diff --git a/firmware/litex-fw/Cargo.lock b/firmware/litex-fw/Cargo.lock
index bf97b5a..ad74c15 100644
--- a/firmware/litex-fw/Cargo.lock
+++ b/firmware/litex-fw/Cargo.lock
@@ -11,6 +11,27 @@ dependencies = [
  "memchr",
 ]
 
+[[package]]
+name = "atomic-polyfill"
+version = "0.1.11"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e3ff7eb3f316534d83a8a2c3d1674ace8a5a71198eba31e2e2b597833f699b28"
+dependencies = [
+ "critical-section",
+]
+
+[[package]]
+name = "autocfg"
+version = "1.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d468802bab17cbc0cc575e9b053f41e72aa36bfa6b7f55e3529ffa43161b97fa"
+
+[[package]]
+name = "az"
+version = "1.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7b7e4c2464d97fe331d41de9d5db0def0a96f4d823b8b32a2efd503578988973"
+
 [[package]]
 name = "bit_field"
 version = "0.10.2"
@@ -23,6 +44,12 @@ version = "1.3.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "bef38d45163c2f1dde094a7dfd33ccf595c92905c8f8f4fdc18d06fb1037718a"
 
+[[package]]
+name = "byteorder"
+version = "1.4.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "14c189c53d098945499cdfa7ecc63567cf3886b3332b312a5b4585d8d3a6a610"
+
 [[package]]
 name = "critical-section"
 version = "1.1.2"
@@ -67,6 +94,29 @@ version = "1.9.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "a26ae43d7bcc3b814de94796a5e736d4029efb0ee900c12e2d54c993ad1a1e07"
 
+[[package]]
+name = "embedded-graphics"
+version = "0.8.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0649998afacf6d575d126d83e68b78c0ab0e00ca2ac7e9b3db11b4cbe8274ef0"
+dependencies = [
+ "az",
+ "byteorder",
+ "embedded-graphics-core",
+ "float-cmp",
+ "micromath",
+]
+
+[[package]]
+name = "embedded-graphics-core"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ba9ecd261f991856250d2207f6d8376946cd9f412a2165d3b75bc87a0bc7a044"
+dependencies = [
+ "az",
+ "byteorder",
+]
+
 [[package]]
 name = "embedded-hal"
 version = "0.2.7"
@@ -87,6 +137,37 @@ dependencies = [
  "nb 1.1.0",
 ]
 
+[[package]]
+name = "float-cmp"
+version = "0.9.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "98de4bbd547a563b716d8dfa9aad1cb19bfab00f4fa09a6a4ed21dbcf44ce9c4"
+dependencies = [
+ "num-traits",
+]
+
+[[package]]
+name = "hash32"
+version = "0.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b0c35f58762feb77d74ebe43bdbc3210f09be9fe6742234d573bacc26ed92b67"
+dependencies = [
+ "byteorder",
+]
+
+[[package]]
+name = "heapless"
+version = "0.7.16"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "db04bc24a18b9ea980628ecf00e6c0264f3c1426dac36c00cb49b6fbad8b0743"
+dependencies = [
+ "atomic-polyfill",
+ "hash32",
+ "rustc_version",
+ "spin",
+ "stable_deref_trait",
+]
+
 [[package]]
 name = "itertools"
 version = "0.7.11"
@@ -107,12 +188,13 @@ name = "litex-fw"
 version = "0.1.0"
 dependencies = [
  "defmt",
+ "embedded-graphics",
  "embedded-midi",
+ "heapless",
  "litex-hal",
  "litex-pac",
  "micromath",
  "midi-types",
- "panic-halt",
  "paste",
  "riscv",
  "riscv-rt",
@@ -138,6 +220,16 @@ dependencies = [
  "vcell",
 ]
 
+[[package]]
+name = "lock_api"
+version = "0.4.10"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c1cc9717a20b1bb222f333e6a92fd32f7d8a18ddc5a3191a11af45dcbf4dcd16"
+dependencies = [
+ "autocfg",
+ "scopeguard",
+]
+
 [[package]]
 name = "memchr"
 version = "2.5.0"
@@ -181,10 +273,13 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "8d5439c4ad607c3c23abf66de8c8bf57ba8adcd1f129e699851a6e43935d339d"
 
