diff --git a/src/main/esp32_eurorack_generic.c b/src/main/esp32_eurorack_generic.c
index 2882959..a169643 100644
--- a/src/main/esp32_eurorack_generic.c
+++ b/src/main/esp32_eurorack_generic.c
@@ -14,6 +14,9 @@
 #define DAC_LDAC_PIN 14
 
 #define DAC_ADDR 0x64 /* I2C Address of DAC */
+#define DAC_VREF 0x00 /* Use Vdd as reference voltage */
+#define DAC_PD 0x00 /* Full power mode */
+#define DAC_GAIN 0x00 /* Since we use external Vref, this doesn't matter */
 
 #define ACK_EN 0x1 /* Enable i2c acknowledgment check */
 #define ACK_DIS 0x0 /* Disable i2c acknowledgment check */
@@ -58,7 +61,7 @@ static esp_err_t dac_test(void)
   i2c_master_start(cmd);
   i2c_master_write_byte(cmd, (DAC_ADDR << 1) | I2C_MASTER_READ, ACK_EN); /* R/W byte is LSB of DAC address */
   i2c_master_stop(cmd);
-  esp_err_t ret = i2c_master_cmd_begin(I2C_MASTER_PORT, cmd, 10000 / portTICK_PERIOD_MS);
+  esp_err_t ret = i2c_master_cmd_begin(I2C_MASTER_PORT, cmd, 1000 / portTICK_PERIOD_MS);
   i2c_cmd_link_delete(cmd);
 
   return ret;
@@ -77,4 +80,36 @@ void app_main(void)
   } else {
     ESP_LOGI(TAG, "Sucessfully initialized DAC");
   }
+
+  uint16_t test_value = 0; /* The value sent to DAC input registers */
+  i2c_cmd_handle_t cmd;
+
+  /* Loop to test DAC output */
+  while (1) {
+    for (uint16_t i = 0; i < 4096; i++){
+
+      test_value = i;
+
+      cmd = i2c_cmd_link_create();
+      i2c_master_start(cmd);
+      i2c_master_write_byte(cmd, (DAC_ADDR << 1) | I2C_MASTER_WRITE, ACK_EN); /* R/W byte is LSB of DAC address */
+      i2c_master_write_byte(cmd, 0x50, ACK_EN); /* Multi-write to all channels */
+
+      /* For each channel [A-D] write 2 bytes to input register */
+      /* V_ref + PD1 + PD0 + Gx + D11-D8 | D7-D0 */
+      for (uint8_t i = 0; i < 4; i++) {
+        uint8_t bytes[2];
+        bytes[0] = ((uint8_t) DAC_VREF << 7) | ((uint8_t) DAC_PD << 5) | ((uint8_t) DAC_GAIN << 4) | (test_value >> 8);
+        bytes[1] = test_value;
+        i2c_master_write_byte(cmd, bytes[0], ACK_EN);
+        i2c_master_write_byte(cmd, bytes[1], ACK_EN);
+      }
+
+      i2c_master_stop(cmd);
+
+      /* Issue the multi-write command */
+      ret = i2c_master_cmd_begin(I2C_MASTER_PORT, cmd, 1000 / portTICK_PERIOD_MS);
+      i2c_cmd_link_delete(cmd);
+    }
+  }
 }