1 /**************************************************************************//**
2 * @file ebi.c
3 * @version V3.00
4 * @brief M480 series External Bus Interface(EBI) driver source file
5 *
6 * SPDX-License-Identifier: Apache-2.0
7 * @copyright (C) 2016-2020 Nuvoton Technology Corp. All rights reserved.
8 *****************************************************************************/
9 #include "NuMicro.h"
10
11 /** @addtogroup Standard_Driver Standard Driver
12 @{
13 */
14
15 /** @addtogroup EBI_Driver EBI Driver
16 @{
17 */
18
19
20 /** @addtogroup EBI_EXPORTED_FUNCTIONS EBI Exported Functions
21 @{
22 */
23
24 /**
25 * @brief Initialize EBI for specify Bank
26 *
27 * @param[in] u32Bank Bank number for EBI. Valid values are:
28 * - \ref EBI_BANK0
29 * - \ref EBI_BANK1
30 * - \ref EBI_BANK2
31 * @param[in] u32DataWidth Data bus width. Valid values are:
32 * - \ref EBI_BUSWIDTH_8BIT
33 * - \ref EBI_BUSWIDTH_16BIT
34 * @param[in] u32TimingClass Default timing configuration. Valid values are:
35 * - \ref EBI_TIMING_FASTEST
36 * - \ref EBI_TIMING_VERYFAST
37 * - \ref EBI_TIMING_FAST
38 * - \ref EBI_TIMING_NORMAL
39 * - \ref EBI_TIMING_SLOW
40 * - \ref EBI_TIMING_VERYSLOW
41 * - \ref EBI_TIMING_SLOWEST
42 * @param[in] u32BusMode Set EBI bus operate mode. Valid values are:
43 * - \ref EBI_OPMODE_NORMAL
44 * - \ref EBI_OPMODE_CACCESS
45 * - \ref EBI_OPMODE_ADSEPARATE
46 * @param[in] u32CSActiveLevel CS is active High/Low. Valid values are:
47 * - \ref EBI_CS_ACTIVE_HIGH
48 * - \ref EBI_CS_ACTIVE_LOW
49 *
50 * @return None
51 *
52 * @details This function is used to open specify EBI bank with different bus width, timing setting and \n
53 * active level of CS pin to access EBI device.
54 * @note Write Buffer Enable(WBUFEN) and Extend Time Of ALE(TALE) are only available in EBI bank0 control register.
55 */
EBI_Open(uint32_t u32Bank,uint32_t u32DataWidth,uint32_t u32TimingClass,uint32_t u32BusMode,uint32_t u32CSActiveLevel)56 void EBI_Open(uint32_t u32Bank, uint32_t u32DataWidth, uint32_t u32TimingClass, uint32_t u32BusMode, uint32_t u32CSActiveLevel)
57 {
58 uint32_t u32Index0 = (uint32_t)&EBI->CTL0 + (uint32_t)u32Bank * 0x10U;
59 uint32_t u32Index1 = (uint32_t)&EBI->TCTL0 + (uint32_t)u32Bank * 0x10U;
60 volatile uint32_t *pu32EBICTL = (uint32_t *)( u32Index0 );
61 volatile uint32_t *pu32EBITCTL = (uint32_t *)( u32Index1 );
62
63 if(u32DataWidth == EBI_BUSWIDTH_8BIT)
64 {
65 *pu32EBICTL &= ~EBI_CTL_DW16_Msk;
66 }
67 else
68 {
69 *pu32EBICTL |= EBI_CTL_DW16_Msk;
70 }
71
72 *pu32EBICTL |= u32BusMode;
73
74 switch(u32TimingClass)
75 {
76 case EBI_TIMING_FASTEST:
77 *pu32EBICTL = (*pu32EBICTL & ~(EBI_CTL_MCLKDIV_Msk | EBI_CTL_TALE_Msk)) |
78 (EBI_MCLKDIV_1 << EBI_CTL_MCLKDIV_Pos) |
79 (u32CSActiveLevel << EBI_CTL_CSPOLINV_Pos) | EBI_CTL_EN_Msk;
80 *pu32EBITCTL = 0x0U;
81 break;
82
83 case EBI_TIMING_VERYFAST:
84 *pu32EBICTL = (*pu32EBICTL & ~(EBI_CTL_MCLKDIV_Msk | EBI_CTL_TALE_Msk)) |
85 (EBI_MCLKDIV_1 << EBI_CTL_MCLKDIV_Pos) |
86 (u32CSActiveLevel << EBI_CTL_CSPOLINV_Pos) | EBI_CTL_EN_Msk |
87 (0x3U << EBI_CTL_TALE_Pos) ;
88 *pu32EBITCTL = 0x03003318U;
89 break;
90
91 case EBI_TIMING_FAST:
92 *pu32EBICTL = (*pu32EBICTL & ~(EBI_CTL_MCLKDIV_Msk | EBI_CTL_TALE_Msk)) |
93 (EBI_MCLKDIV_2 << EBI_CTL_MCLKDIV_Pos) |
94 (u32CSActiveLevel << EBI_CTL_CSPOLINV_Pos) | EBI_CTL_EN_Msk;
95 *pu32EBITCTL = 0x0U;
