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rt-thread-official/bsp/nxp/mcx/mcxn/Libraries/drivers/drv_can.c

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/*
* Copyright (c) 2006-2024, RT-Thread Development Team
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author Notes
* 2023-03-24 YangXi the first version.
*/
#include <rtdevice.h>
#ifdef RT_USING_CAN
#include "fsl_common.h"
#include "fsl_flexcan.h"
#define TX_MB_IDX (6)
#define RX_MB_COUNT (1)
static flexcan_frame_t frame[RX_MB_COUNT]; /* one frame buffer per RX MB */
static rt_uint32_t filter_mask = 0;
enum
{
#ifdef BSP_USING_CAN0
CAN0_INDEX,
#endif
#ifdef BSP_USING_CAN1
CAN1_INDEX,
#endif
};
struct imxrt_can
{
char *name;
CAN_Type *base;
IRQn_Type irqn;
uint32_t instance;
clock_div_name_t clock_div_name;
clock_attach_id_t clock_attach_id;
flexcan_handle_t handle;
struct rt_can_device can_dev;
};
struct imxrt_can flexcans[] =
{
#ifdef BSP_USING_CAN0
{
.name = "can0",
.base = CAN0,
.instance = 0,
.irqn = CAN0_IRQn,
.clock_div_name = kCLOCK_DivFlexcan0Clk,
.clock_attach_id = kFRO_HF_to_FLEXCAN0,
},
#endif
#ifdef BSP_USING_CAN1
{
.name = "can1",
.base = CAN1,
.instance = 1,
.irqn = CAN1_IRQn,
.clock_div_name = kCLOCK_DivFlexcan1Clk,
.clock_attach_id = kFRO_HF_to_FLEXCAN1,
},
#endif
};
static void flexcan_callback(CAN_Type *base, flexcan_handle_t *handle, status_t status, uint64_t result, void *userData)
{
struct imxrt_can *can;
flexcan_mb_transfer_t rxXfer;
can = (struct imxrt_can *)userData;
switch (status)
{
case kStatus_FLEXCAN_RxIdle:
rt_hw_can_isr(&can->can_dev, RT_CAN_EVENT_RX_IND | result << 8);
rxXfer.frame = &frame[result - 1];
rxXfer.mbIdx = result;
FLEXCAN_TransferReceiveNonBlocking(can->base, &can->handle, &rxXfer);
break;
case kStatus_FLEXCAN_TxIdle:
rt_hw_can_isr(&can->can_dev, RT_CAN_EVENT_TX_DONE | result << 8);
break;
default:
break;
}
}
static rt_err_t can_cfg(struct rt_can_device *can_dev, struct can_configure *cfg)
{
struct imxrt_can *can = (struct imxrt_can *)can_dev->parent.user_data;
flexcan_config_t config;
rt_uint32_t res = RT_EOK;
flexcan_rx_mb_config_t mbConfig;
flexcan_mb_transfer_t rxXfer;
rt_uint8_t i, mailbox;
FLEXCAN_GetDefaultConfig(&config);
config.baudRate = cfg->baud_rate;
config.enableIndividMask = true; /* one filter per MB */
config.disableSelfReception = true;
switch (cfg->mode)
{
case RT_CAN_MODE_NORMAL:
/* default mode */
break;
case RT_CAN_MODE_LISTEN:
break;
case RT_CAN_MODE_LOOPBACK:
config.enableLoopBack = true;
break;
case RT_CAN_MODE_LOOPBACKANLISTEN:
break;
}
flexcan_timing_config_t timing_config;
rt_memset(&timing_config, 0, sizeof(flexcan_timing_config_t));
if(FLEXCAN_CalculateImprovedTimingValues(can->base, config.baudRate, CLOCK_GetFlexcanClkFreq(can->instance), &timing_config))
{
/* Update the improved timing configuration*/
rt_memcpy(&(config.timingConfig), &timing_config, sizeof(flexcan_timing_config_t));
}
else
{
//rt_kprintf("No found Improved Timing Configuration. Just used default configuration\n");
}
FLEXCAN_Init(can->base, &config, CLOCK_GetFlexcanClkFreq(can->instance));
FLEXCAN_TransferCreateHandle(can->base, &can->handle, flexcan_callback, can);
/* init RX_MB_COUNT RX MB to default status */
mbConfig.format = kFLEXCAN_FrameFormatStandard; /* standard ID */
mbConfig.type = kFLEXCAN_FrameTypeData; /* data frame */
mbConfig.id = FLEXCAN_ID_STD(0); /* default ID is 0 */
for (i = 0; i < RX_MB_COUNT; i++)
{
