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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;
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