Diff: targets/TARGET_ONSEMI/TARGET_NCS36510/i2c_api.c

Revision:

149:156823d33999

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/targets/TARGET_ONSEMI/TARGET_NCS36510/i2c_api.c	Fri Oct 28 11:17:30 2016 +0100
@@ -0,0 +1,184 @@
+/**
+ *******************************************************************************
+ * @file    i2c.c
+ * @brief Implementation of an i2c api
+ * @internal
+ * @author  ON Semiconductor
+ * $Rev: 3525 $
+ * $Date: 2015-07-20 15:24:25 +0530 (Mon, 20 Jul 2015) $
+ ******************************************************************************
+ * Copyright 2016 Semiconductor Components Industries LLC (d/b/a “ON Semiconductor”).
+ * All rights reserved.  This software and/or documentation is licensed by ON Semiconductor
+ * under limited terms and conditions.  The terms and conditions pertaining to the software
+ * and/or documentation are available at http://www.onsemi.com/site/pdf/ONSEMI_T&C.pdf
+ * (“ON Semiconductor Standard Terms and Conditions of Sale, Section 8 Software”) and
+ * if applicable the software license agreement.  Do not use this software and/or
+ * documentation unless you have carefully read and you agree to the limited terms and
+ * conditions.  By using this software and/or documentation, you agree to the limited
+ * terms and conditions.
+ *
+ * THIS SOFTWARE IS PROVIDED "AS IS".  NO WARRANTIES, WHETHER EXPRESS, IMPLIED
+ * OR STATUTORY, INCLUDING, BUT NOT LIMITED TO, IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE APPLY TO THIS SOFTWARE.
+ * ON SEMICONDUCTOR SHALL NOT, IN ANY CIRCUMSTANCES, BE LIABLE FOR SPECIAL,
+ * INCIDENTAL, OR CONSEQUENTIAL DAMAGES, FOR ANY REASON WHATSOEVER.
+ * @endinternal
+ *
+ * @ingroup i2c
+ *
+ */
+#if DEVICE_I2C
+
+#include "i2c.h"
+#include "i2c_api.h"
+
+#define I2C_READ_WRITE_BIT_MASK    0xFE
+
+/* See i2c_api.h for details */
+void i2c_init(i2c_t *obj, PinName sda, PinName scl)
+{
+    fI2cInit(obj, sda, scl);
+}
+
+/* See i2c_api.h for details */
+void i2c_frequency(i2c_t *obj, int hz)
+{
+    fI2cFrequency(obj, hz);
+}
+
+/* See i2c_api.h for details */
+int i2c_start(i2c_t *obj)
+{
+    return(fI2cStart(obj));
+}
+
+/* See i2c_api.h for details */
+int i2c_stop(i2c_t *obj)
+{
+    return(fI2cStop(obj));
+}
+
+/* See i2c_api.h for details */
+int i2c_read(i2c_t *obj, int address, char *data, int length, int stop)
+{
+    /* TODO address parameter not usable */
+    int Count, status;
+    const char WriteData = (address | (~I2C_READ_WRITE_BIT_MASK)) & 0xFF;
+
+    /* Send  start bit */
+    status = fI2cStart(obj);
+    if(status) {
+        /* Error sending start bit */
+        return status;
+    }
+
+    /* Send address | read */
+    Count = fI2cWriteB(obj, &WriteData, 1);
+    if(Count != 1) {
+        /* Error sending address */
+        return Count;
+    }
+
+    /* Send command/s */
+    Count = fI2cReadB(obj, data, length);
+    if(Count != length) {
+        /* Error sending coomand/s */
+        return Count;
+    }
+    if(stop) {    /* Send stop bit if requested */
+        status = fI2cStop(obj);
+        if(status) {
+            /* Error sending stop bit */
+            return status;
+        }
+    }
+    return Count;
+}
+
+/* See i2c_api.h for details */
+int i2c_write(i2c_t *obj, int address, const char *data, int length, int stop)
+{
+    int Count, status;
+    const char WriteData = (address & I2C_READ_WRITE_BIT_MASK) & 0xFF;
+
+    /* Send start bit */
+    status = fI2cStart(obj);
+    if(status) {
+        /* Error sending start bit */
+        return status;
+    }
+
+    /* Send address | write */
+    Count = fI2cWriteB(obj, &WriteData, 1);
+    if(Count != 1) {
+        /* Error sending address */
+        return Count;
+    }
+
+    /* Sens command, [data] */
+    Count = fI2cWriteB(obj, data, length);
+    if(Count != length) {
+        /* Error sending address */
+        return Count;
+    }
+
+    if(stop) {    /* If stop requested */
+        /* Send stop bit */
+        status = fI2cStop(obj);
+        if(status) {
+            /* Error sending stop bit */
+            return status;
+        }
+    }
+    return Count;
+}
+
+/* See i2c_api.h for details */
+void i2c_reset(i2c_t *obj)
+{
+    (void)fI2cStop(obj);
+}
+
+/* See i2c_api.h for details */
+int i2c_byte_read(i2c_t *obj, int last) /* TODO return size can be uint8_t */
+{
+    int Count;
+    char data;
+    Count = fI2cReadB(obj, &data, 1);
+    if(Count != 1) {
+        /* Error */
+        return Count;
+    }
+    if(last) {
+        /* ACK */
+        obj->membase->CMD_REG = I2C_CMD_WDAT0;
+    } else {
+        /* No ACK */
+        obj->membase->CMD_REG = I2C_CMD_WDAT1;
+    }
+    return data;
+}
+
+/* See i2c_api.h for details */
+int i2c_byte_write(i2c_t *obj, int data)
+{
+    int Count;
+    Count = fI2cWriteB(obj, (const char *)&data, 1);
+    if(Count != 1) {
+        return Count;
+    }
+
+    obj->membase->CMD_REG = I2C_CMD_VRFY_ACK; /* Verify ACK */
+
+    while(obj->membase->STATUS.WORD & I2C_STATUS_CMD_FIFO_OFL_BIT); /* Wait till command overflow ends */
+
+    if(obj->membase->STATUS.WORD & I2C_STATUS_BUS_ERR_BIT) {
+        /* Bus error means NAK received */
+        return 0;
+    } else {
+        /* ACK received */
+        return 1;
+    }
+}
+
+#endif /* DEVICE_I2C */