From d4db9babdf4bd654dcfe35e6421b2e07abbea56b Mon Sep 17 00:00:00 2001
From: Adema <h.adema@rug.nl>
Date: Mon, 12 May 2025 07:08:03 +0200
Subject: [PATCH] Upload files to "spi_receive"

---
 spi_receive/spi_receive.ino | 37 +++++++++++++++++++++++++++++++++++++
 1 file changed, 37 insertions(+)
 create mode 100644 spi_receive/spi_receive.ino

diff --git a/spi_receive/spi_receive.ino b/spi_receive/spi_receive.ino
new file mode 100644
index 0000000..06a7303
--- /dev/null
+++ b/spi_receive/spi_receive.ino
@@ -0,0 +1,37 @@
+uint32_t spiRx[256]; // Array to store received data
+volatile int spiRxIdx = 0;  // Index to track how many items are in spiRx
+volatile int spiRxComplete = 0;  // Flag to indicate when data is ready for printing
+
+char buffer[2048]; // Character buffer to store formatted data
+int indexbuf = 0; // Track current position in buffer
+
+#include "SPISlave_T4.h"
+SPISlave_T4<&SPI, SPI_8_BITS> mySPI;
+
+IntervalTimer SPI_transfer;
+
+void setup() {
+  Serial.begin(921600);
+  mySPI.begin();
+  mySPI.swapPins(true);
+  SPI_transfer.begin(ReceiveData, 10);  // run every 10000 microseconds
+}
+
+void loop() {
+  // Other loop code can go here (if necessary)
+}
+
+void ReceiveData() {
+  if (spiRxComplete) {
+    indexbuf = 0;
+    for (int i = 0; i < spiRxIdx; i++) {
+       indexbuf += snprintf(buffer + indexbuf, sizeof(buffer) - indexbuf, "%02X ", (unsigned int)spiRx[i]);
+    }    
+    // Print the formatted buffer at once
+    Serial.println(buffer);
+    
+    // Reset for the next round of data
+    spiRxComplete = 0;
+    spiRxIdx = 0;
+  }
+}