refactor, non-working

[qmk_firmware.git] / drivers / avr / i2c_master.c

diff --git a/drivers/avr/i2c_master.c b/drivers/avr/i2c_master.c
index caca2179e0e555a6d93123f5c1e526632411c3f8..30ea760c9ff00bc7e4fb9e8c9837f555d9b2180c 100755 (executable)
--- a/drivers/avr/i2c_master.c
+++ b/drivers/avr/i2c_master.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;
 }