基于 芯片 nordic 52832 rtt 调试（Mac 电脑）

// <e> NRF_LOG_BACKEND_SERIAL_USES_UART - If enabled data is printed over UART
//==========================================================
#ifndef NRF_LOG_BACKEND_SERIAL_USES_UART
#define NRF_LOG_BACKEND_SERIAL_USES_UART 0 //选择为0
#endif
#if  NRF_LOG_BACKEND_SERIAL_USES_UART
// <o> NRF_LOG_BACKEND_SERIAL_UART_BAUDRATE  - Default Baudrate
 
// <323584=> 1200 baud 
// <643072=> 2400 baud 
// <1290240=> 4800 baud 
// <2576384=> 9600 baud 
// <3862528=> 14400 baud 
// <5152768=> 19200 baud 
// <7716864=> 28800 baud 
// <10289152=> 38400 baud 
// <15400960=> 57600 baud 
// <20615168=> 76800 baud 
// <30801920=> 115200 baud 
// <61865984=> 230400 baud 
// <67108864=> 250000 baud 
// <121634816=> 460800 baud 
// <251658240=> 921600 baud 
// <268435456=> 57600 baud 

#ifndef NRF_LOG_BACKEND_SERIAL_UART_BAUDRATE
#define NRF_LOG_BACKEND_SERIAL_UART_BAUDRATE 30801920
#endif

// <o> NRF_LOG_BACKEND_SERIAL_UART_TX_PIN - UART TX pin 
#ifndef NRF_LOG_BACKEND_SERIAL_UART_TX_PIN
#define NRF_LOG_BACKEND_SERIAL_UART_TX_PIN 6
#endif

// <o> NRF_LOG_BACKEND_SERIAL_UART_RX_PIN - UART RX pin 
#ifndef NRF_LOG_BACKEND_SERIAL_UART_RX_PIN
#define NRF_LOG_BACKEND_SERIAL_UART_RX_PIN 8
#endif

// <o> NRF_LOG_BACKEND_SERIAL_UART_RTS_PIN - UART RTS pin 
#ifndef NRF_LOG_BACKEND_SERIAL_UART_RTS_PIN
#define NRF_LOG_BACKEND_SERIAL_UART_RTS_PIN 5
#endif

// <o> NRF_LOG_BACKEND_SERIAL_UART_CTS_PIN - UART CTS pin 
#ifndef NRF_LOG_BACKEND_SERIAL_UART_CTS_PIN
#define NRF_LOG_BACKEND_SERIAL_UART_CTS_PIN 7
#endif

// <o> NRF_LOG_BACKEND_SERIAL_UART_FLOW_CONTROL  - Hardware Flow Control
 
// <0=> Disabled 
// <1=> Enabled 

#ifndef NRF_LOG_BACKEND_SERIAL_UART_FLOW_CONTROL
#define NRF_LOG_BACKEND_SERIAL_UART_FLOW_CONTROL 0
#endif

// <o> NRF_LOG_BACKEND_UART_INSTANCE  - UART instance used
 
// <0=> 0 

#ifndef NRF_LOG_BACKEND_UART_INSTANCE
#define NRF_LOG_BACKEND_UART_INSTANCE 0
#endif

#endif //NRF_LOG_BACKEND_SERIAL_USES_UART
// </e>

// <e> NRF_LOG_BACKEND_SERIAL_USES_RTT - If enabled data is printed using RTT
//==========================================================
#ifndef NRF_LOG_BACKEND_SERIAL_USES_RTT
#define NRF_LOG_BACKEND_SERIAL_USES_RTT 1 //选择为1
#endif
#if  NRF_LOG_BACKEND_SERIAL_USES_RTT
// <o> NRF_LOG_BACKEND_RTT_OUTPUT_BUFFER_SIZE - RTT output buffer size. 
// <i> Should be equal or bigger than \ref NRF_LOG_BACKEND_MAX_STRING_LENGTH.
// <i> This value is used in Segger RTT configuration to set the buffer size
// <i> if it is bigger than default RTT buffer size.

#ifndef NRF_LOG_BACKEND_RTT_OUTPUT_BUFFER_SIZE
#define NRF_LOG_BACKEND_RTT_OUTPUT_BUFFER_SIZE 512
#endif

#endif //NRF_LOG_BACKEND_SERIAL_USES_RTT
// </e>

// </h> 
//==========================================================

// </h> 
//==========================================================

// <h> nRF_Segger_RTT 

//==========================================================
// <h> segger_rtt - SEGGER RTT

//==========================================================
// <o> SEGGER_RTT_CONFIG_BUFFER_SIZE_UP - Size of upstream buffer. 
#ifndef SEGGER_RTT_CONFIG_BUFFER_SIZE_UP
#define SEGGER_RTT_CONFIG_BUFFER_SIZE_UP 64
#endif

// <o> SEGGER_RTT_CONFIG_MAX_NUM_UP_BUFFERS - Size of upstream buffer. 
#ifndef SEGGER_RTT_CONFIG_MAX_NUM_UP_BUFFERS
#define SEGGER_RTT_CONFIG_MAX_NUM_UP_BUFFERS 2
#endif

// <o> SEGGER_RTT_CONFIG_BUFFER_SIZE_DOWN - Size of upstream buffer. 
#ifndef SEGGER_RTT_CONFIG_BUFFER_SIZE_DOWN
#define SEGGER_RTT_CONFIG_BUFFER_SIZE_DOWN 16
#endif

// <o> SEGGER_RTT_CONFIG_MAX_NUM_DOWN_BUFFERS - Size of upstream buffer. 
#ifndef SEGGER_RTT_CONFIG_MAX_NUM_DOWN_BUFFERS
#define SEGGER_RTT_CONFIG_MAX_NUM_DOWN_BUFFERS 2
#endif

makefile 里面 增加
CFLAGS += -DNRF_LOG_USES_RTT=1#guang add
CFLAGS += -DNRF_LOG_USES_UART=0#guang add

增加头文件
#include "SEGGER_RTT.h"

#define NRF_LOG_MODULE_NAME "MAIN" #include "nrf_log.h" #include "nrf_log_ctrl.h"

测试代码如下：
   SEGGER_RTT_Init();
   SEGGER_RTT_ConfigUpBuffer(0, NULL, NULL, 0, SEGGER_RTT_MODE_BLOCK_IF_FIFO_FULL);
    uint8_t rtt=0;
    while(1){
        xd_delay_ms(1000);
        xd_uart_printf("hello\n");
        NRF_LOG_INFO("UART Start!\r\n");
         rtt++;
        SEGGER_RTT_printf(0, "%d\r\n\r\n",rtt);
      SEGGER_RTT_WriteString(0, "###### Testing SEGGER_printf() ######\r\n");        //xd_uart_printf("\r\n%ds\r\n", i);
       SEGGER_RTT_printf(0, "%sResetting in %d second..%s\n", RTT_CTRL_BG_BRIGHT_RED, 1, RTT_CTRL_RESET);
    }