1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
|
/*
* Copyright (c) 2006-2021, RT-Thread Development Team
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author Notes
* 2020-06-22 bigmagic first version
*/
#include <rtthread.h>
#include <rthw.h>
#include <rtdevice.h>
#include "raspi4.h"
#include "drv_spi.h"
#ifdef RT_USING_SPI
#define RPI_CORE_CLK_HZ (500 * 1000 * 1000)
#define SPITIMEOUT 0x0FFF
static rt_uint8_t raspi_byte_reverse_table[] =
{
0x00, 0x80, 0x40, 0xc0, 0x20, 0xa0, 0x60, 0xe0,
0x10, 0x90, 0x50, 0xd0, 0x30, 0xb0, 0x70, 0xf0,
0x08, 0x88, 0x48, 0xc8, 0x28, 0xa8, 0x68, 0xe8,
0x18, 0x98, 0x58, 0xd8, 0x38, 0xb8, 0x78, 0xf8,
0x04, 0x84, 0x44, 0xc4, 0x24, 0xa4, 0x64, 0xe4,
0x14, 0x94, 0x54, 0xd4, 0x34, 0xb4, 0x74, 0xf4,
0x0c, 0x8c, 0x4c, 0xcc, 0x2c, 0xac, 0x6c, 0xec,
0x1c, 0x9c, 0x5c, 0xdc, 0x3c, 0xbc, 0x7c, 0xfc,
0x02, 0x82, 0x42, 0xc2, 0x22, 0xa2, 0x62, 0xe2,
0x12, 0x92, 0x52, 0xd2, 0x32, 0xb2, 0x72, 0xf2,
0x0a, 0x8a, 0x4a, 0xca, 0x2a, 0xaa, 0x6a, 0xea,
0x1a, 0x9a, 0x5a, 0xda, 0x3a, 0xba, 0x7a, 0xfa,
0x06, 0x86, 0x46, 0xc6, 0x26, 0xa6, 0x66, 0xe6,
0x16, 0x96, 0x56, 0xd6, 0x36, 0xb6, 0x76, 0xf6,
0x0e, 0x8e, 0x4e, 0xce, 0x2e, 0xae, 0x6e, 0xee,
0x1e, 0x9e, 0x5e, 0xde, 0x3e, 0xbe, 0x7e, 0xfe,
0x01, 0x81, 0x41, 0xc1, 0x21, 0xa1, 0x61, 0xe1,
0x11, 0x91, 0x51, 0xd1, 0x31, 0xb1, 0x71, 0xf1,
0x09, 0x89, 0x49, 0xc9, 0x29, 0xa9, 0x69, 0xe9,
0x19, 0x99, 0x59, 0xd9, 0x39, 0xb9, 0x79, 0xf9,
0x05, 0x85, 0x45, 0xc5, 0x25, 0xa5, 0x65, 0xe5,
0x15, 0x95, 0x55, 0xd5, 0x35, 0xb5, 0x75, 0xf5,
0x0d, 0x8d, 0x4d, 0xcd, 0x2d, 0xad, 0x6d, 0xed,
0x1d, 0x9d, 0x5d, 0xdd, 0x3d, 0xbd, 0x7d, 0xfd,
0x03, 0x83, 0x43, 0xc3, 0x23, 0xa3, 0x63, 0xe3,
0x13, 0x93, 0x53, 0xd3, 0x33, 0xb3, 0x73, 0xf3,
0x0b, 0x8b, 0x4b, 0xcb, 0x2b, 0xab, 0x6b, 0xeb,
0x1b, 0x9b, 0x5b, 0xdb, 0x3b, 0xbb, 0x7b, 0xfb,
0x07, 0x87, 0x47, 0xc7, 0x27, 0xa7, 0x67, 0xe7,
0x17, 0x97, 0x57, 0xd7, 0x37, 0xb7, 0x77, 0xf7,
0x0f, 0x8f, 0x4f, 0xcf, 0x2f, 0xaf, 0x6f, 0xef,
0x1f, 0x9f, 0x5f, 0xdf, 0x3f, 0xbf, 0x7f, 0xff
};
#if defined (BSP_USING_SPI0_BUS)
#define SPI0_BUS_NAME "spi0"
#define SPI0_DEVICE0_NAME "spi0.0"
#define SPI0_DEVICE1_NAME "spi0.1"
struct rt_spi_bus spi0_bus;
#if defined (BSP_USING_SPI0_DEVICE0)
static struct rt_spi_device spi0_device0;
#endif
#if defined (BSP_USING_SPI0_DEVICE1)
static struct rt_spi_device spi0_device1;
#endif
#endif
static rt_err_t raspi_spi_configure(struct rt_spi_device *device, struct rt_spi_configuration *cfg)
{
RT_ASSERT(cfg != RT_NULL);
RT_ASSERT(device != RT_NULL);
struct raspi_spi_device* hw_config = (struct raspi_spi_device *)(device->parent.user_data);
