diff --git a/README.md b/README.md
index c173e43..4cd9f49 100644
--- a/README.md
+++ b/README.md
@@ -261,6 +261,8 @@ python ./idf.py -p /dev/ttyS5 flash
 The following example shows a possible way to build:
 
 ```bash
+# Set build target
+idf.py set-target esp32
 # Build
 idf.py build
 # Flash
diff --git a/components/DAP/source/DAP.c b/components/DAP/source/DAP.c
index 8feaf7a..a6daaee 100644
--- a/components/DAP/source/DAP.c
+++ b/components/DAP/source/DAP.c
@@ -412,10 +412,16 @@ static uint32_t DAP_SWJ_Clock(const uint8_t *request, uint8_t *response) {
     DAP_Data.fast_clock  = 0U;
     SWD_TransferSpeed = kTransfer_GPIO_normal;
 
-	////FIXME: esp32
-    #define CPU_CLOCK_FIXED 80000000
 
-    delay = ((CPU_CLOCK_FIXED/2U) + (clock - 1U)) / clock;
+#ifdef CONFIG_IDF_TARGET_ESP8266
+  #define BUS_CLOCK_FIXED 80000000
+#elif defined CONFIG_IDF_TARGET_ESP32
+  #define BUS_CLOCK_FIXED 100000000
+#elif defined CONFIG_IDF_TARGET_ESP32C3
+  #define BUS_CLOCK_FIXED 80000000
+#endif
+
+    delay = ((BUS_CLOCK_FIXED/2U) + (clock - 1U)) / clock;
     if (delay > IO_PORT_WRITE_CYCLES) {
       delay -= IO_PORT_WRITE_CYCLES;
       delay  = (delay + (DELAY_SLOW_CYCLES - 1U)) / DELAY_SLOW_CYCLES;