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add set mask and filter example

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This commit is contained in:
reeedstudio
2014-07-08 20:11:32 +08:00
parent 84c05a811f
commit 64ca6c9c32
4 changed files with 143 additions and 12 deletions
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examples/set_mask_filter_recv/set_mask_filter_recv.ino
+87
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@@ -0,0 +1,87 @@
// demo: CAN-BUS Shield, receive data with interrupt mode, and set mask and filter
//
// when in interrupt mode, the data coming can't be too fast, must >20ms, or else you can use check mode
// loovee, 2014-7-8
#include <SPI.h>
#include "mcp_can.h"
MCP_CAN CAN(9); // Set CS to pin 10
unsigned char Flag_Recv = 0;
unsigned char len = 0;
unsigned char buf[8];
char str[20];
void setup()
{
Serial.begin(115200);
START_INIT:
if(CAN_OK == CAN.begin(CAN_500KBPS)) // init can bus : baudrate = 500k
{
Serial.println("CAN BUS Shield init ok!");
}
else
{
Serial.println("CAN BUS Shield init fail");
Serial.println("Init CAN BUS Shield again");
delay(100);
goto START_INIT;
}
attachInterrupt(0, MCP2515_ISR, FALLING); // start interrupt
/*
* set mask, set both the mask to 0x3ff
*/
CAN.init_Mask(0, 0, 0x3ff); // there are 2 mask in mcp2515, you need to set both of them
CAN.init_Mask(1, 0, 0x3ff);
/*
* set filter, we can receive id from 0x04 ~ 0x09
*/
CAN.init_Filt(0, 0, 0x04); // there are 6 filter in mcp2515
CAN.init_Filt(1, 0, 0x05); // there are 6 filter in mcp2515
CAN.init_Filt(2, 0, 0x06); // there are 6 filter in mcp2515
CAN.init_Filt(3, 0, 0x07); // there are 6 filter in mcp2515
CAN.init_Filt(4, 0, 0x08); // there are 6 filter in mcp2515
CAN.init_Filt(5, 0, 0x09); // there are 6 filter in mcp2515
}
void MCP2515_ISR()
{
Flag_Recv = 1;
}
void loop()
{
if(Flag_Recv) // check if get data
{
Flag_Recv = 0; // clear flag
CAN.readMsgBuf(&len, buf); // read data, len: data length, buf: data buf
Serial.println("\r\n------------------------------------------------------------------");
Serial.print("Get Data From id: ");
Serial.println(CAN.getCanId());
for(int i = 0; i<len; i++) // print the data
{
Serial.print("0x");
Serial.print(buf[i], HEX);
Serial.print("\t");
}
Serial.println();
}
}
/*********************************************************************************************************
END FILE
*********************************************************************************************************/
examples/set_mask_filter_send/set_mask_filter_send.ino
+42
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@@ -0,0 +1,42 @@
// demo: set_mask_filter_send
// this demo will show you how to use mask and filter
#include <mcp_can.h>
#include <SPI.h>
MCP_CAN CAN(10); // Set CS to pin 10
void setup()
{
Serial.begin(115200);
START_INIT:
if(CAN_OK == CAN.begin(CAN_500KBPS)) // init can bus : baudrate = 500k
{
Serial.println("CAN BUS Shield init ok!");
}
else
{
Serial.println("CAN BUS Shield init fail");
Serial.println("Init CAN BUS Shield again");
delay(100);
goto START_INIT;
}
}
unsigned char stmp[8] = {0, 1, 2, 3, 4, 5, 6, 7};
void loop()
{
for(int id=0; id<10; id++)
{
memset(stmp, id, sizeof(stmp)); // set id to send data buff
CAN.sendMsgBuf(id, 0, sizeof(stmp), stmp);
delay(100);
}
}
/*********************************************************************************************************
END FILE
*********************************************************************************************************/
mcp_can.cpp
+13 -11
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@@ -29,7 +29,7 @@
** Function name: mcp2515_reset
** Descriptions: reset the device
*********************************************************************************************************/
void MCP_CAN::mcp2515_reset(void)
void MCP_CAN::mcp2515_reset(void)
{
MCP2515_SELECT();
spi_readwrite(MCP_RESET);
@@ -271,16 +271,16 @@ void MCP_CAN::mcp2515_initCANBuffers(void)
INT32U ulMask = 0x00, ulFilt = 0x00;
mcp2515_write_id(MCP_RXM0SIDH, ext, ulMask); /*Set both masks to 0 */
mcp2515_write_id(MCP_RXM1SIDH, ext, ulMask); /*Mask register ignores ext bit */
//mcp2515_write_id(MCP_RXM0SIDH, ext, ulMask); /*Set both masks to 0 */
//mcp2515_write_id(MCP_RXM1SIDH, ext, ulMask); /*Mask register ignores ext bit */
/* Set all filters to 0 */
mcp2515_write_id(MCP_RXF0SIDH, ext, ulFilt); /* RXB0: extended */
mcp2515_write_id(MCP_RXF1SIDH, std, ulFilt); /* RXB1: standard */
mcp2515_write_id(MCP_RXF2SIDH, ext, ulFilt); /* RXB2: extended */
mcp2515_write_id(MCP_RXF3SIDH, std, ulFilt); /* RXB3: standard */
mcp2515_write_id(MCP_RXF4SIDH, ext, ulFilt);
mcp2515_write_id(MCP_RXF5SIDH, std, ulFilt);
/* Set all filters to 0 */
//mcp2515_write_id(MCP_RXF0SIDH, ext, ulFilt); /* RXB0: extended */
//mcp2515_write_id(MCP_RXF1SIDH, std, ulFilt); /* RXB1: standard */
//mcp2515_write_id(MCP_RXF2SIDH, ext, ulFilt); /* RXB2: extended */
//mcp2515_write_id(MCP_RXF3SIDH, std, ulFilt); /* RXB3: standard */
//mcp2515_write_id(MCP_RXF4SIDH, ext, ulFilt);
//mcp2515_write_id(MCP_RXF5SIDH, std, ulFilt);
/* Clear, deactivate the three */
/* transmit buffers */
@@ -658,7 +658,9 @@ INT8U MCP_CAN::setMsg(INT32U id, INT8U ext, INT8U len, INT8U *pData)
m_nID = id;
m_nDlc = len;
for(i = 0; i<MAX_CHAR_IN_MESSAGE; i++)
m_nDta[i] = *(pData+i);
{
m_nDta[i] = *(pData+i);
}
return MCP2515_OK;
}
mcp_can.h
+1 -1
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@@ -44,7 +44,7 @@ class MCP_CAN
* mcp2515 driver function
*/
// private:
private:
private:
void mcp2515_reset(void); /* reset mcp2515 */