diff --git a/core/include/esp/gpio_regs.h b/core/include/esp/gpio_regs.h
index c5a446c..167a4d1 100644
--- a/core/include/esp/gpio_regs.h
+++ b/core/include/esp/gpio_regs.h
@@ -70,7 +70,7 @@ struct GPIO_REGS {
     uint32_t volatile STATUS_SET;       // 0x20
     uint32_t volatile STATUS_CLEAR;     // 0x24
     uint32_t volatile CONF[16];         // 0x28 - 0x64
-    uint32_t volatile PWM;              // 0x68
+    uint32_t volatile DSM;              // 0x68
     uint32_t volatile RTC_CALIB;        // 0x6c
     uint32_t volatile RTC_CALIB_RESULT; // 0x70
 };
@@ -117,9 +117,9 @@ _Static_assert(sizeof(struct GPIO_REGS) == 0x74, "GPIO_REGS is the wrong size");
  *     GPIO_CONF_OPEN_DRAIN does not appear to work on all pins.
  *
  *
- * GPIO_CONF_SOURCE_PWM (boolean)
- *     When set, GPIO pin output will be connected to the sigma-delta PWM
- *     generator (controlled by the GPIO.PWM register).  When cleared, pin
+ * GPIO_CONF_SOURCE_DSM (boolean)
+ *     When set, GPIO pin output will be connected to the sigma-delta
+ *     generator (controlled by the GPIO.DSM register).  When cleared, pin
  *     output will function as a normal GPIO output (controlled by the
  *     GPIO.OUT* registers).
  */
@@ -130,7 +130,7 @@ _Static_assert(sizeof(struct GPIO_REGS) == 0x74, "GPIO_REGS is the wrong size");
 #define GPIO_CONF_INTTYPE_M      0x00000007
 #define GPIO_CONF_INTTYPE_S      7
 #define GPIO_CONF_OPEN_DRAIN     BIT(2)
-#define GPIO_CONF_SOURCE_PWM     BIT(0)
+#define GPIO_CONF_SOURCE_DSM     BIT(0)
 
 /* Valid values for the GPIO_CONF_INTTYPE field */
 typedef enum {
@@ -142,13 +142,13 @@ typedef enum {
     GPIO_INTTYPE_LEVEL_HIGH = 5,
 } gpio_inttype_t;
 
-/* Details for PWM register */
+/* Details for DSM register */
 
-#define GPIO_PWM_ENABLE          BIT(16)
-#define GPIO_PWM_PRESCALER_M     0x000000ff
-#define GPIO_PWM_PRESCALER_S     8
-#define GPIO_PWM_TARGET_M        0x000000ff
-#define GPIO_PWM_TARGET_S        0
+#define GPIO_DSM_ENABLE          BIT(16)
+#define GPIO_DSM_PRESCALER_M     0x000000ff
+#define GPIO_DSM_PRESCALER_S     8
+#define GPIO_DSM_TARGET_M        0x000000ff
+#define GPIO_DSM_TARGET_S        0
 
 /* Details for RTC_CALIB register */
 
diff --git a/extras/dsm/dsm.c b/extras/dsm/dsm.c
index 2a9657d..f232a93 100644
--- a/extras/dsm/dsm.c
+++ b/extras/dsm/dsm.c
@@ -21,7 +21,7 @@ typedef struct dsmInfoDefinition
 {
     uint8_t running;
     uint8_t preScale;
-    uint8_t dutyCycle;
+    uint8_t target;
     bool output;
 
     /* private */
@@ -36,7 +36,7 @@ void dsm_init(uint8_t npins, const uint8_t* pins)
     /* Assert number of pins is correct */
     if (npins > MAX_DSM_PINS)
     {
-        debug("Incorrect number of PWM pins (%d)\n", npins);
+        debug("Incorrect number of DSM pins (%d)\n", npins);
         return;
     }
 
@@ -70,12 +70,12 @@ void dsm_set_prescale(uint8_t prescale)
 // Freq = (80,000,000/prescale) * ((256 - target) / 256)  HZ  (128 < target < 256)
 void dsm_set_target(uint8_t target)
 {
-    dsmInfo.dutyCycle = target;
+    dsmInfo.target = target;
     if (target == 0 || target == UINT8_MAX)
     {
       dsmInfo.output = (target == UINT8_MAX);
     }
-    debug("Duty set at %u",dsmInfo.dutyCycle);
+    debug("Duty set at %u",dsmInfo.target);
     if (dsmInfo.running)
     {
         dsm_start();
@@ -84,13 +84,13 @@ void dsm_set_target(uint8_t target)
 
 void dsm_start()
 {
-    if (dsmInfo.dutyCycle > 0 && dsmInfo.dutyCycle < UINT8_MAX)
+    if (dsmInfo.target > 0 && dsmInfo.target < UINT8_MAX)
     {
         for (uint8_t i = 0; i < dsmInfo.usedPins; ++i)
         {
-            SET_MASK_BITS(GPIO.CONF[dsmInfo.pins[i]], GPIO_CONF_SOURCE_PWM);
+            SET_MASK_BITS(GPIO.CONF[dsmInfo.pins[i]], GPIO_CONF_SOURCE_DSM);
         }
-        GPIO.PWM = GPIO_PWM_ENABLE | (dsmInfo.preScale << 8) | dsmInfo.dutyCycle;
+        GPIO.DSM = GPIO_DSM_ENABLE | (dsmInfo.preScale << 8) | dsmInfo.target;
     }
     else
     {
@@ -107,7 +107,7 @@ void dsm_stop()
 {
     for (uint8_t i = 0; i < dsmInfo.usedPins; ++i)
     {
-      CLEAR_MASK_BITS(GPIO.CONF[dsmInfo.pins[i]], GPIO_CONF_SOURCE_PWM);
+      CLEAR_MASK_BITS(GPIO.CONF[dsmInfo.pins[i]], GPIO_CONF_SOURCE_DSM);
       gpio_write(dsmInfo.pins[i], false);
     }       
     debug("stop");