LPCOpen Platform  v1.03
LPCOpen Platform for NXP LPC Microcontrollers
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ccan.c
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1 /*
2  * @brief CCAN example
3  * This example show how to the CCAN in 3 mode : Polling, Interrupt and DMA
4  *
5  * @note
6  * Copyright(C) NXP Semiconductors, 2012
7  * All rights reserved.
8  *
9  * @par
10  * Software that is described herein is for illustrative purposes only
11  * which provides customers with programming information regarding the
12  * LPC products. This software is supplied "AS IS" without any warranties of
13  * any kind, and NXP Semiconductors and its licensor disclaim any and
14  * all warranties, express or implied, including all implied warranties of
15  * merchantability, fitness for a particular purpose and non-infringement of
16  * intellectual property rights. NXP Semiconductors assumes no responsibility
17  * or liability for the use of the software, conveys no license or rights under any
18  * patent, copyright, mask work right, or any other intellectual property rights in
19  * or to any products. NXP Semiconductors reserves the right to make changes
20  * in the software without notification. NXP Semiconductors also makes no
21  * representation or warranty that such application will be suitable for the
22  * specified use without further testing or modification.
23  *
24  * @par
25  * Permission to use, copy, modify, and distribute this software and its
26  * documentation is hereby granted, under NXP Semiconductors' and its
27  * licensor's relevant copyrights in the software, without fee, provided that it
28  * is used in conjunction with NXP Semiconductors microcontrollers. This
29  * copyright, permission, and disclaimer notice must appear in all copies of
30  * this code.
31  */
32 
33 #define CCAN_TX_MSG_ID (0x200)
34 #define CCAN_RX_MSG_ID (0x100)
35 #define CCAN_TX_MSG_REMOTE_ID (0x300)
36 
37 // FIXME - needs formatting to correct standards
38 
39 #include "board.h"
40 static char WelcomeMenu[] = "\n\rHello NXP Semiconductors \r\r"
41  "CCAN DEMO : Use C_CAN to transmit and receive Message from CAN Analyzer\r\n"
42  "CCAN bit rate : 500kBit/s\r\n";
43 
44 uint8_t msg_received_counter = 0;
45 
46 void CAN0_IRQHandler(void)
47 {
48  message_object msg_buf;
49  uint32_t can_int, can_stat, i;
50  while ( (can_int = Chip_CCAN_GetIntID(LPC_C_CAN0)) != 0 ) {
51  if (can_int == CCAN_STATUS_INT) {
52  can_stat = Chip_CCAN_GetStatus(LPC_C_CAN0);
53  // TODO with error or TXOK, RXOK
54  if (can_stat & CCAN_STAT_EPASS) {
55  DEBUGOUT("Passive error\r\n");
56  return;
57  }
58  if (can_stat & CCAN_STAT_EWARN) {
59  DEBUGOUT("Warning!!!\r\n");
60  return;
61  }
62  if (can_stat & CCAN_STAT_BOFF) {
63  DEBUGOUT("CAN bus is off\r\n");
64  return;
65  }
66  Chip_CCAN_ClearStatus(LPC_C_CAN0, CCAN_STAT_TXOK);
67  Chip_CCAN_ClearStatus(LPC_C_CAN0, CCAN_STAT_RXOK);
68  }
69  else if ((1 <= can_int) && (can_int <= 0x20)) {
70  // Process msg num canint
71  Chip_CCAN_GetMsgObject(LPC_C_CAN0, can_int, &msg_buf);
72  switch (msg_buf.id) {
73  case CCAN_RX_MSG_ID:
74  Chip_CCAN_ClearIntPend(LPC_C_CAN0, can_int, CCAN_RX_DIR);
75  DEBUGOUT("Msg ID :%x\r\n", msg_buf.id);
76  DEBUGOUT("Msg data :");
77  for (i = 0; i < msg_buf.dlc; i++)
78  DEBUGOUT("%x ", msg_buf.data[i]);
79  DEBUGOUT("\nFeed back...\r\n");
80  msg_buf.id += 1;
81  Chip_CCAN_Send(LPC_C_CAN0, 0, &msg_buf);
82  break;
83 
84  case CCAN_TX_MSG_ID:
85  Chip_CCAN_ClearIntPend(LPC_C_CAN0, can_int, CCAN_TX_DIR);
86  break;
87 
88  case CCAN_TX_MSG_REMOTE_ID:
89  msg_received_counter++;
90  if (msg_received_counter == 5) {
91  DEBUGOUT("Remote transmit total is 5. Delete remote ID\r\n");
92  Chip_CCAN_DeleteReceiveID(LPC_C_CAN0, CCAN_TX_MSG_REMOTE_ID);
93  }
94  break;
95 
96  default:
97  break;
98  }
99  }
100  }
101 }
102 
103 int main(void)
104 {
105  message_object send_obj;
106  Board_Init();
107  DEBUGOUT(WelcomeMenu);
108  /* Set CCAN peripheral clock under 100Mhz for working stable */
109  Chip_Clock_SetBaseClock(CLK_BASE_APB3, CLKIN_IDIVC, true, false);
110  Chip_CCAN_Init(LPC_C_CAN0);
111  Chip_CCAN_SetBitRate(LPC_C_CAN0, 500000);
112  Chip_CCAN_IntEnable(LPC_C_CAN0, ENABLE);
113 
114  send_obj.id = CCAN_TX_MSG_ID;
115  send_obj.dlc = 4;
116  send_obj.data[0] = 'A';
117  send_obj.data[1] = 'B';
118  send_obj.data[2] = 'C';
119  send_obj.data[3] = 'D';
120  Chip_CCAN_Send(LPC_C_CAN0, 0, &send_obj);
121 
122  send_obj.id = CCAN_TX_MSG_REMOTE_ID;
123  send_obj.data[0] = 'E';
124  send_obj.data[1] = 'F';
125  send_obj.data[2] = 'G';
126  send_obj.data[3] = 'H';
127  Chip_CCAN_Send(LPC_C_CAN0, 1, &send_obj);
128 
129  Chip_CCAN_AddReceiveID(LPC_C_CAN0, CCAN_RX_MSG_ID);
130 
131  NVIC_EnableIRQ(C_CAN0_IRQn);
132 
133  while (1);
134 }