diff --git a/firmware/user/ch32v20x_conf.h b/firmware/user/ch32v20x_conf.h
index d1eeb38..d379f52 100644
--- a/firmware/user/ch32v20x_conf.h
+++ b/firmware/user/ch32v20x_conf.h
@@ -14,7 +14,7 @@
 
 #include "ch32v20x_adc.h"
 #include "ch32v20x_bkp.h"
-#include "ch32v20x_can.h"
+//#include "ch32v20x_can.h"
 #include "ch32v20x_crc.h"
 #include "ch32v20x_dbgmcu.h"
 #include "ch32v20x_dma.h"
@@ -26,7 +26,7 @@
 #include "ch32v20x_pwr.h"
 #include "ch32v20x_rcc.h"
 #include "ch32v20x_rtc.h"
-#include "ch32v20x_spi.h"
+//#include "ch32v20x_spi.h"
 #include "ch32v20x_tim.h"
 #include "ch32v20x_usart.h"
 #include "ch32v20x_wwdg.h"
diff --git a/firmware/user/main.c b/firmware/user/main.c
index d371c54..1d055eb 100644
--- a/firmware/user/main.c
+++ b/firmware/user/main.c
@@ -50,13 +50,6 @@ void gpio_init()
 
     gpio.GPIO_Speed = GPIO_Speed_2MHz;
 
-    // per the datasheet, PB8 is an output-only pin on this specific submodel.
-    // however, the datasheet later conflicts and says this is A/I/O pin.
-    // so we'll try to use it as an input anyway.
-    gpio.GPIO_Mode = GPIO_Mode_IN_FLOATING;
-    gpio.GPIO_Pin = GPIO_Pin_8;
-    GPIO_Init(GPIOB, &gpio);
-
     // unused osc pins
     gpio.GPIO_Mode = GPIO_Mode_IPD;
     gpio.GPIO_Pin = GPIO_Pin_0 | GPIO_Pin_7;
@@ -98,7 +91,7 @@ void gpio_init()
     gpio.GPIO_Pin = GPIO_Pin_15;
     GPIO_Init(GPIOA, &gpio);
 
-    // I2C on-board comms
+    // I2C SCL, SCA for on-board devices
     gpio.GPIO_Mode = GPIO_Mode_AF_OD;
     gpio.GPIO_Pin = GPIO_Pin_6 | GPIO_Pin_7;
     GPIO_Init(GPIOB, &gpio);
@@ -139,6 +132,10 @@ int main(void)
     // configure systick interrupt
     systick_init();
 
+    rgb[0] = 10;
+    rgb[1] = 10;
+    rgb[2] = 10;
+
     // do system shit
     while(1) {
         __WFI();
diff --git a/firmware/user/src/31fl3729.c b/firmware/user/src/31fl3729.c
index 33a0966..f4f492e 100644
--- a/firmware/user/src/31fl3729.c
+++ b/firmware/user/src/31fl3729.c
@@ -9,27 +9,36 @@
 #include "i2c.h"
 
 
-/* sends the IS31FL3729 general config.
+
+void is31fl3729_set_global_current(uint8_t i2c_addr, uint8_t global_current)
+{
+    i2c_write_reg_8b(i2c_addr, FL3729_REG_G_CURRENT, global_current);
+}
+
+void is31fl3729_set_scaling_current(uint8_t i2c_addr, uint8_t cs, uint8_t current)
+{
+    if (cs > 0xf) return;
+
+    i2c_write_reg_8b(i2c_addr, FL3729_REG_SCALING + cs, current);
+}
+
+/* sends the IS31FL3729 initial config.
  * does not configure per-channel current sink limits; do that separately.
  * does not configure other sane defaults; do that separately.
  */
-
 void is31fl3729_init(uint8_t i2c_addr, uint8_t config, uint8_t global_current)
 {
-    uint8_t buf;
-
     // enable device
 #ifdef FL3729_SDB_PORT
     FL3729_SDB_PORT->BSHR = FL3729_SDB_PIN;
 #endif
 
