LPCOpen Platform  v1.03
LPCOpen Platform for NXP LPC Microcontrollers
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sdc_17xx_40xx.c
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1 /*
2  * @brief LPC17xx/40xx SD card 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 #if !defined(CHIP_LPC175X_6X)
35 
36 /*****************************************************************************
37  * Private types/enumerations/variables
38  ****************************************************************************/
39 
40 /*****************************************************************************
41  * Public types/enumerations/variables
42  ****************************************************************************/
43 
44 /*****************************************************************************
45  * Private functions
46  ****************************************************************************/
47 
48 /*****************************************************************************
49  * Public functions
50  ****************************************************************************/
51 
52 /* Initializes the SDC card controller */
53 void Chip_SDC_Init(LPC_SDC_T *pSDC)
54 {
55  uint32_t i = 0;
56  Chip_Clock_EnablePeriphClock(SYSCTL_CLOCK_SDC);
57  Chip_SYSCTL_PeriphReset(SYSCTL_RESET_PCSDC);
58 
59  /* Initialize GPDMA controller */
60  Chip_GPDMA_Init(LPC_GPDMA);
61 
62  /* Initialize SDC peripheral */
63  IP_SDC_Init(pSDC);
64 
65  /* Power-up SDC Peripheral */
66  IP_SDC_PowerControl(pSDC, SDC_POWER_UP, 0);
67 
68  /* delays for the supply output is stable*/
69  for ( i = 0; i < 0x80000; i++ ) {}
70 
71  Chip_SDC_SetClock(pSDC, SDC_IDENT_CLOCK_RATE);
72  IP_SDC_ClockControl(pSDC, SDC_CLOCK_ENABLE, ENABLE);
73 
74  /* Power-on SDC Interface */
75  IP_SDC_PowerControl(pSDC, SDC_POWER_ON, 0);
76 
77 }
78 
79 /* Set SD_CLK Clock */
80 void Chip_SDC_SetClock(LPC_SDC_T *pSDC, uint32_t freq)
81 {
82  uint32_t PClk;
83  uint32_t ClkValue = 0;
84 
85  PClk = Chip_Clock_GetPeripheralClockRate();
86 
87  ClkValue = (PClk + 2 * freq - 1) / (2 * freq);
88  if (ClkValue > 0) {
89  ClkValue -= 1;
90  }
91  IP_SDC_SetClockDiv(pSDC, ClkValue);
92 }
93 
94 /* Shutdown the SDC card controller */
95 void Chip_SDC_DeInit(LPC_SDC_T *pSDC)
96 {
97  IP_SDC_DeInit(pSDC);
98  Chip_Clock_DisablePeriphClock(SYSCTL_CLOCK_SDC);
99 }
100 
101 #endif /* !defined(CHIP_LPC175X_6X) */