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Commit b5fbee4

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Jan Kamidra
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Add initial SPI and I2C
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‎targets/TARGET_STM/TARGET_STM32U0/CMakeLists.txt‎

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@@ -11,7 +11,10 @@ target_sources(mbed-stm32u0
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clock_cfg/system_clock.c
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analogin_device.c
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analogout_device.c
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flash_api.c
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gpio_irq_device.c
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i2c_device.c
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spi_api.c
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pwmout_device.c
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serial_device.c
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)

‎targets/TARGET_STM/TARGET_STM32U0/i2c_device.c‎

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/* 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) 2015-2021 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 "stm32u0xx_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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pclk = HAL_RCC_GetPCLK1Freq();
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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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pclk = HAL_RCC_GetPCLK1Freq();
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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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#endif // DEVICE_I2C

‎targets/TARGET_STM/TARGET_STM32U0/i2c_device.h‎

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/* 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) 2015-2021 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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#ifndef MBED_I2C_DEVICE_H
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#define MBED_I2C_DEVICE_H
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#include "PeripheralNames.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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/* Define I2C Device */
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#if DEVICE_I2C
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/* Define IP version */
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#define I2C_IP_VERSION_V2
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#define I2C1_EV_IRQn I2C1_IRQn
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#define I2C1_ER_IRQn I2C1_IRQn
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#define I2C2_EV_IRQn I2C2_3_4_IRQn
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#define I2C2_ER_IRQn I2C2_3_4_IRQn
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#define I2C3_EV_IRQn I2C2_3_4_IRQn
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#define I2C3_ER_IRQn I2C2_3_4_IRQn
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#define I2C4_EV_IRQn I2C2_3_4_IRQn
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#define I2C4_ER_IRQn I2C2_3_4_IRQn
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// Common settings: I2C clock = 56 MHz, Analog filter = ON, Digital filter coefficient = 0
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#define TIMING_VAL_56M_CLK_100KHZ 0x20C04963 // Standard mode with Rise Time = 400ns and Fall Time = 100ns
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#define TIMING_VAL_56M_CLK_400KHZ 0x2060091A // Fast mode with Rise Time = 250ns and Fall Time = 100ns
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#define TIMING_VAL_56M_CLK_1MHZ 0x00600A19 // Fast mode Plus with Rise Time = 60ns and Fall Time = 100ns
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#define I2C_PCLK_56M 56000000 // 56 MHz
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#define I2C_IT_ALL (I2C_IT_ERRI|I2C_IT_TCI|I2C_IT_STOPI|I2C_IT_NACKI|I2C_IT_ADDRI|I2C_IT_RXI|I2C_IT_TXI)
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/* Family specifc settings for clock source */
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#define I2CAPI_I2C1_CLKSRC RCC_I2C1CLKSOURCE_SYSCLK
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#define I2CAPI_I2C3_CLKSRC RCC_I2C3CLKSOURCE_SYSCLK
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uint32_t i2c_get_pclk(I2CName i2c);
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uint32_t i2c_get_timing(I2CName i2c, uint32_t current_timing, int current_hz, int hz);
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#if MBED_CONF_TARGET_I2C_TIMING_VALUE_ALGO
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uint32_t i2c_compute_timing(uint32_t clock_src_freq, uint32_t i2c_freq);
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void i2c_compute_presc_scldel_sdadel(uint32_t clock_src_freq, uint32_t I2C_speed);
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uint32_t i2c_compute_scll_sclh(uint32_t clock_src_freq, uint32_t I2C_speed);
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#endif // MBED_CONF_TARGET_I2C_TIMING_VALUE_ALGO
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#endif // DEVICE_I2C
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#ifdef __cplusplus
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}
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#endif
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#endif

‎targets/TARGET_STM/TARGET_STM32U0/spi_api.c‎

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/* 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) 2015-2021 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 "mbed_assert.h"
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#include "spi_api.h"
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#if DEVICE_SPI
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#include "cmsis.h"
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#include "pinmap.h"
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#include "mbed_error.h"
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#include "PeripheralPins.h"
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#if DEVICE_SPI_ASYNCH
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#define SPI_S(obj) (( struct spi_s *)(&(obj->spi)))
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#else
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#define SPI_S(obj) (( struct spi_s *)(obj))
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#endif
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/*
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* Only the frequency is managed in the family specific part
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* the rest of SPI management is common to all STM32 families
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*/
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int spi_get_clock_freq(spi_t *obj)
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{
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struct spi_s *spiobj = SPI_S(obj);
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int spi_hz = 0;
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/* Get source clock depending on SPI instance */
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switch ((int)spiobj->spi) {
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case SPI_1:
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case SPI_2:
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case SPI_3:
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spi_hz = HAL_RCC_GetPCLK1Freq();
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break;
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default:
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error("CLK: SPI instance not set");
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break;
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}
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return spi_hz;
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}
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#endif

‎targets/TARGET_STM/TARGET_STM32U0/spi_device.h‎

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/* 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) 2015-2021 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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#ifndef MBED_SPI_DEVICE_H
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#define MBED_SPI_DEVICE_H
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#include "stm32u0xx_ll_spi.h"
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#define SPI_IP_VERSION_V1 // SPI2S2 / SPI2S3 IP version
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// Defines the word legnth capability of the device where Nth bit allows for N window size
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#define STM32_SPI_CAPABILITY_WORD_LENGTH (0x0000FFF8)
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// We have DMA support
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#define STM32_SPI_CAPABILITY_DMA 1
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#define SPI2_IRQn SPI2_3_IRQn
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#define SPI3_IRQn SPI2_3_IRQn
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#endif

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