LPC54XX CAN 如何配置
本帖最后由 xiaolun217001 于 2018-6-5 19:53 编辑#define MSG_RAM_BASE 0x20010000U
#define STD_FILTER_OFS 0x0
#define RX_FIFO0_OFS 0x10U
#define TX_BUFFER_OFS 0x20U
MCAN_GetDefaultConfig(&mcanConfig);
MCAN_Init(EXAMPLE_MCAN, &mcanConfig, MCAN_CLK_FREQ);
/* Create MCAN handle structure and set call back function. */
MCAN_TransferCreateHandle(EXAMPLE_MCAN, &mcanHandle, mcan_callback, NULL);
/* Set Message RAM base address and clear to avoid BEU/BEC error. */
MCAN_SetMsgRAMBase(EXAMPLE_MCAN, MSG_RAM_BASE);
uint32_t *p=(uint32_t *)(MSG_RAM_BASE);
memset(p, 0, TX_BUFFER_OFS + 0x10U);
/* STD filter config. */
rxFilter.address = STD_FILTER_OFS;
rxFilter.idFormat = kMCAN_FrameIDStandard;
rxFilter.listSize = 1U;
rxFilter.nmFrame = kMCAN_reject0;
rxFilter.remFrame = kMCAN_rejectFrame;
MCAN_SetFilterConfig(EXAMPLE_MCAN, &rxFilter);
stdFilter.sfec = kMCAN_storeinFifo0;
/* Classic filter mode, only filter matching ID. */
stdFilter.sft = kMCAN_classic;
stdFilter.sfid1 = rxIdentifier;
stdFilter.sfid2 = 0x7FFU;
MCAN_SetSTDFilterElement(EXAMPLE_MCAN, &rxFilter, &stdFilter, 0);
/* RX fifo0 config. */
rxFifo0.address = RX_FIFO0_OFS;
rxFifo0.elementSize = 1U;
rxFifo0.watermark = 0;
rxFifo0.opmode = kMCAN_FifoBlocking;
rxFifo0.datafieldSize = kMCAN_8ByteDatafield;
MCAN_SetRxFifo0Config(EXAMPLE_MCAN, &rxFifo0);
/* TX buffer config. */
txBuffer.address = TX_BUFFER_OFS;
txBuffer.dedicatedSize = 1U;
txBuffer.fqSize = 0;
txBuffer.datafieldSize = kMCAN_8ByteDatafield;
MCAN_SetTxBufferConfig(EXAMPLE_MCAN, &txBuffer);
/* Finish software initialization and enter normal mode, synchronizes to
CAN bus, ready for communication */
MCAN_EnterNormalMode(EXAMPLE_MCAN);
本帖最后由 xiaolun217001 于 2018-6-5 19:54 编辑
这是例程上的配置，配置 Message RAM应配置多大？收发元素大小应该配置多少？挣不清楚，手册写的比较简单，看不出怎么配置 不了解LPC，帮顶下。
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