diff --git a/framework/rsc_enum.h b/framework/rsc_enum.h
index 7a1957e..fdb21ea 100644
--- a/framework/rsc_enum.h
+++ b/framework/rsc_enum.h
@@ -12,7 +12,7 @@
     X(SPI1) X(SPI2) X(SPI3) \
     X(I2C1) X(I2C2) X(I2C3) \
     X(ADC1) X(ADC2) X(ADC3) X(ADC4) \
-    X(DAC1) X(DAC2) \
+    X(DAC1) \
     X(TSC) \
     X(USART1) X(USART2) X(USART3) X(USART4) X(USART5) X(USART6) \
     X(TIM1) X(TIM2) X(TIM3) X(TIM4) X(TIM5) \
diff --git a/gex.mk b/gex.mk
index f0732f9..5921c08 100644
--- a/gex.mk
+++ b/gex.mk
@@ -18,6 +18,7 @@ GEX_SRC_DIR = \
     User/units/fcap \
     User/units/touch \
     User/units/simple_pwm \
+    User/units/dac \
     User/TinyFrame \
     User/CWPack \
     User/tasks
diff --git a/platform/platform.c b/platform/platform.c
index 69db7c4..9279445 100644
--- a/platform/platform.c
+++ b/platform/platform.c
@@ -2,6 +2,7 @@
 // Created by MightyPork on 2017/11/26.
 //
 
+#include <units/dac/unit_dac.h>
 #include "platform.h"
 #include "usbd_core.h"
 #include "USB/usb_device.h"
@@ -94,6 +95,7 @@ void plat_init_resources(void)
     ureg_add_type(&UNIT_FCAP);
     ureg_add_type(&UNIT_TOUCH);
     ureg_add_type(&UNIT_PWMDIM);
+    ureg_add_type(&UNIT_DAC);
 
     // Free all present resources
     {
diff --git a/units/dac/_dac_api.c b/units/dac/_dac_api.c
new file mode 100644
index 0000000..a02559f
--- /dev/null
+++ b/units/dac/_dac_api.c
@@ -0,0 +1,40 @@
+//
+// Created by MightyPork on 2018/02/03.
+//
+
+#include "platform.h"
+#include "unit_base.h"
+#include "unit_dac.h"
+
+#define DAC_INTERNAL
+#include "_dac_internal.h"
+
+/**
+ * Re-configure the 
+ * @param unit
+ */
+void UDAC_Reconfigure(Unit *unit)
+{
+    struct priv *priv = unit->data;
+
+    DAC->CR &= ~(DAC_CR_EN1 | DAC_CR_EN2);
+    uint32_t CR = 0;
+    if (priv->cfg.ch1.enable) {
+        CR |=
+            (priv->cfg.ch1.buffered ? 0 : DAC_CR_BOFF1) |
+            (priv->cfg.ch1.noise_type << DAC_CR_WAVE1_Pos) |
+            (priv->cfg.ch1.noise_level & 0xF) << DAC_CR_MAMP1_Pos |
+            (0b111 << DAC_CR_TSEL1_Pos); // software trigger;
+
+        CR |= DAC_CR_EN1;
+    }
+    if (priv->cfg.ch2.enable) {
+        CR |=
+            (priv->cfg.ch2.buffered ? 0 : DAC_CR_BOFF2) |
+            (priv->cfg.ch2.noise_type << DAC_CR_WAVE2_Pos) |
+            (priv->cfg.ch2.noise_level & 0xF) << DAC_CR_MAMP2_Pos |
+            (0b111 << DAC_CR_TSEL2_Pos); // software trigger
+        CR |= DAC_CR_EN2;
+    }
+    DAC->CR = CR;
+}
diff --git a/units/dac/_dac_init.c b/units/dac/_dac_init.c
new file mode 100644
index 0000000..847cb6e
--- /dev/null
+++ b/units/dac/_dac_init.c
@@ -0,0 +1,99 @@
+//
+// Created by MightyPork on 2018/02/03.
