Diff: source/family/arm/musca_b/syscon.c

Revision:

0:01f31e923fe2

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/source/family/arm/musca_b/syscon.c	Tue Apr 07 12:55:42 2020 +0200
@@ -0,0 +1,215 @@
+/**
+ * @file    syscon.c
+ * @brief   System Controller serial interface
+ *
+ * DAPLink Interface Firmware
+ * Copyright (c) 2008-2019, ARM Limited, All Rights Reserved
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may
+ * not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <ctype.h>                                // character functions
+#include <string.h>                               // string and memory functions
+
+#include "IO_Config_Override.h"                   // I/O pin definitions
+
+#include "syscon.h"                               // SCC interface
+
+// SYSCON timing
+#define TSUH            2                         // Clock setup and hold
+#define TCLK            2                         // Clock high time
+
+// Misc defines
+#define GPIOIMSK        0x003F                    // GPIOI SCC bit mask
+
+/*----------------------------------------------------------------------------
+  System Controller serial interface
+ *----------------------------------------------------------------------------*/
+static void Sleepns(uint32_t cycles)
+{
+    volatile uint32_t i = cycles;        // fudge factor to give approximate 1 ns
+
+    while (i > 0) {
+        i--;
+    }
+}
+/*----------------------------------------------------------------------------
+  System Controller 32bit register read (16uS)
+ *----------------------------------------------------------------------------*/
+void syscon_readreg(unsigned int addr, unsigned int *din)
+{
+    volatile unsigned int loop, data;
+
+    // Write the 12bit address value
+    for(loop = 0; loop < 12; loop++)
+    {
+        if (addr & 0x800)
+        {
+            LPC_GPIO->SET[PIN_SCC_DATAIN_PORT] = PIN_SCC_DATAIN;
+        }
+        else
+        {
+            LPC_GPIO->CLR[PIN_SCC_DATAIN_PORT] = PIN_SCC_DATAIN;
+        }
+        Sleepns(TCLK);
+        LPC_GPIO->SET[PIN_SCC_CLK_PORT] = PIN_SCC_CLK;
+        Sleepns(TCLK);
+        LPC_GPIO->CLR[PIN_SCC_CLK_PORT] = PIN_SCC_CLK;
+        // Set next address bit
+        addr = (addr << 1) & 0xFFF;
+    }
+
+    LPC_GPIO->CLR[PIN_SCC_DATAIN_PORT] = PIN_SCC_DATAIN;
+    Sleepns(TCLK);
+
+    // Config load
+    LPC_GPIO->SET[PIN_SCC_LOAD_PORT] = PIN_SCC_LOAD;
+    Sleepns(TCLK * 2);
+    LPC_GPIO->SET[PIN_SCC_CLK_PORT] = PIN_SCC_CLK;
+    Sleepns(TCLK * 3);
+    LPC_GPIO->CLR[PIN_SCC_CLK_PORT] = PIN_SCC_CLK;
+    LPC_GPIO->CLR[PIN_SCC_LOAD_PORT] = PIN_SCC_LOAD;
+    Sleepns(TCLK * 2);
+
+    // Read the 32bit data value
+    data = 0;
+
+    for (loop = 0; loop < 4; loop++)
+    {
+        data = (data >> 8) & 0x00FFFFFF;
+        Sleepns(TCLK);
+        LPC_GPIO->SET[PIN_SCC_CLK_PORT] = PIN_SCC_CLK;
+        Sleepns(TCLK * 2);
+        LPC_GPIO->CLR[PIN_SCC_CLK_PORT] = PIN_SCC_CLK;
+        Sleepns(TCLK);
+        data |= ((LPC_GPIO->PIN[PIN_SCC_DATAOUT_PORT] & PIN_SCC_DATAOUT) << (24 - PIN_SCC_DATAOUT_BIT));
+        Sleepns(TCLK);
+        LPC_GPIO->SET[PIN_SCC_CLK_PORT] = PIN_SCC_CLK;
+        Sleepns(TCLK * 2);
+        LPC_GPIO->CLR[PIN_SCC_CLK_PORT] = PIN_SCC_CLK;
+        Sleepns(TCLK);
+        data |= ((LPC_GPIO->PIN[PIN_SCC_DATAOUT_PORT] & PIN_SCC_DATAOUT) << (25 - PIN_SCC_DATAOUT_BIT));
+        Sleepns(TCLK);
+        LPC_GPIO->SET[PIN_SCC_CLK_PORT] = PIN_SCC_CLK;
+        Sleepns(TCLK * 2);
+        LPC_GPIO->CLR[PIN_SCC_CLK_PORT] = PIN_SCC_CLK;
+        Sleepns(TCLK);
+        data |= ((LPC_GPIO->PIN[PIN_SCC_DATAOUT_PORT] & PIN_SCC_DATAOUT) << (26 - PIN_SCC_DATAOUT_BIT));
