diff --git a/firmware/lux.cpp b/firmware/lux.cpp
index dfa771f..d5d8e3c 100644
--- a/firmware/lux.cpp
+++ b/firmware/lux.cpp
@@ -14,7 +14,6 @@
 extern "C" {
 #include <sysparam.h>
 }
-const int cs0 = 15;
 
 struct apa10xx_pixel_t {
     struct {
@@ -70,6 +69,7 @@ namespace fiatlux {
         hal_module_t gpio2 = hal_module_t::NONE;
         hal_module_t gpio4 = hal_module_t::NONE;
         hal_module_t gpio5 = hal_module_t::NONE;
+        hal_module_t gpio15 = hal_module_t::NONE;
     }
 
     namespace signal {
@@ -99,41 +99,43 @@ namespace fiatlux {
     }
 
     namespace spi_dimmer {
+        constexpr int cs0 = 15;
+
         void write_data(uint16_t data[6]) {
             for (int i = 0; i < 6; ++i) {
                 int dac_val = (data[i] << 2) & 0x3FFC;
 
                 spi_transfer_8(1, ~(0x00));
-                gpio_write(cs0, 1);
-                gpio_write(cs0, 0);
+                gpio_write(cs0, true);
+                gpio_write(cs0, false);
                 spi_transfer_8(1, ~(0x01 << i));
-                gpio_write(cs0, 1);
-                gpio_write(cs0, 0);
+                gpio_write(cs0, true);
+                gpio_write(cs0, false);
 
                 spi_transfer_16(1, dac_val);
 
                 spi_transfer_8(1, ~(0x00));
-                gpio_write(cs0, 1);
-                gpio_write(cs0, 0);
+                gpio_write(cs0, true);
+                gpio_write(cs0, false);
                 spi_transfer_8(1, ~(0x01 << i));
-                gpio_write(cs0, 1);
-                gpio_write(cs0, 0);
+                gpio_write(cs0, true);
+                gpio_write(cs0, false);
             }
         }
 
         void setup() {
+            gpio_enable(cs0, GPIO_OUTPUT);
             spi_init(1, SPI_MODE0, SPI_FREQ_DIV_1M, 1, SPI_BIG_ENDIAN, 1);
         }
     }
 
     namespace ws28x {
-        void write_data(ws2812_pixel_t *data, size_t len) {
-            ws2812_i2s_init(len, PIXEL_RGBW);
+        void write_data(ws2812_pixel_t *data) {
             ws2812_i2s_update(data, PIXEL_RGBW);
         }
 
-        void setup() {
-
+        void setup(size_t len) {
+            ws2812_i2s_init(len, PIXEL_RGBW);
         }
     }
 
@@ -142,6 +144,8 @@ namespace fiatlux {
             spi_transfer_32(1, 0x00000000);
             for (size_t i = 0; i < len; i++)
                 spi_transfer_32(1, *(uint32_t *) &data[i]);
+            //spi_transfer_32(1, *(uint32_t *) &data[len - 1]); // dunno maybe this helps
+            //spi_transfer_32(1, *(uint32_t *) &data[len - 1]); // dunno maybe this helps
             spi_transfer_32(1, 0xFFFFFFFF);
             spi_transfer_32(1, 0xFFFFFFFF);
         }
@@ -173,7 +177,7 @@ namespace fiatlux {
         } else if(mod == hal_module_t::WS28X) {
             if(stride != 4)
                 return "unsupported value for stride";
-            ws28x::write_data((ws2812_pixel_t *) data, count);
+            ws28x::write_data((ws2812_pixel_t *) data);
         } else if(mod == hal_module_t::APA10X) {
             if(stride != 4)
                 return "unsupported value for stride";
@@ -236,10 +240,10 @@ extern "C" [[noreturn]] void lux_task(void *pvParameters) {
     if(ret != SYSPARAM_OK)
         lux_ws2812_number = 8;
 
-    int32_t lux_apa10xx_number = 8;
+    int32_t lux_apa10xx_number = 40;
     ret = sysparam_get_int32("lux_apa10xx_number", &lux_apa10xx_number);
     if(ret != SYSPARAM_OK)
-        lux_apa10xx_number = 8;
+        lux_apa10xx_number = 40;
 
     ws2812_pixel_t pixels[lux_ws2812_number];
     ws2812_i2s_init(lux_ws2812_number, PIXEL_RGBW);
@@ -252,7 +256,6 @@ extern "C" [[noreturn]] void lux_task(void *pvParameters) {
     //gpio_enable(9, GPIO_INPUT);
     //gpio_enable(10, GPIO_INPUT);
 
-    //gpio_enable(cs0, GPIO_OUTPUT);
     //fiatlux::spi_dimmer::setup();
 
     fiatlux::signal::setup();