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-rwxr-xr-xdrivers/avr/i2c_master.c5
-rwxr-xr-xdrivers/avr/i2c_slave.c25
-rwxr-xr-xdrivers/avr/i2c_slave.h13
3 files changed, 22 insertions, 21 deletions
diff --git a/drivers/avr/i2c_master.c b/drivers/avr/i2c_master.c
index a04e6570d7..19bae33e9f 100755
--- a/drivers/avr/i2c_master.c
+++ b/drivers/avr/i2c_master.c
@@ -179,6 +179,9 @@ i2c_status_t i2c_readReg(uint8_t devaddr, uint8_t regaddr, uint8_t* data, uint16
status = i2c_write(regaddr, timeout);
if (status) return status;
+ status = i2c_stop(timeout);
+ if (status) return status;
+
status = i2c_start(devaddr | 0x01, timeout);
if (status) return status;
@@ -217,4 +220,4 @@ i2c_status_t i2c_stop(uint16_t timeout)
}
return I2C_STATUS_SUCCESS;
-} \ No newline at end of file
+}
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);
} \ No newline at end of file
diff --git a/drivers/avr/i2c_slave.h b/drivers/avr/i2c_slave.h
index 1c3b9ecc00..7b5dcbdc3e 100755
--- a/drivers/avr/i2c_slave.h
+++ b/drivers/avr/i2c_slave.h
@@ -8,16 +8,11 @@
#ifndef I2C_SLAVE_H
#define I2C_SLAVE_H
-#define TX_BUFFER_SIZE 30
-#define RX_BUFFER_SIZE 30
+#define I2C_SLAVE_REG_COUNT 30
-volatile uint8_t buffer_address;
-static volatile bool slave_has_register_set = false;
-volatile uint8_t txbuffer[TX_BUFFER_SIZE];
-volatile uint8_t rxbuffer[RX_BUFFER_SIZE];
+extern volatile uint8_t i2c_slave_reg[I2C_SLAVE_REG_COUNT];
-void i2c_init(uint8_t address);
-void i2c_stop(void);
-ISR(TWI_vect);
+void i2c_slave_init(uint8_t address);
+void i2c_slave_stop(void);
#endif // I2C_SLAVE_H \ No newline at end of file