diff --git a/libraries/mbed/targets/hal/TARGET_Silicon_Labs/TARGET_EFM32/pwmout_api.c b/libraries/mbed/targets/hal/TARGET_Silicon_Labs/TARGET_EFM32/pwmout_api.c
index ae0f981a16..f956f57533 100644
--- a/libraries/mbed/targets/hal/TARGET_Silicon_Labs/TARGET_EFM32/pwmout_api.c
+++ b/libraries/mbed/targets/hal/TARGET_Silicon_Labs/TARGET_EFM32/pwmout_api.c
@@ -139,7 +139,7 @@ void pwmout_write(pwmout_t *obj, float value)
         value = 1;
     }
 
-    float pulse_period_in_s = obj->period_cycles / (float) pwm_clockfreq;
+    float pulse_period_in_s = obj->period_cycles / ((float) (pwm_clockfreq >> pwm_prescaler_div));
     pwmout_pulsewidth(obj, value * pulse_period_in_s);
 }
 
@@ -192,7 +192,7 @@ void pwmout_period_us(pwmout_t *obj, int us)
 
 void pwmout_pulsewidth(pwmout_t *obj, float seconds)
 {
-    obj->width_cycles = pwm_clockfreq * seconds;
+    obj->width_cycles = (uint32_t) (((float) (pwm_clockfreq >> pwm_prescaler_div)) * seconds);
     TIMER_CompareBufSet(PWM_TIMER, obj->channel, obj->width_cycles);
 }
 
diff --git a/libraries/tests/mbed/digitalin_digitalout/main.cpp b/libraries/tests/mbed/digitalin_digitalout/main.cpp
index 68cca82a98..31082c2319 100644
--- a/libraries/tests/mbed/digitalin_digitalout/main.cpp
+++ b/libraries/tests/mbed/digitalin_digitalout/main.cpp
@@ -46,6 +46,18 @@ DigitalIn in(TP4);
 DigitalOut out(P1_0);
 DigitalIn in(P4_7);
 
+#elif defined(TARGET_EFM32LG_STK3600) || defined(TARGET_EFM32GG_STK3700) || defined(TARGET_EFM32WG_STK3800)
+DigitalOut out(PD0);
+DigitalIn  in(PC3);
+
+#elif defined(TARGET_EFM32ZG_STK3200)
+DigitalOut out(PD7);
+DigitalIn  in(PC1);
+
+#elif defined(TARGET_EFM32HG_STK3400)
+DigitalOut out(PE10);
+DigitalIn  in(PC1);
+
 #else
 DigitalOut out(p5);
 DigitalIn in(p25);
diff --git a/libraries/tests/mbed/digitalinout/main.cpp b/libraries/tests/mbed/digitalinout/main.cpp
index 5efaa5cbef..3137a11f41 100644
--- a/libraries/tests/mbed/digitalinout/main.cpp
+++ b/libraries/tests/mbed/digitalinout/main.cpp
@@ -46,6 +46,18 @@ DigitalInOut d2(TP4);
 DigitalInOut d1(P1_0);
 DigitalInOut d2(P4_7);
 
+#elif defined(TARGET_EFM32LG_STK3600) || defined(TARGET_EFM32GG_STK3700) || defined(TARGET_EFM32WG_STK3800)
+DigitalInOut d1(PD0);
+DigitalInOut d2(PC3);
+
+#elif defined(TARGET_EFM32ZG_STK3200)
+DigitalInOut d1(PD7);
+DigitalInOut d2(PC1);
+
+#elif defined(TARGET_EFM32HG_STK3400)
+DigitalInOut d1(PE10);
+DigitalInOut d2(PC1);
+
 #else
 DigitalInOut d1(p5);
 DigitalInOut d2(p25);
diff --git a/libraries/tests/mbed/i2c_master/main.cpp b/libraries/tests/mbed/i2c_master/main.cpp
index 392be3218c..a2f462217b 100644
--- a/libraries/tests/mbed/i2c_master/main.cpp
+++ b/libraries/tests/mbed/i2c_master/main.cpp
@@ -10,6 +10,18 @@ I2C i2c(PTE0, PTE1);
 I2C i2c(p22,p20);
 #elif defined(TARGET_FF_ARDUINO) || defined(TARGET_MAXWSNENV)
 I2C i2c(I2C_SDA, I2C_SCL);
+#elif defined(TARGET_EFM32LG_STK3600) || defined(TARGET_EFM32GG_STK3700) || defined(TARGET_EFM32WG_STK3800)
+#define TEST_SDA_PIN PD6
+#define TEST_SCL_PIN PD7
+I2C i2c(TEST_SDA_PIN, TEST_SCL_PIN);
+#elif defined(TARGET_EFM32ZG_STK3200)
+#define TEST_SDA_PIN PE12
+#define TEST_SCL_PIN PE13
+I2C i2c(TEST_SDA_PIN, TEST_SCL_PIN);
+#elif defined(TARGET_EFM32HG_STK3400)
+#define TEST_SDA_PIN PD6
+#define TEST_SCL_PIN PD7
+I2C i2c(TEST_SDA_PIN, TEST_SCL_PIN);
 #else
 I2C i2c(p28, p27);
 #endif
diff --git a/libraries/tests/mbed/interruptin/main.cpp b/libraries/tests/mbed/interruptin/main.cpp
index 578277beec..14b287d8cb 100644
--- a/libraries/tests/mbed/interruptin/main.cpp
+++ b/libraries/tests/mbed/interruptin/main.cpp
@@ -75,6 +75,18 @@ void in_handler() {
 #define PIN_OUT    P1_0
 #define PIN_IN     P4_7
 
