diff options
Diffstat (limited to 'drivers/avr/i2c_slave.c')
| -rwxr-xr-x | drivers/avr/i2c_slave.c | 25 | 
1 files changed, 14 insertions, 11 deletions
| diff --git a/drivers/avr/i2c_slave.c b/drivers/avr/i2c_slave.c index 27696ca01a..18a29a45a5 100755 --- a/drivers/avr/i2c_slave.c +++ b/drivers/avr/i2c_slave.c @@ -9,23 +9,26 @@  #include "i2c_slave.h" -void i2c_init(uint8_t address){ +volatile uint8_t i2c_slave_reg[I2C_SLAVE_REG_COUNT]; + +static volatile uint8_t buffer_address; +static volatile bool slave_has_register_set = false; + +void i2c_slave_init(uint8_t address){      // load address into TWI address register      TWAR = (address << 1);      // set the TWCR to enable address matching and enable TWI, clear TWINT, enable TWI interrupt      TWCR = (1 << TWIE) | (1 << TWEA) | (1 << TWINT) | (1 << TWEN);  } -void i2c_stop(void){ +void i2c_slave_stop(void){      // clear acknowledge and enable bits      TWCR &= ~((1 << TWEA) | (1 << TWEN));  }  ISR(TWI_vect){      uint8_t ack = 1; -    // temporary stores the received data -    //uint8_t data; -     +      switch(TW_STATUS){          case TW_SR_SLA_ACK:              // The device is now a slave receiver @@ -38,13 +41,13 @@ ISR(TWI_vect){              if(!slave_has_register_set){                  buffer_address = TWDR; -                if (buffer_address >= RX_BUFFER_SIZE){ // address out of bounds dont ack -                    ack = 0; -                    buffer_address = 0; +                if (buffer_address >= I2C_SLAVE_REG_COUNT) {  // address out of bounds dont ack +                  ack            = 0; +                  buffer_address = 0;                  }                  slave_has_register_set = true; // address has been receaved now fill in buffer              } else { -                rxbuffer[buffer_address] = TWDR; +                i2c_slave_reg[buffer_address] = TWDR;                  buffer_address++;              }              break; @@ -52,7 +55,7 @@ ISR(TWI_vect){          case TW_ST_SLA_ACK:          case TW_ST_DATA_ACK:              // This device is a slave transmitter and master has requested data -            TWDR = txbuffer[buffer_address]; +            TWDR = i2c_slave_reg[buffer_address];              buffer_address++;              break; @@ -63,6 +66,6 @@ ISR(TWI_vect){              break;      } -    // Reset i2c state mahcine to be ready for next interrupt +    // Reset i2c state machine to be ready for next interrupt      TWCR |= (1 << TWIE) | (1 << TWINT) | (ack << TWEA) | (1 << TWEN);  }
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