 [[package]]
-name = "panic-halt"
-version = "0.2.0"
+name = "num-traits"
+version = "0.2.16"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "de96540e0ebde571dc55c73d60ef407c653844e6f9a1e2fdbd40c07b9252d812"
+checksum = "f30b0abd723be7e2ffca1272140fac1a2f084c77ec3e123c192b66af1ee9e6c2"
+dependencies = [
+ "autocfg",
+]
 
 [[package]]
 name = "paste"
@@ -313,21 +408,58 @@ dependencies = [
  "regex",
 ]
 
+[[package]]
+name = "rustc_version"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "bfa0f585226d2e68097d4f95d113b15b83a82e819ab25717ec0590d9584ef366"
+dependencies = [
+ "semver",
+]
+
+[[package]]
+name = "scopeguard"
+version = "1.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "94143f37725109f92c262ed2cf5e59bce7498c01bcc1502d7b9afe439a4e9f49"
+
+[[package]]
+name = "semver"
+version = "1.0.18"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b0293b4b29daaf487284529cc2f5675b8e57c61f70167ba415a463651fd6a918"
+
 [[package]]
 name = "seq-macro"
 version = "0.3.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "a3f0bf26fd526d2a95683cd0f87bf103b8539e2ca1ef48ce002d67aad59aa0b4"
 
+[[package]]
+name = "spin"
+version = "0.9.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6980e8d7511241f8acf4aebddbb1ff938df5eebe98691418c4468d0b72a96a67"
+dependencies = [
+ "lock_api",
+]
+
 [[package]]
 name = "ssd1322"
 version = "0.3.0"
 dependencies = [
+ "embedded-graphics",
  "embedded-hal",
  "itertools",
  "nb 0.1.3",
 ]
 
+[[package]]
+name = "stable_deref_trait"
+version = "1.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a8f112729512f8e442d81f95a8a7ddf2b7c6b8a1a6f509a95864142b30cab2d3"
+
 [[package]]
 name = "syn"
 version = "1.0.109"
diff --git a/firmware/litex-fw/Cargo.toml b/firmware/litex-fw/Cargo.toml
index 01b8dc5..32f1e63 100644
--- a/firmware/litex-fw/Cargo.toml
+++ b/firmware/litex-fw/Cargo.toml
@@ -8,7 +8,6 @@ edition = "2021"
 [dependencies]
 riscv = "*"
 riscv-rt = "*"
-panic-halt = "*"
 litex-hal = { path = "../deps/rust-litex-hal", features = ["gpio"] }
 litex-pac = { path = "../litex-pac", features = ["rt"] }
 ssd1322 = { path = "../ssd1322", features = [] }
@@ -18,3 +17,5 @@ micromath = "2.0.0"
 midi-types = "0.1.7"
 seq-macro = "0.3.5"
 paste = "1.0.14"
+embedded-graphics = "0.8.1"
+heapless = "0.7.16"
diff --git a/firmware/litex-fw/src/main.rs b/firmware/litex-fw/src/main.rs
index 983e61a..f48a89d 100644
--- a/firmware/litex-fw/src/main.rs
+++ b/firmware/litex-fw/src/main.rs
@@ -10,7 +10,16 @@ use litex_pac as pac;
 use riscv;
 use riscv_rt::entry;
 use litex_hal::hal::digital::v2::OutputPin;
-use core::iter;
+use heapless::String;
+use core::fmt::Write;
+
+use embedded_graphics::{
+    pixelcolor::{Gray4, GrayColor},
+    primitives::{Circle, PrimitiveStyle, PrimitiveStyleBuilder},
+    mono_font::{ascii::FONT_6X10, MonoTextStyle},
+    prelude::*,
+    text::Text,
+};
 
 use ssd1322 as oled;
 
@@ -118,11 +127,30 @@ fn main() -> ! {
     timer.delay_ms(10_u16);
     rstn.set_high().unwrap();
 
