9 files changed, 178 insertions(+), 146 deletions(-)

M drivers/avr/i2c_master.c
M drivers/avr/i2c_master.h
M drivers/avr/is31fl3731.c
M drivers/avr/is31fl3731.h
M keyboards/ergodox_ez/config.h
M keyboards/ergodox_ez/ergodox_ez.c
M keyboards/ergodox_ez/ergodox_ez.h
M keyboards/ergodox_ez/matrix.c
M quantum/rgb_matrix.c

@@ 19,7 19,7 @@ void i2c_init(void)
   //TWBR = 10;
 }
 
-i2c_status_t i2c_start(uint8_t address, uint8_t timeout)
+i2c_status_t i2c_start(uint8_t address, uint16_t timeout)
 {
 	// reset TWI control register
 	TWCR = 0;


@@ 28,13 28,13 @@ i2c_status_t i2c_start(uint8_t address, uint8_t timeout)
 
   uint16_t timeout_timer = timer_read();
   while( !(TWCR & (1<<TWINT)) ) {
-    if (timeout && (timer_read() - timeout_timer) > timeout) {
+    if (timeout && ((timer_read() - timeout_timer) > timeout)) {
       return I2C_STATUS_TIMEOUT;
     }
   }
 
 	// check if the start condition was successfully transmitted
-	if(((TW_STATUS & 0xF8) != TW_START) && ((TW_STATUS & 0xF8) != TW_REP_START)){ return 1; }
+	if(((TW_STATUS & 0xF8) != TW_START) && ((TW_STATUS & 0xF8) != TW_REP_START)){ return I2C_STATUS_ERROR; }
 
 	// load slave address into data register
 	TWDR = address;


@@ 43,19 43,19 @@ i2c_status_t i2c_start(uint8_t address, uint8_t timeout)
 
   timeout_timer = timer_read();
   while( !(TWCR & (1<<TWINT)) ) {
-    if (timeout && (timer_read() - timeout_timer) > I2C_TIMEOUT) {
+    if (timeout && ((timer_read() - timeout_timer) > timeout)) {
       return I2C_STATUS_TIMEOUT;
     }
   }
 
 	// check if the device has acknowledged the READ / WRITE mode
 	uint8_t twst = TW_STATUS & 0xF8;
-	if ( (twst != TW_MT_SLA_ACK) && (twst != TW_MR_SLA_ACK) ) return 1;
+	if ( (twst != TW_MT_SLA_ACK) && (twst != TW_MR_SLA_ACK) ) return I2C_STATUS_ERROR;
 
-	return 0;
+	return I2C_STATUS_SUCCESS;
 }
 
-i2c_status_t i2c_write(uint8_t data, uint8_t timeout)
+i2c_status_t i2c_write(uint8_t data, uint16_t timeout)
 {
 	// load data into data register
 	TWDR = data;


@@ 64,17 64,17 @@ i2c_status_t i2c_write(uint8_t data, uint8_t timeout)
 
   uint16_t timeout_timer = timer_read();
   while( !(TWCR & (1<<TWINT)) ) {
-    if (timeout && (timer_read() - timeout_timer) > I2C_TIMEOUT) {
+    if (timeout && ((timer_read() - timeout_timer) > timeout)) {
       return I2C_STATUS_TIMEOUT;
     }
   }
 
-	if( (TW_STATUS & 0xF8) != TW_MT_DATA_ACK ){ return 1; }
+	if( (TW_STATUS & 0xF8) != TW_MT_DATA_ACK ){ return I2C_STATUS_ERROR; }
 
-	return 0;
+	return I2C_STATUS_SUCCESS;
 }
 
-i2c_status_t i2c_read_ack(uint8_t timeout)
+int16_t i2c_read_ack(uint16_t timeout)
 {
 