/* the used MB index from 1 to RX_MB_COUNT */
mailbox = i + 1;
/* all ID bit in the filter is "don't care" */
FLEXCAN_SetRxIndividualMask(can->base, mailbox, FLEXCAN_RX_MB_STD_MASK(0, 0, 0));
FLEXCAN_SetRxMbConfig(can->base, mailbox, &mbConfig, true);
/* one frame buffer per MB */
rxXfer.frame = &frame[i];
rxXfer.mbIdx = mailbox;
FLEXCAN_TransferReceiveNonBlocking(can->base, &can->handle, &rxXfer);
}
return res;
}
static rt_err_t can_control(struct rt_can_device *can_dev, int cmd, void *arg)
{
struct imxrt_can *can;
rt_uint32_t argval, mask;
rt_uint32_t res = RT_EOK;
flexcan_rx_mb_config_t mbConfig;
struct rt_can_filter_config *cfg;
struct rt_can_filter_item *item;
rt_uint8_t i, count, index;
RT_ASSERT(can_dev != RT_NULL);
can = (struct imxrt_can *)can_dev->parent.user_data;
RT_ASSERT(can != RT_NULL);
switch (cmd)
{
case RT_DEVICE_CTRL_SET_INT:
argval = (rt_uint32_t) arg;
if (argval == RT_DEVICE_FLAG_INT_RX)
{
mask = kFLEXCAN_RxWarningInterruptEnable;
}
else if (argval == RT_DEVICE_FLAG_INT_TX)
{
mask = kFLEXCAN_TxWarningInterruptEnable;
}
else if (argval == RT_DEVICE_CAN_INT_ERR)
{
mask = kFLEXCAN_ErrorInterruptEnable;
}
FLEXCAN_EnableInterrupts(can->base, mask);
NVIC_SetPriority(can->irqn, NVIC_EncodePriority(NVIC_GetPriorityGrouping(), 5, 0));
EnableIRQ(can->irqn);
break;
case RT_DEVICE_CTRL_CLR_INT:
/* each CAN device have one IRQ number. */
DisableIRQ(can->irqn);
break;
case RT_CAN_CMD_SET_FILTER:
cfg = (struct rt_can_filter_config *)arg;
item = cfg->items;
count = cfg->count;
if (filter_mask == 0xffffffff)
{
rt_kprintf("%s filter is full!\n", can->name);
res = -RT_ERROR;
break;
}
else if (filter_mask == 0)
{
/* deinit all init RX MB */
for (i = 0; i < RX_MB_COUNT; i++)
{
FLEXCAN_SetRxMbConfig(can->base, i + 1, RT_NULL, false);
}
}
while (count)
{
if (item->ide)
{
mbConfig.format = kFLEXCAN_FrameFormatExtend;
mbConfig.id = FLEXCAN_ID_EXT(item->id);
mask = FLEXCAN_RX_MB_EXT_MASK(item->mask, 0, 0);
}
else
{
mbConfig.format = kFLEXCAN_FrameFormatStandard;
mbConfig.id = FLEXCAN_ID_STD(item->id);
mask = FLEXCAN_RX_MB_STD_MASK(item->mask, 0, 0);
}
if (item->rtr)
{
mbConfig.type = kFLEXCAN_FrameTypeRemote;
}
else
{
mbConfig.type = kFLEXCAN_FrameTypeData;
}
/* user does not specify hdr index,set hdr_bank from RX MB 1 */
if (item->hdr_bank == -1)
{
for (i = 0; i < 32; i++)
{
if (!(filter_mask & (1 << i)))
{
index = i;
break;
}
}
}
else /* use user specified hdr_bank */
{
if (filter_mask & (1 << item->hdr_bank))
{
res = -RT_ERROR;
rt_kprintf("%s hdr%d filter already set!\n", can->name, item->hdr_bank);
break;
}
else
{
index = item->hdr_bank;
}
}
/* RX MB index from 1 to 32,hdr index 0~31 map RX MB index 1~32. */
FLEXCAN_SetRxIndividualMask(can->base, index + 1, mask);
FLEXCAN_SetRxMbConfig(can->base, index + 1, &mbConfig, true);
filter_mask |= 1 << index;
item++;
count--;
}
break;
case RT_CAN_CMD_SET_BAUD:
{
struct can_configure *cfg = (struct can_configure *)arg;
if (cfg != RT_NULL)
{
can->can_dev.config = *cfg;
can_cfg(can_dev, cfg);
res = RT_EOK;
}
else
{
res = -RT_ERROR;
}
break;
}
case RT_CAN_CMD_SET_MODE:
res = -RT_ERROR;
break;
case RT_CAN_CMD_SET_PRIV:
res = -RT_ERROR;
break;
case RT_CAN_CMD_GET_STATUS:
FLEXCAN_GetBusErrCount(can->base, (rt_uint8_t *)(&can->can_dev.status.snderrcnt), (rt_uint8_t *)(&can->can_dev.status.rcverrcnt));
rt_memcpy(arg, &can->can_dev.status, sizeof(can->can_dev.status));
break;
default:
res = -RT_ERROR;
break;
