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/*
* This file is part of the libjaylink project.
*
* Copyright (C) 2015 Marc Schink <jaylink-dev@marcschink.de>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <stdint.h>
#include <stdbool.h>
#include "libjaylink.h"
#include "libjaylink-internal.h"
/**
* @file
*
* Serial Wire Output (SWO) functions.
*/
/** @cond PRIVATE */
#define CMD_SWO 0xeb
#define SWO_CMD_START 0x64
#define SWO_CMD_STOP 0x65
#define SWO_CMD_READ 0x66
#define SWO_CMD_GET_SPEEDS 0x6e
#define SWO_PARAM_MODE 0x01
#define SWO_PARAM_BAUDRATE 0x02
#define SWO_PARAM_READ_SIZE 0x03
#define SWO_PARAM_BUFFER_SIZE 0x04
#define SWO_ERR 0x80000000
/** @endcond */
/**
* Start SWO capture.
*
* @note This function must be used only if the device has the
* #JAYLINK_DEV_CAP_SWO capability.
*
* @param[in,out] devh Device handle.
* @param[in] mode Mode to capture data with.
* @param[in] baudrate Baudrate to capture data in bit per second.
* @param[in] size Device internal buffer size in bytes to use for capturing.
*
* @retval JAYLINK_OK Success.
* @retval JAYLINK_ERR_ARG Invalid arguments.
* @retval JAYLINK_ERR_TIMEOUT A timeout occurred.
* @retval JAYLINK_ERR_IO Input/output error.
* @retval JAYLINK_ERR_DEV Unspecified device error.
* @retval JAYLINK_ERR Other error conditions.
*
* @see jaylink_swo_get_speeds()
* @see jaylink_get_free_memory()
*
* @since 0.1.0
*/
JAYLINK_API int jaylink_swo_start(struct jaylink_device_handle *devh,
enum jaylink_swo_mode mode, uint32_t baudrate, uint32_t size)
{
int ret;
struct jaylink_context *ctx;
uint8_t buf[32];
uint32_t status;
if (!devh || !baudrate || !size)
return JAYLINK_ERR_ARG;
if (mode != JAYLINK_SWO_MODE_UART)
return JAYLINK_ERR_ARG;
ctx = devh->dev->ctx;
ret = transport_start_write_read(devh, 21, 4, true);
if (ret != JAYLINK_OK) {
log_err(ctx, "transport_start_write_read() failed: %s",
jaylink_strerror(ret));
return ret;
}
buf[0] = CMD_SWO;
buf[1] = SWO_CMD_START;
buf[2] = 0x04;
buf[3] = SWO_PARAM_MODE;
buffer_set_u32(buf, mode, 4);
buf[8] = 0x04;
buf[9] = SWO_PARAM_BAUDRATE;
buffer_set_u32(buf, baudrate, 10);
buf[14] = 0x04;
buf[15] = SWO_PARAM_BUFFER_SIZE;
buffer_set_u32(buf, size, 16);
buf[20] = 0x00;
ret = transport_write(devh, buf, 21);
if (ret != JAYLINK_OK) {
log_err(ctx, "transport_write() failed: %s",
jaylink_strerror(ret));
return ret;
}
ret = transport_read(devh, buf, 4);
if (ret != JAYLINK_OK) {
log_err(ctx, "transport_read() failed: %s",
jaylink_strerror(ret));
return ret;
}
status = buffer_get_u32(buf, 0);
if (status > 0) {
log_err(ctx, "Failed to start capture: 0x%x", status);
return JAYLINK_ERR_DEV;
}
return JAYLINK_OK;
}
/**
* Stop SWO capture.
*
* @note This function must be used only if the device has the
* #JAYLINK_DEV_CAP_SWO capability.
*
* @param[in,out] devh Device handle.
*
* @retval JAYLINK_OK Success.
* @retval JAYLINK_ERR_ARG Invalid arguments.
* @retval JAYLINK_ERR_TIMEOUT A timeout occurred.
* @retval JAYLINK_ERR_IO Input/output error.
* @retval JAYLINK_ERR_DEV Unspecified device error.
* @retval JAYLINK_ERR Other error conditions.