96 break;
97
98 case EBI_TIMING_NORMAL:
99 *pu32EBICTL = (*pu32EBICTL & ~(EBI_CTL_MCLKDIV_Msk | EBI_CTL_TALE_Msk)) |
100 (EBI_MCLKDIV_2 << EBI_CTL_MCLKDIV_Pos) |
101 (u32CSActiveLevel << EBI_CTL_CSPOLINV_Pos) | EBI_CTL_EN_Msk |
102 (0x3U << EBI_CTL_TALE_Pos) ;
103 *pu32EBITCTL = 0x03003318U;
104 break;
105
106 case EBI_TIMING_SLOW:
107 *pu32EBICTL = (*pu32EBICTL & ~(EBI_CTL_MCLKDIV_Msk | EBI_CTL_TALE_Msk)) |
108 (EBI_MCLKDIV_2 << EBI_CTL_MCLKDIV_Pos) |
109 (u32CSActiveLevel << EBI_CTL_CSPOLINV_Pos) | EBI_CTL_EN_Msk |
110 (0x7U << EBI_CTL_TALE_Pos) ;
111 *pu32EBITCTL = 0x07007738U;
112 break;
113
114 case EBI_TIMING_VERYSLOW:
115 *pu32EBICTL = (*pu32EBICTL & ~(EBI_CTL_MCLKDIV_Msk | EBI_CTL_TALE_Msk)) |
116 (EBI_MCLKDIV_4 << EBI_CTL_MCLKDIV_Pos) |
117 (u32CSActiveLevel << EBI_CTL_CSPOLINV_Pos) | EBI_CTL_EN_Msk |
118 (0x7U << EBI_CTL_TALE_Pos) ;
119 *pu32EBITCTL = 0x07007738U;
120 break;
121
122 case EBI_TIMING_SLOWEST:
123 *pu32EBICTL = (*pu32EBICTL & ~(EBI_CTL_MCLKDIV_Msk | EBI_CTL_TALE_Msk)) |
124 (EBI_MCLKDIV_8 << EBI_CTL_MCLKDIV_Pos) |
125 (u32CSActiveLevel << EBI_CTL_CSPOLINV_Pos) | EBI_CTL_EN_Msk |
126 (0x7U << EBI_CTL_TALE_Pos) ;
127 *pu32EBITCTL = 0x07007738U;
128 break;
129
130 default:
131 *pu32EBICTL &= ~EBI_CTL_EN_Msk;
132 break;
133 }
134 }
135
136 /**
137 * @brief Disable EBI on specify Bank
138 *
139 * @param[in] u32Bank Bank number for EBI. Valid values are:
140 * - \ref EBI_BANK0
141 * - \ref EBI_BANK1
142 * - \ref EBI_BANK2
143 *
144 * @return None
145 *
146 * @details This function is used to close specify EBI function.
147 */
EBI_Close(uint32_t u32Bank)148 void EBI_Close(uint32_t u32Bank)
149 {
150 uint32_t u32Index = (uint32_t)&EBI->CTL0 + u32Bank * 0x10U;
151 volatile uint32_t *pu32EBICTL = (uint32_t *)( u32Index );
152
153 *pu32EBICTL &= ~EBI_CTL_EN_Msk;
154 }
155
156 /**
157 * @brief Set EBI Bus Timing for specify Bank
158 *
159 * @param[in] u32Bank Bank number for EBI. Valid values are:
160 * - \ref EBI_BANK0
161 * - \ref EBI_BANK1
162 * - \ref EBI_BANK2
163 * @param[in] u32TimingConfig Configure EBI timing settings, includes TACC, TAHD, W2X and R2R setting.
164 * @param[in] u32MclkDiv Divider for MCLK. Valid values are:
165 * - \ref EBI_MCLKDIV_1
166 * - \ref EBI_MCLKDIV_2
167 * - \ref EBI_MCLKDIV_4
168 * - \ref EBI_MCLKDIV_8
169 * - \ref EBI_MCLKDIV_16
170 * - \ref EBI_MCLKDIV_32
171 * - \ref EBI_MCLKDIV_64
172 * - \ref EBI_MCLKDIV_128
173 *
174 * @return None
175 *
176 * @details This function is used to configure specify EBI bus timing for access EBI device.
177 */
EBI_SetBusTiming(uint32_t u32Bank,uint32_t u32TimingConfig,uint32_t u32MclkDiv)178 void EBI_SetBusTiming(uint32_t u32Bank, uint32_t u32TimingConfig, uint32_t u32MclkDiv)
179 {
180 uint32_t u32Index0 = (uint32_t)&EBI->CTL0 + (uint32_t)u32Bank * 0x10U;
181 uint32_t u32Index1 = (uint32_t)&EBI->TCTL0 + (uint32_t)u32Bank * 0x10U;
182 volatile uint32_t *pu32EBICTL = (uint32_t *)( u32Index0 );
183 volatile uint32_t *pu32EBITCTL = (uint32_t *)( u32Index1 );
184
185 *pu32EBICTL = (*pu32EBICTL & ~EBI_CTL_MCLKDIV_Msk) | (u32MclkDiv << EBI_CTL_MCLKDIV_Pos);
186 *pu32EBITCTL = u32TimingConfig;
187 }
188
189 /*@}*/ /* end of group EBI_EXPORTED_FUNCTIONS */
190
191 /*@}*/ /* end of group EBI_Driver */
192
193 /*@}*/ /* end of group Standard_Driver */
194
195 /*** (C) COPYRIGHT 2016 Nuvoton Technology Corp. ***/
196