 	// start TWI module and acknowledge data after reception


@@ 82,7 82,7 @@ i2c_status_t i2c_read_ack(uint8_t timeout)
 
   uint16_t timeout_timer = timer_read();
   while( !(TWCR & (1<<TWINT)) ) {
-    if (timeout && (timer_read() - timeout_timer) > I2C_TIMEOUT) {
+    if (timeout && ((timer_read() - timeout_timer) > timeout)) {
       return I2C_STATUS_TIMEOUT;
     }
   }


@@ 91,7 91,7 @@ i2c_status_t i2c_read_ack(uint8_t timeout)
 	return TWDR;
 }
 
-i2c_status_t i2c_read_nack(uint8_t timeout)
+int16_t i2c_read_nack(uint16_t timeout)
 {
 
 	// start receiving without acknowledging reception


@@ 99,7 99,7 @@ i2c_status_t i2c_read_nack(uint8_t timeout)
 
   uint16_t timeout_timer = timer_read();
   while( !(TWCR & (1<<TWINT)) ) {
-    if (timeout && (timer_read() - timeout_timer) > I2C_TIMEOUT) {
+    if (timeout && ((timer_read() - timeout_timer) > timeout)) {
       return I2C_STATUS_TIMEOUT;
     }
   }


@@ 108,81 108,112 @@ i2c_status_t i2c_read_nack(uint8_t timeout)
 	return TWDR;
 }
 
-i2c_status_t i2c_transmit(uint8_t address, uint8_t* data, uint16_t length)
+i2c_status_t i2c_transmit(uint8_t address, uint8_t* data, uint16_t length, uint16_t timeout)
 {
-	if (i2c_start(address | I2C_WRITE)) return 1;
+  i2c_status_t status = i2c_start(address | I2C_WRITE, timeout);
+	if (status) return status;
 
-	for (uint16_t i = 0; i < length; i++)
-	{
-		if (i2c_write(data[i])) return 1;
+	for (uint16_t i = 0; i < length; i++) {
+		status = i2c_write(data[i], timeout);
+    if (status) return status;
 	}
 
-	i2c_stop();
+	status = i2c_stop(timeout);
+  if (status) return status;
 
-	return 0;
+	return I2C_STATUS_SUCCESS;
 }
 
-uint8_t i2c_receive(uint8_t address, uint8_t* data, uint16_t length)
+i2c_status_t i2c_receive(uint8_t address, uint8_t* data, uint16_t length, uint16_t timeout)
 {
-	if (i2c_start(address | I2C_READ)) return 1;
-
-	for (uint16_t i = 0; i < (length-1); i++)
-	{
-		data[i] = i2c_read_ack();
+  i2c_status_t status = i2c_start(address | I2C_READ, timeout);
+	if (status) return status;
+
+	for (uint16_t i = 0; i < (length-1); i++) {
+    status = i2c_read_ack(timeout);
+    if (status >= 0) {
+      data[i] = status;
+    } else {
+      return status;
+    }
 	}
-	data[(length-1)] = i2c_read_nack();
 
-	i2c_stop();
+  status = i2c_read_nack(timeout);
+  if (status >= 0 ) {
+    data[(length-1)] = status;
+  } else {
+    return status;
+  }
+
+  status = i2c_stop(timeout);
+  if (status) return status;
 
-	return 0;
+	return I2C_STATUS_SUCCESS;
 }
 
-uint8_t i2c_writeReg(uint8_t devaddr, uint8_t regaddr, uint8_t* data, uint16_t length)
+i2c_status_t i2c_writeReg(uint8_t devaddr, uint8_t regaddr, uint8_t* data, uint16_t length, uint16_t timeout)
 {
-	if (i2c_start(devaddr | 0x00)) return 1;
+  i2c_status_t status = i2c_start(devaddr | 0x00, timeout);
+	if (status) return status;
 
-	i2c_write(regaddr);
+	status = i2c_write(regaddr, timeout);
+  if (status) return status;
 
