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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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 | /* pinmux_board_arduino_due.c - Arduino Due pinmux driver */ /* * Copyright (c) 2016 Intel Corporation * * 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. */ #include <device.h> #include <init.h> #include <nanokernel.h> #include <pinmux.h> #include <soc.h> #include <sys_io.h> #include "pinmux/pinmux.h" /** * @brief Pinmux driver for Arduino due * * The SAM3X8E on Arduion Due has 4 PIO controllers. These controllers * are responsible for pin muxing, input/output, pull-up, etc. * * All PIO controller pins are flatten into sequentially incrementing * pin numbers: * Pins 0 - 31 are for PIOA * Pins 32 - 63 are for PIOB * Pins 64 - 95 are for PIOC * Pins 96 - 127 are for PIOD * * For all the pin descriptions, refer to the Atmel datasheet, and * the Arduino Due schematics. */ /* * These is the mapping from the board pins to PIO controllers. * This mapping is created from the Arduino Due schematics. * Refer to the official schematics for the actual mapping, * as the following may not be accurate. * * IO_0 : PA8 * IO_1 : PA9 * IO_2 : PB25 * IO_3 : PC28 * IO_4 : PA29 * IO_5 : PC25 * IO_6 : PC24 * IO_7 : PC23 * * IO_8 : PC22 * IO_9 : PC21 * IO_10 : PA28 and PC29 * IO_11 : PD7 * IO_12 : PD8 * IO_13 : PB27 * SDA1 : PA17 * SCL1 : PA18 * * IO_14 : PD4 * IO_15 : PD5 * IO_16 : PA13 * IO_17 : PA12 * IO_18 : PA11 * IO_19 : PA10 * IO_20 : PB12 * IO_21 : PB13 * * A_0 : PA16 * A_1 : PA24 * A_2 : PA23 * A_3 : PA22 * A_4 : PA6 * A_5 : PA4 * A_6 : PA3 * A_7 : PA2 * * A_8 : PB17 * A_9 : PB18 * A_10 : PB19 * A_11 : PB20 * DAC0 : PB15 * DAC1 : PB16 * CANRX : PA1 * CANTX : PA0 * * IO_22 : PB26 * IO_23 : PA14 * IO_24 : PA15 * IO_25 : PD0 * IO_26 : PD1 * IO_27 : PD2 * IO_28 : PD3 * IO_29 : PD6 * IO_30 : PD9 * IO_31 : PA7 * IO_32 : PD10 * IO_33 : PC1 * IO_34 : PC2 * IO_35 : PC3 * IO_36 : PC4 * IO_37 : PC5 * IO_38 : PC6 * IO_39 : PC7 * IO_40 : PC8 * IO_41 : PC9 * IO_42 : PA19 * IO_43 : PA20 * IO_44 : PC19 * IO_45 : PC18 * IO_46 : PC17 * IO_47 : PC16 * IO_48 : PC15 * IO_49 : PC14 * IO_50 : PC13 * IO_51 : PC12 */ #define N_PIOA 0 #define N_PIOB 1 #define N_PIOC 2 #define N_PIOD 3 /* * This function sets the default for the following: * - Pin mux (peripheral A or B) * - Set pin as input or output * - Enable pull-up for pins * * At boot, all pins are outputs with pull-up enabled, and are set to be * peripheral A (with value 0). So only the peripherals that need to be * set to B (value 1) will be declared explicitly below. * * Note that all pins are set to be controlled by the PIO controllers * by default. For peripherals to work (e.g. UART), the PIO has to * be disabled for that pin (e.g. UART to take over those pins). */ static void __pinmux_defaults(void) { uint32_t ab_select[4]; /* A/B selection */ uint32_t output_en[4]; /* output enabled */ uint32_t pull_up[4]; /* pull-up enabled */ uint32_t pio_ctrl[4]; /* PIO enable */ uint32_t tmp; /* Read defaults at boot, as the bootloader may have already * configured some pins. */ ab_select[N_PIOA] = __PIOA->absr; ab_select[N_PIOB] = __PIOB->absr; ab_select[N_PIOC] = __PIOC->absr; ab_select[N_PIOD] = __PIOD->absr; output_en[N_PIOA] = __PIOA->osr; output_en[N_PIOB] = __PIOB->osr; output_en[N_PIOC] = __PIOC->osr; output_en[N_PIOD] = __PIOD->osr; pio_ctrl[N_PIOA] = __PIOA->psr; pio_ctrl[N_PIOB] = __PIOB->psr; pio_ctrl[N_PIOC] = __PIOC->psr; pio_ctrl[N_PIOD] = __PIOD->psr; /* value 1 means pull-up disabled, so need to invert */ pull_up[N_PIOA] = ~(__PIOA->pusr); pull_up[N_PIOB] = ~(__PIOB->pusr); pull_up[N_PIOC] = ~(__PIOC->pusr); pull_up[N_PIOD] = ~(__PIOD->pusr); /* * Now modify as we wish */ /* Make sure JTAG pins are used for JTAG */ pio_ctrl[N_PIOB] &= ~(BIT(28) | BIT(29) | BIT(30) | BIT(31)); /* UART console: * IO_0: PA8 (RX) * IO_1: PA9 (TX) */ pio_ctrl[N_PIOA] &= ~(BIT(8) | BIT(9)); /* I2C pins on TWI controller #0 * * SDA1: PA17 * SCL1: PA18 * * Note that these need external pull-up resistors. */ pio_ctrl[N_PIOA] &= ~(BIT(17) | BIT(18)); /* I2C pins on TWI controller #1 * * IO_20: PB12 (SDA) * IO_21: PB13 (SCL) * * Board already have pull-up resistors. */ pio_ctrl[N_PIOB] &= ~(BIT(12) | BIT(13)); /* * Setup ADC pins. * * Note that the ADC is considered extra function * for the pins (other than A or B). This extra * pin function is enabled by enabling the ADC * controller. Therefore, the following code * only sets these pins as input, with pull-up * disabled. This does not detach the PIO * controller from the pins so the peripherals * won't take over. * * A_0 : PA16 * A_1 : PA24 * A_2 : PA23 * A_3 : PA22 * A_4 : PA6 * A_5 : PA4 * A_6 : PA3 * A_7 : PA2 * * A_8 : PB17 * A_9 : PB18 * A_10: PB19 * A_11: PB20 */ tmp = BIT(16) | BIT(24) | BIT(23) | BIT(22) | BIT(6) | BIT(4) | BIT(3) | BIT(2); pio_ctrl[N_PIOA] |= tmp; output_en[N_PIOA] &= ~(tmp); pull_up[N_PIOA] &= ~(tmp); tmp = BIT(17) | BIT(18) | BIT(19) | BIT(20); pio_ctrl[N_PIOB] |= tmp; output_en[N_PIOB] &= ~(tmp); pull_up[N_PIOB] &= ~(tmp); /* * Write modifications back to those registers */ __PIOA->absr = ab_select[N_PIOA]; __PIOB->absr = ab_select[N_PIOB]; __PIOC->absr = ab_select[N_PIOC]; __PIOD->absr = ab_select[N_PIOD]; /* set output enable */ __PIOA->oer = output_en[N_PIOA]; __PIOB->oer = output_en[N_PIOB]; __PIOC->oer = output_en[N_PIOC]; __PIOD->oer = output_en[N_PIOD]; /* set output disable */ __PIOA->odr = ~(output_en[N_PIOA]); __PIOB->odr = ~(output_en[N_PIOB]); __PIOC->odr = ~(output_en[N_PIOC]); __PIOD->odr = ~(output_en[N_PIOD]); /* set PIO enable */ __PIOA->per = pio_ctrl[N_PIOA]; __PIOB->per = pio_ctrl[N_PIOB]; __PIOC->per = pio_ctrl[N_PIOC]; __PIOD->per = pio_ctrl[N_PIOD]; /* set PIO disable */ __PIOA->pdr = ~(pio_ctrl[N_PIOA]); __PIOB->pdr = ~(pio_ctrl[N_PIOB]); __PIOC->pdr = ~(pio_ctrl[N_PIOC]); __PIOD->pdr = ~(pio_ctrl[N_PIOD]); /* set pull-up enable */ __PIOA->puer = pull_up[N_PIOA]; __PIOB->puer = pull_up[N_PIOB]; __PIOC->puer = pull_up[N_PIOC]; __PIOD->puer = pull_up[N_PIOD]; /* set pull-up disable */ __PIOA->pudr = ~(pull_up[N_PIOA]); __PIOB->pudr = ~(pull_up[N_PIOB]); __PIOC->pudr = ~(pull_up[N_PIOC]); __PIOD->pudr = ~(pull_up[N_PIOD]); } static int pinmux_init(struct device *port) { ARG_UNUSED(port); __pinmux_defaults(); return 0; } SYS_INIT(pinmux_init, PRIMARY, CONFIG_KERNEL_INIT_PRIORITY_DEFAULT); |