diff --git a/src/dmdreader.cpp b/src/dmdreader.cpp
index d65fe7f..eb2a190 100644
--- a/src/dmdreader.cpp
+++ b/src/dmdreader.cpp
@@ -222,20 +222,20 @@ void spi_abort() {
 }
 
 /**
- * @brief Notify on pin SPI0_CS that data are ready on SPI
+ * @brief Notify on pin SPI_CS that data is ready
  *
  * The SPI master (the Pico is slave) should start a data transfer when this
- * signal is received It toggles pin SPI0_CS to H
+ * signal is received It toggles pin SPI_CS to H
  *
  */
-void start_spi() { digitalWrite(SPI0_CS, HIGH); }
+void start_spi() { digitalWrite(DMDREADER_SPI_CS, HIGH); }
 
 /**
- * @brief Set pin SPI0_CS to L to signal that there is no active SPI data
+ * @brief Set pin _CS to L to signal that there is no active SPI data
  * transfer
  *
  */
-void finish_spi() { digitalWrite(SPI0_CS, LOW); }
+void finish_spi() { digitalWrite(DMDREADER_SPI_CS, LOW); }
 
 /**
  * @brief Cleanly exit SPI by stopping the DMD pio and sending a blank dummy
@@ -1555,8 +1555,8 @@ bool dmdreader_init(bool return_on_no_detection) {
 
 void dmdreader_spi_init() {
   // this is used to notify the Pi that data is available
-  pinMode(SPI0_CS, OUTPUT);
-  digitalWrite(SPI0_CS, LOW);
+  pinMode(DMDREADER_SPI_CS, OUTPUT);
+  digitalWrite(DMDREADER_SPI_CS, LOW);
 
   // Set up SPI header
   h.len = (((target_bytes + 3) / 4) * 4) + sizeof(h) + sizeof(ph);
@@ -1567,9 +1567,9 @@ void dmdreader_spi_init() {
 
   // initialize SPI slave PIO
   dmdreader_error_blink(pio_claim_free_sm_and_add_program_for_gpio_range(
-      &clocked_output_program, &spi_pio, &spi_sm, &spi_offset, SPI_BASE, 4,
-      true));
-  clocked_output_program_init(spi_pio, spi_sm, spi_offset, SPI_BASE);
+      &clocked_output_program, &spi_pio, &spi_sm, &spi_offset,
+      DMDREADER_SPI_BASE, 4, true));
+  clocked_output_program_init(spi_pio, spi_sm, spi_offset, DMDREADER_SPI_BASE);
 
   // DMA for SPI
   spi_dma_channel = dma_claim_unused_channel(true);
diff --git a/src/dmdreader_pins.h b/src/dmdreader_pins.h
index e3daf16..a9c473d 100644
--- a/src/dmdreader_pins.h
+++ b/src/dmdreader_pins.h
@@ -27,11 +27,12 @@
 #endif
 
 // SPI Defines
-#define SPI0 spi0
-#define SPI_BASE 16
-#define SPI0_MISO SPI_BASE        // 16
-#define SPI0_CS (SPI_BASE + 1)    // 17
-#define SPI0_SCK (SPI_BASE + 2)   // 18
-#define SPI0_MOSI (SPI_BASE + 3)  // 19
+#ifndef DMDREADER_SPI_BASE
+#define DMDREADER_SPI_BASE 16  // 16 is the default for backwards compatibility
+#endif
+#define DMDREADER_SPI_MISO SPI_BASE
+#define DMDREADER_SPI_CS 17  // Is locked to 17 for all PPUC/DMD revisions
+#define DMDREADER_SPI_SCK (DMDREADER_SPI_BASE + 2)
+#define DMDREADER_SPI_MOSI (DMDREADER_SPI_BASE + 3)
 
-#endif  // DMD_READER_PINS_H
+#endif  // DMD_READER_PINS_H
\ No newline at end of file