hallo,
danke für's Update!
das ist aber jetzt noch immer nicht mein ursprünglicher i2c-Job mit je 32 bytes vom Raspi aus abwechselnd vom Arduino lesen / an Arduino schreiben, mit je 10ms delay dazwischen, oder?
Mein Arduino-Slave code muss unbedingt so bleiben wie er war!
Code:// Arduino code to send/receive byte arrays // Arduino as an I2C slave // // ver. 0.002b #include <Wire.h> #define SLAVE_ADDRESS 0x04 #define MSGSIZE 32 byte recvarray[MSGSIZE]; // 0=0xff; 1=chksum; ...data...; MSGSIZE-1=SLAVE_ADDRESS byte sendarray[MSGSIZE]; volatile int8_t flag=0; //===================================================================================== //===================================================================================== void setup() { int32_t i=0; // Serial terminal window i=115200; Serial.begin(i); Serial.print("Serial started, baud="); Serial.println(i); // Wire (i2c) Wire.begin(SLAVE_ADDRESS); // start Arduino as a I2C slave, addr=0x04 (7-bit coded) Wire.onReceive(receiveData ); // event when master array is sent Wire.onRequest(sendData ); // event when master requests array to read memset(sendarray, 0, sizeof(sendarray) ); // init send- and recv arrays memset(recvarray, 0, sizeof(recvarray) ); Serial.print("I2C init: my slave address= "); Serial.println(SLAVE_ADDRESS); Serial.println("I2C init: done."); Serial.println(); Serial.println("setup(): done."); } //===================================================================================== uint8_t calcchecksum(uint8_t array[]) { int32_t sum=0; for(int i=2; i<MSGSIZE; ++i) sum+=(array[i]); return (sum & 0x00ff); } //===================================================================================== void loop() { char sbuf[128]; Serial.println(); Serial.println(); // do something with the received data // and then do something to build the sendarray [3]...[MSG_SIZE-2] if (flag==1) { //debug sendarray[4] +=1; } sendarray[0] = 0xff; // 0 = start: 0xff == msg start flag sendarray[2] = flag; // 2 = send back msg error flag sendarray[MSGSIZE-1] = SLAVE_ADDRESS; // end of array: ID check sendarray[1] = calcchecksum(sendarray); // 1 = calc new chksum flag=0; // debug output sprintf(sbuf, "Sendarr[4]=%4d, [5]=%4d, Recvarr[4]=%4d, [5]=%4d", sendarray[4], sendarray[5], recvarray[4], recvarray[5]) ; Serial.println(sbuf); delay(1); // short break for the cpu and the bus } //===================================================================================== void receiveData(int byteCount) { int32_t i; byte val; while(Wire.available()<MSGSIZE) ; // wait for all bytes to complete i=0; // init counter var while(Wire.available()&& (i<MSGSIZE) ) // read all recv array bytes { val=Wire.read(); recvarray[i++]=val; } // check for transmission error if( (recvarray[0] == 0xff) && (recvarray[1] == calcchecksum(recvarray)) && (recvarray[MSGSIZE-1] == SLAVE_ADDRESS ) ) flag=1; // data ok else flag=127; // data faulty => handle rcv-error => flag =127 } //===================================================================================== void sendData(){ // Wire.write writes data from a slave device in response to a request from a master Wire.write(sendarray, MSGSIZE); // send own byte array back to master..
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Zitat von HaWe
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