-	for (uint16_t i = 0; i < length; i++)
-	{
-		if (i2c_write(data[i])) return 1;
+	for (uint16_t i = 0; i < length; i++) {
+    status = i2c_write(data[i], timeout);
+		if (status) return status;
 	}
 
-	i2c_stop();
+	status = i2c_stop(timeout);
+  if (status) return status;
 
-	return 0;
+	return I2C_STATUS_SUCCESS;
 }
 
-uint8_t i2c_readReg(uint8_t devaddr, uint8_t regaddr, uint8_t* data, uint16_t length)
+i2c_status_t i2c_readReg(uint8_t devaddr, uint8_t regaddr, uint8_t* data, uint16_t length, uint16_t timeout)
 {
-	if (i2c_start(devaddr)) return 1;
+  i2c_status_t status = i2c_start(devaddr, timeout);
+	if (status) return status;
 
-	i2c_write(regaddr);
+  status = i2c_write(regaddr, timeout);
+  if (status) return status;
 
-	if (i2c_start(devaddr | 0x01)) return 1;
+  status = i2c_start(devaddr | 0x01, timeout);
+	if (status) return status;
 
-	for (uint16_t i = 0; i < (length-1); i++)
-	{
-		data[i] = i2c_read_ack();
+	for (uint16_t i = 0; i < (length-1); i++) {
+		status = i2c_read_ack(timeout);
+    if (status >= 0) {
+      data[i] = status;
+    } else {
+      return status;
+    }
 	}
-	data[(length-1)] = i2c_read_nack();
 
-	i2c_stop();
+  status = i2c_read_nack(timeout);
+  if (status >= 0 ) {
+    data[(length-1)] = status;
+  } else {
+    return status;
+  }
+
+  status = i2c_stop(timeout);
+  if (status) return status;
 
-	return 0;
+	return I2C_STATUS_SUCCESS;
 }
 
-i2c_status_t i2c_stop(uint8_t timeout)
+i2c_status_t i2c_stop(uint16_t timeout)
 {
 	// transmit STOP condition
 	TWCR = (1<<TWINT) | (1<<TWEN) | (1<<TWSTO);
 
   uint16_t timeout_timer = timer_read();
   while(TWCR & (1<<TWSTO)) {
-      if (timeout && (timer_read() - timeout_timer) > I2C_TIMEOUT) {
+    if (timeout && ((timer_read() - timeout_timer) > timeout)) {
       return I2C_STATUS_TIMEOUT;
     }
   }
 
-  return 0;
+  return I2C_STATUS_SUCCESS;
 }

@@ 8,20 8,21 @@
 #define I2C_READ 0x01
 #define I2C_WRITE 0x00
 
-typedef i2c_status_t int16_t
-#define I2C_STATUS_TIMEOUT (-1)
+typedef int16_t i2c_status_t;
 
-#define I2C_NO_TIMEOUT 0
+#define I2C_STATUS_SUCCESS (0)
+#define I2C_STATUS_ERROR   (-1)
+#define I2C_STATUS_TIMEOUT (-2)
 
 void i2c_init(void);
-i2c_status_t i2c_start(uint8_t address, uint8_t timeout);
-i2c_status_t i2c_write(uint8_t data, uint8_t timeout);
-i2c_status_t i2c_read_ack(uint8_t timeout);
-i2c_status_t i2c_read_nack(uint8_t timeout);
-uint8_t i2c_transmit(uint8_t address, uint8_t* data, uint16_t length);
-uint8_t i2c_receive(uint8_t address, uint8_t* data, uint16_t length);
-uint8_t i2c_writeReg(uint8_t devaddr, uint8_t regaddr, uint8_t* data, uint16_t length);
-uint8_t i2c_readReg(uint8_t devaddr, uint8_t regaddr, uint8_t* data, uint16_t length);
-i2c_status_t i2c_stop(uint8_t timeout);
+i2c_status_t i2c_start(uint8_t address, uint16_t timeout);
+i2c_status_t i2c_write(uint8_t data, uint16_t timeout);
+int16_t i2c_read_ack(uint16_t timeout);
+int16_t i2c_read_nack(uint16_t timeout);
+i2c_status_t i2c_transmit(uint8_t address, uint8_t* data, uint16_t length, uint16_t timeout);
+i2c_status_t i2c_receive(uint8_t address, uint8_t* data, uint16_t length, uint16_t timeout);
+i2c_status_t i2c_writeReg(uint8_t devaddr, uint8_t regaddr, uint8_t* data, uint16_t length, uint16_t timeout);
+i2c_status_t i2c_readReg(uint8_t devaddr, uint8_t regaddr, uint8_t* data, uint16_t length, uint16_t timeout);
+i2c_status_t i2c_stop(uint16_t timeout);
 