*
* @see jaylink_swo_start()
*
* @since 0.1.0
*/
JAYLINK_API int jaylink_swo_stop(struct jaylink_device_handle *devh)
{
int ret;
struct jaylink_context *ctx;
uint8_t buf[4];
uint32_t status;
if (!devh)
return JAYLINK_ERR_ARG;
ctx = devh->dev->ctx;
ret = transport_start_write_read(devh, 3, 4, true);
if (ret != JAYLINK_OK) {
log_err(ctx, "transport_start_write_read() failed: %s",
jaylink_strerror(ret));
return ret;
}
buf[0] = CMD_SWO;
buf[1] = SWO_CMD_STOP;
buf[2] = 0x00;
ret = transport_write(devh, buf, 3);
if (ret != JAYLINK_OK) {
log_err(ctx, "transport_write() failed: %s",
jaylink_strerror(ret));
return ret;
}
ret = transport_read(devh, buf, 4);
if (ret != JAYLINK_OK) {
log_err(ctx, "transport_read() failed: %s",
jaylink_strerror(ret));
return ret;
}
status = buffer_get_u32(buf, 0);
if (status > 0) {
log_err(ctx, "Failed to stop capture: 0x%x", status);
return JAYLINK_ERR_DEV;
}
return JAYLINK_OK;
}
/**
* Read SWO trace data.
*
* @note This function must be used only if the device has the
* #JAYLINK_DEV_CAP_SWO capability.
*
* @param[in,out] devh Device handle.
* @param[out] buffer Buffer to store trace data on success. Its content is
* undefined on failure.
* @param[in,out] length Maximum number of bytes to read. On success, the value
* gets updated with the actual number of bytes read. The
* value is undefined on failure.
*
* @retval JAYLINK_OK Success.
* @retval JAYLINK_ERR_ARG Invalid arguments.
* @retval JAYLINK_ERR_TIMEOUT A timeout occurred.
* @retval JAYLINK_ERR_PROTO Protocol violation.
* @retval JAYLINK_ERR_IO Input/output error.
* @retval JAYLINK_ERR_DEV Unspecified device error.
* @retval JAYLINK_ERR Other error conditions.
*
* @see jaylink_swo_start()
*
* @since 0.1.0
*/
JAYLINK_API int jaylink_swo_read(struct jaylink_device_handle *devh,
uint8_t *buffer, uint32_t *length)
{
int ret;
struct jaylink_context *ctx;
uint8_t buf[32];
uint32_t status;
uint32_t tmp;
if (!devh || !buffer || !length)
return JAYLINK_ERR_ARG;
ctx = devh->dev->ctx;
ret = transport_start_write_read(devh, 9, 8, true);
if (ret != JAYLINK_OK) {
log_err(ctx, "transport_start_write_read() failed: %s",
jaylink_strerror(ret));
return ret;
}
buf[0] = CMD_SWO;
buf[1] = SWO_CMD_READ;
buf[2] = 0x04;
buf[3] = SWO_PARAM_READ_SIZE;
buffer_set_u32(buf, *length, 4);
buf[8] = 0x00;
ret = transport_write(devh, buf, 9);
if (ret != JAYLINK_OK) {
log_err(ctx, "transport_write() failed: %s",
jaylink_strerror(ret));
return ret;
}
ret = transport_read(devh, buf, 8);
if (ret != JAYLINK_OK) {
log_err(ctx, "transport_read() failed: %s",
jaylink_strerror(ret));
return ret;
}
status = buffer_get_u32(buf, 0);
tmp = buffer_get_u32(buf, 4);
if (tmp > *length) {
log_err(ctx, "Received %u bytes but only %u bytes were "
"requested", tmp, *length);
return JAYLINK_ERR_PROTO;
}
*length = tmp;
if (tmp > 0) {
ret = transport_start_read(devh, tmp);
if (ret != JAYLINK_OK) {
log_err(ctx, "transport_start_read() failed: %s",
jaylink_strerror(ret));
return ret;
}
ret = transport_read(devh, buffer, tmp);
if (ret != JAYLINK_OK) {
log_err(ctx, "transport_read() failed: %s",
jaylink_strerror(ret));
return ret;
}
}
if (status > 0) {
log_err(ctx, "Failed to read data: 0x%x", status);
return JAYLINK_ERR_DEV;
}
return JAYLINK_OK;
}
/**
* Retrieve SWO speeds.
