// Copyright 2017 Espressif Systems (Shanghai) PTE LTD
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "string.h"
#include "freertos/FreeRTOS.h"
#include "SEGGER_RTT.h"
#include "SEGGER_SYSVIEW.h"
#include "SEGGER_SYSVIEW_Conf.h"
#if CONFIG_IDF_TARGET_ESP32
#include "esp32/rom/ets_sys.h"
#elif CONFIG_IDF_TARGET_ESP32S2
#include "esp32s2/rom/ets_sys.h"
#endif
#include "esp_app_trace.h"
#include "esp_log.h"
const static char *TAG = "segger_rtt";
#define SYSVIEW_EVENTS_BUF_SZ 255U
// size of down channel data buf
#define SYSVIEW_DOWN_BUF_SIZE 32
#define SEGGER_STOP_WAIT_TMO 1000000 //us
#if CONFIG_SYSVIEW_BUF_WAIT_TMO == -1
#define SEGGER_HOST_WAIT_TMO ESP_APPTRACE_TMO_INFINITE
#else
#define SEGGER_HOST_WAIT_TMO CONFIG_SYSVIEW_BUF_WAIT_TMO
#endif
static uint8_t s_events_buf[SYSVIEW_EVENTS_BUF_SZ];
static uint16_t s_events_buf_filled;
static uint8_t s_down_buf[SYSVIEW_DOWN_BUF_SIZE];
/*********************************************************************
*
* Public code
*
**********************************************************************
*/
/*********************************************************************
*
* SEGGER_RTT_ESP32_FlushNoLock()
*
* Function description
* Flushes buffered events.
*
* Parameters
* min_sz Threshold for flushing data. If current filling level is above this value, data will be flushed. TRAX destinations only.
* tmo Timeout for operation (in us). Use ESP_APPTRACE_TMO_INFINITE to wait indefinetly.
*
* Return value
* None.
*/
void SEGGER_RTT_ESP32_FlushNoLock(unsigned long min_sz, unsigned long tmo)
{
esp_err_t res;
if (s_events_buf_filled > 0) {
res = esp_apptrace_write(ESP_APPTRACE_DEST_TRAX, s_events_buf, s_events_buf_filled, tmo);
if (res != ESP_OK) {
ESP_LOGE(TAG, "Failed to flush buffered events (%d)!\n", res);
}
}
// flush even if we failed to write buffered events, because no new events will be sent after STOP
res = esp_apptrace_flush_nolock(ESP_APPTRACE_DEST_TRAX, min_sz, tmo);
if (res != ESP_OK) {
ESP_LOGE(TAG, "Failed to flush apptrace data (%d)!\n", res);
}
s_events_buf_filled = 0;
}
/*********************************************************************
*
* SEGGER_RTT_ESP32_Flush()
*
* Function description
* Flushes buffered events.
*
* Parameters
* min_sz Threshold for flushing data. If current filling level is above this value, data will be flushed. TRAX destinations only.
* tmo Timeout for operation (in us). Use ESP_APPTRACE_TMO_INFINITE to wait indefinetly.
*
* Return value
* None.
*/
void SEGGER_RTT_ESP32_Flush(unsigned long min_sz, unsigned long tmo)
{
SEGGER_SYSVIEW_LOCK();
SEGGER_RTT_ESP32_FlushNoLock(min_sz, tmo);
SEGGER_SYSVIEW_UNLOCK();
}
/*********************************************************************
*
* SEGGER_RTT_ReadNoLock()
*
* Function description
* Reads characters from SEGGER real-time-terminal control block
* which have been previously stored by the host.
* Do not lock against interrupts and multiple access.
*
* Parameters
* BufferIndex Index of Down-buffer to be used (e.g. 0 for "Terminal").
* pBuffer Pointer to buffer provided by target application, to copy characters from RTT-down-buffer to.
* BufferSize Size of the target application buffer.
*
* Return value
* Number of bytes that have been read.
*/
unsigned SEGGER_RTT_ReadNoLock(unsigned BufferIndex, void* pData, unsigned BufferSize) {
uint32_t size = BufferSize;
esp_err_t res = esp_apptrace_read(ESP_APPTRACE_DEST_TRAX, pData, &size, 0);
if (res != ESP_OK) {
return 0;
}
return size;
}
/*********************************************************************
*
* SEGGER_RTT_WriteSkipNoLock
*
* Function description
* Stores a specified number of characters in SEGGER RTT
* control block which is then read by the host.
