基于 芯片 nordic 52832 rtt 调试（Mac 电脑）

1. 代码配置

2. // <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);
       }

3. 工具查看   使用 jlinkExe 命令行来进入命令行，来进行配置连接方式，通信速率。使用jlinkRttClient来观察log。
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6. jlinkRTTClient 工具使用方法
7. 打开JlinkRTTClient 即可打出log