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   1 /*
   2  * Copyright © 2012 Keith Packard <keithp@keithp.com>
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation; version 2 of the License.
   7  *
   8  * This program is distributed in the hope that it will be useful, but
   9  * WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  11  * General Public License for more details.
  12  *
  13  * You should have received a copy of the GNU General Public License along
  14  * with this program; if not, write to the Free Software Foundation, Inc.,
  15  * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
  16  */
  17
  18 #include <ao.h>
  19
  20 void
  21 ao_debug_out(char c)
  22 {
  23         if (c == '\n')
  24                 ao_debug_out('\r');
  25         while (!(stm_usart1.sr & (1 << STM_USART_SR_TXE)));
  26         stm_usart1.dr = c;
  27 }
  28
  29 static void
  30 _ao_usart_tx_start(struct ao_stm_usart *usart)
  31 {
  32         if (!ao_fifo_empty(usart->tx_fifo) && !usart->tx_started)
  33         {
  34                 usart->tx_started = 1;
  35                 ao_fifo_remove(usart->tx_fifo, usart->reg->dr);
  36         }
  37 }
  38
  39 static void
  40 ao_usart_isr(struct ao_stm_usart *usart, int stdin)
  41 {
  42         uint32_t        sr;
  43
  44         sr = usart->reg->sr;
  45         usart->reg->sr = 0;
  46
  47         if (sr & (1 << STM_USART_SR_RXNE)) {
  48                 char c = usart->reg->dr;
  49                 if (!ao_fifo_full(usart->rx_fifo))
  50                         ao_fifo_insert(usart->rx_fifo, c);
  51                 ao_wakeup(&usart->rx_fifo);
  52                 if (stdin)
  53                         ao_wakeup(&ao_stdin_ready);
  54         }
  55         if (sr & (1 << STM_USART_SR_TC)) {
  56                 usart->tx_started = 0;
  57                 _ao_usart_tx_start(usart);
  58                 ao_wakeup(&usart->tx_fifo);
  59         }
  60 }
  61
  62 char
  63 ao_usart_getchar(struct ao_stm_usart *usart)
  64 {
  65         char c;
  66         ao_arch_block_interrupts();
  67         while (ao_fifo_empty(usart->rx_fifo))
  68                 ao_sleep(&usart->rx_fifo);
  69         ao_fifo_remove(usart->rx_fifo, c);
  70         ao_arch_release_interrupts();
  71         return c;
  72 }
  73
  74 int
  75 ao_usart_pollchar(struct ao_stm_usart *usart)
  76 {
  77         int     c;
  78
  79         ao_arch_block_interrupts();
  80         if (ao_fifo_empty(usart->rx_fifo))
  81                 c = AO_READ_AGAIN;
  82         else {
  83                 uint8_t u;
  84                 ao_fifo_remove(usart->rx_fifo,u);
  85                 c = u;
  86         }
  87         ao_arch_release_interrupts();
  88         return c;
  89 }
  90
  91 void
  92 ao_usart_putchar(struct ao_stm_usart *usart, char c)
  93 {
  94         ao_arch_block_interrupts();
  95         while (ao_fifo_full(usart->tx_fifo))
  96                 ao_sleep(&usart->tx_fifo);
  97         ao_fifo_insert(usart->tx_fifo, c);
  98         _ao_usart_tx_start(usart);