     // reset config registers
-    buf = FL3729_RESET_VALUE;
-    i2c_write_addr1b(i2c_addr, FL3729_REG_RESET, &buf, 1);
+    i2c_write_reg_8b(i2c_addr, FL3729_REG_CONFIG, FL3729_RESET_VALUE);
 
     // write initial config
-    i2c_write_addr1b(i2c_addr, FL3729_REG_CONFIG, &config, 1);
-    i2c_write_addr1b(i2c_addr, FL3729_REG_G_CURRENT, &global_current, 1);
+    i2c_write_reg_8b(i2c_addr, FL3729_REG_CONFIG, config);
+    is31fl3729_set_global_current(i2c_addr, global_current);
 }
 
 uint8_t is31fl3729_get_addr(uint8_t adpin)
@@ -38,26 +47,14 @@ uint8_t is31fl3729_get_addr(uint8_t adpin)
 }
 
 
-void is31fl3729_set_global_current(uint8_t i2c_addr, uint8_t current)
-{
-    i2c_write_addr1b(i2c_addr, FL3729_REG_G_CURRENT, &current, 1);
-}
-
-void is31fl3729_set_scaling_current(uint8_t i2c_addr, uint8_t cs, uint8_t current)
-{
-    if (cs > 0xf) return;
-
-    i2c_write_addr1b(i2c_addr, FL3729_REG_SCALING + cs, &current, 1);
-}
-
 /*
  * sets current limit of multiple outputs simultaneously, starting from CS1.
  * useful for initial register configuration.
  */
-void is31fl3729_set_scaling_current_multi(uint8_t i2c_addr, uint8_t *current, uint8_t count)
+void is31fl3729_set_scaling_current_multi(uint8_t i2c_addr, const uint8_t *current, uint8_t count)
 {
     if (!count) return;
-    count &= 0xf;
+    if (count > 16) count = 16;
 
     i2c_write_addr1b(i2c_addr, FL3729_REG_SCALING, current, count);
 }
@@ -67,9 +64,9 @@ void is31fl3729_set_scaling_current_multi(uint8_t i2c_addr, uint8_t *current, ui
  * sw:          first switch segment to update. usually set this to 1 for the first switch.
  *              if set to 0, will default to 1.
  * *out:        output data buffer
- * len:         length of buffer
+ * len:         length of buffer. up to end user to not exceed writing beyond register 0x90.
  */
-void is31fl3729_set_outputs(uint8_t i2c_addr, uint8_t sw, uint8_t *out, uint8_t len)
+void is31fl3729_set_outputs(uint8_t i2c_addr, uint8_t sw, const uint8_t *out, uint8_t len)
 {
     if (!sw) sw = 1;
 
diff --git a/firmware/user/src/31fl3729.h b/firmware/user/src/31fl3729.h
index b320b47..7e02317 100644
--- a/firmware/user/src/31fl3729.h
+++ b/firmware/user/src/31fl3729.h
@@ -25,24 +25,24 @@
 #define FL3729_REG_OUTPUT       0x01
 #define FL3729_REG_SCALING      0x90
 #define FL3729_REG_CONFIG       0xA0
-#define FL3729_REG_G_CURRENT    0xA1    // global current
-#define FL3729_REG_PUPD         0xB0    // pull up / pull down
-#define FL3729_REG_SS           0xB1    // spread spectrum
+#define FL3729_REG_G_CURRENT    0xA1        // global current
+#define FL3729_REG_PUPD         0xB0        // pull up / pull down
+#define FL3729_REG_SS           0xB1        // spread spectrum
 #define FL3729_REG_PWM          0xB2
 #define FL3729_REG_RESET        0xCF
 
 
-#define FL3729_GCC_MAX          64      // maximum global current level
+#define FL3729_GCC_MAX          64          // maximum global current level
 
-#define FL3729_CONF_SHDN_ENA    0
-#define FL3729_CONF_SHDN_DIS    ((1 << 0) << 0)
+#define FL3729_CONF_SSD_SHDN    (0 << 0)    // software shutdown
+#define FL3729_CONF_SSD_NRML    (1 << 0)    // normal operation
 