* The speeds are calculated as follows:
*
* @par
* <tt>speeds = @a freq / n</tt> with <tt>n >= @a min_div</tt> and
* <tt>n <= @a max_div</tt>, where @p n is an integer
*
* Assuming, for example, a base frequency @a freq of 4500 kHz, a minimum
* divider @a min_div of 1 and a maximum divider @a max_div of 8 then the
* highest possible SWO speed is 4500 kHz / 1 = 4500 kHz. The next highest
* speed is 2250 kHz for a divider of 2, and so on. Accordingly, the lowest
* possible speed is 4500 kHz / 8 = 562.5 kHz.
*
* @note This function must be used only if the device has the
* #JAYLINK_DEV_CAP_SWO capability.
*
* @param[in,out] devh Device handle.
* @param[in] mode Capture mode to retrieve speeds for.
* @param[out] speed Speed information on success, and undefined on failure.
*
* @retval JAYLINK_OK Success.
* @retval JAYLINK_ERR_ARG Invalid arguments.
* @retval JAYLINK_ERR_TIMEOUT A timeout occurred.
* @retval JAYLINK_ERR_PROTO Protocol violation.
* @retval JAYLINK_ERR_IO Input/output error.
* @retval JAYLINK_ERR_DEV Unspecified device error.
* @retval JAYLINK_ERR Other error conditions.
*
* @since 0.1.0
*/
JAYLINK_API int jaylink_swo_get_speeds(struct jaylink_device_handle *devh,
enum jaylink_swo_mode mode, struct jaylink_swo_speed *speed)
{
int ret;
struct jaylink_context *ctx;
uint8_t buf[24];
uint32_t tmp;
uint32_t length;
if (!devh || !speed)
return JAYLINK_ERR_ARG;
if (mode != JAYLINK_SWO_MODE_UART)
return JAYLINK_ERR_ARG;
ctx = devh->dev->ctx;
ret = transport_start_write_read(devh, 9, 4, true);
if (ret != JAYLINK_OK) {
log_err(ctx, "transport_start_write_read() failed: %s",
jaylink_strerror(ret));
return ret;
}
buf[0] = CMD_SWO;
buf[1] = SWO_CMD_GET_SPEEDS;
buf[2] = 0x04;
buf[3] = SWO_PARAM_MODE;
buffer_set_u32(buf, mode, 4);
buf[8] = 0x00;
ret = transport_write(devh, buf, 9);
if (ret != JAYLINK_OK) {
log_err(ctx, "transport_write() failed: %s",
jaylink_strerror(ret));
return ret;
}
ret = transport_read(devh, buf, 4);
if (ret != JAYLINK_OK) {
log_err(ctx, "transport_read() failed: %s",
jaylink_strerror(ret));
return ret;
}
tmp = buffer_get_u32(buf, 0);
if (tmp & SWO_ERR) {
log_err(ctx, "Failed to retrieve speed information: 0x%x",
tmp);
return JAYLINK_ERR_DEV;
}
length = tmp;
if (length != 28) {
log_err(ctx, "Unexpected number of bytes received: %u",
length);
return JAYLINK_ERR_PROTO;
}
length = length - 4;
ret = transport_start_read(devh, length);
if (ret != JAYLINK_OK) {
log_err(ctx, "transport_start_read() failed: %s",
jaylink_strerror(ret));
return ret;
}
ret = transport_read(devh, buf, length);
if (ret != JAYLINK_OK) {
log_err(ctx, "transport_read() failed: %s",
jaylink_strerror(ret));
return ret;
}
speed->freq = buffer_get_u32(buf, 4);
speed->min_div = buffer_get_u32(buf, 8);
if (!speed->min_div) {
log_err(ctx, "Minimum frequency divider is zero");
return JAYLINK_ERR_PROTO;
}
speed->max_div = buffer_get_u32(buf, 12);
if (speed->max_div < speed->min_div) {
log_err(ctx, "Maximum frequency divider is less than minimum "
"frequency divider");
return JAYLINK_ERR_PROTO;
}
speed->min_prescaler = buffer_get_u32(buf, 16);
speed->max_prescaler = buffer_get_u32(buf, 20);
if (speed->max_prescaler < speed->min_prescaler) {
log_err(ctx, "Maximum prescaler is less than minimum "
"prescaler");
return JAYLINK_ERR_PROTO;
}
return JAYLINK_OK;
}
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