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DAPLink (CMSIS-DAP) porting to Artery AT32F425, WCH CH32V203 and WCH CH32V305.
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DAPLink/DAP/Source/SWO.c

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/*
* Copyright (c) 2013-2021 ARM Limited. All rights reserved.
*
* SPDX-License-Identifier: Apache-2.0
*
* 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
*
* 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.
*
* ----------------------------------------------------------------------
*
* $Date: 29. March 2021
* $Revision: V2.0.1
*
* Project: CMSIS-DAP Source
* Title: SWO.c CMSIS-DAP SWO I/O
*
*---------------------------------------------------------------------------*/
#include "DAP_config.h"
#include "DAP.h"
#if (SWO_UART != 0)
#include "Driver_USART.h"
#endif
#if (SWO_STREAM != 0)
#include "cmsis_os2.h"
#define osObjectsExternal
#include "osObjects.h"
#endif
#if (SWO_STREAM != 0)
#ifdef DAP_FW_V1
#error "SWO Streaming Trace not supported in DAP V1!"
#endif
#endif
#if (SWO_UART != 0)
// USART Driver
#define _USART_Driver_(n) Driver_USART##n
#define USART_Driver_(n) _USART_Driver_(n)
extern ARM_DRIVER_USART USART_Driver_(SWO_UART_DRIVER);
#define pUSART (&USART_Driver_(SWO_UART_DRIVER))
static uint8_t USART_Ready = 0U;
#endif /* (SWO_UART != 0) */
#if ((SWO_UART != 0) || (SWO_MANCHESTER != 0))
#define SWO_STREAM_TIMEOUT 50U /* Stream timeout in ms */
#define USB_BLOCK_SIZE 512U /* USB Block Size */
#define TRACE_BLOCK_SIZE 64U /* Trace Block Size (2^n: 32...512) */
// Trace State
static uint8_t TraceTransport = 0U; /* Trace Transport */
static uint8_t TraceMode = 0U; /* Trace Mode */
static uint8_t TraceStatus = 0U; /* Trace Status without Errors */
static uint8_t TraceError[2] = {0U, 0U}; /* Trace Error flags (banked) */
static uint8_t TraceError_n = 0U; /* Active Trace Error bank */
// Trace Buffer
static uint8_t TraceBuf[SWO_BUFFER_SIZE]; /* Trace Buffer (must be 2^n) */
static volatile uint32_t TraceIndexI = 0U; /* Incoming Trace Index */
static volatile uint32_t TraceIndexO = 0U; /* Outgoing Trace Index */
static volatile uint8_t TraceUpdate; /* Trace Update Flag */
static uint32_t TraceBlockSize; /* Current Trace Block Size */
#if (TIMESTAMP_CLOCK != 0U)
// Trace Timestamp
static volatile struct {
uint32_t index;
uint32_t tick;
} TraceTimestamp;
#endif
// Trace Helper functions
static void ClearTrace (void);
static void ResumeTrace (void);
static uint32_t GetTraceCount (void);
static uint8_t GetTraceStatus (void);
static void SetTraceError (uint8_t flag);
#if (SWO_STREAM != 0)
extern osThreadId_t SWO_ThreadId;
static volatile uint8_t TransferBusy = 0U; /* Transfer Busy Flag */
static uint32_t TransferSize; /* Current Transfer Size */
#endif
#if (SWO_UART != 0)
// USART Driver Callback function
// event: event mask
static void USART_Callback (uint32_t event) {
uint32_t index_i;
uint32_t index_o;
uint32_t count;
uint32_t num;
if (event & ARM_USART_EVENT_RECEIVE_COMPLETE) {
#if (TIMESTAMP_CLOCK != 0U)
TraceTimestamp.tick = TIMESTAMP_GET();
#endif
index_o = TraceIndexO;
index_i = TraceIndexI;
index_i += TraceBlockSize;
TraceIndexI = index_i;
#if (TIMESTAMP_CLOCK != 0U)
TraceTimestamp.index = index_i;
#endif
num = TRACE_BLOCK_SIZE - (index_i & (TRACE_BLOCK_SIZE - 1U));
count = index_i - index_o;
if (count <= (SWO_BUFFER_SIZE - num)) {
index_i &= SWO_BUFFER_SIZE - 1U;