-#define FL3729_CONF_OSDE_OFF    0
-#define FL3729_CONF_OSDE_OPEN   ((1 << 0) << 1)
-#define FL3729_CONF_OSDE_SHORT  ((1 << 1) << 1)
+#define FL3729_CONF_OSDE_OFF    (0 << 1)
+#define FL3729_CONF_OSDE_OPEN   (1 << 1)
+#define FL3729_CONF_OSDE_SHORT  (2 << 1)
 
-#define FL3729_CONF_LOGIC_LOLEV 0
-#define FL3729_CONF_LOGIC_HILEV ((1 << 0) << 3)
+#define FL3729_CONF_LOGIC_LOLEV (0 << 3)
+#define FL3729_CONF_LOGIC_HILEV (1 << 3)
 
 #define FL3729_CONF_MATRIX_9x15 0x00
 #define FL3729_CONF_MATRIX_8x16 0x10
@@ -68,25 +68,15 @@
 
 
 
-
-/*
-typedef struct IS31FL3729_Conf {
-    uint8_t ad_pin;
-    uint8_t config;
-    uint8_t global_brightness;
-} IS31FL3729_Conf;
-*/
-
-
 void is31fl3729_init(uint8_t i2c_addr, uint8_t config, uint8_t global_current);
 
 uint8_t is31fl3729_get_addr(uint8_t adpin);
 
-void is31fl3729_set_global_current(uint8_t i2c_addr, uint8_t current);
+void is31fl3729_set_global_current(uint8_t i2c_addr, uint8_t global_current);
 void is31fl3729_set_scaling_current(uint8_t i2c_addr, uint8_t cs, uint8_t current);
-void is31fl3729_set_scaling_current_multi(uint8_t i2c_addr, uint8_t *current, uint8_t count);
+void is31fl3729_set_scaling_current_multi(uint8_t i2c_addr, const uint8_t *current, uint8_t count);
 
-void is31fl3729_set_outputs(uint8_t i2c_addr, uint8_t sw, uint8_t *out, uint8_t len);
+void is31fl3729_set_outputs(uint8_t i2c_addr, uint8_t sw, const uint8_t *out, uint8_t len);
 
 
 
diff --git a/firmware/user/src/config.c b/firmware/user/src/config.c
index 29613b0..53ed9a4 100644
--- a/firmware/user/src/config.c
+++ b/firmware/user/src/config.c
@@ -90,7 +90,7 @@ static uint16_t checksum()
 
 void userconf_load()
 {
-    uint8_t valid;
+    uint8_t valid = 0;
 
     uint8_t page = CONF_FLASH_PAGES;
 
diff --git a/firmware/user/src/i2c.c b/firmware/user/src/i2c.c
index f4e031b..cdcbf77 100644
--- a/firmware/user/src/i2c.c
+++ b/firmware/user/src/i2c.c
@@ -15,21 +15,17 @@
 
 
 
-#define I2C_TIMEOUT             0xffff
+#define I2C_TIMEOUT             0xefff
 #define I2C_TIMEOUT_ACK_POLL    0x180
 
-static uint32_t timeout;
+static uint16_t timeout;
 
 
 void i2c_init()
 {
-    GPIO_InitTypeDef gpio = {0};
     I2C_InitTypeDef i2c = {0};
 
-    gpio.GPIO_Pin = GPIO_Pin_1 | GPIO_Pin_2;
-    gpio.GPIO_Mode = GPIO_Mode_AF_OD;
-    gpio.GPIO_Speed = GPIO_Speed_2MHz;
-    GPIO_Init(GPIOC, &gpio);
+    // ensure GPIO pins are configured before initializing
 
     i2c.I2C_ClockSpeed = 666666;
     i2c.I2C_Mode = I2C_Mode_I2C;
@@ -100,7 +96,7 @@ uint8_t i2c_read_reg_8b(uint8_t addr, uint8_t reg)
     return dat;
 }
 
