| LPCOpen Platform v1.03 LPCOpen Platform for NXP LPC Microcontrollers

- Main Page
- Modules
- Data Structures
- Files
- Related Pages

- File List
- Globals

All Data Structures Files Functions Variables Typedefs Enumerations Enumerator Macros Groups Pages
enet_17xx_40xx.c
Go to the documentation of this file.
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 }