TraceBlockSize = num;
pUSART->Receive(&TraceBuf[index_i], num);
} else {
TraceStatus = DAP_SWO_CAPTURE_ACTIVE | DAP_SWO_CAPTURE_PAUSED;
}
TraceUpdate = 1U;
#if (SWO_STREAM != 0)
if (TraceTransport == 2U) {
if (count >= (USB_BLOCK_SIZE - (index_o & (USB_BLOCK_SIZE - 1U)))) {
osThreadFlagsSet(SWO_ThreadId, 1U);
}
}
#endif
}
if (event & ARM_USART_EVENT_RX_OVERFLOW) {
SetTraceError(DAP_SWO_BUFFER_OVERRUN);
}
if (event & (ARM_USART_EVENT_RX_BREAK |
ARM_USART_EVENT_RX_FRAMING_ERROR |
ARM_USART_EVENT_RX_PARITY_ERROR)) {
SetTraceError(DAP_SWO_STREAM_ERROR);
}
}
// Enable or disable SWO Mode (UART)
// enable: enable flag
// return: 1 - Success, 0 - Error
__WEAK uint32_t SWO_Mode_UART (uint32_t enable) {
int32_t status;
USART_Ready = 0U;
if (enable != 0U) {
status = pUSART->Initialize(USART_Callback);
if (status != ARM_DRIVER_OK) {
return (0U);
}
status = pUSART->PowerControl(ARM_POWER_FULL);
if (status != ARM_DRIVER_OK) {
pUSART->Uninitialize();
return (0U);
}
} else {
pUSART->Control(ARM_USART_CONTROL_RX, 0U);
pUSART->Control(ARM_USART_ABORT_RECEIVE, 0U);
pUSART->PowerControl(ARM_POWER_OFF);
pUSART->Uninitialize();
}
return (1U);
}
// Configure SWO Baudrate (UART)
// baudrate: requested baudrate
// return: actual baudrate or 0 when not configured
__WEAK uint32_t SWO_Baudrate_UART (uint32_t baudrate) {
int32_t status;
uint32_t index;
uint32_t num;
if (baudrate > SWO_UART_MAX_BAUDRATE) {
baudrate = SWO_UART_MAX_BAUDRATE;
}
if (TraceStatus & DAP_SWO_CAPTURE_ACTIVE) {
pUSART->Control(ARM_USART_CONTROL_RX, 0U);
if (pUSART->GetStatus().rx_busy) {
TraceIndexI += pUSART->GetRxCount();
pUSART->Control(ARM_USART_ABORT_RECEIVE, 0U);
}
}
status = pUSART->Control(ARM_USART_MODE_ASYNCHRONOUS |
ARM_USART_DATA_BITS_8 |
ARM_USART_PARITY_NONE |
ARM_USART_STOP_BITS_1,
baudrate);
if (status == ARM_DRIVER_OK) {
USART_Ready = 1U;
} else {
USART_Ready = 0U;
return (0U);
}
if (TraceStatus & DAP_SWO_CAPTURE_ACTIVE) {
if ((TraceStatus & DAP_SWO_CAPTURE_PAUSED) == 0U) {
index = TraceIndexI & (SWO_BUFFER_SIZE - 1U);
num = TRACE_BLOCK_SIZE - (index & (TRACE_BLOCK_SIZE - 1U));
TraceBlockSize = num;
pUSART->Receive(&TraceBuf[index], num);
}
pUSART->Control(ARM_USART_CONTROL_RX, 1U);
}
return (baudrate);
}
// Control SWO Capture (UART)
// active: active flag
// return: 1 - Success, 0 - Error
__WEAK uint32_t SWO_Control_UART (uint32_t active) {
int32_t status;
if (active) {
if (!USART_Ready) {
return (0U);
}
TraceBlockSize = 1U;
status = pUSART->Receive(&TraceBuf[0], 1U);
if (status != ARM_DRIVER_OK) {
return (0U);
}
status = pUSART->Control(ARM_USART_CONTROL_RX, 1U);
if (status != ARM_DRIVER_OK) {
return (0U);
}
} else {
pUSART->Control(ARM_USART_CONTROL_RX, 0U);
if (pUSART->GetStatus().rx_busy) {
TraceIndexI += pUSART->GetRxCount();
pUSART->Control(ARM_USART_ABORT_RECEIVE, 0U);
}
}
return (1U);
}
// Start SWO Capture (UART)
// buf: pointer to buffer for capturing
// num: number of bytes to capture
__WEAK void SWO_Capture_UART (uint8_t *buf, uint32_t num) {
TraceBlockSize = num;
pUSART->Receive(buf, num);
}
// Get SWO Pending Trace Count (UART)
// return: number of pending trace data bytes
__WEAK uint32_t SWO_GetCount_UART (void) {
uint32_t count;
if (pUSART->GetStatus().rx_busy) {
count = pUSART->GetRxCount();
} else {
count = 0U;
}
return (count);
}
#endif /* (SWO_UART != 0) */
#if (SWO_MANCHESTER != 0)
// Enable or disable SWO Mode (Manchester)
// enable: enable flag
