Merge https://github.com/Longan-Labs/Aruino_CAN_BUS_MCP2515

Author: Pespiri

README.md

@@ -56,7 +56,7 @@ here are many examples implemented in this library. One of the examples is below
     #define CAN_31K25BPS        5
     #define CAN_33KBPS          6
     #define CAN_40KBPS          7
-    #define CAN_47KBPS          19
+    #define CAN_47K619BPS       19
     #define CAN_50KBPS          8
     #define CAN_80KBPS          9
     #define CAN_83K3BPS         10

examples/OBDII_PIDs/OBDII_PIDs.ino

@@ -0,0 +1,120 @@
+/*************************************************************************************************
+    OBD-II_PIDs TEST CODE
+    Loovee, Longan Labs 2022
+
+    Query
+    send id: 0x7df
+      dta: 0x02, 0x01, PID_CODE, 0, 0, 0, 0, 0
+
+    Response
+    From id: 0x7E9 or 0x7EA or 0x7EB
+      dta: len, 0x41, PID_CODE, byte0, byte1(option), byte2(option), byte3(option), byte4(option)
+
+    https://en.wikipedia.org/wiki/OBD-II_PIDs
+***************************************************************************************************/
+
+#include <SPI.h>
+#include "mcp_can.h"
+
+/* Please modify SPI_CS_PIN to adapt to different baords.
+
+   CANBed V1        - 17
+   CANBed M0        - 3
+   CAN Bus Shield   - 9
+   CANBed 2040      - 9
+   CANBed Dual      - 9
+   OBD-2G Dev Kit   - 9
+   Hud Dev Kit      - 9
+*/
+
+#define SPI_CS_PIN  9
+
+MCP_CAN CAN(SPI_CS_PIN);                                    // Set CS pin
+
+#define PID_ENGIN_PRM       0x0C
+#define PID_VEHICLE_SPEED   0x0D
+#define PID_COOLANT_TEMP    0x05
+
+#define CAN_ID_PID          0x7DF
+
+void set_mask_filt()
+{
+    // set mask, set both the mask to 0x3ff
+
+    CAN.init_Mask(0, 0, 0x7FC);
+    CAN.init_Mask(1, 0, 0x7FC);
+
+    // set filter, we can receive id from 0x04 ~ 0x09
+
+    CAN.init_Filt(0, 0, 0x7E8);                 
+    CAN.init_Filt(1, 0, 0x7E8);
+
+    CAN.init_Filt(2, 0, 0x7E8);
+    CAN.init_Filt(3, 0, 0x7E8);
+    CAN.init_Filt(4, 0, 0x7E8); 
+    CAN.init_Filt(5, 0, 0x7E8);
+}
+
+void sendPid(unsigned char __pid) {
+    unsigned char tmp[8] = {0x02, 0x01, __pid, 0, 0, 0, 0, 0};
+    CAN.sendMsgBuf(CAN_ID_PID, 0, 8, tmp);
+}
+
+bool getRPM(int *r)
+{
+    sendPid(PID_ENGIN_PRM);
+    unsigned long __timeout = millis();
+
+    while(millis()-__timeout < 1000)      // 1s time out
+    {
+        unsigned char len = 0;
+        unsigned char buf[8];
+
+        if (CAN_MSGAVAIL == CAN.checkReceive()) {                // check if get data
+            CAN.readMsgBuf(&len, buf);    // read data,  len: data length, buf: data buf
+
+            if(buf[1] == 0x41)
+            {
+                *r = (256*buf[3]+buf[4])/4;
+                return 1;
+            }
+        }
+    }
+
+    return 0;
+}
+
+void setup() 
+{
+    Serial.begin(115200);
+    while(!Serial);
+    
+    // below code need for OBD-II GPS Dev Kit
+    // pinMode(A3, OUTPUT);
+    // digitalWrite(A3, HIGH);
+
+    while (CAN_OK != CAN.begin(CAN_500KBPS)) {             // init can bus : baudrate = 500k
+        Serial.println("CAN init fail, retry...");
+        delay(100);
+    }
+    Serial.println("CAN init ok!");
+    set_mask_filt();
+}
+
+void loop() {
+
+    int __rpm = 0;
+
+    int ret = getRPM(&__rpm);
+
+    if(ret)
+    {
+        Serial.print("Engin Speed: ");
+        Serial.print(__rpm);
+        Serial.println(" rpm");
+    }else Serial.println("get Engin Speed Fail...");
+
+    delay(500);
+}
+
+// END FILE