Diff: targets/TARGET_Maxim/TARGET_MAX32630/mxc/i2cs.c

Revision:

157:ff67d9f36b67

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/targets/TARGET_Maxim/TARGET_MAX32630/mxc/i2cs.c	Thu Feb 02 17:01:33 2017 +0000
@@ -0,0 +1,209 @@
+/**
+ * @file
+ * @brief      This file contains the function implementations for the I2CS
+ *             (Inter-Integrated Circuit Slave) peripheral module.
+ */
+/* ****************************************************************************
+ * Copyright (C) 2016 Maxim Integrated Products, Inc., All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included
+ * in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+ * IN NO EVENT SHALL MAXIM INTEGRATED BE LIABLE FOR ANY CLAIM, DAMAGES
+ * OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * Except as contained in this notice, the name of Maxim Integrated
+ * Products, Inc. shall not be used except as stated in the Maxim Integrated
+ * Products, Inc. Branding Policy.
+ *
+ * The mere transfer of this software does not imply any licenses
+ * of trade secrets, proprietary technology, copyrights, patents,
+ * trademarks, maskwork rights, or any other form of intellectual
+ * property whatsoever. Maxim Integrated Products, Inc. retains all
+ * ownership rights.
+ *
+ * $Date: 2016-09-08 18:05:59 -0500 (Thu, 08 Sep 2016) $ 
+ * $Revision: 24332 $
+ *
+ *************************************************************************** */
+
+/* **** Includes **** */
+#include <string.h>
+#include "mxc_assert.h"
+#include "mxc_errors.h"
+#include "mxc_sys.h"
+#include "i2cs.h"
+
+/**
+ * @ingroup i2cs
+ * @{
+ */
+/* **** Definitions **** */
+
+/* **** Globals ***** */
+
+
+// No Doxygen documentation for the items between here and endcond. 
+/* Clock divider lookup table */
+static const uint32_t clk_div_table[2][8] = {
+ /* I2CS_SPEED_100KHZ */
+    {
+        // 12000000
+        (6 << MXC_F_I2CS_CLK_DIV_FS_FILTER_CLOCK_DIV_POS),
+        // 24000000
+        (12 << MXC_F_I2CS_CLK_DIV_FS_FILTER_CLOCK_DIV_POS),
+        // 36000000 NOT SUPPORTED
+        0,
+        // 48000000
+        (24 << MXC_F_I2CS_CLK_DIV_FS_FILTER_CLOCK_DIV_POS),
+        // 60000000 NOT SUPPORTED
+        0,
+        // 72000000 NOT SUPPORTED
+        0,
+        // 84000000 NOT SUPPORTED
+        0,
+        // 96000000
+        (48 << MXC_F_I2CS_CLK_DIV_FS_FILTER_CLOCK_DIV_POS)
+    },
+    /* I2CS_SPEED_400KHZ */
+    {
+        // 12000000
+        (2 << MXC_F_I2CS_CLK_DIV_FS_FILTER_CLOCK_DIV_POS),
+        // 24000000
+        (3 << MXC_F_I2CS_CLK_DIV_FS_FILTER_CLOCK_DIV_POS),
+        // 36000000 NOT SUPPORTED
+        0,
+        // 48000000
+        (6 << MXC_F_I2CS_CLK_DIV_FS_FILTER_CLOCK_DIV_POS),
+        // 60000000 NOT SUPPORTED
+        0,
+        // 72000000 NOT SUPPORTED
+        0,
+        // 84000000 NOT SUPPORTED
+        0,
+        // 96000000
+        (12 << MXC_F_I2CS_CLK_DIV_FS_FILTER_CLOCK_DIV_POS)
+    },
+};
+
+
+static void (*callbacks[MXC_CFG_I2CS_INSTANCES][MXC_CFG_I2CS_BUFFER_SIZE])(uint8_t);
+
+/* **** Functions **** */
+
