diff --git a/nrf5/hal/hal_twi.c b/nrf5/hal/hal_twi.c
index e318d2021f..d71f29d5a8 100644
--- a/nrf5/hal/hal_twi.c
+++ b/nrf5/hal/hal_twi.c
@@ -35,7 +35,10 @@ static const uint32_t hal_twi_frequency_lookup[] = {
     TWI_FREQUENCY_FREQUENCY_K400, // 400 kbps
 };
 
-void hal_twi_init(NRF_TWI_Type * p_instance, hal_twi_init_t const * p_twi_init) {
+void hal_twi_master_init(NRF_TWI_Type * p_instance, hal_twi_init_t const * p_twi_init) {
+}
+
+void hal_twi_slave_init(NRF_TWI_Type * p_instance, hal_twi_init_t const * p_twi_init) {
 }
 
 #endif // HAL_TWI_MODULE_ENABLED
diff --git a/nrf5/hal/hal_twi.h b/nrf5/hal/hal_twi.h
index 5e2d10c31e..4bc3fc6792 100644
--- a/nrf5/hal/hal_twi.h
+++ b/nrf5/hal/hal_twi.h
@@ -81,8 +81,11 @@ typedef enum {
   */
 typedef struct {
     uint8_t             id;           /* TWI instance id */
+    const pin_obj_t *   scl_pin;      /* TWI SCL pin */
+    const pin_obj_t *   sda_pin;      /* TWI SDA pin */
     hal_twi_role_t      role;         /* TWI master/slave */
     hal_twi_clk_freq_t  freq;         /* TWI frequency */
+    uint32_t            dev_addr;     /* TWI master device address */
 } hal_twi_init_t;
 
 /**
@@ -94,6 +97,9 @@ typedef struct __TWI_HandleTypeDef
     hal_twi_init_t      init;         /* TWI initialization parameters */
 } TWI_HandleTypeDef;
 
-void hal_twi_init(NRF_TWI_Type * p_instance, hal_twi_init_t const * p_twi_init);
+void hal_twi_master_init(NRF_TWI_Type * p_instance, hal_twi_init_t const * p_twi_init);
+
+void hal_twi_slave_init(NRF_TWI_Type * p_instance, hal_twi_init_t const * p_twi_init);
+
 
 #endif // HAL_TWI_H__
diff --git a/nrf5/hal/hal_twie.c b/nrf5/hal/hal_twie.c
index cc20b2c97d..404bb3efbc 100644
--- a/nrf5/hal/hal_twie.c
+++ b/nrf5/hal/hal_twie.c
@@ -39,7 +39,26 @@ static const uint32_t hal_twi_frequency_lookup[] = {
     TWIM_FREQUENCY_FREQUENCY_K400, // 400 kbps
 };
 
-void hal_twi_init(NRF_TWI_Type * p_instance, hal_twi_init_t const * p_twi_init) {
+void hal_twi_master_init(NRF_TWI_Type * p_instance, hal_twi_init_t const * p_twi_init) {
+    // cast to master type
+    NRF_TWIM_Type * twim_instance = (NRF_TWIM_Type *)p_instance;
+
+    twim_instance->PSEL.SCL  = p_twi_init->scl_pin->pin;
+    twim_instance->PSEL.SDA  = p_twi_init->sda_pin->pin;
+
+#if NRF52840_XXAA
+    twim_instance->PSEL.SCL |= (p_twi_init->scl_pin->port << TWIM_PSEL_SCL_PORT_Pos);
+    twim_instance->PSEL.SDA |= (p_twi_init->sda_pin->port << TWIM_PSEL_SDA_PORT_Pos);
+#endif
+    twim_instance->ADDRESS   = p_twi_init->dev_addr;
+    twim_instance->FREQUENCY = hal_twi_frequency_lookup[p_twi_init->freq];
+
+}
+
+void hal_twi_slave_init(NRF_TWI_Type * p_instance, hal_twi_init_t const * p_twi_init) {
+    // cast to slave type
+    NRF_TWIS_Type * twis_instance = (NRF_TWIS_Type *)p_instance;
+    (void)twis_instance;
 }
 
 #endif // HAL_TWIE_MODULE_ENABLED