+#elif defined(TARGET_EFM32LG_STK3600) || defined(TARGET_EFM32GG_STK3700) || defined(TARGET_EFM32WG_STK3800)
+#define PIN_OUT    PD0
+#define PIN_IN     PC3
+
+#elif defined(TARGET_EFM32ZG_STK3200)
+#define PIN_OUT    PD7
+#define PIN_IN     PC1
+
+#elif defined(TARGET_EFM32HG_STK3400)
+#define PIN_OUT    PE10
+#define PIN_IN     PC1
+
 #else
 #define PIN_IN      (p5)
 #define PIN_OUT     (p25)
diff --git a/libraries/tests/mbed/portinout/main.cpp b/libraries/tests/mbed/portinout/main.cpp
index 22f2c66b3b..dbd9dcc7c0 100644
--- a/libraries/tests/mbed/portinout/main.cpp
+++ b/libraries/tests/mbed/portinout/main.cpp
@@ -101,6 +101,34 @@
 #define P2_1    (1 << 8)  // PB_8
 #define P2_2    (1 << 9)  // PB_9
 #define PORT_2  PortB
+
+#elif defined(TARGET_EFM32LG_STK3600) || defined(TARGET_EFM32GG_STK3700) || defined(TARGET_EFM32WG_STK3800)
+#define P1_1    (1 << 0)  // PD0
+#define P1_2    (1 << 1)  // PD1
+#define PORT_1  PortD
+
+#define P2_1    (1 << 3)  // PC3
+#define P2_2    (1 << 4)  // PC4
+#define PORT_2  PortC
+
+#elif defined(TARGET_EFM32ZG_STK3200)
+#define P1_1    (1 << 7)  // PD7
+#define P1_2    (1 << 6)  // PD6
+#define PORT_1  PortD
+
+#define P2_1    (1 << 1)  // PC1
+#define P2_2    (1 << 2)  // PC2
+#define PORT_2  PortC
+
+#elif defined(TARGET_EFM32HG_STK3400)
+#define P1_1    (1 << 10)  // PE10
+#define P1_2    (1 << 11)  // PE11
+#define PORT_1  PortE
+
+#define P2_1    (1 << 1)  // PC1
+#define P2_2    (1 << 2)  // PC2
+#define PORT_2  PortC
+
 #endif
 
 #define MASK_1   (P1_1 | P1_2)
diff --git a/libraries/tests/mbed/portout_portin/main.cpp b/libraries/tests/mbed/portout_portin/main.cpp
index 6fb02990e6..aa44bb09ae 100644
--- a/libraries/tests/mbed/portout_portin/main.cpp
+++ b/libraries/tests/mbed/portout_portin/main.cpp
@@ -101,6 +101,34 @@
 #define P2_1    (1 << 8)  // PB_8
 #define P2_2    (1 << 9)  // PB_9
 #define PORT_2  PortB
+
+#elif defined(TARGET_EFM32LG_STK3600) || defined(TARGET_EFM32GG_STK3700) || defined(TARGET_EFM32WG_STK3800)
+#define P1_1    (1 << 0)  // PD0
+#define P1_2    (1 << 1)  // PD1
+#define PORT_1  PortD
+
+#define P2_1    (1 << 3)  // PC3
+#define P2_2    (1 << 4)  // PC4
+#define PORT_2  PortC
+
+#elif defined(TARGET_EFM32ZG_STK3200)
+#define P1_1    (1 << 7)  // PD7
+#define P1_2    (1 << 6)  // PD6
+#define PORT_1  PortD
+
+#define P2_1    (1 << 1)  // PC1
+#define P2_2    (1 << 2)  // PC2
+#define PORT_2  PortC
+
+#elif defined(TARGET_EFM32HG_STK3400)
+#define P1_1    (1 << 10)  // PE10
+#define P1_2    (1 << 11)  // PE11
+#define PORT_1  PortE
+
+#define P2_1    (1 << 1)  // PC1
+#define P2_2    (1 << 2)  // PC2
+#define PORT_2  PortC
+
 #endif
 
