cmsis_uart: use CMSIS UART driver for nrf52820

Author: mbrossard

records/hic_hal/nrf52820.yaml

@@ -22,6 +22,7 @@ common:
             - source/hic_hal/nordic/nrf52820
             - source/hic_hal/nordic/nrf52820/cmsis
             - source/hic_hal/nordic/nrf52820/nrfx/drivers
+            - source/hic_hal/cmsis-driver/uart
 
 tool_specific:
     uvision:

source/hic_hal/nordic/nrf52820/IO_Config.h

@@ -85,6 +85,12 @@ extern uint32_t i2c_sda_pin;
 #define UART_TX_PIN       uart_tx_pin
 #define UART_RX_PIN       uart_rx_pin
 
+// cmsis-driver/uart/uart.c configuration
+#include "Driver_USART.h"
+extern ARM_DRIVER_USART Driver_USART0;
+#define CMSIS_UART_INSTANCE (Driver_USART0)
+#define CMSIS_UART_IRQ      (UARTE0_UART0_IRQn)
+
 // I2C
 #define I2C_SCL_PIN       i2c_scl_pin
 #define I2C_SDA_PIN       i2c_sda_pin