Unverified Commit 3fffef85 authored by Birte Kristina Friesel's avatar Birte Kristina Friesel
Browse files

stm32f446re: Add I²C driver

parent ae68513e

README.md

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@@ -54,7 +54,7 @@ features; the remainder of this README covers details. 
| MSP430FR5969 | 16 MHz | 48 (64) KiB FRAM | 2 KiB SRAM | I²C, SPI, UART, DMX, ADC |

| MSP430FR5994 | 16 MHz | 48 (256) KiB FRAM | 4 (8) KiB SRAM | I²C, SPI, UART, DMX, ADC |

| RM46L852 (Cortex-R4F) | 160 MHz | 1.25 MiB Flash | 192 KiB SRAM | |

| STM32F446RE (Cortex-M4) | 168 MHz | 512 KiB Flash | 128 KiB SRAM | |

| STM32F446RE (Cortex-M4) | 168 MHz | 512 KiB Flash | 128 KiB SRAM | I²C |

| STM32F746ZG (Cortex-M7) | 216 MHz | 1 MiB Flash | 320 KiB SRAM | |

| POSIX | – | – | – | I²C |
@@ -131,6 +131,7 @@ Peripheral communication: 
Peripheral communication:



* UART output on USART2

* I²C on I2C1 muxed to PB8 / PB9



### STM32F746ZG (NUCLEO-F746ZG)

include/arch/stm32f446re-nucleo/driver/i2c.h

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/*

 * Copyright 2024 Birte Kristina Friesel

 *

 * SPDX-License-Identifier: BSD-2-Clause

 */

#ifndef I2C_H

#define I2C_H



class I2C {

	private:

		I2C(const I2C &copy);



	public:

		I2C () {}

		signed char setup();

		signed char xmit(unsigned char address,

				unsigned char tx_len, unsigned char *tx_buf,

				unsigned char rx_len, unsigned char *rx_buf);

};



extern I2C i2c;



#endif

src/arch/stm32f446re-nucleo/Kconfig

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# Copyright 2020 Birte Kristina Friesel

# Copyright 2024 Birte Kristina Friesel

#

# SPDX-License-Identifier: CC0-1.0

config arch_stm32f446re_nucleo_driver_counter

bool "Cycle Counter"

select meta_driver_counter



config arch_stm32f446re_nucleo_driver_i2c

bool "I²C on PB[89]"

help

  SDA: PB9 (CN5 D14)

  SCL: PB8 (CN5 D15)

select meta_driver_hardware_i2c

select meta_driver_i2c



config arch_stm32f446re_nucleo_driver_i2c_fast_mode

bool "Fast Mode (400 kHz)"

depends on arch_stm32f446re_nucleo_driver_i2c



#config arch_stm32f446re_nucleo_driver_timer

#bool "Timer with Interrupts"

#select meta_driver_timer

src/arch/stm32f446re-nucleo/Makefile.inc

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@@ -55,6 +55,10 @@ ifdef CONFIG_arch_stm32f446re_nucleo_driver_counter 
	CXX_TARGETS += src/arch/stm32f446re-nucleo/driver/counter.cc

endif



ifdef CONFIG_arch_stm32f446re_nucleo_driver_i2c

	CXX_TARGETS += src/arch/stm32f446re-nucleo/driver/i2c.cc

endif



#ifdef CONFIG_arch_stm32f446re_nucleo_driver_timer

#	CXX_TARGETS += src/arch/stm32f446re-nucleo/driver/timer.cc

#endif

src/arch/stm32f446re-nucleo/driver/i2c.cc

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/*

 * Copyright 2024 Birte Kristina Friesel

 *

 * SPDX-License-Identifier: BSD-2-Clause

 */

#include "driver/i2c.h"

#include "arch.h"

#include <libopencm3/stm32/rcc.h>

#include <libopencm3/stm32/gpio.h>

#include <libopencm3/stm32/i2c.h>



signed char I2C::setup()

{

	rcc_periph_clock_enable(RCC_I2C1);

	gpio_set_af(GPIOB, GPIO_AF4, GPIO8 | GPIO9);

	gpio_set_output_options(GPIOB, GPIO_OTYPE_OD, GPIO_OSPEED_2MHZ, GPIO8|GPIO9);

	gpio_mode_setup(GPIOB, GPIO_MODE_AF, GPIO_PUPD_NONE, GPIO8 | GPIO9);

	i2c_peripheral_disable(I2C1);

#ifdef CONFIG_arch_stm32f446re_nucleo_driver_i2c_fast_mode

	i2c_set_speed(I2C1, i2c_speed_fm_400k, rcc_apb1_frequency / 1000000);

#else

	i2c_set_speed(I2C1, i2c_speed_sm_100k, rcc_apb1_frequency / 1000000);

#endif

	i2c_set_standard_mode(I2C1);

	i2c_peripheral_enable(I2C1);



	return 0;

}



signed char I2C::xmit(unsigned char address,

		unsigned char tx_len, unsigned char *tx_buf,

		unsigned char rx_len, unsigned char *rx_buf)

{

	i2c_transfer7(I2C1, address, tx_buf, tx_len, rx_buf, rx_len);

	return 0;

}



I2C i2c;