LPCOpen Platform  v1.03
LPCOpen Platform for NXP LPC Microcontrollers
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enet_17xx_40xx.c
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1 /*
2  * @brief LPC17xx/40xx ethernet 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 "chip.h"
33 
34 /*****************************************************************************
35  * Private types/enumerations/variables
36  ****************************************************************************/
37 
38 /* Divider index values for the MII PHY clock */
39 STATIC const uint8_t EnetClkDiv[] = {4, 6, 8, 10, 14, 20, 28, 36, 40, 44,
40  48, 52, 56, 60, 64};
41 
42 /*****************************************************************************
43  * Public types/enumerations/variables
44  ****************************************************************************/
45 
46 /*****************************************************************************
47  * Private functions
48  ****************************************************************************/
49 
50 /*****************************************************************************
51  * Public functions
52  ****************************************************************************/
53 
54 /* Basic Ethernet interface initialization */
55 void Chip_ENET_Init(LPC_ENET_T *pENET)
56 {
57  volatile uint32_t i;
58 
59  /* Enable Ethenet Clock */
60  Chip_Clock_EnablePeriphClock(SYSCTL_CLOCK_ENET);
61 #if !defined(CHIP_LPC175X_6X)
62  Chip_SYSCTL_PeriphReset(SYSCTL_RESET_ENET);
63 #endif
64 
65  /* Reset ethernet peripheral, small delay after reset */
66  Chip_ENET_Reset(pENET);
67  for (i = 0; i < 100; i++) {}
68 
69  IP_ENET_Init(pENET);
70 }
71 
72 /* Find the divider index for a desired MII clock rate */
73 uint32_t Chip_ENET_FindMIIDiv(LPC_ENET_T *pENET, uint32_t clockRate)
74 {
75  uint32_t tmp, divIdx = 0;
76 
77  /* Find desired divider value */
78  tmp = Chip_Clock_GetENETClockRate() / clockRate;
79 
80  /* Determine divider index from desired divider */
81  for (divIdx = 0; divIdx < (sizeof(EnetClkDiv) / sizeof(EnetClkDiv[0])); divIdx++) {
82  /* Closest index, but not higher than desired rate */
83  if (EnetClkDiv[divIdx] >= tmp) {
84  return divIdx;
85  }
86  }
87 
88  /* Use maximum divider index */
89  return (sizeof(EnetClkDiv) / sizeof(EnetClkDiv[0])) - 1;
90 }
91 
92 /* Ethernet interface shutdown */
93 void Chip_ENET_DeInit(LPC_ENET_T *pENET)
94 {
95  IP_ENET_DeInit(pENET);
96  Chip_Clock_DisablePeriphClock(SYSCTL_CLOCK_ENET);
97 }