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rt-thread-official/bsp/ck802/libraries/common/crc/ck_crc.c

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/*
* Copyright (C) 2017 C-SKY Microsystems Co., Ltd. All rights reserved.
*
* 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.
*/
/******************************************************************************
* @file ck_crc.c
* @brief CSI Source File for CRC Driver
* @version V1.0
* @date 02. June 2017
******************************************************************************/
#include <stdio.h>
#include "drv_crc.h"
#include "ck_crc.h"
#define ERR_CRC(errno) (CSI_DRV_ERRNO_CRC_BASE | errno)
#define CRC_NULL_PARAM_CHK(para) \
do { \
if (para == NULL) { \
return ERR_CRC(EDRV_PARAMETER); \
} \
} while (0)
typedef struct {
uint32_t base;
crc_event_cb_t cb;
crc_status_t status;
} ck_crc_priv_t;
static ck_crc_priv_t crc_handle[CONFIG_CRC_NUM];
/* Driver Capabilities */
static const crc_capabilities_t driver_capabilities = {
.ROHC = 1, /* ROHC mode */
.MAXIM = 1, /* MAXIM mode */
.X25 = 1, /* X25 mode */
.CCITT = 1, /* CCITT mode */
.USB = 1, /* USB mode */
.IBM = 1, /* IBM mode */
.MODBUS = 1 /* MODBUS mode */
};
//
// Functions
//
static ck_crc_reg_t *crc_reg = NULL;
static int32_t crc_set_mode(crc_mode_e mode, crc_standard_crc_e standard)
{
if (mode == CRC_MODE_CRC16) {
switch (standard) {
case CRC_STANDARD_CRC_MODBUS:
crc_reg->CRC_SEL = 0x0;
crc_reg->CRC_INIT = 0xffff;
break;
case CRC_STANDARD_CRC_IBM:
crc_reg->CRC_SEL = 0x0;
crc_reg->CRC_INIT = 0x0;
break;
case CRC_STANDARD_CRC_MAXIM:
crc_reg->CRC_SEL = 0x4;
crc_reg->CRC_INIT = 0x0;
break;
case CRC_STANDARD_CRC_USB:
crc_reg->CRC_SEL = 0x4;
crc_reg->CRC_INIT = 0xffff;
break;
case CRC_STANDARD_CRC_CCITT:
crc_reg->CRC_SEL = 0x1;
crc_reg->CRC_INIT = 0x0;
break;
case CRC_STANDARD_CRC_X25:
crc_reg->CRC_SEL = 0x5;
crc_reg->CRC_INIT = 0xffff;
break;
default:
return ERR_CRC(EDRV_PARAMETER);
}
} else if (mode == CRC_MODE_CRC8) {
switch (standard) {
case CRC_STANDARD_CRC_MAXIM:
crc_reg->CRC_SEL = 0x2;
crc_reg->CRC_INIT = 0x0;
break;
case CRC_STANDARD_CRC_ROHC:
crc_reg->CRC_SEL = 0x3;
crc_reg->CRC_INIT = 0xff;
break;
default:
return ERR_CRC(EDRV_PARAMETER);
}
} else {
return ERR_CRC(EDRV_PARAMETER);
}
return 0;
}
static int32_t crc_set_data(uint32_t data)
{
crc_reg->CRC_DATA = data;
return 0;
}
static int32_t crc_get_data(uint32_t *data)
{
*data = crc_reg->CRC_DATA;
return 0;
}
int32_t __attribute__((weak)) target_get_crc_count(void)
{
return 0;
}
int32_t __attribute__((weak)) target_get_crc(int32_t idx, uint32_t *base)
{
return NULL;
}
/**
\brief get crc handle count.
\return crc handle count
*/
int32_t csi_crc_get_instance_count(void)
{
return target_get_crc_count();
}
/**
\brief Initialize CRC Interface. 1. Initializes the resources needed for the CRC interface 2.registers event callback function
\param[in] idx must not exceed return value of csi_crc_get_handle_count()
\param[in] cb_event Pointer to \ref crc_event_cb_t
\return return crc handle if success
*/
crc_handle_t csi_crc_initialize(int32_t idx, crc_event_cb_t cb_event)
{
if (idx < 0 || idx >= CONFIG_CRC_NUM) {
return NULL;
}
/* obtain the crc information */
uint32_t base = 0u;
int32_t real_idx = target_get_crc(idx, &base);
if (real_idx != idx) {
return NULL;
}
ck_crc_priv_t *crc_priv = &crc_handle[idx];
crc_reg = (ck_crc_reg_t *)(crc_priv->base);
crc_priv->base = base;
crc_priv->cb = cb_event;
crc_priv->status.busy = 0;
return (crc_handle_t)crc_priv;
}
/**
\brief De-initialize CRC Interface. stops operation and releases the software resources used by the interface
\param[in] handle crc handle to operate.
\return error code
*/
int32_t csi_crc_uninitialize(crc_handle_t handle)
{
CRC_NULL_PARAM_CHK(handle);
ck_crc_priv_t *crc_priv = handle;
crc_priv->cb = NULL;
return 0;
}
/**
\brief Get driver capabilities.
\param[in] handle crc handle to operate.
\return \ref crc_capabilities_t
*/
crc_capabilities_t csi_crc_get_capabilities(crc_handle_t handle)
{
return driver_capabilities;
}
/**
\brief config crc mode.
\param[in] handle crc handle to operate.
\param[in] mode \ref crc_mode_e
\param[in] standard \ref crc_standard_crc_e
\return error code
*/
int32_t csi_crc_config(crc_handle_t handle, crc_mode_e mode, crc_standard_crc_e standard)
{
CRC_NULL_PARAM_CHK(handle);
/* set the crc mode */
uint32_t ret = crc_set_mode(mode, standard);
return ret;
}
/**
\brief calculate crc.
\param[in] handle crc handle to operate.
\param[in] in Pointer to the input data
\param[out] out Pointer to the result.
\param[in] len intpu data len.
\return error code
*/
int32_t csi_crc_calculate(crc_handle_t handle, const void *in, void *out, uint32_t len)
{
CRC_NULL_PARAM_CHK(handle);
CRC_NULL_PARAM_CHK(in);
CRC_NULL_PARAM_CHK(out);
if (len <= 0) {
return ERR_CRC(EDRV_PARAMETER);
}
ck_crc_priv_t *crc_priv = handle;
crc_reg = (ck_crc_reg_t *)(crc_priv->base);
crc_priv->status.busy = 1;
/* put the data int the register */
uint8_t cur;
uint8_t *p = (uint8_t *)in;
for (cur=0; cur<len - 3; cur += 4, p+=4) {
crc_set_data(p[0]
| (p[1] << 8)
| (p[2] << 16)
| (p[3] << 24));
}
uint32_t data = 0;
uint8_t i;
if (cur < len) {
for (i=0; i<len-cur; i++) {
data |= (p[cur + i] << (i*8));
}
crc_set_data(data);
}
crc_get_data((uint32_t *)out);
crc_priv->status.busy = 0;
return 0;
}
/**
\brief Get CRC status.
\param[in] handle crc handle to operate.
\return CRC status \ref crc_status_t
*/
crc_status_t csi_crc_get_status(crc_handle_t handle)
{
ck_crc_priv_t *crc_priv = handle;
return crc_priv->status;
}
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