+/* ************************************************************************* */
+int I2CS_Init(mxc_i2cs_regs_t *i2cs, const sys_cfg_i2cs_t *sys_cfg, i2cs_speed_t speed, 
+    uint16_t address, i2cs_addr_t addr_len)
+{
+    int err, i, i2cs_index;
+
+    i2cs_index = MXC_I2CS_GET_IDX(i2cs);
+    MXC_ASSERT(i2cs_index >= 0);
+
+     // Set system level configurations
+    if ((err = SYS_I2CS_Init(i2cs, sys_cfg)) != E_NO_ERROR) {
+        return err;
+    }
+
+    // Compute clock array index
+    int clki = ((SYS_I2CS_GetFreq(i2cs) / 12000000) - 1);
+
+    // Get clock divider settings from lookup table
+    if ((speed == I2CS_SPEED_100KHZ) && (clk_div_table[I2CS_SPEED_100KHZ][clki] > 0)) {
+        i2cs->clk_div = clk_div_table[I2CS_SPEED_100KHZ][clki];
+    } else if ((speed == I2CS_SPEED_400KHZ) && (clk_div_table[I2CS_SPEED_400KHZ][clki] > 0)) {
+        i2cs->clk_div = clk_div_table[I2CS_SPEED_400KHZ][clki];
+    } else {
+        MXC_ASSERT_FAIL();
+    }
+
+    // Clear the interrupt callbacks
+    for(i = 0; i < MXC_CFG_I2CS_BUFFER_SIZE; i++) {
+        callbacks[i2cs_index][i] = NULL;
+    }
+
+    // Reset module
+    i2cs->dev_id = MXC_F_I2CS_DEV_ID_SLAVE_RESET;
+    i2cs->dev_id = ((((address >> 0) << MXC_F_I2CS_DEV_ID_SLAVE_DEV_ID_POS) 
+        & MXC_F_I2CS_DEV_ID_SLAVE_DEV_ID) | addr_len);
+
+    return E_NO_ERROR;
+}
+
+/* ************************************************************************* */
+int I2CS_Shutdown(mxc_i2cs_regs_t *i2cs)
+{
+   int err;
+
+   // Disable and clear interrupts
+   i2cs->inten = 0;
+   i2cs->intfl = i2cs->intfl;
+
+   // clears system level configurations
+   if ((err = SYS_I2CS_Shutdown(i2cs)) != E_NO_ERROR) {
+       return err;
+   }
+
+   return E_NO_ERROR;
+}
+
+/* ************************************************************************* */
+void I2CS_Handler(mxc_i2cs_regs_t *i2cs)
+{
+    uint32_t intfl;
+    uint8_t i;
+    int i2cs_index = MXC_I2CS_GET_IDX(i2cs);
+
+    // Save and clear the interrupt flags
+    intfl = i2cs->intfl;
+    i2cs->intfl = intfl;
+
+    // Process each interrupt
+    for(i = 0; i < 32; i++) {
+        if(intfl & (0x1 << i)) {
+            if(callbacks[i2cs_index][i] != NULL) {
+                callbacks[i2cs_index][i](i);
+            }
+        }
+    }
+
+}
+
+/* ************************************************************************* */
+void I2CS_RegisterCallback(mxc_i2cs_regs_t *i2cs, uint8_t addr, i2cs_callback_fn callback)
+{
+    int i2cs_index = MXC_I2CS_GET_IDX(i2cs);
+
+    // Make sure we don't overflow
+    MXC_ASSERT(addr < MXC_CFG_I2CS_BUFFER_SIZE);
+
+    if(callback != NULL) {
+        // Save the callback address
+        callbacks[i2cs_index][addr] = callback;
+
+        // Clear and Enable the interrupt for the given byte
+        i2cs->intfl = (0x1 << addr);
+        i2cs->inten |= (0x1 << addr);
+    } else {
+        // Disable and clear the interrupt
+        i2cs->inten &= ~(0x1 << addr);
+        i2cs->intfl = (0x1 << addr);
+
+        // Clear the callback address
+        callbacks[i2cs_index][addr] = NULL;
+    }
+}
+
+/**@} end of group i2cs*/