src/main/drivers/serial_uart_pinconfig.c

   1 /*
   2  * This file is part of Cleanflight and Betaflight.
   3  *
   4  * Cleanflight and Betaflight are free software. You can redistribute
   5  * this software and/or modify this software under the terms of the
   6  * GNU General Public License as published by the Free Software
   7  * Foundation, either version 3 of the License, or (at your option)
   8  * any later version.
   9  *
  10  * Cleanflight and Betaflight are distributed in the hope that they
  11  * will be useful, but WITHOUT ANY WARRANTY; without even the implied
  12  * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  13  * See the GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this software.
  17  *
  18  * If not, see <http://www.gnu.org/licenses/>.
  19  */
  20
  21 /*
  22  * UART pin configuration common to all MCUs.
  23  */
  24
  25 /*
  26  * Authors:
  27  * jflyper - Created as a part of configurable UART/refactoring.
  28 */
  29
  30 #include <stdbool.h>
  31 #include <stdint.h>
  32
  33 #include "platform.h"
  34
  35 #ifdef USE_UART
  36
  37 #include "build/build_config.h"
  38
  39 #include "drivers/rcc.h"
  40 #include "drivers/serial.h"
  41 #include "drivers/serial_uart.h"
  42 #include "drivers/serial_uart_impl.h"
  43
  44 static FAST_DATA_ZERO_INIT uartDevice_t uartDevice[UARTDEV_COUNT];      // Only those configured in target.h
  45 FAST_DATA_ZERO_INIT uartDevice_t *uartDevmap[UARTDEV_COUNT_MAX]; // Full array
  46
  47 void uartPinConfigure(const serialPinConfig_t *pSerialPinConfig)
  48 {
  49     uartDevice_t *uartdev = uartDevice;
  50
  51     for (size_t hindex = 0; hindex < UARTDEV_COUNT; hindex++) {
  52
  53         const uartHardware_t *hardware = &uartHardware[hindex];
  54         const UARTDevice_e device = hardware->device;
  55
  56 #if !(defined(STM32F1) || defined(STM32F4)) // Older CPUs don't support pin swap.
  57         uartdev->pinSwap = false;
  58 #endif
  59         for (int pindex = 0 ; pindex < UARTHARDWARE_MAX_PINS ; pindex++) {
  60             if (pSerialPinConfig->ioTagRx[device] && (pSerialPinConfig->ioTagRx[device] == hardware->rxPins[pindex].pin)) {
  61                 uartdev->rx = hardware->rxPins[pindex];
  62             }
  63
  64             if (pSerialPinConfig->ioTagTx[device] && (pSerialPinConfig->ioTagTx[device] == hardware->txPins[pindex].pin)) {
  65                 uartdev->tx = hardware->txPins[pindex];
  66             }
  67
  68
  69 #if !(defined(STM32F1) || defined(STM32F4))
  70             // Check for swapped pins
  71             if (pSerialPinConfig->ioTagTx[device] && (pSerialPinConfig->ioTagTx[device] == hardware->rxPins[pindex].pin)) {
  72                 uartdev->tx = hardware->rxPins[pindex];
  73                 uartdev->pinSwap = true;
  74             }
  75
  76             if (pSerialPinConfig->ioTagRx[device] && (pSerialPinConfig->ioTagRx[device] == hardware->txPins[pindex].pin)) {
  77                 uartdev->rx = hardware->txPins[pindex];
  78                 uartdev->pinSwap = true;
  79             }
  80 #endif
  81         }
  82
  83         if (uartdev->rx.pin || uartdev->tx.pin) {
  84             uartdev->hardware = hardware;
  85             uartDevmap[device] = uartdev++;
  86         }
  87     }
  88 }
  89 #endif