/*
ChibiOS/RT - Copyright (C) 2006-2013 Giovanni Di Sirio
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
/**
* @defgroup AVR_DRIVERS AVR Drivers
* @details This section describes all the supported drivers on the AVR
* platform and the implementation details of the single drivers.
*
* @ingroup platforms
*/
/**
* @defgroup AVR_HAL AVR Initialization Support
* @details On the AVR platform the HAL driver is a stub and does not perform
* any platform-specific initialization, it still performs the
* initialization of the other drivers.
*
* @ingroup AVR_DRIVERS
*/
/**
* @defgroup AVR_PAL AVR PAL Support
* @details The AVR PAL driver uses the PORT peripherals.
*
* @section avr_pal_1 Supported HW resources
* - PORTA.
* - PORTB.
* - PORTC.
* - PORTD.
* - PORTE.
* - PORTF.
* - PORTG.
* .
* @section avr_pal_2 AVR PAL driver implementation features
* The AVR PAL driver implementation fully supports the following hardware
* capabilities:
* - 8 bits wide ports.
* - Atomic set/reset functions.
* - Output latched regardless of the pad setting.
* - Direct read of input pads regardless of the pad setting.
* .
* @section avr_pal_3 Supported PAL setup modes
* The AVR PAL driver supports the following I/O modes:
* - @p PAL_MODE_RESET.
* - @p PAL_MODE_UNCONNECTED.
* - @p PAL_MODE_INPUT.
* - @p PAL_MODE_INPUT_PULLUP.
* - @p PAL_MODE_INPUT_ANALOG.
* - @p PAL_MODE_OUTPUT_PUSHPULL.
* .
* Any attempt to setup an invalid mode is ignored.
*
* @section avr_pal_4 Suboptimal behavior
* The AVR PORT is less than optimal in several areas, the limitations
* should be taken in account while using the PAL driver:
* - Pad/port toggling operations are not atomic.
* - Pad/group mode setup is not atomic.
* - Group set+reset function is not atomic.
* - Writing on pads/groups/ports programmed as input with pull-up
* resistor changes the resistor setting because the output latch is
* used for resistor selection.
* - The PORT registers layout on some devices is not regular (it does
* not have contiguous PIN, DDR, PORT registers in this order), such
* ports cannot be accessed using the PAL driver. For example, PORT F
* on ATmega128. Verify the user manual of your device.
* .
* @ingroup AVR_DRIVERS
*/
/**
* @defgroup AVR_SERIAL AVR Serial Support
* @details The AVR Serial driver uses the USART peripherals in a
* buffered, interrupt driven, implementation.
*
* @section avr_serial_1 Supported HW resources
* The serial driver can support any of the following hardware resources:
* - USART0.
* - USART1.
* .
* @section avr_serial_2 AVR Serial driver implementation features
* - Each USART can be independently enabled and programmed.
* - Fully interrupt driven.
* .
* @ingroup AVR_DRIVERS
*/
/**
* @defgroup AVR_ADC AVR ADC Support
* @details The AVR ADC driver uses the ADC and ADCMUX peripherals
* in an interrupt driven, one-shot or multiple shot implementation.
*
* @section avr_adc Supported HW resources
* The i2c driver can support the following hardware resource:
* - ADC.
* .
* @ingroup AVR_DRIVERS
*/
/**
* @defgroup AVR_I2C AVR I2C Support
* @details The AVR I2C driver uses the TWI peripheral in an interrupt
* driven, implementation.
*
* @section avr_i2c Supported HW resources
* The i2c driver can support the following hardware resource:
* - I2C.
* .
* @ingroup AVR_DRIVERS
*/
/**
* @defgroup AVR_SPI AVR SPI Support
* @details The AVR SPI driver uses the SPI peripheral (USART in SPI mode
* is not supported). It works as an interrupt driven implementation but
* a polled mode is available for 8 bit or 16 bit messages. Both master
* and slave mode are supported.
*
* @section avr_spi Supported HW resources
* The spi driver can support the following hardware resource:
* - SPI.
* .
* @ingroup AVR_DRIVERS
*/
42'>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
|