8,54 @@ This project is under the MIT license
 */
 
 #include <mutex.h>
+#include <periph/uart.h>
 
 #include <stdio.h>
+#include <stdbool.h>
 
 
-typedef struct {
-    mutex_t mutex = MUTEX_INIT;
-} gps_isr_info_t;
+// UART configuration.
+#define STD_DEV      UART_DEV(0)
+#define STD_BAUDRATE 9600
 
-static gps_isr_info_t gps_isr_info;
+
+//
 
 
 // Handle 
 static void gps_isr(gps_isr_info_t *info, char c)
 {
-    mutex_unlock(&info->mutex);
+    if (info->is_parsing)
+        return; // Ignore new GPS data while parsing an old one.
+
+    if ((c == '$') || (c->line_length >= 127))
+        c->line_length = 0;
+
+    c->line[c->line_length++] = c;
+    if (c == '\n') {
+        c->line[c->line_length++] = '\0';
+        mutex_unlock(&info->mutex);
+    }
 }
 
 
+
 // STDIN is disabled in our application.
 ssize_t stdio_read(void *buffer, size_t count)
 {
+    (void)buffer;  (void)count;
     return 0;
 }
 
 // Write STDOUT data to serial port 0.
 ssize_t stdio_write(const void *buffer, size_t len)
 {
-    uart_write(STDIO_UART_DEV, (const uint8_t *)buffer, len);
+    uart_write(STD_DEV, (const uint8_t *)buffer, len);
     return len;
 }
 
 // Initialize STDIO module.
 void stdio_init(void)
 {
-    uart_init(STDIO_UART_DEV, STDIO_UART_BAUDRATE, (uart_rx_cb_t)gps_isr, &gps_isr_info);
+    uart_init(STD_DEV, STD_BAUDRATE, (uart_rx_cb_t)gps_isr, &gps_isr_info);
 }