-int8_t i2c_write_addr1b(uint8_t addr, uint8_t reg, uint8_t *data, uint8_t len)
+int8_t i2c_write_addr1b(uint8_t addr, uint8_t reg, const uint8_t *data, uint8_t len)
 {
     timeout = I2C_TIMEOUT;
     while((I2C_GetFlagStatus(I2C1, I2C_FLAG_BUSY) != RESET) && timeout--);
@@ -122,7 +118,9 @@ int8_t i2c_write_addr1b(uint8_t addr, uint8_t reg, uint8_t *data, uint8_t len)
     if (!timeout) return -4;
 
     while (len) {
-        while(I2C_GetFlagStatus(I2C1, I2C_FLAG_TXE) != RESET) {
+        // fixme: can get stuck here if address isn't found.
+        // somehow all the above passes but this will fail
+        if (I2C_GetFlagStatus(I2C1, I2C_FLAG_TXE) != RESET) {
             I2C_SendData(I2C1, *data++);
             len--;
             while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED));
diff --git a/firmware/user/src/i2c.h b/firmware/user/src/i2c.h
index 78efdb0..a17fe48 100644
--- a/firmware/user/src/i2c.h
+++ b/firmware/user/src/i2c.h
@@ -17,7 +17,7 @@
 void i2c_init();
 
 int8_t i2c_read_addr1b(uint8_t addr, uint8_t reg, uint8_t *data, uint8_t len);
-int8_t i2c_write_addr1b(uint8_t addr, uint8_t reg, uint8_t *data, uint8_t len);
+int8_t i2c_write_addr1b(uint8_t addr, uint8_t reg, const uint8_t *data, uint8_t len);
 
 uint8_t i2c_read_reg_8b(uint8_t addr, uint8_t reg);
 void i2c_write_reg_8b(uint8_t addr, uint8_t reg, uint8_t dat);
diff --git a/firmware/user/src/led.c b/firmware/user/src/led.c
index 0047b93..4167c47 100644
--- a/firmware/user/src/led.c
+++ b/firmware/user/src/led.c
@@ -10,16 +10,16 @@
 
 #define FL3729_SW_COUNT      4  // switches utilized
 #define FL3729_CS_COUNT     16  // current sink outputs used by chip
-#define FL3729_G_CURRENT    16  // initial global current setting
+#define FL3729_G_CURRENT    15  // initial global current setting
 
 
 
-const uint8_t cs_currents[FL3729_CS_COUNT] = {
-        0xf0, 0xf0, 0xf0, 0xf0, 0xf0, 0xf0, 0xf0, 0xf0, 0xf0,
-        0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80
+static const uint8_t cs_currents[FL3729_CS_COUNT] = {
+        0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+        0x1f, 0x1f, 0x1f, 0x1f, 0x1f, 0x1f, 0x1f
 };
 
-const uint16_t pwm_cie_256in_1024out[] = {
+static const uint16_t pwm_cie_256in_1024out[] = {
     0,    0,    1,    1,    2,    2,    3,    3,    4,    4,    4,    5,    5,    6,    6,    7,
     7,    8,    8,    8,    9,    9,   10,   10,   11,   11,   12,   12,   13,   13,   14,   15,
    15,   16,   17,   17,   18,   19,   19,   20,   21,   22,   22,   23,   24,   25,   26,   27,
@@ -70,10 +70,10 @@ void led_init()
 
     // configure matrix
     is31fl3729_init(FL3729_ADDR,
-                    FL3729_CONF_SHDN_DIS | FL3729_CONF_OSDE_OFF | FL3729_CONF_MATRIX_4x16,
+                    FL3729_CONF_SSD_NRML | FL3729_CONF_OSDE_OFF | FL3729_CONF_MATRIX_4x16,
                     FL3729_G_CURRENT);
 
-    is31fl3729_set_scaling_current_multi(FL3729_ADDR, (uint8_t *)cs_currents, sizeof(cs_currents));
+    is31fl3729_set_scaling_current_multi(FL3729_ADDR, cs_currents, FL3729_CS_COUNT);
 
