129 lines
4.4 KiB
C
129 lines
4.4 KiB
C
/*!
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\file i2c.c
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\brief I2C configuration file
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\version 2025-01-24, V1.4.0, firmware for GD32H7xx
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*/
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/*
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Copyright (c) 2025, GigaDevice Semiconductor Inc.
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Redistribution and use in source and binary forms, with or without modification,
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are permitted provided that the following conditions are met:
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1. Redistributions of source code must retain the above copyright notice, this
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list of conditions and the following disclaimer.
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2. Redistributions in binary form must reproduce the above copyright notice,
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this list of conditions and the following disclaimer in the documentation
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and/or other materials provided with the distribution.
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3. Neither the name of the copyright holder nor the names of its contributors
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may be used to endorse or promote products derived from this software without
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specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
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INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
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OF SUCH DAMAGE.
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*/
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#include "i2c1.h"
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#include <stdio.h>
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#include "gd32h7xx.h"
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/*!
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\brief configure the GPIO ports
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\param[in] none
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\param[out] none
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\retval none
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*/
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void gpio_config(void)
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{
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/* enable GPIO clock */
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rcu_periph_clock_enable(RCU_GPIO_I2C);
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/* enable I2C clock */
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rcu_periph_clock_enable(RCU_I2C);
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/* connect I2C_SCL_PIN to I2C_SCL */
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gpio_af_set(I2C_SCL_PORT, I2C_GPIO_AF, I2C_SCL_PIN);
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/* connect I2C_SDA_PIN to I2C_SDA */
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gpio_af_set(I2C_SDA_PORT, I2C_GPIO_AF, I2C_SDA_PIN);
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/* configure GPIO pins of I2C */
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gpio_mode_set(I2C_SCL_PORT, GPIO_MODE_AF, GPIO_PUPD_PULLUP, I2C_SCL_PIN);
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gpio_output_options_set(I2C_SCL_PORT, GPIO_OTYPE_OD, GPIO_OSPEED_60MHZ, I2C_SCL_PIN);
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gpio_mode_set(I2C_SDA_PORT, GPIO_MODE_AF, GPIO_PUPD_PULLUP, I2C_SDA_PIN);
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gpio_output_options_set(I2C_SDA_PORT, GPIO_OTYPE_OD, GPIO_OSPEED_60MHZ, I2C_SDA_PIN);
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}
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/*!
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\brief configure the I2C interface
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\param[in] none
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\param[out] none
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\retval none
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*/
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void i2c_config(void)
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{
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/* configure I2C timing */
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i2c_timing_config(I2CX, 0x3, 0x7, 0);
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i2c_master_clock_config(I2CX, 0x32, 0x32);
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/* enable analog filter and disable digital filter for bus robustness */
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i2c_analog_noise_filter_enable(I2CX);
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i2c_digital_noise_filter_config(I2CX, FILTER_DISABLE);
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/* enable I2C */
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i2c_enable(I2CX);
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}
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/*!
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\brief reset I2C gpio configure
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\param[in] none
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\param[out] none
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\retval none
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*/
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void i2c_gpio_reset(void)
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{
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/* reset I2C_SCL_PIN and I2C_SDA_PIN */
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gpio_mode_set(I2C_SCL_PORT, GPIO_MODE_OUTPUT, GPIO_PUPD_NONE, I2C_SCL_PIN);
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gpio_output_options_set(I2C_SCL_PORT, GPIO_OTYPE_PP, GPIO_OSPEED_60MHZ, I2C_SCL_PIN);
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gpio_mode_set(I2C_SDA_PORT, GPIO_MODE_OUTPUT, GPIO_PUPD_NONE, I2C_SDA_PIN);
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gpio_output_options_set(I2C_SDA_PORT, GPIO_OTYPE_PP, GPIO_OSPEED_60MHZ, I2C_SDA_PIN);
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}
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/*!
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\brief reset i2c bus
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\param[in] none
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\param[out] none
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\retval none
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*/
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void i2c_bus_reset()
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{
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/* configure SDA/SCL for GPIO */
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GPIO_BC(I2C_SCL_PORT) |= I2C_SCL_PIN;
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GPIO_BC(I2C_SDA_PORT) |= I2C_SDA_PIN;
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/* reset I2C_SCL_PIN and I2C_SDA_PIN */
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i2c_gpio_reset();
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__NOP();
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__NOP();
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__NOP();
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__NOP();
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__NOP();
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/* stop signal */
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GPIO_BOP(I2C_SCL_PORT) |= I2C_SCL_PIN;
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__NOP();
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__NOP();
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__NOP();
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__NOP();
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__NOP();
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GPIO_BOP(I2C_SDA_PORT) |= I2C_SDA_PIN;
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/* connect I2C_SCL_PIN to I2C_SCL */
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/* connect I2C_SDA_PIN to I2C_SDA */
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gpio_mode_set(I2C_SCL_PORT, GPIO_MODE_AF, GPIO_PUPD_PULLUP, I2C_SCL_PIN);
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gpio_output_options_set(I2C_SCL_PORT, GPIO_OTYPE_OD, GPIO_OSPEED_60MHZ, I2C_SCL_PIN);
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gpio_mode_set(I2C_SDA_PORT, GPIO_MODE_AF, GPIO_PUPD_PULLUP, I2C_SDA_PIN);
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gpio_output_options_set(I2C_SDA_PORT, GPIO_OTYPE_OD, GPIO_OSPEED_60MHZ, I2C_SDA_PIN);
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}
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