// return: 1 - Success, 0 - Error
__WEAK uint32_t SWO_Mode_Manchester (uint32_t enable) {
return (0U);
}
// Configure SWO Baudrate (Manchester)
// baudrate: requested baudrate
// return: actual baudrate or 0 when not configured
__WEAK uint32_t SWO_Baudrate_Manchester (uint32_t baudrate) {
return (0U);
}
// Control SWO Capture (Manchester)
// active: active flag
// return: 1 - Success, 0 - Error
__WEAK uint32_t SWO_Control_Manchester (uint32_t active) {
return (0U);
}
// Start SWO Capture (Manchester)
// buf: pointer to buffer for capturing
// num: number of bytes to capture
__WEAK void SWO_Capture_Manchester (uint8_t *buf, uint32_t num) {
}
// Get SWO Pending Trace Count (Manchester)
// return: number of pending trace data bytes
__WEAK uint32_t SWO_GetCount_Manchester (void) {
}
#endif /* (SWO_MANCHESTER != 0) */
// Clear Trace Errors and Data
static void ClearTrace (void) {
#if (SWO_STREAM != 0)
if (TraceTransport == 2U) {
if (TransferBusy != 0U) {
SWO_AbortTransfer();
TransferBusy = 0U;
}
}
#endif
TraceError[0] = 0U;
TraceError[1] = 0U;
TraceError_n = 0U;
TraceIndexI = 0U;
TraceIndexO = 0U;
#if (TIMESTAMP_CLOCK != 0U)
TraceTimestamp.index = 0U;
TraceTimestamp.tick = 0U;
#endif
}
// Resume Trace Capture
static void ResumeTrace (void) {
uint32_t index_i;
uint32_t index_o;
if (TraceStatus == (DAP_SWO_CAPTURE_ACTIVE | DAP_SWO_CAPTURE_PAUSED)) {
index_i = TraceIndexI;
index_o = TraceIndexO;
if ((index_i - index_o) < SWO_BUFFER_SIZE) {
index_i &= SWO_BUFFER_SIZE - 1U;
switch (TraceMode) {
#if (SWO_UART != 0)
case DAP_SWO_UART:
TraceStatus = DAP_SWO_CAPTURE_ACTIVE;
SWO_Capture_UART(&TraceBuf[index_i], 1U);
break;
#endif
#if (SWO_MANCHESTER != 0)
case DAP_SWO_MANCHESTER:
TraceStatus = DAP_SWO_CAPTURE_ACTIVE;
SWO_Capture_Manchester(&TraceBuf[index_i], 1U);
break;
#endif
default:
break;
}
}
}
}
// Get Trace Count
// return: number of available data bytes in trace buffer
static uint32_t GetTraceCount (void) {
uint32_t count;
if (TraceStatus == DAP_SWO_CAPTURE_ACTIVE) {
do {
TraceUpdate = 0U;
count = TraceIndexI - TraceIndexO;
switch (TraceMode) {
#if (SWO_UART != 0)
case DAP_SWO_UART:
count += SWO_GetCount_UART();
break;
#endif
#if (SWO_MANCHESTER != 0)
case DAP_SWO_MANCHESTER:
count += SWO_GetCount_Manchester();
break;
#endif
default:
break;
}
} while (TraceUpdate != 0U);
} else {
count = TraceIndexI - TraceIndexO;
}
return (count);
}
// Get Trace Status (clear Error flags)
// return: Trace Status (Active flag and Error flags)
static uint8_t GetTraceStatus (void) {
uint8_t status;
uint32_t n;
n = TraceError_n;
TraceError_n ^= 1U;
status = TraceStatus | TraceError[n];
TraceError[n] = 0U;
return (status);
}
// Set Trace Error flag(s)
// flag: error flag(s) to set
static void SetTraceError (uint8_t flag) {
TraceError[TraceError_n] |= flag;
}
// Process SWO Transport command and prepare response
// request: pointer to request data
// response: pointer to response data
// return: number of bytes in response (lower 16 bits)
// number of bytes in request (upper 16 bits)
uint32_t SWO_Transport (const uint8_t *request, uint8_t *response) {
uint8_t transport;
uint32_t result;
if ((TraceStatus & DAP_SWO_CAPTURE_ACTIVE) == 0U) {
transport = *request;
switch (transport) {
case 0U:
case 1U:
#if (SWO_STREAM != 0)
case 2U:
#endif
TraceTransport = transport;
result = 1U;
break;
default:
result = 0U;
break;
}
} else {
result = 0U;
}
if (result != 0U) {