  99         ao_arch_release_interrupts();
 100 }
 101
 102 void
 103 ao_usart_drain(struct ao_stm_usart *usart)
 104 {
 105         ao_arch_block_interrupts();
 106         while (!ao_fifo_empty(usart->tx_fifo))
 107                 ao_sleep(&usart->tx_fifo);
 108         ao_arch_release_interrupts();
 109 }
 110
 111 static const struct {
 112         uint32_t brr;
 113 } ao_usart_speeds[] = {
 114         [AO_SERIAL_SPEED_4800] = {
 115                 AO_PCLK1 / 4800
 116         },
 117         [AO_SERIAL_SPEED_9600] = {
 118                 AO_PCLK1 / 9600
 119         },
 120         [AO_SERIAL_SPEED_19200] = {
 121                 AO_PCLK1 / 19200
 122         },
 123         [AO_SERIAL_SPEED_57600] = {
 124                 AO_PCLK1 / 57600
 125         },
 126         [AO_SERIAL_SPEED_115200] = {
 127                 AO_PCLK1 / 115200
 128         },
 129 };
 130
 131 void
 132 ao_usart_set_speed(struct ao_stm_usart *usart, uint8_t speed)
 133 {
 134         if (speed > AO_SERIAL_SPEED_115200)
 135                 return;
 136         usart->reg->brr = ao_usart_speeds[speed].brr;
 137 }
 138
 139 void
 140 ao_usart_init(struct ao_stm_usart *usart)
 141 {
 142         usart->reg->cr1 = ((0 << STM_USART_CR1_OVER8) |
 143                           (1 << STM_USART_CR1_UE) |
 144                           (0 << STM_USART_CR1_M) |
 145                           (0 << STM_USART_CR1_WAKE) |
 146                           (0 << STM_USART_CR1_PCE) |
 147                           (0 << STM_USART_CR1_PS) |
 148                           (0 << STM_USART_CR1_PEIE) |
 149                           (0 << STM_USART_CR1_TXEIE) |
 150                           (1 << STM_USART_CR1_TCIE) |
 151                           (1 << STM_USART_CR1_RXNEIE) |
 152                           (0 << STM_USART_CR1_IDLEIE) |
 153                           (1 << STM_USART_CR1_TE) |
 154                           (1 << STM_USART_CR1_RE) |
 155                           (0 << STM_USART_CR1_RWU) |
 156                           (0 << STM_USART_CR1_SBK));
 157
 158         usart->reg->cr2 = ((0 << STM_USART_CR2_LINEN) |
 159                           (STM_USART_CR2_STOP_1 << STM_USART_CR2_STOP) |
 160                           (0 << STM_USART_CR2_CLKEN) |
 161                           (0 << STM_USART_CR2_CPOL) |
 162                           (0 << STM_USART_CR2_CPHA) |
 163                           (0 << STM_USART_CR2_LBCL) |
 164                           (0 << STM_USART_CR2_LBDIE) |
 165                           (0 << STM_USART_CR2_LBDL) |
 166                           (0 << STM_USART_CR2_ADD));
 167
 168         usart->reg->cr3 = ((0 << STM_USART_CR3_ONEBITE) |
 169                           (0 << STM_USART_CR3_CTSIE) |
 170                           (0 << STM_USART_CR3_CTSE) |
 171                           (0 << STM_USART_CR3_RTSE) |
 172                           (0 << STM_USART_CR3_DMAT) |
 173                           (0 << STM_USART_CR3_DMAR) |
 174                           (0 << STM_USART_CR3_SCEN) |