 #endif // I2C_MASTER_H

@@ 49,6 49,14 @@
 #define ISSI_COMMANDREGISTER 0xFD
 #define ISSI_BANK_FUNCTIONREG 0x0B    // helpfully called 'page nine'
 
+#ifndef ISSI_TIMEOUT
+  #define ISSI_TIMEOUT 100
+#endif
+
+#ifndef ISSI_PERSISTENCE
+  #define ISSI_PERSISTENCE 0
+#endif
+
 // Transfer buffer for TWITransmitData()
 uint8_t g_twi_transfer_buffer[20];
 


@@ 78,100 86,104 @@ bool g_led_control_registers_update_required = false;
 // 0x10 - R16,R15,R14,R13,R12,R11,R10,R09
 
 
-uint8_t IS31FL3731_write_register( uint8_t addr, uint8_t reg, uint8_t data )
+void IS31FL3731_write_register( uint8_t addr, uint8_t reg, uint8_t data )
 {
 	g_twi_transfer_buffer[0] = reg;
 	g_twi_transfer_buffer[1] = data;
 
-	//Transmit data until succesful
-  //while(i2c_transmit(addr << 1, g_twi_transfer_buffer,2) != 0);
-  return i2c_transmit(addr << 1, g_twi_transfer_buffer,2);
+  #if ISSI_PERSISTENCE > 0
+    for (uint8_t i = 0; i < ISSI_PERSISTENCE; i++) {
+      if (i2c_transmit(addr << 1, g_twi_transfer_buffer, 2, ISSI_TIMEOUT) == 0)
+        break;
+    }
+  #else
+    i2c_transmit(addr << 1, g_twi_transfer_buffer, 2, ISSI_TIMEOUT);
+  #endif
 }
 
-uint8_t IS31FL3731_write_pwm_buffer( uint8_t addr, uint8_t *pwm_buffer )
+void IS31FL3731_write_pwm_buffer( uint8_t addr, uint8_t *pwm_buffer )
 {
-  uint8_t ret = 0;
 	// assumes bank is already selected
 
 	// transmit PWM registers in 9 transfers of 16 bytes
 	// g_twi_transfer_buffer[] is 20 bytes
 
 	// iterate over the pwm_buffer contents at 16 byte intervals
-	for ( int i = 0; i < 144; i += 16 )
-	{
+	for ( int i = 0; i < 144; i += 16 ) {
 		// set the first register, e.g. 0x24, 0x34, 0x44, etc.
 		g_twi_transfer_buffer[0] = 0x24 + i;
 		// copy the data from i to i+15
 		// device will auto-increment register for data after the first byte
 		// thus this sets registers 0x24-0x33, 0x34-0x43, etc. in one transfer
-		for ( int j = 0; j < 16; j++ )
-		{
+		for ( int j = 0; j < 16; j++ ) {
 			g_twi_transfer_buffer[1 + j] = pwm_buffer[i + j];
 		}
 