*response = DAP_OK;
} else {
*response = DAP_ERROR;
}
return ((1U << 16) | 1U);
}
// Process SWO Mode command and prepare response
// request: pointer to request data
// response: pointer to response data
// return: number of bytes in response (lower 16 bits)
// number of bytes in request (upper 16 bits)
uint32_t SWO_Mode (const uint8_t *request, uint8_t *response) {
uint8_t mode;
uint32_t result;
mode = *request;
switch (TraceMode) {
#if (SWO_UART != 0)
case DAP_SWO_UART:
SWO_Mode_UART(0U);
break;
#endif
#if (SWO_MANCHESTER != 0)
case DAP_SWO_MANCHESTER:
SWO_Mode_Manchester(0U);
break;
#endif
default:
break;
}
switch (mode) {
case DAP_SWO_OFF:
result = 1U;
break;
#if (SWO_UART != 0)
case DAP_SWO_UART:
result = SWO_Mode_UART(1U);
break;
#endif
#if (SWO_MANCHESTER != 0)
case DAP_SWO_MANCHESTER:
result = SWO_Mode_Manchester(1U);
break;
#endif
default:
result = 0U;
break;
}
if (result != 0U) {
TraceMode = mode;
} else {
TraceMode = DAP_SWO_OFF;
}
TraceStatus = 0U;
if (result != 0U) {
*response = DAP_OK;
} else {
*response = DAP_ERROR;
}
return ((1U << 16) | 1U);
}
// Process SWO Baudrate command and prepare response
// request: pointer to request data
// response: pointer to response data
// return: number of bytes in response (lower 16 bits)
// number of bytes in request (upper 16 bits)
uint32_t SWO_Baudrate (const uint8_t *request, uint8_t *response) {
uint32_t baudrate;
baudrate = (uint32_t)(*(request+0) << 0) |
(uint32_t)(*(request+1) << 8) |
(uint32_t)(*(request+2) << 16) |
(uint32_t)(*(request+3) << 24);
switch (TraceMode) {
#if (SWO_UART != 0)
case DAP_SWO_UART:
baudrate = SWO_Baudrate_UART(baudrate);
break;
#endif
#if (SWO_MANCHESTER != 0)
case DAP_SWO_MANCHESTER:
baudrate = SWO_Baudrate_Manchester(baudrate);
break;
#endif
default:
baudrate = 0U;
break;
}
if (baudrate == 0U) {
TraceStatus = 0U;
}
*response++ = (uint8_t)(baudrate >> 0);
*response++ = (uint8_t)(baudrate >> 8);
*response++ = (uint8_t)(baudrate >> 16);
*response = (uint8_t)(baudrate >> 24);
return ((4U << 16) | 4U);
}
// Process SWO Control command and prepare response
// request: pointer to request data
// response: pointer to response data
// return: number of bytes in response (lower 16 bits)
// number of bytes in request (upper 16 bits)
uint32_t SWO_Control (const uint8_t *request, uint8_t *response) {
uint8_t active;
uint32_t result;
active = *request & DAP_SWO_CAPTURE_ACTIVE;
if (active != (TraceStatus & DAP_SWO_CAPTURE_ACTIVE)) {
if (active) {
ClearTrace();
}
switch (TraceMode) {
#if (SWO_UART != 0)
case DAP_SWO_UART:
result = SWO_Control_UART(active);
break;
#endif
#if (SWO_MANCHESTER != 0)
case DAP_SWO_MANCHESTER:
result = SWO_Control_Manchester(active);
break;
#endif
default:
result = 0U;
break;
}
if (result != 0U) {
TraceStatus = active;
#if (SWO_STREAM != 0)
if (TraceTransport == 2U) {
osThreadFlagsSet(SWO_ThreadId, 1U);
}
#endif
}
} else {
result = 1U;
}
if (result != 0U) {
*response = DAP_OK;
} else {
*response = DAP_ERROR;
}
return ((1U << 16) | 1U);
}
// Process SWO Status command and prepare response
// response: pointer to response data
// return: number of bytes in response
uint32_t SWO_Status (uint8_t *response) {
uint8_t status;
uint32_t count;
status = GetTraceStatus();
count = GetTraceCount();
*response++ = status;
*response++ = (uint8_t)(count >> 0);
*response++ = (uint8_t)(count >> 8);
*response++ = (uint8_t)(count >> 16);