struct raspi_spi_hw_config *hwcfg = (struct raspi_spi_hw_config *)hw_config->spi_hw_config;
// spi clear fifo
SPI_REG_CS(hwcfg->hw_base) |= (SPI_CS_CLEAR_TX | SPI_CS_CLEAR_RX);
if(cfg->mode & RT_SPI_CPOL)
{
SPI_REG_CS(hwcfg->hw_base) |= SPI_CS_CPOL;
}
else
{
SPI_REG_CS(hwcfg->hw_base) &= ~SPI_CS_CPOL;
}
if(cfg->mode & RT_SPI_CPHA)
{
SPI_REG_CS(hwcfg->hw_base) |= SPI_CS_CPHA;
}else
{
SPI_REG_CS(hwcfg->hw_base) &= ~SPI_CS_CPHA;
}
if(cfg->mode & RT_SPI_CS_HIGH)
{
SPI_REG_CS(hwcfg->hw_base) |= SPI_CS_CSPOL_HIGH;
}
else
{
SPI_REG_CS(hwcfg->hw_base) &= ~SPI_CS_CSPOL_HIGH;
}
return RT_EOK;
}
rt_uint8_t correct_order(rt_uint8_t b, rt_uint8_t flag)
{
if (flag)
return raspi_byte_reverse_table[b];//reverse
else
return b;
}
static rt_err_t spi_transfernb(struct raspi_spi_hw_config *hwcfg, rt_uint8_t* tbuf, rt_uint8_t* rbuf, rt_uint32_t len, rt_uint8_t flag)
{
rt_uint32_t TXCnt=0;
rt_uint32_t RXCnt=0;
/* Use the FIFO's to reduce the interbyte times */
while ((TXCnt < len) || (RXCnt < len))
{
/* TX fifo not full, so add some more bytes */
while (((SPI_REG_CS(hwcfg->hw_base) & SPI_CS_TX_DATA)) && (TXCnt < len))
{
SPI_REG_FIFO(hwcfg->hw_base) = correct_order(tbuf[TXCnt],flag);
TXCnt++;
}
/* Rx fifo not empty, so get the next received bytes */
while (((SPI_REG_CS(hwcfg->hw_base) & SPI_CS_RX_DATA)) && (RXCnt < len))
{
rbuf[RXCnt] = correct_order(SPI_REG_FIFO(hwcfg->hw_base), flag);
RXCnt++;
}
}
/* Wait for DONE to be set */
while (!(SPI_REG_CS(hwcfg->hw_base) & SPI_CS_DONE));
return RT_EOK;
}
static rt_ssize_t raspi_spi_xfer(struct rt_spi_device *device, struct rt_spi_message *message)
{
rt_err_t res;
rt_uint8_t flag;
RT_ASSERT(device != RT_NULL);
RT_ASSERT(device->bus != RT_NULL);
RT_ASSERT(device->parent.user_data != RT_NULL);
RT_ASSERT(message->send_buf != RT_NULL || message->recv_buf != RT_NULL);
struct rt_spi_configuration config = device->config;
struct raspi_spi_device * hw_config = (struct raspi_spi_device *)device->parent.user_data;
GPIO_PIN cs_pin = (GPIO_PIN)hw_config->cs_pin;
struct raspi_spi_hw_config *hwcfg = (struct raspi_spi_hw_config *)hw_config->spi_hw_config;
//mode MSB
if (config.mode & RT_SPI_MSB)
{
flag = 1;
}
else
{
flag = 0;
}
//max_hz
if(config.max_hz == 0)
{
SPI_REG_CLK(hwcfg->hw_base) = 0;
}
else
{
SPI_REG_CLK(hwcfg->hw_base) = (RPI_CORE_CLK_HZ / (config.max_hz));
}
//cs_pin spi0.0
if(cs_pin == GPIO_PIN_8)
{
SPI_REG_CS(hwcfg->hw_base) &= (~(3 << 0));
}
else if(cs_pin == GPIO_PIN_7)//spi0.1
{
SPI_REG_CS(hwcfg->hw_base) |= SPI_CS_CHIP_SELECT_1;
}
//Clear TX and RX fifos
SPI_REG_CS(hwcfg->hw_base) |= (SPI_CS_CLEAR_TX | SPI_CS_CLEAR_RX);