* SEGGER_RTT_WriteSkipNoLock does not lock the application and
* skips all data, if the data does not fit into the buffer.
*
* Parameters
* BufferIndex Index of "Up"-buffer to be used (e.g. 0 for "Terminal").
* pBuffer Pointer to character array. Does not need to point to a \0 terminated string.
* NumBytes Number of bytes to be stored in the SEGGER RTT control block.
*
* Return value
* Number of bytes which have been stored in the "Up"-buffer.
*
* Notes
* (1) If there is not enough space in the "Up"-buffer, all data is dropped.
* (2) For performance reasons this function does not call Init()
* and may only be called after RTT has been initialized.
* Either by calling SEGGER_RTT_Init() or calling another RTT API function first.
*/
unsigned SEGGER_RTT_WriteSkipNoLock(unsigned BufferIndex, const void* pBuffer, unsigned NumBytes) {
uint8_t *pbuf = (uint8_t *)pBuffer;
uint8_t event_id = *pbuf;
if (NumBytes > SYSVIEW_EVENTS_BUF_SZ) {
ESP_LOGE(TAG, "Too large event %u bytes!", NumBytes);
return 0;
}
if (xPortGetCoreID()) { // dual core specific code
// use the highest - 1 bit of event ID to indicate core ID
// the highest bit can not be used due to event ID encoding method
// this reduces supported ID range to [0..63] (for 1 byte IDs) plus [128..16383] (for 2 bytes IDs)
if (*pbuf & 0x80) { // 2 bytes ID
*(pbuf + 1) |= (1 << 6);
} else if (NumBytes != 10 || *pbuf != 0) { // ignore sync sequence
*pbuf |= (1 << 6);
}
}
if (s_events_buf_filled + NumBytes > SYSVIEW_EVENTS_BUF_SZ) {
esp_err_t res = esp_apptrace_write(ESP_APPTRACE_DEST_TRAX, s_events_buf, s_events_buf_filled, SEGGER_HOST_WAIT_TMO);
if (res != ESP_OK) {
return 0; // skip current data buffer only, accumulated events are kept
}
s_events_buf_filled = 0;
}
memcpy(&s_events_buf[s_events_buf_filled], pBuffer, NumBytes);
s_events_buf_filled += NumBytes;
if (event_id == SYSVIEW_EVTID_TRACE_STOP) {
SEGGER_RTT_ESP32_FlushNoLock(0, SEGGER_STOP_WAIT_TMO);
}
return NumBytes;
}
/*********************************************************************
*
* SEGGER_RTT_ConfigUpBuffer
*
* Function description
* Run-time configuration of a specific up-buffer (T->H).
* Buffer to be configured is specified by index.
* This includes: Buffer address, size, name, flags, ...
*
* Parameters
* BufferIndex Index of the buffer to configure.
* sName Pointer to a constant name string.
* pBuffer Pointer to a buffer to be used.
* BufferSize Size of the buffer.
* Flags Operating modes. Define behavior if buffer is full (not enough space for entire message).
*
* Return value
* >= 0 - O.K.
* < 0 - Error
*
* Additional information
* Buffer 0 is configured on compile-time.
* May only be called once per buffer.
* Buffer name and flags can be reconfigured using the appropriate functions.
*/
int SEGGER_RTT_ConfigUpBuffer(unsigned BufferIndex, const char* sName, void* pBuffer, unsigned BufferSize, unsigned Flags) {
s_events_buf_filled = 0;
return 0;
}
/*********************************************************************
*
* SEGGER_RTT_ConfigDownBuffer
*
* Function description
* Run-time configuration of a specific down-buffer (H->T).
* Buffer to be configured is specified by index.
* This includes: Buffer address, size, name, flags, ...
*
* Parameters
* BufferIndex Index of the buffer to configure.
* sName Pointer to a constant name string.
* pBuffer Pointer to a buffer to be used.
* BufferSize Size of the buffer.
* Flags Operating modes. Define behavior if buffer is full (not enough space for entire message).
*
* Return value
* >= 0 O.K.
* < 0 Error
*
* Additional information
* Buffer 0 is configured on compile-time.
* May only be called once per buffer.
* Buffer name and flags can be reconfigured using the appropriate functions.
*/
int SEGGER_RTT_ConfigDownBuffer(unsigned BufferIndex, const char* sName, void* pBuffer, unsigned BufferSize, unsigned Flags) {
esp_apptrace_down_buffer_config(s_down_buf, sizeof(s_down_buf));
return 0;
}
/*************************** End of file ****************************/