 
     // configure rear RGBLED
@@ -94,7 +94,7 @@ void led_init()
     TIM_CtrlPWMOutputs(RGB_TIM, ENABLE);
     TIM_OC1PreloadConfig(RGB_TIM, TIM_OCPreload_Disable);
     TIM_ARRPreloadConfig(RGB_TIM, ENABLE);
-    TIM_Cmd(TIM1, ENABLE);
+    TIM_Cmd(RGB_TIM, ENABLE);
 }
 
 void led_matrix_is_updated()
@@ -104,9 +104,41 @@ void led_matrix_is_updated()
 
 void led_matrix_send()
 {
+    int8_t i, j;
+    uint8_t out[64];
+
     // only render when there's something to render
     if (led_matrix_updated) {
-        is31fl3729_set_outputs(FL3729_ADDR, 1, (uint8_t *)&led, FL3729_SW_COUNT * FL3729_CS_COUNT);
+        // convert led matrix
+        j = 0;
+
+        // the pepper body is linear; starts from top left,
+        // goes counter-clockwise, and ends at the top part
+        for (i = 0; i < LED_PEP_COUNT; i += 4) {
+            out[j + (16*0)] = led.section.pep[i + 0];
+            out[j + (16*1)] = led.section.pep[i + 1];
+            out[j + (16*2)] = led.section.pep[i + 2];
+            out[j + (16*3)] = led.section.pep[i + 3];
+            j++;
+        }
+
+        // pepper hat is a bit more fucked up. I laid this out
+        // with the elements backwards. rushjob fuckup. oops.
+        // I would like to start from the bottom right, counter clockwise,
+        // ending up at pepper's top right.
+        // for (i = 0; i < LED_HAT_COUNT; i += 4) {    // clockwise starting from bottom right
+        j = 15;
+        for (i = 0; i < LED_HAT_COUNT; i += 4) {
+            out[j + (16*0)] = led.section.hat[i + 0];
+            out[j + (16*1)] = led.section.hat[i + 1];
+            out[j + (16*2)] = led.section.hat[i + 2];
+            out[j + (16*3)] = led.section.hat[i + 3];
+            j--;
+        }
+
+        // and send
+        is31fl3729_set_outputs(FL3729_ADDR, 1, out, FL3729_SW_COUNT * FL3729_CS_COUNT);
+        led_matrix_updated = 0;
     }
 }
 
diff --git a/firmware/user/src/led.h b/firmware/user/src/led.h
index e68c379..e5f4702 100644
--- a/firmware/user/src/led.h
+++ b/firmware/user/src/led.h
@@ -16,7 +16,7 @@
 #define FL3729_ADDR     (FL3729_BASE_ADDR | FL3729_ADPIN_GND)
 
 #define LED_PEP_COUNT   36      // all pepper body LEDs
-#define LED_PEP_NOTOP   31      // pepper body LEDs not including the part under the hat
+#define LED_PEP_NOTOP   30      // pepper body LEDs not including the part under the hat
 #define LED_HAT_COUNT   28      // all pepper hat LEDs
 #define LED_ALL_COUNT   (LED_PEP_COUNT + LED_HAT_COUNT)
 
@@ -24,10 +24,13 @@
 
 typedef struct LedMatrix {
     union {
-        uint8_t pep[LED_PEP_COUNT];
-        uint8_t hat[LED_HAT_COUNT];
+        uint8_t all[LED_ALL_COUNT];
+        struct section {
+            uint8_t pep[LED_PEP_COUNT];
+            uint8_t hat[LED_HAT_COUNT];
+        } section;
     };
-    uint8_t all[LED_ALL_COUNT];
+
 } LedMatrix;
 