+//
+
+#include "platform.h"
+#include "unit_base.h"
+
+#define DAC_INTERNAL
+#include "_dac_internal.h"
+
+/** Allocate data structure and set defaults */
+error_t UDAC_preInit(Unit *unit)
+{
+    struct priv *priv = unit->data = calloc_ck(1, sizeof(struct priv));
+    if (priv == NULL) return E_OUT_OF_MEM;
+
+    priv->cfg.ch1.buffered = true;
+    priv->cfg.ch1.enable = true;
+    priv->cfg.ch1.noise_level = 2;
+    priv->cfg.ch1.noise_type = NOISE_NONE;
+
+    priv->ch1.noise_type = priv->cfg.ch1.noise_type;
+    priv->ch1.noise_level = priv->cfg.ch1.noise_level;
+
+    priv->cfg.ch2.buffered = true;
+    priv->cfg.ch2.enable = true;
+    priv->cfg.ch2.noise_level = 2;
+    priv->cfg.ch2.noise_type = NOISE_NONE;
+
+    priv->ch2.noise_type = priv->cfg.ch2.noise_type;
+    priv->ch2.noise_level = priv->cfg.ch2.noise_level;
+
+    return E_SUCCESS;
+}
+
+/** Finalize unit set-up */
+error_t UDAC_init(Unit *unit)
+{
+    bool suc = true;
+    struct priv *priv = unit->data;
+
+    // this may change for different devices
+    const Resource r_ch1 = R_PA4;
+    const Resource r_ch2 = R_PA5;
+
+    const bool e1 = priv->cfg.ch1.enable;
+    const bool e2 = priv->cfg.ch2.enable;
+
+
+    if (e1) {
+        TRY(rsc_claim(unit, r_ch1));
+    }
+
+    if (e2) {
+        TRY(rsc_claim(unit, r_ch2));
+    }
+
+    TRY(rsc_claim(unit, R_DAC1));
+
+    // ensure the peripheral is clean (this may be redundant)
+    __HAL_RCC_DAC1_FORCE_RESET();
+    __HAL_RCC_DAC1_RELEASE_RESET();
+
+    hw_periph_clock_enable(DAC1);
+
+    GPIO_TypeDef *port;
+    uint32_t ll;
+    if (e1) {
+        assert_param(hw_pinrsc2ll(r_ch1, &port, &ll));
+        LL_GPIO_SetPinMode(port, ll, LL_GPIO_MODE_ANALOG);
+    }
+    if (e2) {
+        assert_param(hw_pinrsc2ll(r_ch1, &port, &ll));
+        LL_GPIO_SetPinMode(port, ll, LL_GPIO_MODE_ANALOG);
+    }
+
+    UDAC_Reconfigure(unit);
+
+    return E_SUCCESS;
+}
+
+
+/** Tear down the unit */
+void UDAC_deInit(Unit *unit)
+{
+    struct priv *priv = unit->data;
+
+    // de-init peripherals
+    if (unit->status == E_SUCCESS ) {
+        LL_DAC_DeInit(DAC);
+        hw_periph_clock_disable(DAC1);
+    }
+
+    // Release all resources, deinit pins
+    rsc_teardown(unit);
+
+    // Free memory
+    free_ck(unit->data);
+}
diff --git a/units/dac/_dac_internal.h b/units/dac/_dac_internal.h
new file mode 100644
index 0000000..be376b2
--- /dev/null
+++ b/units/dac/_dac_internal.h
@@ -0,0 +1,73 @@
+//
+// Created by MightyPork on 2018/02/03.
+//
+
+#ifndef GEX_F072_DAC_INTERNAL_H
+#define GEX_F072_DAC_INTERNAL_H
+
+#ifndef DAC_INTERNAL
+#error bad include!
+#endif
+
+#include "unit_base.h"
+
+enum UDAC_Noise {
+    NOISE_NONE = 0b00,
+    NOISE_WHITE = 0b01,
+    NOISE_TRIANGLE = 0b10,
+};
+
+struct udac_channel_cfg {
+    bool enable;
+    bool buffered;
+    enum UDAC_Noise noise_type;
+    uint8_t noise_level; // 0-11
+};
+
+struct udac_channel_live {
+    enum UDAC_Noise noise_type;
+    uint8_t noise_level; // 0-11
+};
+
+/** Private data structure */
+struct priv {
+    // settings
+    struct {
+        struct udac_channel_cfg ch1;
+        struct udac_channel_cfg ch2;
+    } cfg;
+
+    // internal state
+    struct udac_channel_live ch1;
+    struct udac_channel_live ch2;
+    TIM_TypeDef *TIMx; // timer used for the DDS function
+};
+
+/** Allocate data structure and set defaults */
+error_t UDAC_preInit(Unit *unit);
+
+/** Load from a binary buffer stored in Flash */
+void UDAC_loadBinary(Unit *unit, PayloadParser *pp);
+
+/** Write to a binary buffer for storing in Flash */
+void UDAC_writeBinary(Unit *unit, PayloadBuilder *pb);
+
+// ------------------------------------------------------------------------
+
+/** Parse a key-value pair from the INI file */
+error_t UDAC_loadIni(Unit *unit, const char *key, const char *value);
+
+/** Generate INI file section for the unit */
+void UDAC_writeIni(Unit *unit, IniWriter *iw);
+
+// ------------------------------------------------------------------------
+
+/** Finalize unit set-up */
+error_t UDAC_init(Unit *unit);
+
+/** Tear down the unit */
+void UDAC_deInit(Unit *unit);
+
+void UDAC_Reconfigure(Unit *unit);
+
+#endif //GEX_F072_DAC_INTERNAL_H
diff --git a/units/dac/_dac_settings.c b/units/dac/_dac_settings.c
new file mode 100644
index 0000000..bbef170
--- /dev/null
+++ b/units/dac/_dac_settings.c
@@ -0,0 +1,131 @@
+//
+// Created by MightyPork on 2018/02/03.