-		//Transmit buffer until succesful
-		//while(i2c_transmit(addr << 1, g_twi_transfer_buffer,17) != 0);
-    ret |= i2c_transmit(addr << 1, g_twi_transfer_buffer, 17);
+    #if ISSI_PERSISTENCE > 0
+      for (uint8_t i = 0; i < ISSI_PERSISTENCE; i++) {
+        if (i2c_transmit(addr << 1, g_twi_transfer_buffer, 17, ISSI_TIMEOUT) == 0)
+          break;
+      }
+    #else
+      i2c_transmit(addr << 1, g_twi_transfer_buffer, 17, ISSI_TIMEOUT);
+    #endif
 	}
-  return ret;
 }
 
-uint8_t IS31FL3731_init( uint8_t addr )
+void IS31FL3731_init( uint8_t addr )
 {
-  uint8_t ret = 0;
 	// In order to avoid the LEDs being driven with garbage data
 	// in the LED driver's PWM registers, first enable software shutdown,
 	// then set up the mode and other settings, clear the PWM registers,
 	// then disable software shutdown.
 
 	// select "function register" bank
-	ret |= IS31FL3731_write_register( addr, ISSI_COMMANDREGISTER, ISSI_BANK_FUNCTIONREG );
+	IS31FL3731_write_register( addr, ISSI_COMMANDREGISTER, ISSI_BANK_FUNCTIONREG );
 
 	// enable software shutdown
-	ret |= IS31FL3731_write_register( addr, ISSI_REG_SHUTDOWN, 0x00 );
+	IS31FL3731_write_register( addr, ISSI_REG_SHUTDOWN, 0x00 );
 	// this delay was copied from other drivers, might not be needed
 	_delay_ms( 10 );
 
 	// picture mode
-	ret |= IS31FL3731_write_register( addr, ISSI_REG_CONFIG, ISSI_REG_CONFIG_PICTUREMODE );
+	IS31FL3731_write_register( addr, ISSI_REG_CONFIG, ISSI_REG_CONFIG_PICTUREMODE );
 	// display frame 0
-	ret |= IS31FL3731_write_register( addr, ISSI_REG_PICTUREFRAME, 0x00 );
+	IS31FL3731_write_register( addr, ISSI_REG_PICTUREFRAME, 0x00 );
 	// audio sync off
-	ret |= IS31FL3731_write_register( addr, ISSI_REG_AUDIOSYNC, 0x00 );
+	IS31FL3731_write_register( addr, ISSI_REG_AUDIOSYNC, 0x00 );
 
 	// select bank 0
-	ret |= IS31FL3731_write_register( addr, ISSI_COMMANDREGISTER, 0 );
+	IS31FL3731_write_register( addr, ISSI_COMMANDREGISTER, 0 );
 
 	// turn off all LEDs in the LED control register
 	for ( int i = 0x00; i <= 0x11; i++ )
 	{
-		ret |= IS31FL3731_write_register( addr, i, 0x00 );
+		IS31FL3731_write_register( addr, i, 0x00 );
 	}
 
 	// turn off all LEDs in the blink control register (not really needed)
 	for ( int i = 0x12; i <= 0x23; i++ )
 	{
-		ret |= IS31FL3731_write_register( addr, i, 0x00 );
+		IS31FL3731_write_register( addr, i, 0x00 );
 	}
 
 	// set PWM on all LEDs to 0
 	for ( int i = 0x24; i <= 0xB3; i++ )
 	{
-		ret |= IS31FL3731_write_register( addr, i, 0x00 );
+		IS31FL3731_write_register( addr, i, 0x00 );
 	}
 
 	// select "function register" bank
-	ret |= IS31FL3731_write_register( addr, ISSI_COMMANDREGISTER, ISSI_BANK_FUNCTIONREG );
+	IS31FL3731_write_register( addr, ISSI_COMMANDREGISTER, ISSI_BANK_FUNCTIONREG );
 