 #define MASK_1   (P1_1 | P1_2)
diff --git a/libraries/tests/mbed/spi_master/main.cpp b/libraries/tests/mbed/spi_master/main.cpp
index 9392072438..b5cb5442e5 100644
--- a/libraries/tests/mbed/spi_master/main.cpp
+++ b/libraries/tests/mbed/spi_master/main.cpp
@@ -13,6 +13,15 @@ DigitalOut cs(PTA13);
 #elif defined(TARGET_FF_ARDUINO)
 SPI spi(D11, D12, D13);   // mosi, miso, sclk
 DigitalOut cs(D10);
+#elif defined(TARGET_EFM32LG_STK3600) || defined(TARGET_EFM32GG_STK3700) || defined(TARGET_EFM32WG_STK3800)
+SPI spi(PD0, PD1, PD2);   // mosi, miso, sclk
+DigitalOut cs(PD3);
+#elif defined(TARGET_EFM32ZG_STK3200)
+SPI spi(PD7, PD6, PC15);   // mosi, miso, sclk
+DigitalOut cs(PC14);
+#elif defined(TARGET_EFM32HG_STK3400)
+SPI spi(PE10, PE11, PE12);   // mosi, miso, sclk
+DigitalOut cs(PE13);
 #else
 SPI spi(p5, p6, p7); // mosi, miso, sclk
 DigitalOut cs(p8);
diff --git a/libraries/tests/utest/i2c_eeprom_asynch/i2c_eeprom_asynch.cpp b/libraries/tests/utest/i2c_eeprom_asynch/i2c_eeprom_asynch.cpp
index a188abc207..0034acd0a7 100644
--- a/libraries/tests/utest/i2c_eeprom_asynch/i2c_eeprom_asynch.cpp
+++ b/libraries/tests/utest/i2c_eeprom_asynch/i2c_eeprom_asynch.cpp
@@ -27,6 +27,19 @@
 #if defined(TARGET_K64F)
 #define TEST_SDA_PIN PTE25
 #define TEST_SCL_PIN PTE24
+
+#elif defined(TARGET_EFM32LG_STK3600) || defined(TARGET_EFM32GG_STK3700) || defined(TARGET_EFM32WG_STK3800)
+#define TEST_SDA_PIN PD6
+#define TEST_SCL_PIN PD7
+
+#elif defined(TARGET_EFM32ZG_STK3200)
+#define TEST_SDA_PIN PE12
+#define TEST_SCL_PIN PE13
+
+#elif defined(TARGET_EFM32HG_STK3400)
+#define TEST_SDA_PIN PD6
+#define TEST_SCL_PIN PD7
+
 #else
 #error Target not supported
 #endif
diff --git a/libraries/tests/utest/serial_asynch/serial_asynch.cpp b/libraries/tests/utest/serial_asynch/serial_asynch.cpp
index 44169e194c..9d55c7d4b4 100644
--- a/libraries/tests/utest/serial_asynch/serial_asynch.cpp
+++ b/libraries/tests/utest/serial_asynch/serial_asynch.cpp
@@ -28,6 +28,17 @@
 #define TEST_SERIAL_ONE_TX_PIN PTC17 // uart3
 #define TEST_SERIAL_TWO_RX_PIN PTD2  // uart2
 
+#elif defined(TARGET_EFM32LG_STK3600) || defined(TARGET_EFM32GG_STK3700) || defined(TARGET_EFM32WG_STK3800)
+#define TEST_SERIAL_ONE_TX_PIN PD0   // usart1
+#define TEST_SERIAL_TWO_RX_PIN PC3   // usart2
+
+#elif defined(TARGET_EFM32ZG_STK3200)
+#error "Target not supported (only 2 serial ports available, need 3)"
+
+#elif defined(TARGET_EFM32HG_STK3400)
+#define TEST_SERIAL_ONE_TX_PIN PE10 // usart0
+#define TEST_SERIAL_TWO_RX_PIN PC1  // usart1
+
 #else
 
 #error Target not supported
diff --git a/libraries/tests/utest/spi_asynch/spi_master_asynch.cpp b/libraries/tests/utest/spi_asynch/spi_master_asynch.cpp
index 0a0a42702a..68b85c4ebb 100644
--- a/libraries/tests/utest/spi_asynch/spi_master_asynch.cpp
+++ b/libraries/tests/utest/spi_asynch/spi_master_asynch.cpp
@@ -39,6 +39,25 @@
 #define TEST_MISO_PIN PTD3
 #define TEST_SCLK_PIN PTD1
 #define TEST_CS_PIN   PTD0
+
+#elif defined(TARGET_EFM32LG_STK3600) || defined(TARGET_EFM32GG_STK3700) || defined(TARGET_EFM32WG_STK3800)
+#define TEST_MOSI_PIN PD0
+#define TEST_MISO_PIN PD1
+#define TEST_SCLK_PIN PD2
+#define TEST_CS_PIN   PD3
+
+#elif defined(TARGET_EFM32ZG_STK3200)
+#define TEST_MOSI_PIN PD7
+#define TEST_MISO_PIN PD6
+#define TEST_SCLK_PIN PC15
+#define TEST_CS_PIN   PC14
+
+#elif defined(TARGET_EFM32HG_STK3400)
+#define TEST_MOSI_PIN PE10
+#define TEST_MISO_PIN PE11
+#define TEST_SCLK_PIN PE12
+#define TEST_CS_PIN   PE13
+
 #else
 #error Target not supported
 #endif