diff --git a/src/blink_led.c b/src/blink_led.c
index 078c137..9df901b 100644
--- a/src/blink_led.c
+++ b/src/blink_led.c
@@ -3,6 +3,7 @@
 #define NO_BIT_DEFINES
 #include <pic14regs.h>
 #include <stdint.h> 
+#include <stdbool.h>
 
 // Oscillator Selection bits (INTOSCIO oscillator: I/O function on RA6/OSC2/CLKOUT pin, I/O function on RA7/OSC1/CLKIN),
 // disable watchdog,
@@ -11,6 +12,7 @@
 __code uint16_t __at (_CONFIG1) __configword = _FOSC_INTOSC & _CLKOUTEN_OFF & _WDTE_OFF & _BOREN_ON & _CP_OFF;
 
 #define LED_PORT PORTAbits.RA5
+#define HASCH PIR1bits.RCIF
 
 // board layout:
 // mosfets clockwise from power feed:
@@ -21,7 +23,7 @@ __code uint16_t __at (_CONFIG1) __configword = _FOSC_INTOSC & _CLKOUTEN_OFF & _W
 static inline void delay(uint8_t us)
 {
   TMR1L = 0;
-  while(TMR1L < us);
+  while(TMR1L < us && !HASCH);
 }
 #define ADDTOUINT16(REG, LIT) __asm \
   BANKSEL REG \
@@ -38,12 +40,102 @@ static inline void delay(uint8_t us)
   SUBWFB _##REG##H, F \
   __endasm
 #define PPSO_PWM1 3
+#define STX 0x02
+#define ETX 0x03
+uint8_t animating = 0;
+struct animate_data {
+  uint8_t stepH;
+  uint8_t stepL;
+  uint8_t countH;
+  uint8_t countL;
+  uint8_t interval;
+} animate_data[4];
+void handle_input(unsigned char input) {
+  static uint8_t cnt = 0;
+  static uint8_t buf[7];
+  // STX CMD A B C D PARITY ETX
+  // STX 01__ abcd PWMxDCH PWMxDCL PWMxPRH  PWMxPRL ignored  PARITY ETX // abcd = applicable pwm's
+  // STX 11__ abcd stepH   stepL   countH  countL   interval PARITY ETX
+  switch (cnt) {
+  case 0:
+    if (input == STX) {
+      cnt++;
+    }
+    return;
+  case 1: case 2: case 3: case 4: case 5: case 6:
+    buf[cnt - 1] = input;
+    cnt++;
+    return;
+  case 7:
+    // check parity
+    cnt++;
+    return;
+  case 8:
+    cnt = 0;
+    if (input != ETX) return;
+    if ((buf[0] & 0xC0) == 0x40) {
+      // echo -n -e '\x02O\x90\x13\xFF\xFF\x00\x00\x03' > /dev/ttyUSB0
+      // SET packet
+      if (buf[0] & 0x8) {
+        // A
+        PWM1DCH = buf[1];
+        PWM1DCL = buf[2];
+        PWM1PRH = buf[3];
+        PWM1PRL = buf[4];
+        PWM1LDCON  = 0x80;  // load armed
+      }
+      if (buf[0] & 0x4) {
+        // B
+      }
+      if (buf[0] & 0x2) {
+        // C
+      }
+      if (buf[0] & 0x1) {
+        // D
+      }
+      return;
+    }
+    if ((buf[0] & 0xC0) == 0xC0) {
+      // ANIMATE packet
+      if (buf[0] & 0x8) {
+        // A
+        animate_data[0].stepH = buf[1];
+        animate_data[0].stepL = buf[2];
+        animate_data[0].countH = buf[3];
+        animate_data[0].countL = buf[4];
+        animate_data[0].interval = buf[5];
+        animating |= 1;
+      }
+    }
+  }  
+}
+unsigned char getch() {
+  // will freeze if you call this without any byte being available
+  while(PIR1bits.RCIF == 0);
+  PIR1bits.RCIF = 0;
+  // framing error: TODO
+  // if (RCSTAbits.FERR) yolo
+  
+  // deal with overflow error
+  // TODO: should you do this before reading RCREG?
+  if (RCSTAbits.OERR) {
+    RCSTAbits.CREN = 0;
+    RCSTAbits.CREN = 1;
+  }
+  return RCREG;
+  
+}
+// messages:
+// set PR DC
+// fade period step
+
 void main(void)
 {
   OSCCON = 0xf0;
-  TRISC = 0;
+  TRISCbits.TRISC5 = 1;
   T1CON = 0x31; // timer1 at 1 mhz, so 1us
   ANSELA = 0;
+  ANSELC = 0;
   TRISA = 0;
   //SLRCONC = 0;
   LED_PORT = 0;
@@ -62,18 +154,33 @@ void main(void)
 
     RA5PPS = PPSO_PWM1;
 
-
+    BAUDCONbits.BRG16 = 1;
+    TXSTAbits.BRGH = 0;
+    SPBRGH = 3; // 832, baud rate 2400.96
+    SPBRGL = 64;
+    RCSTAbits.CREN = 1;
+    TXSTAbits.SYNC = 0;
+    RCSTAbits.SPEN = 1;
     while(1) {
-      while (PWM1DCL < 0xFF || PWM1DCH < 0xFE) {
+      if (HASCH) handle_input(getch());
+      if (animating & 0x1) {
         ADDTOUINT16(PWM1DC, 1);
-          
         PWMLD = 1;
-        delay(50);
-      }
-      while (PWM1DCL > 0 || PWM1DCH > 0) {
-        SUBFROMUINT16(PWM1DC, 1);
-        PWMLD = 1;
-        delay(50);
       }
+      delay(50);
     }
+
+    /* while(1) { */
+    /*   while (PWM1DCL < 0xFF || PWM1DCH < 0xFE) { */
+    /*     ADDTOUINT16(PWM1DC, 1); */
+          
+    /*     PWMLD = 1; */
+    /*     delay(50); */
+    /*   } */
+    /*   while (PWM1DCL > 0 || PWM1DCH > 0) { */
+    /*     SUBFROMUINT16(PWM1DC, 1); */
+    /*     PWMLD = 1; */
+    /*     delay(50); */
+    /*   } */
+    /* } */
 }