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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) */