src/main/drivers/mco.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 #include <stdbool.h>
  22 #include <stdint.h>
  23 #include <string.h>
  24
  25 #include "platform.h"
  26
  27 #ifdef USE_MCO
  28
  29 #include "drivers/io.h"
  30 #include "drivers/mco.h"
  31 #include "pg/mco.h"
  32
  33 #ifdef STM32G4
  34
  35 // Notes
  36 // - MCO output stability
  37 // MCO output should not be too high.
  38 // For example
  39 // it is required to use DIV4 for SYSCLK = 254MHz (derives 62.5MHz)
  40 // it is required to use DIV2 for SYSCLK = 170MHz (derives 85MHz)
  41 //
  42 // - MCO frequency can be more flexible if PLLR is made configurable.
  43
  44 const uint32_t mcoSources[MCO_SOURCE_COUNT] = {
  45     RCC_MCO1SOURCE_NOCLOCK,
  46     RCC_MCO1SOURCE_SYSCLK,
  47     RCC_MCO1SOURCE_HSI,
  48     RCC_MCO1SOURCE_HSE,
  49     RCC_MCO1SOURCE_PLLCLK, // PLLR on G4
  50     RCC_MCO1SOURCE_LSI,
  51     RCC_MCO1SOURCE_LSE,
  52     RCC_MCO1SOURCE_HSI48,
  53 };
  54
  55 const uint32_t mcoDividers[MCO_DIVIDER_COUNT] = {
  56     RCC_MCO_DIV1,
  57     RCC_MCO_DIV2,
  58     RCC_MCO_DIV4,
  59     RCC_MCO_DIV8,
  60     RCC_MCO_DIV16,
  61 };
  62 #endif
  63
  64 void mcoConfigure(MCODevice_e device, const mcoConfig_t *config)
  65 {
  66     if (!config->enabled) {
  67         return;
  68     }
  69
  70     IO_t io;
  71
  72 #if defined(STM32F4) || defined(STM32F7)
  73     // Only configure MCO2 with PLLI2SCLK as source for now.
  74     // Other MCO1 and other sources can easily be added.
  75
  76     switch(device) {
  77     case MCODEV_1: // MCO1 on PA8
  78         return; // Not supported (yet)
  79
  80     case MCODEV_2: // MCO2 on PC9
  81         io = IOGetByTag(DEFIO_TAG_E(PC9));
  82         IOInit(io, OWNER_MCO, 2);
  83 #if defined(STM32F7)
  84         HAL_RCC_MCOConfig(RCC_MCO2, RCC_MCO2SOURCE_PLLI2SCLK, RCC_MCODIV_4);
  85         IOConfigGPIOAF(io, IO_CONFIG(GPIO_MODE_AF_PP, GPIO_SPEED_FREQ_VERY_HIGH,  GPIO_NOPULL), GPIO_AF0_MCO);
  86 #else
  87         // All F4s
  88         RCC_MCO2Config(RCC_MCO2Source_PLLI2SCLK, RCC_MCO2Div_4);
  89         IOConfigGPIOAF(io, IO_CONFIG(GPIO_Mode_AF, GPIO_Speed_50MHz, GPIO_OType_PP, GPIO_PuPd_NOPULL), GPIO_AF_MCO);
  90 #endif
  91         break;
  92     }
  93 #elif defined(STM32G4)
  94     // G4 only supports one MCO on PA8
  95     UNUSED(device);
  96
  97     io = IOGetByTag(DEFIO_TAG_E(PA8));
  98     IOInit(io, OWNER_MCO, 1);
  99     HAL_RCC_MCOConfig(RCC_MCO, mcoSources[config->source], mcoDividers[config->divider]);
 100 #else
 101 #error Unsupported MCU
 102 #endif
 103 }
 104 #endif