mirror of https://github.com/ARMmbed/mbed-os.git
154 lines
3.9 KiB
C
Executable File
154 lines
3.9 KiB
C
Executable File
/* mbed Microcontroller Library
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* SPDX-License-Identifier: BSD-3-Clause
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******************************************************************************
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*
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* Copyright (c) 2021 STMicroelectronics.
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* All rights reserved.
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*
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* This software component is licensed by ST under BSD 3-Clause license,
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* the "License"; You may not use this file except in compliance with the
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* License. You may obtain a copy of the License at:
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* opensource.org/licenses/BSD-3-Clause
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*
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******************************************************************************
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*/
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#include "i2c_device.h"
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#include "mbed_assert.h"
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#include "mbed_error.h"
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#include "stm32l5xx_ll_rcc.h"
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/* Define I2C Device */
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#if DEVICE_I2C
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/**
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* @brief Get I2C clock source frequency according I2C instance used.
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* @param i2c I2C instance name.
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* @retval I2C clock source frequency in Hz.
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*/
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uint32_t i2c_get_pclk(I2CName i2c)
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{
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uint32_t clocksource;
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uint32_t pclk = 0;
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if (i2c == I2C_1) {
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clocksource = __HAL_RCC_GET_I2C1_SOURCE();
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switch (clocksource) {
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case RCC_I2C1CLKSOURCE_PCLK1:
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pclk = HAL_RCC_GetPCLK1Freq();
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break;
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case RCC_I2C1CLKSOURCE_SYSCLK:
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pclk = HAL_RCC_GetSysClockFreq();
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break;
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case RCC_I2C1CLKSOURCE_HSI:
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pclk = HSI_VALUE;
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break;
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}
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}
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#if defined I2C2_BASE
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else if (i2c == I2C_2) {
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clocksource = __HAL_RCC_GET_I2C2_SOURCE();
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switch (clocksource) {
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case RCC_I2C2CLKSOURCE_PCLK1:
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pclk = HAL_RCC_GetPCLK1Freq();
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break;
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case RCC_I2C2CLKSOURCE_SYSCLK:
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pclk = HAL_RCC_GetSysClockFreq();
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break;
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case RCC_I2C2CLKSOURCE_HSI:
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pclk = HSI_VALUE;
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break;
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}
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}
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#endif
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#if defined I2C3_BASE
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else if (i2c == I2C_3) {
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clocksource = __HAL_RCC_GET_I2C3_SOURCE();
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switch (clocksource) {
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case RCC_I2C3CLKSOURCE_PCLK1:
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pclk = HAL_RCC_GetPCLK1Freq();
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break;
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case RCC_I2C3CLKSOURCE_SYSCLK:
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pclk = HAL_RCC_GetSysClockFreq();
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break;
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case RCC_I2C3CLKSOURCE_HSI:
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pclk = HSI_VALUE;
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break;
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}
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}
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#endif
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#if defined I2C4_BASE
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else if (i2c == I2C_4) {
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clocksource = __HAL_RCC_GET_I2C4_SOURCE();
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switch (clocksource) {
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case RCC_I2C4CLKSOURCE_PCLK1:
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pclk = HAL_RCC_GetPCLK1Freq();
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break;
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case RCC_I2C4CLKSOURCE_SYSCLK:
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pclk = HAL_RCC_GetSysClockFreq();
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break;
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case RCC_I2C4CLKSOURCE_HSI:
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pclk = HSI_VALUE;
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break;
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}
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}
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#endif
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else {
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// should not happend
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error("I2C: unknown instance");
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}
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return pclk;
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}
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/**
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* @}
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*/
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/** @defgroup I2C_DEVICE_Exported_Functions I2C_DEVICE Exported Functions
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* @{
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*/
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/**
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* @brief Provide the suitable timing depending on requested frequency
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* @param hz Required I2C clock in Hz.
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* @retval I2C timing or 0 in case of error.
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*/
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uint32_t i2c_get_timing(I2CName i2c, int hz)
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{
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uint32_t tim;
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uint32_t pclk;
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pclk = i2c_get_pclk(i2c);
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if (pclk == I2C_PCLK_DEF) {
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switch (hz) {
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case 100000:
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tim = TIMING_VAL_DEFAULT_CLK_100KHZ;
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break;
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case 400000:
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tim = TIMING_VAL_DEFAULT_CLK_400KHZ;
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break;
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case 1000000:
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tim = TIMING_VAL_DEFAULT_CLK_1MHZ;
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break;
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default:
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MBED_ASSERT((hz == 100000) || (hz == 400000) || (hz == 1000000));
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break;
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}
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}
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else {
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tim = i2c_compute_timing(pclk, hz);
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}
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return tim;
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}
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/**
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* @}
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*/
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#endif // DEVICE_I2C
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