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emc_18xx_43xx.c
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1 /*
2  * @brief LPC18xx/43xx EMC driver
3  *
4  * @note
5  * Copyright(C) NXP Semiconductors, 2012
6  * All rights reserved.
7  *
8  * @par
9  * Software that is described herein is for illustrative purposes only
10  * which provides customers with programming information regarding the
11  * LPC products. This software is supplied "AS IS" without any warranties of
12  * any kind, and NXP Semiconductors and its licensor disclaim any and
13  * all warranties, express or implied, including all implied warranties of
14  * merchantability, fitness for a particular purpose and non-infringement of
15  * intellectual property rights. NXP Semiconductors assumes no responsibility
16  * or liability for the use of the software, conveys no license or rights under any
17  * patent, copyright, mask work right, or any other intellectual property rights in
18  * or to any products. NXP Semiconductors reserves the right to make changes
19  * in the software without notification. NXP Semiconductors also makes no
20  * representation or warranty that such application will be suitable for the
21  * specified use without further testing or modification.
22  *
23  * @par
24  * Permission to use, copy, modify, and distribute this software and its
25  * documentation is hereby granted, under NXP Semiconductors' and its
26  * licensor's relevant copyrights in the software, without fee, provided that it
27  * is used in conjunction with NXP Semiconductors microcontrollers. This
28  * copyright, permission, and disclaimer notice must appear in all copies of
29  * this code.
30  */
31 
32 #include "emc_18xx_43xx.h"
33 
34 /*****************************************************************************
35  * Private types/enumerations/variables
36  ****************************************************************************/
37 
38 /*****************************************************************************
39  * Public types/enumerations/variables
40  ****************************************************************************/
41 
42 /*****************************************************************************
43  * Private functions
44  ****************************************************************************/
45 
46 /*****************************************************************************
47  * Public functions
48  ****************************************************************************/
49 
50 /* Dyanmic memory setup */
52 {
53  uint32_t ClkFreq;
54  uint32_t EMCDiv;
55 
56  /* Note clocks must be enabled prior to this call */
57  ClkFreq = Chip_Clock_GetRate(CLK_MX_EMC);
58 
59  /* EMC Divider readback at pos 27
60  TODO: just checked but dont mention in UM */
61  EMCDiv = (LPC_CCU1->CLKCCU[CLK_MX_EMC_DIV].CFG >> 27) & 0x07;
62 
63  /* Check EMC Divider to get real EMC clock out */
64  if ((EMCDiv == 1) && (LPC_CREG->CREG6 & (1 << 16))) {
65  ClkFreq >>= 1;
66  }
67 
68  IP_EMC_Dynamic_Init(LPC_EMC, Dynamic_Config, ClkFreq);
69 }
70 
71 /* Static memory setup */
73 {
74  uint32_t ClkFreq;
75  uint32_t EMCDiv;
76 
77  /* Note clocks must be enabled prior to this call */
78  ClkFreq = Chip_Clock_GetRate(CLK_MX_EMC);
79 
80  /* EMC Divider readback at pos 27 */
81  EMCDiv = (LPC_CCU1->CLKCCU[CLK_MX_EMC_DIV].CFG >> 27) & 0x07;
82 
83  /* Check EMC Divider to get real EMC clock out */
84  if ((EMCDiv == 1) && (LPC_CREG->CREG6 & (1 << 16))) {
85  ClkFreq >>= 1;
86  }
87 
88  IP_EMC_Static_Init(LPC_EMC, Static_Config, ClkFreq);
89 }