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/*
* This file is part of the libjaylink project.
*
* Copyright (C) 2014-2015 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 Debug (SWD) functions.
*/
/** @cond PRIVATE */
#define CMD_SWD_IO 0xcf
/**
* Error code indicating that there is not enough free memory on the device to
* perform the SWD I/O operation.
*/
#define SWD_IO_ERR_NO_MEMORY 0x06
/** @endcond */
/**
* Perform a SWD I/O operation.
*
* @note This function must only be used if the #JAYLINK_TIF_SWD interface is
* available and selected.
*
* @param[in,out] devh Device handle.
* @param[in] direction Buffer to read the transfer direction from.
* @param[in] out Buffer to read host-to-target data from.
* @param[out] in Buffer to store target-to-host data on success. Its content
* is undefined on failure. The buffer must be large enough to
* contain at least the specified number of bits to transfer.
* @param[in] length Total number of bits to transfer from host to target and
* vice versa.
*
* @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_NO_MEMORY Not enough memory on the device to perform
* the operation.
* @retval JAYLINK_ERR_DEV Unspecified device error.
* @retval JAYLINK_ERR Other error conditions.
*
* @see jaylink_select_interface()
* @see jaylink_set_speed()
*
* @since 0.1.0
*/
JAYLINK_API int jaylink_swd_io(struct jaylink_device_handle *devh,
const uint8_t *direction, const uint8_t *out, uint8_t *in,
uint16_t length)
{
int ret;
struct jaylink_context *ctx;
uint16_t num_bytes;
uint8_t buf[4];
uint8_t status;
if (!devh || !direction || !out || !in || !length)
return JAYLINK_ERR_ARG;
ctx = devh->dev->ctx;
num_bytes = (length + 7) / 8;
ret = transport_start_write_read(devh, 4 + 2 * num_bytes,
num_bytes + 1, true);
if (ret != JAYLINK_OK) {
log_err(ctx, "transport_start_write_read() failed: %s.",
jaylink_strerror(ret));
return ret;
}
buf[0] = CMD_SWD_IO;
buf[1] = 0x00;
buffer_set_u16(buf, length, 2);
ret = transport_write(devh, buf, 4);
if (ret != JAYLINK_OK) {
log_err(ctx, "transport_write() failed: %s.",
jaylink_strerror(ret));
return ret;
}
ret = transport_write(devh, direction, num_bytes);
if (ret != JAYLINK_OK) {
log_err(ctx, "transport_write() failed: %s.",
jaylink_strerror(ret));
return ret;
}
ret = transport_write(devh, out, num_bytes);
if (ret != JAYLINK_OK) {
log_err(ctx, "transport_write() failed: %s.",
jaylink_strerror(ret));
return ret;
}
ret = transport_read(devh, in, num_bytes);
if (ret != JAYLINK_OK) {
log_err(ctx, "transport_read() failed: %s.",
jaylink_strerror(ret));
return ret;
}
ret = transport_read(devh, &status, 1);
if (ret != JAYLINK_OK) {
log_err(ctx, "transport_read() failed: %s.",
jaylink_strerror(ret));
return ret;
}
if (status == SWD_IO_ERR_NO_MEMORY) {
return JAYLINK_ERR_DEV_NO_MEMORY;
} else if (status > 0) {
log_err(ctx, "SWD I/O operation failed: 0x%x.", status);
return JAYLINK_ERR_DEV;
}
return JAYLINK_OK;
}
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