 	// disable software shutdown
-	ret |= IS31FL3731_write_register( addr, ISSI_REG_SHUTDOWN, 0x01 );
+	IS31FL3731_write_register( addr, ISSI_REG_SHUTDOWN, 0x01 );
 
 	// select bank 0 and leave it selected.
 	// most usage after initialization is just writing PWM buffers in bank 0
 	// as there's not much point in double-buffering
-	ret |= IS31FL3731_write_register( addr, ISSI_COMMANDREGISTER, 0 );
+	IS31FL3731_write_register( addr, ISSI_COMMANDREGISTER, 0 );
 
-  return ret;
 }
 
 void IS31FL3731_set_color( int index, uint8_t red, uint8_t green, uint8_t blue )


@@ 224,32 236,27 @@ void IS31FL3731_set_led_control_register( uint8_t index, bool red, bool green, b
 
 	g_led_control_registers_update_required = true;
 
-
 }
 
-uint8_t IS31FL3731_update_pwm_buffers( uint8_t addr1, uint8_t addr2 )
+void IS31FL3731_update_pwm_buffers( uint8_t addr1, uint8_t addr2 )
 {
-  uint8_t ret = 0;
 	if ( g_pwm_buffer_update_required )
 	{
-		ret |= IS31FL3731_write_pwm_buffer( addr1, g_pwm_buffer[0] );
-		ret |= IS31FL3731_write_pwm_buffer( addr2, g_pwm_buffer[1] );
+		IS31FL3731_write_pwm_buffer( addr1, g_pwm_buffer[0] );
+		IS31FL3731_write_pwm_buffer( addr2, g_pwm_buffer[1] );
 	}
 	g_pwm_buffer_update_required = false;
-  return ret;
 }
 
-uint8_t IS31FL3731_update_led_control_registers( uint8_t addr1, uint8_t addr2 )
+void IS31FL3731_update_led_control_registers( uint8_t addr1, uint8_t addr2 )
 {
-  uint8_t ret = 0;
 	if ( g_led_control_registers_update_required )
 	{
 		for ( int i=0; i<18; i++ )
 		{
-			ret |= IS31FL3731_write_register(addr1, i, g_led_control_registers[0][i] );
-			ret |= IS31FL3731_write_register(addr2, i, g_led_control_registers[1][i] );
+			IS31FL3731_write_register(addr1, i, g_led_control_registers[0][i] );
+			IS31FL3731_write_register(addr2, i, g_led_control_registers[1][i] );
 		}
 	}
-  return ret;
 }
 

@@ 31,9 31,9 @@ typedef struct is31_led {
 
 extern const is31_led g_is31_leds[DRIVER_LED_TOTAL];
 
-uint8_t IS31FL3731_init( uint8_t addr );
-uint8_t IS31FL3731_write_register( uint8_t addr, uint8_t reg, uint8_t data );
-uint8_t IS31FL3731_write_pwm_buffer( uint8_t addr, uint8_t *pwm_buffer );
+void IS31FL3731_init( uint8_t addr );
+void IS31FL3731_write_register( uint8_t addr, uint8_t reg, uint8_t data );
+void IS31FL3731_write_pwm_buffer( uint8_t addr, uint8_t *pwm_buffer );
 
 void IS31FL3731_set_color( int index, uint8_t red, uint8_t green, uint8_t blue );
 void IS31FL3731_set_color_all( uint8_t red, uint8_t green, uint8_t blue );


@@ 44,8 44,8 @@ void IS31FL3731_set_led_control_register( uint8_t index, bool red, bool green, b
 // (eg. from a timer interrupt).
 // Call this while idle (in between matrix scans).
 // If the buffer is dirty, it will update the driver with the buffer.
-uint8_t IS31FL3731_update_pwm_buffers( uint8_t addr1, uint8_t addr2 );
-uint8_t IS31FL3731_update_led_control_registers( uint8_t addr1, uint8_t addr2 );
+void IS31FL3731_update_pwm_buffers( uint8_t addr1, uint8_t addr2 );
+void IS31FL3731_update_led_control_registers( uint8_t addr1, uint8_t addr2 );
 
