Unverified Commit 190fef22 authored by Birte Kristina Friesel's avatar Birte Kristina Friesel
Browse files

stm32f7: Add I²C driver. With fast mode!

parent 5db1ecd3

include/arch/stm32f746zg-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/stm32f746zg-nucleo/Kconfig

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@@ -8,3 +8,15 @@ select meta_driver_counter 
config arch_stm32f746zg_nucleo_driver_uptime

bool "Uptime Counter"

select meta_driver_uptime



config arch_stm32f746zg_nucleo_driver_i2c

bool "I²C on PB[89]"

help

  SDA: PB9 (CN7 D14)

  SCL: PB8 (CN7 D15)

select meta_driver_hardware_i2c

select meta_driver_i2c



config arch_stm32f746zg_nucleo_driver_i2c_fast_mode

bool "Fast Mode (400 kHz)"

depends on arch_stm32f746zg_nucleo_driver_i2c

src/arch/stm32f746zg-nucleo/Makefile.inc

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@@ -51,9 +51,9 @@ ifdef CONFIG_arch_stm32f746zg_nucleo_driver_counter 
	CXX_TARGETS += src/arch/stm32f746zg-nucleo/driver/counter.cc

endif



#ifdef CONFIG_arch_stm32f746zg_nucleo_driver_i2c

#	CXX_TARGETS += src/arch/stm32f746zg-nucleo/driver/i2c.cc

#endif

ifdef CONFIG_arch_stm32f746zg_nucleo_driver_i2c

	CXX_TARGETS += src/arch/stm32f746zg-nucleo/driver/i2c.cc

endif



#ifdef CONFIG_arch_stm32f746zg_nucleo_driver_timer

#	CXX_TARGETS += src/arch/stm32f746zg-nucleo/driver/timer.cc

src/arch/stm32f746zg-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_stm32f746zg_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_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;