+    timer.delay_ms(1_u16);
+
+     disp.init(
+           oled::Config::new(
+               oled::ComScanDirection::RowZeroLast,
+               oled::ComLayout::DualProgressive,
+           ).clock_fosc_divset(9, 1)
+               .display_enhancements(true, true)
+               .contrast_current(159)
+               .phase_lengths(5, 14)
+               .precharge_voltage(31)
+               .second_precharge_period(8)
+               .com_deselect_voltage(7),
+       ).unwrap();
 
 
     defmt::info!("Starting main loop --");
 
     loop {
+        /*
+
+        defmt::info!("tick - elapsed {} sec", elapsed);
+        elapsed += 1.0f32;
+
         defmt::info!("PMOD0");
         defmt::info!("jack_detect {=u8:x}", peripherals.EURORACK_PMOD0.csr_jack.read().bits() as u8);
         defmt::info!("input0 {}", peripherals.EURORACK_PMOD0.csr_cal_in0.read().bits() as i16);
@@ -139,38 +167,52 @@ fn main() -> ! {
         defmt::info!("input3 {}", peripherals.EURORACK_PMOD1.csr_cal_in3.read().bits() as i16);
         defmt::info!("serial {=u32:x}", peripherals.EURORACK_PMOD1.csr_eeprom_serial.read().bits() as u32);
         timer.delay_ms(1000u32);
+        */
 
-        disp.init(
-            oled::Config::new(
-                oled::ComScanDirection::RowZeroLast,
-                oled::ComLayout::DualProgressive,
-            ).clock_fosc_divset(9, 1)
-                .display_enhancements(true, true)
-                .contrast_current(159)
-                .phase_lengths(5, 14)
-                .precharge_voltage(31)
-                .second_precharge_period(8)
-                .com_deselect_voltage(7),
-        ).unwrap();
+        let rect_style = PrimitiveStyleBuilder::new()
+            .stroke_color(Gray4::new(0x5))
+            .stroke_width(1)
+            .fill_color(Gray4::BLACK)
+            .build();
 
-        timer.delay_ms(1000u32);
+        disp
+            .bounding_box()
+            .into_styled(rect_style)
+            .draw(&mut disp).ok();
 
-        // Get a region covering the entire display area, and clear it by writing all zeros.
-        {
-            let mut region = disp
-                .region(oled::PixelCoord(0, 0), oled::PixelCoord(128, 128))
-                .unwrap();
-            region.draw_packed(iter::repeat(0x0f)).unwrap();
-        }
+        let circle = Circle::new(Point::new(22, 22), 20)
+            .into_styled(PrimitiveStyle::with_stroke(Gray4::WHITE, 1));
 
-        {
-            let mut region = disp
-                .region(oled::PixelCoord(128, 0), oled::PixelCoord(256, 128))
-                .unwrap();
-            region.draw_packed(iter::repeat(0x10)).unwrap();
-        }
+        circle.draw(&mut disp).unwrap();
+
+        let style = MonoTextStyle::new(&FONT_6X10, Gray4::WHITE);
+
+        Text::new("Hello,\nRust!", Point::new(0, 12), style).draw(&mut disp).ok();
+
+        let mut s: String<128> = String::new();
+        write!(&mut s, "serial0 {:#06x}", peripherals.EURORACK_PMOD0.csr_eeprom_serial.read().bits() as u32).ok();
+
+        Text::new(&s, Point::new(128, 12), style).draw(&mut disp).ok();
+
+        s.clear();
+
+        write!(&mut s, "serial1 {:#06x}", peripherals.EURORACK_PMOD1.csr_eeprom_serial.read().bits() as u32).ok();
+
+        Text::new(&s, Point::new(128, 24), style).draw(&mut disp).ok();
+
+        s.clear();
+
+        write!(&mut s, "jack0 {:#06x}", peripherals.EURORACK_PMOD0.csr_jack.read().bits() as u32).ok();
+
+        Text::new(&s, Point::new(128, 36), style).draw(&mut disp).ok();
+
+        s.clear();
+
+        write!(&mut s, "jack1 {:#06x}", peripherals.EURORACK_PMOD1.csr_jack.read().bits() as u32).ok();
+
+        Text::new(&s, Point::new(128, 48), style).draw(&mut disp).ok();
+
+        disp.flush();
 
-        defmt::info!("tick - elapsed {} sec", elapsed);
-        elapsed += 1.0f32;
     }
 }
diff --git a/firmware/ssd1322 b/firmware/ssd1322
index 65ced3f..da053bf 160000
--- a/firmware/ssd1322
+++ b/firmware/ssd1322
@@ -1 +1 @@
-Subproject commit 65ced3f472f3e0fc5f812e94df7afdd4840de76d
+Subproject commit da053bfbd1e0e16b727548215b2d51814425b8e9