diff --git a/ports/nrf/boards/wt51822_s4at/mpconfigboard.h b/ports/nrf/boards/wt51822_s4at/mpconfigboard.h
index 568a6b6568..d5fe13e3ec 100644
--- a/ports/nrf/boards/wt51822_s4at/mpconfigboard.h
+++ b/ports/nrf/boards/wt51822_s4at/mpconfigboard.h
@@ -41,12 +41,12 @@
 #define MICROPY_HW_HAS_LED          (0)
 
 // UART config
-#define MICROPY_HW_UART1_RX         (pin_P1)
-#define MICROPY_HW_UART1_TX         (pin_P2)
+#define MICROPY_HW_UART1_RX         (1)
+#define MICROPY_HW_UART1_TX         (2)
 #define MICROPY_HW_UART1_HWFC       (0)
 
 // SPI0 config
 #define MICROPY_HW_SPI0_NAME        "SPI0"
-#define MICROPY_HW_SPI0_SCK         (pin_P9)
-#define MICROPY_HW_SPI0_MOSI        (pin_P10)
-#define MICROPY_HW_SPI0_MISO        (pin_P13)
+#define MICROPY_HW_SPI0_SCK         (9)
+#define MICROPY_HW_SPI0_MOSI        (10)
+#define MICROPY_HW_SPI0_MISO        (13)
diff --git a/ports/nrf/boards/wt51822_s4at/nrf51_hal_conf.h b/ports/nrf/boards/wt51822_s4at/nrf51_hal_conf.h
deleted file mode 100644
index 79af193468..0000000000
--- a/ports/nrf/boards/wt51822_s4at/nrf51_hal_conf.h
+++ /dev/null
@@ -1,14 +0,0 @@
-#ifndef NRF51_HAL_CONF_H__
-#define NRF51_HAL_CONF_H__
-
-#define HAL_UART_MODULE_ENABLED
-#define HAL_SPI_MODULE_ENABLED
-#define HAL_TIME_MODULE_ENABLED
-#define HAL_RTC_MODULE_ENABLED
-#define HAL_TIMER_MODULE_ENABLED
-#define HAL_TWI_MODULE_ENABLED
-#define HAL_ADC_MODULE_ENABLED
-#define HAL_TEMP_MODULE_ENABLED
-#define HAL_RNG_MODULE_ENABLED
-
-#endif // NRF51_HAL_CONF_H__