Systemview Continuous Recording over UART

Question

Im trying to implement Continuous Recording for systemview over UART on an STM32F103. my application is using FreeRTOS v11. I am able to successfully get data in snapshot mode and view it in systemview. I tried implementing continuous mode using uart by adding the following code to SEGGER_SYSVIEW_Config_UART.h

void BSP_UART_Init(uint32_t uart_port, uint32_t baudrate) {
  static uint8_t rxByte = 0;
  static uint8_t txByte = 0;

  // Assign the pointers to these local static bytes
  recieveData = &rxByte;
  transmitData = &txByte;

  if (uart_port == 0) {
    MX_USART2_UART_Init(baudrate);
    HAL_UART_Receive_IT(&huart2, (uint8_t *)recieveData, 1);
  }
}

/*********************************************************************
*
*       HAL_UART_TxCpltCallback
*/
void HAL_UART_TxCpltCallback(UART_HandleTypeDef *huart) {
  (void)huart;
  _SysView_OnTxComplete(_SYSVIEW_UART_PORT);
}

/*********************************************************************
*
*       HAL_UART_RxCpltCallback
*/
void HAL_UART_RxCpltCallback(UART_HandleTypeDef *huart) {
  (void)huart;
  _SysView_OnRxComplete(_SYSVIEW_UART_PORT, *recieveData);
}

The recording starts but stops in between. I've attached a screenshot below showing the behavior

I've set SEGGER_SYSVIEW_RTT_BUFFER_SIZE to 20KB

Where does Segger come into this? Are you using Segger Studio (which is actually a thin wrapper around Rowley Crossworks)? This looks like the so-called "HAL" by ST to me. — Lundin
– Lundin, Commented Oct 22 at 9:11
Im Using STM32_Cube_IDE with FreeRTOS. The only thing that is SEGGER's is Systemview — Zain Noman
– Zain Noman, Commented Oct 22 at 11:18

Zain Noman · Accepted Answer · 2025-10-22 11:23:05Z

0

I got it working eventually. The issue was that once the events buffer became empty, the uart just stopped transmitting data. In the file SEGGER_SYSVIEW_Conf.h I added the macro for SEGGER_SYSVIEW_ON_EVENT_RECORDED . Here's my final file

#ifndef SEGGER_SYSVIEW_CONF_H
#define SEGGER_SYSVIEW_CONF_H

#if !(defined SEGGER_SYSVIEW_SECTION) && (defined SEGGER_RTT_BUFFER_SECTION)
  #define SEGGER_SYSVIEW_SECTION                  SEGGER_RTT_BUFFER_SECTION
#endif


#define SEGGER_SYSVIEW_USE_INTERNAL_RECORDER 1

#define SEGGER_SYSVIEW_CORE 2

#define SEGGER_SYSVIEW_RTT_BUFFER_SIZE (1024*20)

void SEGGER_SYSVIEW_X_OnEventRecorded(unsigned NumBytes);

#define SEGGER_SYSVIEW_ON_EVENT_RECORDED(NumBytes) SEGGER_SYSVIEW_X_OnEventRecorded(NumBytes)

answered Oct 22 at 11:23

Zain Noman

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