}
return res;
}
static rt_ssize_t can_send(struct rt_can_device *can_dev, const void *buf, rt_uint32_t boxno)
{
struct imxrt_can *can;
struct rt_can_msg *msg;
status_t ret;
flexcan_frame_t frame;
flexcan_mb_transfer_t txXfer;
RT_ASSERT(can_dev != RT_NULL);
RT_ASSERT(buf != RT_NULL);
can = (struct imxrt_can *)can_dev->parent.user_data;
msg = (struct rt_can_msg *) buf;
RT_ASSERT(can != RT_NULL);
RT_ASSERT(msg != RT_NULL);
FLEXCAN_SetTxMbConfig(can->base, boxno, true);
if (RT_CAN_STDID == msg->ide)
{
frame.id = FLEXCAN_ID_STD(msg->id);
frame.format = kFLEXCAN_FrameFormatStandard;
}
else if (RT_CAN_EXTID == msg->ide)
{
frame.id = FLEXCAN_ID_EXT(msg->id);
frame.format = kFLEXCAN_FrameFormatExtend;
}
if (RT_CAN_DTR == msg->rtr)
{
frame.type = kFLEXCAN_FrameTypeData;
}
else if (RT_CAN_RTR == msg->rtr)
{
frame.type = kFLEXCAN_FrameTypeRemote;
}
frame.length = msg->len;
frame.dataByte0 = msg->data[0];
frame.dataByte1 = msg->data[1];
frame.dataByte2 = msg->data[2];
frame.dataByte3 = msg->data[3];
frame.dataByte4 = msg->data[4];
frame.dataByte5 = msg->data[5];
frame.dataByte6 = msg->data[6];
frame.dataByte7 = msg->data[7];
txXfer.mbIdx = boxno;
txXfer.frame = &frame;
ret = FLEXCAN_TransferSendNonBlocking(can->base, &can->handle, &txXfer);
switch (ret)
{
case kStatus_Success:
ret = RT_EOK;
break;
case kStatus_Fail:
ret = -RT_ERROR;
break;
case kStatus_FLEXCAN_TxBusy:
ret = -RT_EBUSY;
break;
}
return (rt_ssize_t)ret;
}
static rt_ssize_t can_recv(struct rt_can_device *can_dev, void *buf, rt_uint32_t boxno)
{
struct imxrt_can *can;
struct rt_can_msg *pmsg;
rt_uint8_t index;
RT_ASSERT(can_dev != RT_NULL);
can = (struct imxrt_can *)can_dev->parent.user_data;
pmsg = (struct rt_can_msg *) buf;
RT_ASSERT(can != RT_NULL);
index = boxno - 1;
if (frame[index].format == kFLEXCAN_FrameFormatStandard)
{
pmsg->ide = RT_CAN_STDID;
pmsg->id = frame[index].id >> CAN_ID_STD_SHIFT;
}
else
{
pmsg->ide = RT_CAN_EXTID;
pmsg->id = frame[index].id >> CAN_ID_EXT_SHIFT;
}
if (frame[index].type == kFLEXCAN_FrameTypeData)
{
pmsg->rtr = RT_CAN_DTR;
}
else if (frame[index].type == kFLEXCAN_FrameTypeRemote)
{
pmsg->rtr = RT_CAN_RTR;
}
pmsg->hdr_index = index; /* one hdr filter per MB */
pmsg->len = frame[index].length;
pmsg->data[0] = frame[index].dataByte0;
pmsg->data[1] = frame[index].dataByte1;
pmsg->data[2] = frame[index].dataByte2;
pmsg->data[3] = frame[index].dataByte3;
pmsg->data[4] = frame[index].dataByte4;
pmsg->data[5] = frame[index].dataByte5;
pmsg->data[6] = frame[index].dataByte6;
pmsg->data[7] = frame[index].dataByte7;
return 0;
}
static struct rt_can_ops imxrt_can_ops =
{
.configure = can_cfg,
.control = can_control,
.sendmsg = can_send,
.recvmsg = can_recv,
};
int rt_hw_can_init(void)
{
int i;
rt_err_t ret = RT_EOK;
struct can_configure config = CANDEFAULTCONFIG;
config.privmode = 0;
config.ticks = 50;
config.sndboxnumber = 1;
config.msgboxsz = RX_MB_COUNT;
#ifdef RT_CAN_USING_HDR
config.maxhdr = RX_MB_COUNT; /* filter count,one filter per MB */
#endif
for (i = 0; i < sizeof(flexcans) / sizeof(flexcans[0]); i++)
{
flexcans[i].can_dev.config = config;
CLOCK_SetClkDiv(flexcans[i].clock_div_name, 1u);
CLOCK_AttachClk(flexcans[i].clock_attach_id);
ret = rt_hw_can_register(&flexcans[i].can_dev, flexcans[i].name, &imxrt_can_ops, &flexcans[i]);
}
return ret;
}
INIT_BOARD_EXPORT(rt_hw_can_init);
#endif /*RT_USING_CAN */
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