From 172c903f0925956fc93281a7e3a50ba4d80b0eb5 Mon Sep 17 00:00:00 2001
From: Scott Penrose <scottp@dd.com.au>
Date: Tue, 16 Jun 2026 13:25:45 +1000
Subject: [PATCH] Valid SD pins for T3S3

---
 platformio.ini | 9 +++++----
 src/main.cpp   | 4 ++--
 2 files changed, 7 insertions(+), 6 deletions(-)

diff --git a/platformio.ini b/platformio.ini
index e064fb4..f94dbe9 100644
--- a/platformio.ini
+++ b/platformio.ini
@@ -87,11 +87,12 @@ build_flags =
     -DGPIO_RESET_PIN=2                 ; CONFIRM: -> sensor RST
     -DGPIO_WAKE_PIN=1                  ; CONFIRM: -> sensor control/wake pin
     -DGPIO_CTRL_ACTIVE_LOW=1
-    ; --- microSD (CONFIRM: may share the LoRa SPI bus + own CS) ---
-    -DT3S3_SD_SCK=5
-    -DT3S3_SD_MISO=3
-    -DT3S3_SD_MOSI=6
+    ; --- microSD on FSPI/SPI2 (separate bus from LoRa, which uses HSPI/SPI3) ---
+    -DT3S3_SD_SCK=14
+    -DT3S3_SD_MISO=2
+    -DT3S3_SD_MOSI=11
     -DT3S3_SD_CS=13
+    -DT3S3_SD_FREQ_HZ=20000000UL
     ; --- timezone for NTP-dated logs (Australia/Victoria) ---
     -DNTP_TZ='"AEST-10AEDT,M10.1.0,M4.1.0/3"'
 lib_deps =
diff --git a/src/main.cpp b/src/main.cpp
index aeb58c1..ea8a7e3 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -129,7 +129,7 @@ bool sdAvailable = false;
 bool logEnabled  = true;          // ON by default once we have a date
 bool ntpSynced   = false;
 #if BOARD_T3S3
-SPIClass sdSPI(HSPI);
+SPIClass sdSPI(FSPI);
 File logFile;
 bool   logAtLineStart = true;
 char   logPath[40] = {0};
@@ -565,7 +565,7 @@ void setupWiFi() {
 #if BOARD_T3S3
 void setupSD() {
     sdSPI.begin(T3S3_SD_SCK, T3S3_SD_MISO, T3S3_SD_MOSI, T3S3_SD_CS);
-    sdAvailable = SD.begin(T3S3_SD_CS, sdSPI);
+    sdAvailable = SD.begin(T3S3_SD_CS, sdSPI, T3S3_SD_FREQ_HZ);
     Serial.printf("[SD] %s (CS=%d)\n", sdAvailable ? "mounted" : "NOT found -- check T3S3_SD_* pins",
                   T3S3_SD_CS);
 }