Add SD card

3 files changed, 30 insertions, 1 deletions

diff --git a/README.md b/README.md
index cc43f96..a086256 100644
--- a/README.md
+++ b/README.md
@@ -1,11 +1,26 @@
 NUCLEO-H743ZI APRS-LoRa Tracker
 ===============================
 
-Connect u-blox NEO-M8N (or other u-blox receiver) to USART-B (RX PD5 and TX PD6) and RFM96 to SPI A and 
+Connect u-blox NEO-M8N (or other u-blox receiver) to USART-B (RX PD5 and TX PD6) and RFM96 to SPI A.
 
 See src/main.ino for definitions.
 
+Pinout
+------
 
+- u-blox NEO module connected to PD5 and PD6
+- RFM96 connected to SPI A:
+  - MISO (Arduino 12), MOSI (Arduino 11), SCK (Arduino 13)
+  - NSS pin:   PD14 (Arduino 10)
+  - DIO0 pin:  PF3 (Arduino 8)
+  - RESET pin: PF15 (Arduino 9)
+
+- SD Card connected to SPI B:
+  - MISO (Arduino 25), MOSI (Arduino 22), SCK (Arduino 23)
+  - CS (Arduino 17)
+
+Build
+-----
 
 This project requires: https://platform.io
 
diff --git a/platformio.ini b/platformio.ini
index c9f1023..a622f22 100644
--- a/platformio.ini
+++ b/platformio.ini
@@ -15,3 +15,4 @@ framework = arduino
 lib_deps = 
 	jgromes/RadioLib@^6.0.0
 	sparkfun/SparkFun u-blox GNSS Arduino Library@^2.2.22
+	arduino-libraries/SD@^1.2.4
diff --git a/src/main.ino b/src/main.ino
index 4bcca3e..da82e01 100644
--- a/src/main.ino
+++ b/src/main.ino
@@ -2,6 +2,11 @@
 #include <RadioLib.h>
 #include <Wire.h>
 #include <SparkFun_u-blox_GNSS_Arduino_Library.h>
+#include <SD.h>
+
+File myFile;
+
+constexpr int SD_CS = 17;
 
 // SX1278 has the following connections:
 // NSS pin:   PD14 (Arduino 10)
@@ -49,6 +54,14 @@ void setup() {
     Serial.begin(9600);
     pinMode(LED_BUILTIN, OUTPUT);
 
+    pinMode(SD_CS, OUTPUT);
+
+    if (!SD.begin(SD_CS)) {
+        Serial.println("SD init failed!");
+        return;
+    }
+
+
     Wire.begin();
 
     SerialGNSS.begin(9600);