 #define C1_1  0x24
 #define C1_2  0x25

@@ 138,6 138,4 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 //#define NO_ACTION_FUNCTION
 //#define DEBUG_MATRIX_SCAN_RATE
 
-#define I2C_TIMEOUT 1000
-
 #endif

@@ 24,7 24,7 @@ extern inline void ergodox_led_all_set(uint8_t n);
 
 
 bool i2c_initialized = 0;
-uint8_t mcp23018_status = 0x20;
+i2c_status_t mcp23018_status = 0x20;
 
 void matrix_init_kb(void) {
    // keyboard LEDs (see "PWM on ports OC1(A|B|C)" in "teensy-2-0.md")


@@ 125,23 125,23 @@ uint8_t init_mcp23018(void) {
     // - unused  : input  : 1
     // - input   : input  : 1
     // - driving : output : 0
-    mcp23018_status = i2c_start(I2C_ADDR_WRITE);    if (mcp23018_status) goto out;
-    mcp23018_status = i2c_write(IODIRA);            if (mcp23018_status) goto out;
-    mcp23018_status = i2c_write(0b00000000);        if (mcp23018_status) goto out;
-    mcp23018_status = i2c_write(0b00111111);        if (mcp23018_status) goto out;
-    i2c_stop();
+    mcp23018_status = i2c_start(I2C_ADDR_WRITE, 0);    if (mcp23018_status) goto out;
+    mcp23018_status = i2c_write(IODIRA, 0);            if (mcp23018_status) goto out;
+    mcp23018_status = i2c_write(0b00000000, 0);        if (mcp23018_status) goto out;
+    mcp23018_status = i2c_write(0b00111111, 0);        if (mcp23018_status) goto out;
+    i2c_stop(0);
 
     // set pull-up
     // - unused  : on  : 1
     // - input   : on  : 1
     // - driving : off : 0
-    mcp23018_status = i2c_start(I2C_ADDR_WRITE);    if (mcp23018_status) goto out;
-    mcp23018_status = i2c_write(GPPUA);             if (mcp23018_status) goto out;
-    mcp23018_status = i2c_write(0b00000000);        if (mcp23018_status) goto out;
-    mcp23018_status = i2c_write(0b00111111);        if (mcp23018_status) goto out;
+    mcp23018_status = i2c_start(I2C_ADDR_WRITE, 0);    if (mcp23018_status) goto out;
+    mcp23018_status = i2c_write(GPPUA, 0);             if (mcp23018_status) goto out;
+    mcp23018_status = i2c_write(0b00000000, 0);        if (mcp23018_status) goto out;
+    mcp23018_status = i2c_write(0b00111111, 0);        if (mcp23018_status) goto out;
 
 out:
-    i2c_stop();
+    i2c_stop(0);
 
 #ifdef LEFT_LEDS
     if (!mcp23018_status) mcp23018_status = ergodox_left_leds_update();


@@ 165,22 165,22 @@ uint8_t ergodox_left_leds_update(void) {
     // - unused  : hi-Z : 1
     // - input   : hi-Z : 1
     // - driving : hi-Z : 1
-    mcp23018_status = i2c_start(I2C_ADDR_WRITE);
+    mcp23018_status = i2c_start(I2C_ADDR_WRITE, 0);
     if (mcp23018_status) goto out;
-    mcp23018_status = i2c_write(OLATA);
+    mcp23018_status = i2c_write(OLATA, 0);
     if (mcp23018_status) goto out;
     mcp23018_status = i2c_write(0b11111111
-                                & ~(ergodox_left_led_3<<LEFT_LED_3_SHIFT)
-                                );
+                                & ~(ergodox_left_led_3<<LEFT_LED_3_SHIFT),
+                                0);
     if (mcp23018_status) goto out;
     mcp23018_status = i2c_write(0b11111111
                                 & ~(ergodox_left_led_2<<LEFT_LED_2_SHIFT)
-                                & ~(ergodox_left_led_1<<LEFT_LED_1_SHIFT)
-                                );
+                                & ~(ergodox_left_led_1<<LEFT_LED_1_SHIFT),
+                                0);
     if (mcp23018_status) goto out;
 
