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STM32: added function to retrieve the clock frequency of APB/AHB busses

This commit is contained in:
Silvano Seva 2024-09-22 14:49:19 +02:00
parent 9ff6375c18
commit 83f4e1584a
3 changed files with 123 additions and 0 deletions
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1
meson.build
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@ -214,6 +214,7 @@ stm32f405_src = ['platform/mcu/STM32F4xx/boot/startup.cpp',
'platform/mcu/STM32F4xx/drivers/USART3.cpp',
'platform/mcu/STM32F4xx/drivers/flash.c',
'platform/mcu/STM32F4xx/drivers/rng.c',
'platform/mcu/STM32F4xx/drivers/rcc.c',
'platform/mcu/STM32F4xx/drivers/i2c_stm32.c',
'platform/mcu/STM32F4xx/drivers/spi_stm32.c',
'platform/mcu/STM32F4xx/drivers/adc_stm32.c',

68
platform/mcu/STM32F4xx/drivers/rcc.c Normal file
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@ -0,0 +1,68 @@
/***************************************************************************
* Copyright (C) 2024 by Federico Amedeo Izzo IU2NUO, *
* Niccolò Izzo IU2KIN *
* Frederik Saraci IU2NRO *
* Silvano Seva IU2KWO *
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 3 of the License, or *
* (at your option) any later version. *
* *
* This program is distributed in the hope that it will be useful, *
* but WITHOUT ANY WARRANTY; without even the implied warranty of *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
* GNU General Public License for more details. *
* *
* You should have received a copy of the GNU General Public License *
* along with this program; if not, see <http://www.gnu.org/licenses/> *
***************************************************************************/
#include <stm32f4xx.h>
#include <stdint.h>
#include "rcc.h"
static uint32_t busClockFreq[PERIPH_BUS_NUM] = {0};
static void updateBusClockFreq(const uint8_t bus)
{
uint32_t preBits;
uint32_t clkDiv = 1;
switch(bus)
{
case PERIPH_BUS_AHB:
preBits = (RCC->CFGR >> 4) & 0x0F;
if((preBits & 0x08) != 0)
clkDiv = 1 << ((preBits & 0x07) + 1);
break;
case PERIPH_BUS_APB1:
preBits = (RCC->CFGR >> 10) & 0x07;
if((preBits & 0x04) != 0)
clkDiv = 1 << ((preBits & 0x03) + 1);
break;
case PERIPH_BUS_APB2:
preBits = (RCC->CFGR >> 13) & 0x07;
if((preBits & 0x04) != 0)
clkDiv = 1 << ((preBits & 0x03) + 1);
break;
default:
break;
}
busClockFreq[bus] = SystemCoreClock / clkDiv;
}
uint32_t rcc_getBusClock(const uint8_t bus)
{
if(bus >= PERIPH_BUS_NUM)
return 0;
if(busClockFreq[bus] == 0)
updateBusClockFreq(bus);
return busClockFreq[bus];
}

54
platform/mcu/STM32F4xx/drivers/rcc.h Normal file
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@ -0,0 +1,54 @@
/***************************************************************************
* Copyright (C) 2024 by Federico Amedeo Izzo IU2NUO, *
* Niccolò Izzo IU2KIN *
* Frederik Saraci IU2NRO *
* Silvano Seva IU2KWO *
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 3 of the License, or *
* (at your option) any later version. *
* *
* This program is distributed in the hope that it will be useful, *
* but WITHOUT ANY WARRANTY; without even the implied warranty of *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
* GNU General Public License for more details. *
* *
* You should have received a copy of the GNU General Public License *
* along with this program; if not, see <http://www.gnu.org/licenses/> *
***************************************************************************/
#ifndef RCC_H
#define RCC_H
#include <stdint.h>
#ifdef __cplusplus
extern "C" {
#endif
/**
* Enumeration type for STM32 internal busses.
*/
enum PeriphBus
{
PERIPH_BUS_AHB = 0,
PERIPH_BUS_APB1 = 1,
PERIPH_BUS_APB2 = 2,
PERIPH_BUS_NUM
};
/**
* Get the clock frequency of a given peripheral bus.
*
* @param bus: bus identifier.
* @return bus clock frequency in Hz or zero in case of errors.
*/
uint32_t rcc_getBusClock(const uint8_t bus);
#ifdef __cplusplus
}
#endif
#endif /* RCC_H */