diff --git a/firmware/retro_tech_fw/user/ch32v00x_it.c b/firmware/retro_tech_fw/user/ch32v00x_it.c
index 00614d5..030fc14 100644
--- a/firmware/retro_tech_fw/user/ch32v00x_it.c
+++ b/firmware/retro_tech_fw/user/ch32v00x_it.c
@@ -53,26 +53,24 @@ volatile uint32_t uptime;
 
 void SysTick_Handler(void)
 {
-    if (++ticnt > 0x7ff) {
+    if (++ticnt > 0x1ff) {
         ticnt = 0;
         uptime++;
     }
 
     // send new LEDs (1/128 duty)
-    if ((ticnt & 0xf) == 3) {
+    if ((ticnt & 0x3) == 0) {
         led_send();
     }
 
     // process buttons (1/512 duty)
-    if ((ticnt & 0x3) == 0) {
-        btn_poll();
-    }
+    btn_poll();
 
     // process ADC (1/256 duty)
-    if ((ticnt & 0x07) == 1) {
+    if ((ticnt & 0x1) == 0) {
         adc_convert();
     }
-    if ((ticnt & 0x07) == 2) {
+    if ((ticnt & 0x1) == 1) {
         adc_read();
     }
 
diff --git a/firmware/retro_tech_fw/user/main.c b/firmware/retro_tech_fw/user/main.c
index 7a2175a..e58752c 100644
--- a/firmware/retro_tech_fw/user/main.c
+++ b/firmware/retro_tech_fw/user/main.c
@@ -30,7 +30,7 @@
 
 void systick_init(void)
 {
-    SysTick->CMP = (SystemCoreClock / 2048) - 1;    // we want a 2048Hz interrupt
+    SysTick->CMP = (SystemCoreClock / 512) - 1;     // we want a 512Hz interrupt
     SysTick->CNT = 0;                               // clear counter
     SysTick->CTLR = 0xF;                            // start counter in /1 mode, enable interrupts, auto-reset counter
     SysTick->SR = 0;                                // clear count comparison flag
@@ -82,13 +82,6 @@ void gpio_init()
     GPIO_Init(GPIOC, &gpio);
 }
 
-/*********************************************************************
- * @fn      main
- *
- * @brief   Main program.
- *
- * @return  none
- */
 int main(void)
 {
     // configure core
@@ -126,10 +119,10 @@ int main(void)
     while(1) {
         __WFI();
 
-        // after sending LEDs, run our program
+        // after sending LEDs, run LED render program
         // to update the LED buffer for next time
         // we have approx 7ms to render... plenty of time
-        if ((ticnt & 0xf) == 3) {
+        if ((ticnt & 0x3) == 0) {
             ui_render();
         }
     }