if (message->cs_take)
{
SPI_REG_CS(hwcfg->hw_base) |= SPI_CS_TA;
}
res = spi_transfernb(hwcfg, (rt_uint8_t *)message->send_buf, (rt_uint8_t *)message->recv_buf, (rt_int32_t)message->length, flag);
if (message->cs_release)
{
//Set TA = 0, and also set the barrier
SPI_REG_CS(hwcfg->hw_base) &= (~SPI_CS_TA);
}
if (res != RT_EOK)
return res;
return message->length;
}
rt_err_t raspi_spi_bus_attach_device(const char *bus_name, struct raspi_spi_device *device)
{
rt_err_t ret;
RT_ASSERT(device != RT_NULL);
ret = rt_spi_bus_attach_device(device->spi_device, device->device_name, bus_name, (void *)(device));
return ret;
}
rt_err_t raspi_spi_hw_init(struct raspi_spi_hw_config *hwcfg)
{
prev_raspi_pin_mode(hwcfg->sclk_pin, hwcfg->sclk_mode);
prev_raspi_pin_mode(hwcfg->miso_pin, hwcfg->miso_mode);
prev_raspi_pin_mode(hwcfg->mosi_pin, hwcfg->mosi_mode);
#if defined (BSP_USING_SPI0_DEVICE0)
prev_raspi_pin_mode(hwcfg->ce0_pin, hwcfg->ce0_mode);
#endif
#if defined (BSP_USING_SPI0_DEVICE1)
prev_raspi_pin_mode(hwcfg->ce1_pin, hwcfg->ce1_mode);
#endif
//clear rx and tx
SPI_REG_CS(hwcfg->hw_base) = (SPI_CS_CLEAR_TX | SPI_CS_CLEAR_RX);
return RT_EOK;
}
static struct rt_spi_ops raspi_spi_ops =
{
.configure = raspi_spi_configure,
.xfer = raspi_spi_xfer
};
struct raspi_spi_hw_config raspi_spi0_hw =
{
.spi_num = 0,
.sclk_pin = GPIO_PIN_11,
.sclk_mode = ALT0,
.mosi_pin = GPIO_PIN_10,
.mosi_mode = ALT0,
.miso_pin = GPIO_PIN_9,
.miso_mode = ALT0,
#if defined (BSP_USING_SPI0_DEVICE0)
.ce0_pin = GPIO_PIN_8,
.ce0_mode = ALT0,
#endif
#if defined (BSP_USING_SPI0_DEVICE1)
.ce1_pin = GPIO_PIN_7,
.ce1_mode = ALT0,
#endif
.hw_base = SPI_0_BASE,
};
#endif
#if defined (BSP_USING_SPI0_DEVICE0)
struct raspi_spi_device raspi_spi0_device0 =
{
.device_name = SPI0_DEVICE0_NAME,
.spi_bus = &spi0_bus,
.spi_device = &spi0_device0,
.spi_hw_config = &raspi_spi0_hw,
.cs_pin = GPIO_PIN_8,
};
#endif
#if defined (BSP_USING_SPI0_DEVICE1)
struct raspi_spi_device raspi_spi0_device1 =
{
.device_name = SPI0_DEVICE1_NAME,
.spi_bus = &spi0_bus,
.spi_device = &spi0_device1,
.spi_hw_config = &raspi_spi0_hw,
.cs_pin = GPIO_PIN_7,
};
#endif
int rt_hw_spi_init(void)
{
#if defined (BSP_USING_SPI0_BUS)
raspi_spi_hw_init(&raspi_spi0_hw);
rt_spi_bus_register(&spi0_bus, SPI0_BUS_NAME, &raspi_spi_ops);
#if defined (BSP_USING_SPI0_DEVICE0)
raspi_spi_bus_attach_device(SPI0_BUS_NAME, &raspi_spi0_device0);
#endif
#if defined (BSP_USING_SPI0_DEVICE1)
raspi_spi_bus_attach_device(SPI0_BUS_NAME, &raspi_spi0_device1);
#endif
#endif
return RT_EOK;
}
INIT_DEVICE_EXPORT(rt_hw_spi_init);
|