 
diff --git a/firmware/user/src/ledprog_pep.c b/firmware/user/src/ledprog_pep.c
index cac1365..5e6de29 100644
--- a/firmware/user/src/ledprog_pep.c
+++ b/firmware/user/src/ledprog_pep.c
@@ -57,17 +57,17 @@ static void pep_0_flash(uint8_t tick)
         pep_work[1] ^= 0x1;
         if (pep_work[1] & 1) {
             for (i = 0; i < LED_PEP_COUNT; i++) {
-                led.pep[i] = out;
+                led.section.pep[i] = out;
             }
             for (i = 0; i < LED_HAT_COUNT; i++) {
-                led.hat[i] = out;
+                led.section.hat[i] = out;
             }
         } else {
             for (i = 0; i < LED_PEP_COUNT; i++) {
-                led.pep[i] = 0;
+                led.section.pep[i] = 0;
             }
             for (i = 0; i < LED_HAT_COUNT; i++) {
-                led.hat[i] = 0;
+                led.section.hat[i] = 0;
             }
         }
 
@@ -94,7 +94,7 @@ static void pep_1_sizzle(uint8_t tick)
     rnd2 = prng_get32();
 
     // are we going to spike an LED?
-    trig = (trig > 0xf2) ? 1 : 0;
+    trig = (trig > 0xfa) ? 1 : 0;
 
     if (trig) {
         // which LED?
@@ -106,13 +106,18 @@ static void pep_1_sizzle(uint8_t tick)
     for (i = 0; i < LED_PEP_NOTOP; i++) {
         if (trig && (rnd == i)) {
             // go bright on this LED
-            led.pep[i] = 200;
+            led.section.pep[i] = 0xcf;
+            // also on the prior LED
+            if (i)
+                led.section.pep[i - 1] = 0x80;
+            else if (i < LED_PEP_NOTOP - 1)
+                led.section.pep[i + 1] = 0x80;
         } else {
-            if      (led.pep[i] < 48) led.pep[i]++;
-            else if (led.pep[i] > 64) led.pep[i]--;
+            if      (led.section.pep[i] < 4) led.section.pep[i]++;
+            else if (led.section.pep[i] > 36) led.section.pep[i]--;
             else {
-                if (rnd2 & 1) led.pep[i]++;
-                else          led.pep[i]--;
+                if (rnd2 & 1) led.section.pep[i]++;
+                else          led.section.pep[i]--;
             }
 
             rnd2 >>= 1;
@@ -121,8 +126,10 @@ static void pep_1_sizzle(uint8_t tick)
 
     // the hat just gets lit normally
     for (i = 0; i < LED_HAT_COUNT; i++) {
-        led.hat[i] = 200;
+        led.section.hat[i] = 0x3f;
     }
+
+    led_matrix_is_updated();
 }
 
 /*
@@ -148,12 +155,12 @@ static void pep_2_loops(uint8_t tick)
     bot >>= 8;
 
     for (i = 0; i < LED_PEP_COUNT; i++) {
-        if (i == bot)        led.pep[i] = 255;
-        else if (led.pep[i]) led.pep[i]--;
+        if (i == bot)        led.section.pep[i] = 255;
+        else if (led.section.pep[i]) led.section.pep[i]--;
     }
     for (i = 0; i < LED_HAT_COUNT; i++) {
-        if (i == top)        led.hat[i] = 255;
-        else if (led.hat[i]) led.hat[i]--;
+        if (i == top)        led.section.hat[i] = 255;
+        else if (led.section.hat[i]) led.section.hat[i]--;
     }
 }
 
@@ -169,10 +176,10 @@ static void pep_3_neon_sign(uint8_t tick)
 