+//
+
+#include "platform.h"
+#include "unit_base.h"
+
+#define DAC_INTERNAL
+#include "_dac_internal.h"
+
+/** Load from a binary buffer stored in Flash */
+void UDAC_loadBinary(Unit *unit, PayloadParser *pp)
+{
+    struct priv *priv = unit->data;
+
+    uint8_t version = pp_u8(pp);
+    (void)version;
+
+    priv->cfg.ch1.enable = pp_bool(pp);
+    priv->cfg.ch1.buffered = pp_bool(pp);
+    priv->cfg.ch1.noise_type = (enum UDAC_Noise) pp_u8(pp);
+    priv->cfg.ch1.noise_level = pp_u8(pp);
+
+    priv->cfg.ch2.enable = pp_bool(pp);
+    priv->cfg.ch2.buffered = pp_bool(pp);
+    priv->cfg.ch2.noise_type = (enum UDAC_Noise) pp_u8(pp);
+    priv->cfg.ch2.noise_level = pp_u8(pp);
+}
+
+/** Write to a binary buffer for storing in Flash */
+void UDAC_writeBinary(Unit *unit, PayloadBuilder *pb)
+{
+    struct priv *priv = unit->data;
+
+    pb_u8(pb, 0); // version
+
+    pb_bool(pb, priv->cfg.ch1.enable);
+    pb_bool(pb, priv->cfg.ch1.buffered);
+    pb_u8(pb, priv->cfg.ch1.noise_type);
+    pb_u8(pb, priv->cfg.ch1.noise_level);
+
+    pb_bool(pb, priv->cfg.ch2.enable);
+    pb_bool(pb, priv->cfg.ch2.buffered);
+    pb_u8(pb, priv->cfg.ch2.noise_type);
+    pb_u8(pb, priv->cfg.ch2.noise_level);
+}
+
+// ------------------------------------------------------------------------
+
+/** Parse a key-value pair from the INI file */
+error_t UDAC_loadIni(Unit *unit, const char *key, const char *value)
+{
+    bool suc = true;
+    struct priv *priv = unit->data;
+
+    // Ch1
+    if (streq(key, "ch1_enable")) {
+        priv->cfg.ch1.enable = cfg_bool_parse(value, &suc);
+    }
+    else if (streq(key, "ch1_buff")) {
+        priv->cfg.ch1.buffered = cfg_bool_parse(value, &suc);
+    }
+    else if (streq(key, "ch1_noise")) {
+        priv->cfg.ch1.noise_type =
+            (enum UDAC_Noise) cfg_enum3_parse(value,
+                                             "NONE", NOISE_NONE,
+                                             "WHITE", NOISE_WHITE,
+                                             "TRIANGLE", NOISE_TRIANGLE, &suc);
+    }
+    else if (streq(key, "ch1_noise-level")) {
+        uint8_t x = cfg_u8_parse(value, &suc);
+        if (x == 0) x = 1;
+        if (x > 12) x = 12;
+        priv->cfg.ch1.noise_level = (uint8_t) (x - 1);
+    }
+    // Ch2
+    else if (streq(key, "ch2_enable")) {
+        priv->cfg.ch2.enable = cfg_bool_parse(value, &suc);
+    }
+    else if (streq(key, "ch2_buff")) {
+        priv->cfg.ch2.buffered = cfg_bool_parse(value, &suc);
+    }
+    else if (streq(key, "ch2_noise")) {
+        priv->cfg.ch2.noise_type =
+            (enum UDAC_Noise) cfg_enum3_parse(value,
+                                              "NONE", NOISE_NONE,
+                                              "WHITE", NOISE_WHITE,
+                                              "TRIANGLE", NOISE_TRIANGLE, &suc);
+    }
+    else if (streq(key, "ch2_noise-level")) {
+        uint8_t x = cfg_u8_parse(value, &suc);
+        if (x == 0) x = 1;
+        if (x > 12) x = 12;
+        priv->cfg.ch2.noise_level = (uint8_t) (x - 1);
+    }
+    // end
+    else {
+        return E_BAD_KEY;
+    }
+
+    if (!suc) return E_BAD_VALUE;
+    return E_SUCCESS;
+}
+
+/** Generate INI file section for the unit */
+void UDAC_writeIni(Unit *unit, IniWriter *iw)
+{
+    struct priv *priv = unit->data;
+
+    iw_comment(iw, "Enabled channels (1:A4, 2:A5)");
