i2c Master- i2c to slave (avalon mm bridge) error

[druva1]

Hi,

I have a Max10 Board, first I set it up as a Master (i2c core) and an Arduino Board as a slave, I successfully send and received data.

But when I wanted to add a RAM memory connected to a i2c slave to Avalon MM master bridge it does not work.

When I am trying to transmit the data I keep getting the error [-7], busy.

Here is my code, if someone can help me out:

int main(){

 printf("Hello from Nios II!\n");

 ALT_AVALON_I2C_DEV_t *i2c_dev; //pointer to instance structure

 ALT_AVALON_I2C_MASTER_CONFIG_t cfg;

 alt_u8 retry = 0;

 alt_u32 *chip_id = 0;

 int i;

 alt_u8 *ocram[2]; //create slave RAM

 ocram[0] = (alt_u8*)(I2C_MEM_0_BASE | 0x80000000);

 ocram[1] = (alt_u8*)(I2C_MEM_1_BASE | 0x80000000);

 // fill block of memory

 for(i=0;i<2;i++){

 memset((void*)ocram[i],i, I2C_MEM_0_SIZE_VALUE); // i2c slave memory clear, 256 bytes

 }

  // Get a pointer to the Avalon i2c block instance

  // NOTE: Must match the name on Platform Designer

  i2c_dev = alt_avalon_i2c_open("/dev/i2c");

  if(NULL==i2c_dev){

   printf("Error: Cannot find /dev/i2c\n");

   return FALSE;

   }

  usleep(100);

  // Speed settings 

  alt_avalon_i2c_master_config_speed_set(i2c_dev,&cfg,100000);

  alt_avalon_i2c_master_config_set(i2c_dev,&cfg);

  //set the address of the device using (32 bits address)

  alt_avalon_i2c_master_target_set(i2c_dev,0x50);

  // Function: Get i2c Slave ID

  while((retry++ < 2)){

   alt_avalon_i2c_master_target_get(i2c_dev, chip_id);

   printf("Read chip ID: ");

   printf("0x%04x\n" , chip_id[0]);

   usleep(100);

  }

  for(i=0;i<2;i++){

   i2c_write(i2c_dev,DEV_ADR+i);

  }

  for(i=0;i<2;i++){

  printf("\nI2CSLAVE%d:\n",i);

  dump(ocram[i],256);

  }

 return 0;

}

int i2c_write(ALT_AVALON_I2C_DEV_t *i2c_dev, unsigned char adr){

int i;

alt_u8 txbuffer[MEM_SIZE+BYTE_MODE];

ALT_AVALON_I2C_STATUS_CODE status;

printf("\nADR=%x\n", adr);

usleep(1000000);

//start address of register

txbuffer[0] = WRITE_ADR;

//set value in send buffer

for(i = 0;i<MEM_SIZE;i++){

txbuffer[i+BYTE_MODE] = i|0x80; // some data

}

alt_avalon_i2c_disable(i2c_dev);

dump(txbuffer,MEM_SIZE+BYTE_MODE);

status=alt_avalon_i2c_enable(i2c_dev);

printf("Status[%d]\n",(int)status);

status = alt_avalon_i2c_master_tx(i2c_dev,txbuffer,MEM_SIZE+1, ALT_AVALON_I2C_NO_INTERRUPTS);

if(status !=ALT_AVALON_I2C_SUCCESS){

printf("Error:Tx Fail[%d]\n",(int)status);

return FALSE;

}

printf("data send");

return TRUE;

}

[EricMunYew_C_Intel]

Hi, Daysi

Can you forward to me your Platform Designer connection diagram ?

There will be a synchronizer automatically added where there is a cross clock.

Thanks.

Eric

[EricMunYew_C_Intel]

Hi, Daysi

You may refer to page 190 - 199 of below.

https://www.intel.com/content/dam/www/programmable/us/en/pdfs/literature/ug/ug_embedded_ip.pdf

There are 3 bits of stealing address which you can enable or disable in the control byte.

Please follow the read and write protocol of the IP. And you will need to modify the interface of the I2C of the IP to off chip.

Thanks.

Eric

[EricMunYew_C_Intel]

Hi, Daysi

Can we close the case if you have no question ?

Thanks.

Eric