 175                           (0 << STM_USART_CR3_NACK) |
 176                           (0 << STM_USART_CR3_HDSEL) |
 177                           (0 << STM_USART_CR3_IRLP) |
 178                           (0 << STM_USART_CR3_IREN) |
 179                           (0 << STM_USART_CR3_EIE));
 180
 181         /* Pick a 9600 baud rate */
 182         ao_usart_set_speed(usart, AO_SERIAL_SPEED_9600);
 183 }
 184
 185 #if HAS_SERIAL_1
 186
 187 struct ao_stm_usart ao_stm_usart1;
 188
 189 void stm_usart1_isr(void) { ao_usart_isr(&ao_stm_usart1, USE_SERIAL_1_STDIN); }
 190
 191 char
 192 ao_serial1_getchar(void)
 193 {
 194         return ao_usart_getchar(&ao_stm_usart1);
 195 }
 196
 197 void
 198 ao_serial1_putchar(char c)
 199 {
 200         ao_usart_putchar(&ao_stm_usart1, c);
 201 }
 202
 203 int
 204 ao_serial1_pollchar(void)
 205 {
 206         return ao_usart_pollchar(&ao_stm_usart1);
 207 }
 208
 209 void
 210 ao_serial1_set_speed(uint8_t speed)
 211 {
 212         ao_usart_set_speed(&ao_stm_usart1, speed);
 213 }
 214 #endif  /* HAS_SERIAL_1 */
 215
 216 #if HAS_SERIAL_2
 217
 218 struct ao_stm_usart ao_stm_usart2;
 219
 220 void stm_usart2_isr(void) { ao_usart_isr(&ao_stm_usart2, USE_SERIAL_2_STDIN); }
 221
 222 char
 223 ao_serial2_getchar(void)
 224 {
 225         return ao_usart_getchar(&ao_stm_usart2);
 226 }
 227
 228 void
 229 ao_serial2_putchar(char c)
 230 {
 231         ao_usart_putchar(&ao_stm_usart2, c);
 232 }
 233
 234 int
 235 ao_serial2_pollchar(void)
 236 {
 237         return ao_usart_pollchar(&ao_stm_usart2);
 238 }
 239
 240 void
 241 ao_serial2_set_speed(uint8_t speed)
 242 {
 243         ao_usart_set_speed(&ao_stm_usart2, speed);
 244 }
 245 #endif  /* HAS_SERIAL_2 */
 246
 247 #if HAS_SERIAL_3
 248
 249 struct ao_stm_usart ao_stm_usart3;
 250
 251 void stm_usart3_isr(void) { ao_usart_isr(&ao_stm_usart3, USE_SERIAL_2_STDIN); }
 252
 253 char
 254 ao_serial3_getchar(void)
 255 {
 256         return ao_usart_getchar(&ao_stm_usart3);
 257 }
 258
 259 void
 260 ao_serial3_putchar(char c)
 261 {
 262         ao_usart_putchar(&ao_stm_usart3, c);
 263 }
 264
 265 int
 266 ao_serial3_pollchar(void)
 267 {
 268         return ao_usart_pollchar(&ao_stm_usart3);
 269 }
 270
 271 void
 272 ao_serial3_set_speed(uint8_t speed)
 273 {
 274         ao_usart_set_speed(&ao_stm_usart3, speed);
 275 }
 276 #endif  /* HAS_SERIAL_3 */
 277
 278 void
 279 ao_serial_init(void)
 280 {
 281 #if HAS_SERIAL_1
 282         /*
 283          *      TX      RX
 284          *      PA9     PA10
 285          *      PB6     PB7     *
 286          */
 287
 288 #if SERIAL_1_PA9_PA10
 289         stm_rcc.ahbenr |= (1 << STM_RCC_AHBENR_GPIOAEN);
 290
 291         stm_afr_set(&stm_gpioa, 9, STM_AFR_AF7);
 292         stm_afr_set(&stm_gpioa, 10, STM_AFR_AF7);
 293 #else
 294 #if SERIAL_1_PB6_PB7
 295         stm_rcc.ahbenr |= (1 << STM_RCC_AHBENR_GPIOBEN);
 296
 297         stm_afr_set(&stm_gpiob, 6, STM_AFR_AF7);
 298         stm_afr_set(&stm_gpiob, 7, STM_AFR_AF7);
 299 #else
 300 #error "No SERIAL_1 port configuration specified"
 301 #endif
 302 #endif