+    iw_entry_s(iw, "ch1_enable", str_yn(priv->cfg.ch1.enable));
+    iw_entry_s(iw, "ch2_enable", str_yn(priv->cfg.ch2.enable));
+
+    iw_comment(iw, "Output buffering");
+    iw_entry_s(iw, "ch1_buff", str_yn(priv->cfg.ch1.buffered));
+    iw_entry_s(iw, "ch2_buff", str_yn(priv->cfg.ch2.buffered));
+
+    iw_comment(iw, "Superimposed noise type (NONE,WHITE,TRIANGLE)");
+    iw_entry_s(iw, "ch1_noise", cfg_enum3_encode(priv->cfg.ch1.noise_type,
+                                                 NOISE_NONE, "NONE",
+                                                 NOISE_WHITE, "WHITE",
+                                                 NOISE_TRIANGLE, "TRIANGLE"));
+    iw_entry_s(iw, "ch2_noise", cfg_enum3_encode(priv->cfg.ch2.noise_type,
+                                                 NOISE_NONE, "NONE",
+                                                 NOISE_WHITE, "WHITE",
+                                                 NOISE_TRIANGLE, "TRIANGLE"));
+
+    iw_comment(iw, "Noise amplitude (nbr. of bits,1-12)");
+    iw_entry_d(iw, "ch1_noise-level", priv->cfg.ch1.noise_level + 1);
+    iw_entry_d(iw, "ch2_noise-level", priv->cfg.ch2.noise_level + 1);
+}
diff --git a/units/dac/unit_dac.c b/units/dac/unit_dac.c
new file mode 100644
index 0000000..9908204
--- /dev/null
+++ b/units/dac/unit_dac.c
@@ -0,0 +1,59 @@
+//
+// Created by MightyPork on 2017/11/25.
+//
+
+#include "unit_base.h"
+#include "unit_dac.h"
+
+#define DAC_INTERNAL
+#include "_dac_internal.h"
+
+// ------------------------------------------------------------------------
+
+enum DacCmd_ {
+    CMD_SET_LEVEL,
+};
+
+/** Handle a request message */
+static error_t UDAC_handleRequest(Unit *unit, TF_ID frame_id, uint8_t command,
+                                  PayloadParser *pp)
+{
+    switch (command) {
+        case CMD_SET_LEVEL: {
+            uint16_t ch1 = pp_u16(pp);
+            uint16_t ch2 = pp_u16(pp);
+            uint32_t dual_reg = DAC->DHR12RD;
+            if (ch1 != 0xFFFF) {
+                dual_reg = (dual_reg & 0xFFFF0000) | ch1;
+            }
+            if (ch2 != 0xFFFF) {
+                dual_reg = (dual_reg & 0xFFFF) | (ch2<<16);
+            }
+            DAC->DHR12RD = dual_reg;
+            // Trigger a conversion
+            DAC->SWTRIGR = (DAC_SWTR_CH1 | DAC_SWTR_CH2);
+            return E_SUCCESS;
+        }
+        default:
+            return E_UNKNOWN_COMMAND;
+    }
+}
+
+// ------------------------------------------------------------------------
+
+/** Unit template */
+const UnitDriver UNIT_DAC = {
+    .name = "DAC",
+    .description = "Analog output",
+    // Settings
+    .preInit = UDAC_preInit,
+    .cfgLoadBinary = UDAC_loadBinary,
+    .cfgWriteBinary = UDAC_writeBinary,
+    .cfgLoadIni = UDAC_loadIni,
+    .cfgWriteIni = UDAC_writeIni,
+    // Init
+    .init = UDAC_init,
+    .deInit = UDAC_deInit,
+    // Function
+    .handleRequest = UDAC_handleRequest,
+};
diff --git a/units/dac/unit_dac.h b/units/dac/unit_dac.h
new file mode 100644
index 0000000..b224d8f
--- /dev/null
+++ b/units/dac/unit_dac.h
@@ -0,0 +1,16 @@
+//
+// Created by MightyPork on 2017/11/25.
+//
+// Digital input unit; single or multiple pin read access on one port (A-F)
+//
+
+#ifndef U_DAC_H
+#define U_DAC_H
+
+#include "unit.h"
+
+extern const UnitDriver UNIT_DAC;
+
+// UU_ prototypes
+
+#endif //U_DAC_H