*response = (uint8_t)(count >> 24);
return (5U);
}
// Process SWO Extended Status command and prepare response
// request: pointer to request data
// response: pointer to response data
// return: number of bytes in response (lower 16 bits)
// number of bytes in request (upper 16 bits)
uint32_t SWO_ExtendedStatus (const uint8_t *request, uint8_t *response) {
uint8_t cmd;
uint8_t status;
uint32_t count;
#if (TIMESTAMP_CLOCK != 0U)
uint32_t index;
uint32_t tick;
#endif
uint32_t num;
num = 0U;
cmd = *request;
if (cmd & 0x01U) {
status = GetTraceStatus();
*response++ = status;
num += 1U;
}
if (cmd & 0x02U) {
count = GetTraceCount();
*response++ = (uint8_t)(count >> 0);
*response++ = (uint8_t)(count >> 8);
*response++ = (uint8_t)(count >> 16);
*response++ = (uint8_t)(count >> 24);
num += 4U;
}
#if (TIMESTAMP_CLOCK != 0U)
if (cmd & 0x04U) {
do {
TraceUpdate = 0U;
index = TraceTimestamp.index;
tick = TraceTimestamp.tick;
} while (TraceUpdate != 0U);
*response++ = (uint8_t)(index >> 0);
*response++ = (uint8_t)(index >> 8);
*response++ = (uint8_t)(index >> 16);
*response++ = (uint8_t)(index >> 24);
*response++ = (uint8_t)(tick >> 0);
*response++ = (uint8_t)(tick >> 8);
*response++ = (uint8_t)(tick >> 16);
*response++ = (uint8_t)(tick >> 24);
num += 4U;
}
#endif
return ((1U << 16) | num);
}
// Process SWO Data command and prepare response
// request: pointer to request data
// response: pointer to response data
// return: number of bytes in response (lower 16 bits)
// number of bytes in request (upper 16 bits)
uint32_t SWO_Data (const uint8_t *request, uint8_t *response) {
uint8_t status;
uint32_t count;
uint32_t index;
uint32_t n, i;
status = GetTraceStatus();
count = GetTraceCount();
if (TraceTransport == 1U) {
n = (uint32_t)(*(request+0) << 0) |
(uint32_t)(*(request+1) << 8);
if (n > (DAP_PACKET_SIZE - 4U)) {
n = DAP_PACKET_SIZE - 4U;
}
if (count > n) {
count = n;
}
} else {
count = 0U;
}
*response++ = status;
*response++ = (uint8_t)(count >> 0);
*response++ = (uint8_t)(count >> 8);
if (TraceTransport == 1U) {
index = TraceIndexO;
for (i = index, n = count; n; n--) {
i &= SWO_BUFFER_SIZE - 1U;
*response++ = TraceBuf[i++];
}
TraceIndexO = index + count;
ResumeTrace();
}
return ((2U << 16) | (3U + count));
}
#if (SWO_STREAM != 0)
// SWO Data Transfer complete callback
void SWO_TransferComplete (void) {
TraceIndexO += TransferSize;
TransferBusy = 0U;
ResumeTrace();
osThreadFlagsSet(SWO_ThreadId, 1U);
}
// SWO Thread
__NO_RETURN void SWO_Thread (void *argument) {
uint32_t timeout;
uint32_t flags;
uint32_t count;
uint32_t index;
uint32_t i, n;
(void) argument;
timeout = osWaitForever;
for (;;) {
flags = osThreadFlagsWait(1U, osFlagsWaitAny, timeout);
if (TraceStatus & DAP_SWO_CAPTURE_ACTIVE) {
timeout = SWO_STREAM_TIMEOUT;
} else {
timeout = osWaitForever;
flags = osFlagsErrorTimeout;
}
if (TransferBusy == 0U) {
count = GetTraceCount();
if (count != 0U) {
index = TraceIndexO & (SWO_BUFFER_SIZE - 1U);
n = SWO_BUFFER_SIZE - index;
if (count > n) {
count = n;
}
if (flags != osFlagsErrorTimeout) {
i = index & (USB_BLOCK_SIZE - 1U);
if (i == 0U) {
count &= ~(USB_BLOCK_SIZE - 1U);
} else {
n = USB_BLOCK_SIZE - i;
if (count >= n) {
count = n;
} else {
count = 0U;
}
}
}
if (count != 0U) {
TransferSize = count;
TransferBusy = 1U;
SWO_QueueTransfer(&TraceBuf[index], count);
}
}
}
}
}
#endif /* (SWO_STREAM != 0) */
#endif /* ((SWO_UART != 0) || (SWO_MANCHESTER != 0)) */