 303         /* Enable USART */
 304         stm_rcc.apb2enr |= (1 << STM_RCC_APB2ENR_USART1EN);
 305
 306         ao_stm_usart1.reg = &stm_usart1;
 307         ao_usart_init(&ao_stm_usart1);
 308
 309         stm_nvic_set_enable(STM_ISR_USART1_POS);
 310         stm_nvic_set_priority(STM_ISR_USART1_POS, 4);
 311 #if USE_SERIAL_1_STDIN
 312         ao_add_stdio(ao_serial1_pollchar,
 313                      ao_serial1_putchar,
 314                      NULL);
 315 #endif
 316 #endif
 317
 318 #if HAS_SERIAL_2
 319         /*
 320          *      TX      RX
 321          *      PA2     PA3
 322          *      PD5     PD6
 323          */
 324
 325 #if SERIAL_2_PA2_PA3
 326         stm_rcc.ahbenr |= (1 << STM_RCC_AHBENR_GPIOAEN);
 327
 328         stm_afr_set(&stm_gpioa, 2, STM_AFR_AF7);
 329         stm_afr_set(&stm_gpioa, 3, STM_AFR_AF7);
 330 #else
 331 #if SERIAL_2_PD5_PD6
 332         stm_rcc.ahbenr |= (1 << STM_RCC_AHBENR_GPIODEN);
 333
 334         stm_afr_set(&stm_gpiod, 5, STM_AFR_AF7);
 335         stm_afr_set(&stm_gpiod, 6, STM_AFR_AF7);
 336 #else
 337 #error "No SERIAL_2 port configuration specified"
 338 #endif
 339 #endif
 340         /* Enable USART */
 341         stm_rcc.apb1enr |= (1 << STM_RCC_APB1ENR_USART2EN);
 342
 343         ao_stm_usart2.reg = &stm_usart2;
 344         ao_usart_init(&ao_stm_usart2);
 345
 346         stm_nvic_set_enable(STM_ISR_USART2_POS);
 347         stm_nvic_set_priority(STM_ISR_USART2_POS, 4);
 348 #if USE_SERIAL_2_STDIN
 349         ao_add_stdio(ao_serial2_pollchar,
 350                      ao_serial2_putchar,
 351                      NULL);
 352 #endif
 353 #endif
 354
 355 #if HAS_SERIAL_3
 356         /*
 357          *      TX      RX
 358          *      PB10    PB11
 359          *      PC10    PC11
 360          *      PD8     PD9
 361          */
 362 #if SERIAL_3_PB10_PB11
 363         stm_rcc.ahbenr |= (1 << STM_RCC_AHBENR_GPIOBEN);
 364
 365         stm_afr_set(&stm_gpiob, 10, STM_AFR_AF7);
 366         stm_afr_set(&stm_gpiob, 11, STM_AFR_AF7);
 367 #else
 368 #if SERIAL_3_PC10_PC11
 369         stm_rcc.ahbenr |= (1 << STM_RCC_AHBENR_GPIOCEN);
 370
 371         stm_afr_set(&stm_gpioc, 10, STM_AFR_AF7);
 372         stm_afr_set(&stm_gpioc, 11, STM_AFR_AF7);
 373 #else
 374 #if SERIAL_3_PD8_PD9
 375         stm_rcc.ahbenr |= (1 << STM_RCC_AHBENR_GPIODEN);
 376
 377         stm_afr_set(&stm_gpiod, 8, STM_AFR_AF7);
 378         stm_afr_set(&stm_gpiod, 9, STM_AFR_AF7);
 379 #else
 380 #error "No SERIAL_3 port configuration specified"
 381 #endif
 382 #endif
 383 #endif
 384         /* Enable USART */
 385         stm_rcc.apb1enr |= (1 << STM_RCC_APB1ENR_USART3EN);
 386
 387         ao_stm_usart3.reg = &stm_usart3;
 388         ao_usart_init(&ao_stm_usart3);
 389
 390         stm_nvic_set_enable(STM_ISR_USART3_POS);
 391         stm_nvic_set_priority(STM_ISR_USART3_POS, 4);
 392 #if USE_SERIAL_3_STDIN
 393         ao_add_stdio(ao_serial3_pollchar,
 394                      ao_serial3_putchar,
 395                      NULL);
 396 #endif
 397 #endif
 398 }
 399
 400