  out:
-    i2c_stop();
+    i2c_stop(0);
     return mcp23018_status;
 }
 #endif

@@ 23,7 23,7 @@
 #define OLATA           0x14            // output latch register
 #define OLATB           0x15
 
-extern uint8_t mcp23018_status;
+extern i2c_status_t mcp23018_status;
 
 void init_ergodox(void);
 void ergodox_blink_all_leds(void);

@@ 295,13 295,13 @@ static matrix_row_t read_cols(uint8_t row)
             return 0;
         } else {
             uint8_t data = 0;
-            mcp23018_status = i2c_start(I2C_ADDR_WRITE);    if (mcp23018_status) goto out;
-            mcp23018_status = i2c_write(GPIOB);             if (mcp23018_status) goto out;
-            mcp23018_status = i2c_start(I2C_ADDR_READ);     if (mcp23018_status) goto out;
-            data = i2c_read_nack();
-            data = ~data;
+            mcp23018_status = i2c_start(I2C_ADDR_WRITE, 0);    if (mcp23018_status) goto out;
+            mcp23018_status = i2c_write(GPIOB, 0);             if (mcp23018_status) goto out;
+            mcp23018_status = i2c_start(I2C_ADDR_READ, 0);     if (mcp23018_status) goto out;
+            mcp23018_status = i2c_read_nack(0);                if (mcp23018_status < 0) goto out;
+            data = ~((uint8_t)mcp23018_status);
         out:
-            i2c_stop();
+            i2c_stop(0);
             return data;
         }
     } else {


@@ 350,11 350,11 @@ static void select_row(uint8_t row)
         } else {
             // set active row low  : 0
             // set other rows hi-Z : 1
-            mcp23018_status = i2c_start(I2C_ADDR_WRITE);        if (mcp23018_status) goto out;
-            mcp23018_status = i2c_write(GPIOA);                 if (mcp23018_status) goto out;
-            mcp23018_status = i2c_write(0xFF & ~(1<<row));      if (mcp23018_status) goto out;
+            mcp23018_status = i2c_start(I2C_ADDR_WRITE, 0);        if (mcp23018_status) goto out;
+            mcp23018_status = i2c_write(GPIOA, 0);                 if (mcp23018_status) goto out;
+            mcp23018_status = i2c_write(0xFF & ~(1<<row), 0);      if (mcp23018_status) goto out;
         out:
-            i2c_stop();
+            i2c_stop(0);
         }
     } else {
         // select on teensy

@@ 102,13 102,8 @@ void map_row_column_to_led( uint8_t row, uint8_t column, uint8_t *led_i, uint8_t
 }
 
 void rgb_matrix_update_pwm_buffers(void) {
-    uint8_t ret = IS31FL3731_update_pwm_buffers( DRIVER_ADDR_1, DRIVER_ADDR_2 );
-    ret |= IS31FL3731_update_led_control_registers( DRIVER_ADDR_1, DRIVER_ADDR_2 );
-    if (ret == 2) {
-      wait_ms(1000);
-      i2c_stop();
-      rgb_matrix_setup_drivers();
-    }
+    IS31FL3731_update_pwm_buffers( DRIVER_ADDR_1, DRIVER_ADDR_2 );
+    IS31FL3731_update_led_control_registers( DRIVER_ADDR_1, DRIVER_ADDR_2 );
 }
 
 void rgb_matrix_set_color( int index, uint8_t red, uint8_t green, uint8_t blue ) {