     // todo: implement flickering on/off
     for (i = 0; i < LED_PEP_COUNT; i++) {
-        led.pep[i] = (tick & 1) ? 255 : 200;
+        led.section.pep[i] = (tick & 1) ? 255 : 200;
     }
     for (i = 0; i < LED_HAT_COUNT; i++) {
-        led.hat[i] = (tick & 1) ? 255 : 200;
+        led.section.hat[i] = (tick & 1) ? 255 : 200;
     }
 
     led_matrix_is_updated();
@@ -195,10 +202,10 @@ static void pep_4_alternate(uint8_t tick)
 
     if (!pep_work[0]) {
         for (i = 0; i < LED_PEP_COUNT; i++) {
-            led.pep[i] = (pep_work[1] & 1) ? hi : lo;
+            led.section.pep[i] = (pep_work[1] & 1) ? hi : lo;
         }
         for (i = 0; i < LED_HAT_COUNT; i++) {
-            led.hat[i] = (pep_work[1] & 1) ? lo : hi;
+            led.section.hat[i] = (pep_work[1] & 1) ? lo : hi;
         }
 
         pep_work[0] = userconf.pep_conf[PEP_4][PEP_4_CONF_FLASH_RATE];
@@ -270,17 +277,17 @@ static void pep_5_nom(uint8_t tick)
 
             // set pepper body LEDs to initial on state (or off if pepper is fully eated)
             for (i = 0; i < LED_PEP_NOTOP; i++) {
-                led.pep[i] = end ? 255 : 0;
+                led.section.pep[i] = end ? 255 : 0;
             }
             // in this mode we need to light up the top pepper line
             for (i = LED_PEP_NOTOP; i < LED_PEP_COUNT; i++) {
-                led.pep[i] = 200;
+                led.section.pep[i] = 200;
             }
 
             // clear eated pepper portions, gonna cry
             if (end) {
                 for (i = start; i < end; i++) {
-                    led.pep[i] = 0;
+                    led.section.pep[i] = 0;
                 }
             }
 
@@ -294,7 +301,7 @@ static void pep_5_nom(uint8_t tick)
         }
 
         case 3: {   // regen the pepper
-            if (led.pep[pep_work[1]] >= 0xfe) {
+            if (led.section.pep[pep_work[1]] >= 0xfe) {
                 // next segment
                 pep_work[1]++;
                 if (pep_work[i] >= (LED_PEP_NOTOP - pep_work[i])) {
@@ -302,9 +309,9 @@ static void pep_5_nom(uint8_t tick)
                     pep_work[0] = 0;
                 }
             } else {
-                led.pep[pep_work[1]] += 2;
+                led.section.pep[pep_work[1]] += 2;
                 if (pep_work[1]) {
-                    led.pep[LED_PEP_NOTOP - pep_work[1]] = led.pep[pep_work[1]];
+                    led.section.pep[LED_PEP_NOTOP - pep_work[1]] = led.section.pep[pep_work[1]];
                 }
                 led_matrix_is_updated();
             }
@@ -368,10 +375,10 @@ void ledprog_pep_init()
 
     // reset LEDs
     for (i = 0; i < LED_PEP_COUNT; i++) {
-        led.pep[i] = 0;
+        led.section.pep[i] = 0;
     }
     for (i = 0; i < LED_HAT_COUNT; i++) {
-        led.hat[i] = 0;
+        led.section.hat[i] = 0;
     }
 
     // global program initialization
diff --git a/firmware/user/src/ui.c b/firmware/user/src/ui.c
index 229a180..f0fa26d 100644
--- a/firmware/user/src/ui.c
+++ b/firmware/user/src/ui.c
@@ -59,9 +59,40 @@ void ui_init()
     btn[1].cb_release = ui_btn_release_cb;
 }
 
+uint8_t tmp;
+
 void ui_render()
 {
     tick++;
 
-    ledprog_pep[0](tick);
+    switch (mode) {
+        case MODE_RUN: {
+            break;
+        }
+
+        case MODE_PROGRAM: {
+            break;
+        }
+
+        case MODE_PARAMETER: {
+            break;
+        }
+    }
+
+    // temporary: testing
+    ledprog_pep[1](tick);
+    /*
+    if ((tick & 3) == 3) {
+
+        tmp++;
+        tmp &= 0x3f;
+
+        for (uint8_t i = 0; i < 64; i++) {
+            if (i == tmp) led.all[i] = 255;
+            else led.all[i] = 0;
+        }
+
+        led_matrix_is_updated();
+    }
+    */
 }