diff --git a/drivers/aps6404/aps6404.cpp b/drivers/aps6404/aps6404.cpp
index dce1be1c..c935452d 100644
--- a/drivers/aps6404/aps6404.cpp
+++ b/drivers/aps6404/aps6404.cpp
@@ -48,14 +48,11 @@ namespace pimoroni {
             gpio_disable_pulls(pin_d0 + i);
         }
 
-        pio_sm = 1;
-        pio_sm_claim(pio, pio_sm);
+        pio_sm = pio_claim_unused_sm(pio, true);
 
         // Claim DMA channels
-        dma_channel = 0;
-        dma_channel_claim(dma_channel);
-        read_cmd_dma_channel = 1;
-        dma_channel_claim(read_cmd_dma_channel);
+        dma_channel = dma_claim_unused_channel(true);
+        read_cmd_dma_channel = dma_claim_unused_channel(true);
     }
 
     void APS6404::init() {
diff --git a/drivers/dv_display/dv_display.cpp b/drivers/dv_display/dv_display.cpp
index 512197c3..8ba85d7d 100644
--- a/drivers/dv_display/dv_display.cpp
+++ b/drivers/dv_display/dv_display.cpp
@@ -15,7 +15,11 @@ extern "C" {
 
 namespace pimoroni {
 
-  void DVDisplay::init() {
+  void DVDisplay::init(uint16_t width, uint16_t height, Mode mode) {
+    this->width = width;
+    this->height = height;
+    this->mode = mode;
+
     uint8_t res_mode = 0xFF;
     uint16_t full_width = width;
     uint16_t full_height = height;
diff --git a/drivers/dv_display/dv_display.hpp b/drivers/dv_display/dv_display.hpp
index 7140ea3a..c5bab8e1 100644
--- a/drivers/dv_display/dv_display.hpp
+++ b/drivers/dv_display/dv_display.hpp
@@ -72,19 +72,15 @@ namespace pimoroni {
     //   800x600 (60Hz), 800x480 (60Hz), 800x450 (60Hz), 960x540 (50Hz), 1280x720 (30Hz)
     // Note resolutions on the second line require quite extreme overclocking and may not work on all hardware.
     // Either or both of the horizontal or vertical component of any resolution may be halved.
-    DVDisplay(uint16_t width, uint16_t height, Mode mode = MODE_RGB555)
+    DVDisplay()
       : ram(CS, D0, pio1)
       , i2c(new I2C(I2C_SDA, I2C_SCL))
-      , width(width), height(height)
-      , mode(mode)
       , pixel_buffer_location(-1, -1)
     {}
 
-    DVDisplay(uint16_t width, uint16_t height, I2C* i2c, Mode mode = MODE_RGB555)
+    DVDisplay(I2C* i2c)
       : ram(CS, D0, pio1)
       , i2c(i2c)
-      , width(width), height(height)
-      , mode(mode)
       , pixel_buffer_location(-1, -1)
     {}
 
@@ -131,7 +127,7 @@ namespace pimoroni {
       void write_pixel(const Point &p, RGB888 colour) override;
       void write_pixel_span(const Point &p, uint l, RGB888 colour) override;
 
-      void init();
+      void init(uint16_t width, uint16_t height, Mode mode = MODE_RGB555);
       void flip();
 
       // 32 colour palette mode.  Note that palette entries range from 0-31,
diff --git a/drivers/dv_display/swd_load.cpp b/drivers/dv_display/swd_load.cpp
index 87040a9e..df180b65 100644
--- a/drivers/dv_display/swd_load.cpp
+++ b/drivers/dv_display/swd_load.cpp
@@ -102,7 +102,7 @@ static bool connect(bool first = true, uint core = 0) {
     if (first) {
         pio_prog = &swd_raw_write_program;
         pio_offset = pio_change_exclusive_program(swd_pio, &swd_raw_write_program);
-        pio_sm = 0;
+        pio_sm = pio_claim_unused_sm(swd_pio, true);
 
         swd_initial_init(swd_pio, pio_sm, 2, 3);