+        Sleepns(TCLK);
+        LPC_GPIO->SET[PIN_SCC_CLK_PORT] = PIN_SCC_CLK;
+        Sleepns(TCLK * 2);
+        LPC_GPIO->CLR[PIN_SCC_CLK_PORT] = PIN_SCC_CLK;
+        Sleepns(TCLK);
+        data |= ((LPC_GPIO->PIN[PIN_SCC_DATAOUT_PORT] & PIN_SCC_DATAOUT) << (27 - PIN_SCC_DATAOUT_BIT));
+        Sleepns(TCLK);
+        LPC_GPIO->SET[PIN_SCC_CLK_PORT] = PIN_SCC_CLK;
+        Sleepns(TCLK * 2);
+        LPC_GPIO->CLR[PIN_SCC_CLK_PORT] = PIN_SCC_CLK;
+        Sleepns(TCLK);
+        data |= ((LPC_GPIO->PIN[PIN_SCC_DATAOUT_PORT] & PIN_SCC_DATAOUT) << (28 - PIN_SCC_DATAOUT_BIT));
+        Sleepns(TCLK);
+        LPC_GPIO->SET[PIN_SCC_CLK_PORT] = PIN_SCC_CLK;
+        Sleepns(TCLK * 2);
+        LPC_GPIO->CLR[PIN_SCC_CLK_PORT] = PIN_SCC_CLK;
+        Sleepns(TCLK);
+        data |= ((LPC_GPIO->PIN[PIN_SCC_DATAOUT_PORT] & PIN_SCC_DATAOUT) << (29 - PIN_SCC_DATAOUT_BIT));
+        Sleepns(TCLK);
+        LPC_GPIO->SET[PIN_SCC_CLK_PORT] = PIN_SCC_CLK;
+        Sleepns(TCLK * 2);
+        LPC_GPIO->CLR[PIN_SCC_CLK_PORT] = PIN_SCC_CLK;
+        Sleepns(TCLK);
+        data |= ((LPC_GPIO->PIN[PIN_SCC_DATAOUT_PORT] & PIN_SCC_DATAOUT) << (30 - PIN_SCC_DATAOUT_BIT));
+        Sleepns(TCLK);
+        LPC_GPIO->SET[PIN_SCC_CLK_PORT] = PIN_SCC_CLK;
+        Sleepns(TCLK * 2);
+        LPC_GPIO->CLR[PIN_SCC_CLK_PORT] = PIN_SCC_CLK;
+        Sleepns(TCLK);
+        data |= ((LPC_GPIO->PIN[PIN_SCC_DATAOUT_PORT] & PIN_SCC_DATAOUT) << (31 - PIN_SCC_DATAOUT_BIT));
+        Sleepns(TCLK);
+    }
+
+    // Return the 32bit data value
+    *din = data;
+}
+
+/*----------------------------------------------------------------------------
+  System Controller 32bit register write (20uS)
+ *----------------------------------------------------------------------------*/
+void syscon_writereg(unsigned int addr, unsigned int dout)
+{
+    volatile unsigned int loop, data;
+
+    // Set write enable
+    LPC_GPIO->SET[PIN_SCC_WNR_PORT] = PIN_SCC_WNR;
+
+    // Write the 12bit address value
+    for(loop = 0; loop < 12; loop++)
+    {
+        if (addr & 0x800)
+        {
+            LPC_GPIO->SET[PIN_SCC_DATAIN_PORT] = PIN_SCC_DATAIN;
+        }
+        else
+        {
+            LPC_GPIO->CLR[PIN_SCC_DATAIN_PORT] = PIN_SCC_DATAIN;
+        }
+        Sleepns(TCLK);
+        LPC_GPIO->SET[PIN_SCC_CLK_PORT] = PIN_SCC_CLK;
+        Sleepns(TCLK);
+        LPC_GPIO->CLR[PIN_SCC_CLK_PORT] = PIN_SCC_CLK;
+        // Set next address bit
+        addr = (addr << 1) & 0xFFF;
+    }
+
+    LPC_GPIO->CLR[PIN_SCC_DATAIN_PORT] = PIN_SCC_DATAIN;
+    Sleepns(TCLK);
+
+    // Write the 32bit data value
+    data  = dout;
+    for (loop = 0; loop < 32; loop++)
+    {
+        if (data & 0x80000000)
+        {
+            LPC_GPIO->SET[PIN_SCC_DATAIN_PORT] = PIN_SCC_DATAIN;
+        }
+        else
+        {
+            LPC_GPIO->CLR[PIN_SCC_DATAIN_PORT] = PIN_SCC_DATAIN;
+        }
+        Sleepns(TCLK);
+        LPC_GPIO->SET[PIN_SCC_CLK_PORT] = PIN_SCC_CLK;
+        Sleepns(TCLK);
+        LPC_GPIO->CLR[PIN_SCC_CLK_PORT] = PIN_SCC_CLK;
+        // Set next address bit
+        data = (data << 1);
+        Sleepns(TCLK);
+    }
+
+    LPC_GPIO->CLR[PIN_SCC_DATAIN_PORT] = PIN_SCC_DATAIN;
+    Sleepns(TCLK);
+
+    // Config load
+    LPC_GPIO->SET[PIN_SCC_LOAD_PORT] = PIN_SCC_LOAD;
+    Sleepns(TCLK * 2);
+    LPC_GPIO->SET[PIN_SCC_CLK_PORT] = PIN_SCC_CLK;
+    Sleepns(TCLK * 3);
+    LPC_GPIO->CLR[PIN_SCC_CLK_PORT] = PIN_SCC_CLK;
+    LPC_GPIO->CLR[PIN_SCC_LOAD_PORT] = PIN_SCC_LOAD;
+    Sleepns(TCLK * 2);
+
+    // Set to read
+    LPC_GPIO->CLR[PIN_SCC_WNR_PORT] = PIN_SCC_WNR;
+}
+
+// end of syscon.c