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hulk
2024-12-31 20:42:32 +08:00
commit e27e17c544
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47
src/fwdgt.c Normal file
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//
// Created by yelv1 on 24-12-29.
//
#include "fwdgt.h"
/**
* @brief Initialize the watchdog
* @param None
* @retval None
*/
void watchdog_init(void) {
/* Enable the LSI clock */
rcu_osci_on(RCU_IRC40K);
rcu_osci_stab_wait(RCU_IRC40K);
/* Configure FWDGT counter clock: 40KHz(IRC40K) / 64 = 0.625 KHz */
fwdgt_config(625, FWDGT_PSC_DIV64); // Set timeout to 1 seconds (625 / 0.625 KHz)
/* Enable FWDGT */
fwdgt_enable();
}
/**
* @brief Reset the MCU
* @param None
* @retval None
*/
void fwdgt_reset_mcu(void) {
/* Enable the write access to the FWDGT_CTL register */
FWDGT_CTL = FWDGT_WRITEACCESS_ENABLE;
/* Configure FWDGT to trigger a system reset */
fwdgt_config(50, FWDGT_PSC_DIV4);
/* Reload the counter to trigger the reset */
fwdgt_counter_reload();
}
/**
* @brief Reload the watchdog counter
* @param None
* @retval None
*/
void watchdog_reload(void) {
fwdgt_counter_reload();
}

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src/gd32e23x_it.c Normal file
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/*!
\file gd32e23x_it.c
\brief interrupt service routines
\version 2024-02-22, V2.1.0, firmware for GD32E23x
*/
/*
Copyright (c) 2024, GigaDevice Semiconductor Inc.
Redistribution and use in source and binary forms, with or without modification,
are permitted provided that the following conditions are met:
1. Redistributions of source code must retain the above copyright notice, this
list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright notice,
this list of conditions and the following disclaimer in the documentation
and/or other materials provided with the distribution.
3. Neither the name of the copyright holder nor the names of its contributors
may be used to endorse or promote products derived from this software without
specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
OF SUCH DAMAGE.
*/
#include "gd32e23x_it.h"
/*!
\brief this function handles NMI exception
\param[in] none
\param[out] none
\retval none
*/
void NMI_Handler(void)
{
/* if NMI exception occurs, go to infinite loop */
while(1) {
}
}
/*!
\brief this function handles HardFault exception
\param[in] none
\param[out] none
\retval none
*/
void HardFault_Handler(void)
{
/* if Hard Fault exception occurs, go to infinite loop */
while(1) {
}
}
/*!
\brief this function handles SVC exception
\param[in] none
\param[out] none
\retval none
*/
void SVC_Handler(void)
{
/* if SVC exception occurs, go to infinite loop */
while(1) {
}
}
/*!
\brief this function handles PendSV exception
\param[in] none
\param[out] none
\retval none
*/
void PendSV_Handler(void)
{
/* if PendSV exception occurs, go to infinite loop */
while(1) {
}
}
/*!
\brief this function handles SysTick exception
\param[in] none
\param[out] none
\retval none
*/
void SysTick_Handler(void)
{
}
/*!
\brief this function handles TIMER16 interrupt request
\param[in] none
\param[out] none
\retval none
*/
void TIMER16_IRQHandler(void)
{
if (timer_interrupt_flag_get(LED_BLINK_TIMER, TIMER_INT_FLAG_UP) == SET)
{
timer_interrupt_flag_clear(LED_BLINK_TIMER, TIMER_INT_FLAG_UP);
static uint8_t led_status = 0;
if (led_status)
{
//! turn on led & reconfig timer13 period to 19000(1900ms)
gpio_bit_write(LED_PORT, LED_PIN, RESET);
timer_autoreload_value_config(LED_BLINK_TIMER, 19200);
} else {
//! turn off led & reconfig timer13 period to 1000(100ms)
gpio_bit_write(LED_PORT, LED_PIN, SET);
timer_autoreload_value_config(LED_BLINK_TIMER, 800);
}
led_status = !led_status;
}
}

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src/i2c.c Normal file
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//
// Created by dell on 24-12-20.
//
#include "i2c.h"
/*!
\brief configure the GPIO ports
\param[in] none
\param[out] none
\retval none
*/
void i2c_gpio_config(void) {
/* enable IIC GPIO clock */
rcu_periph_clock_enable(I2C_GPIO_RCU);
/* connect I2C_SCL_PIN to I2C_SCL */
gpio_af_set(I2C_SCL_PORT, I2C_GPIO_AF, I2C_SCL_PIN);
/* connect I2C_SDA_PIN to I2C_SDA */
gpio_af_set(I2C_SDA_PORT, I2C_GPIO_AF, I2C_SDA_PIN);
/* configure GPIO pins of I2C */
gpio_mode_set(I2C_SCL_PORT, GPIO_MODE_AF, GPIO_PUPD_PULLUP, I2C_SCL_PIN);
gpio_output_options_set(I2C_SCL_PORT, GPIO_OTYPE_OD, GPIO_OSPEED_50MHZ, I2C_SCL_PIN);
gpio_mode_set(I2C_SDA_PORT, GPIO_MODE_AF, GPIO_PUPD_PULLUP, I2C_SDA_PIN);
gpio_output_options_set(I2C_SDA_PORT, GPIO_OTYPE_OD, GPIO_OSPEED_50MHZ, I2C_SDA_PIN);
}
/*!
\brief configure the I2CX interface
\param[in] none
\param[out] none
\retval none
*/
void i2c_config(void) {
/* configure I2C GPIO */
i2c_gpio_config();
/* enable I2C clock */
rcu_periph_clock_enable(I2C_RCU);
/* configure I2C clock */
i2c_clock_config(I2C_PHY, I2C_SPEED, I2C_DTCY_2);
/* configure I2C address */
i2c_mode_addr_config(I2C_PHY, I2C_I2CMODE_ENABLE, I2C_ADDFORMAT_7BITS, 0xA0);
/* enable I2CX */
i2c_enable(I2C_PHY);
/* enable acknowledge */
i2c_ack_config(I2C_PHY, I2C_ACK_ENABLE);
}
/*!
\brief reset I2C bus
\param[in] none
\param[out] none
\retval none
*/
void i2c_bus_reset(void) {
i2c_deinit(I2C_PHY);
/* configure SDA/SCL for GPIO */
GPIO_BC(I2C_SCL_PORT) |= I2C_SCL_PIN;
GPIO_BC(I2C_SDA_PORT) |= I2C_SDA_PIN;
gpio_output_options_set(I2C_SCL_PORT, GPIO_OTYPE_PP, GPIO_OSPEED_50MHZ, I2C_SCL_PIN);
gpio_output_options_set(I2C_SDA_PORT, GPIO_OTYPE_PP, GPIO_OSPEED_50MHZ, I2C_SDA_PIN);
__NOP();
__NOP();
__NOP();
__NOP();
__NOP();
GPIO_BOP(I2C_SCL_PORT) |= I2C_SCL_PIN;
__NOP();
__NOP();
__NOP();
__NOP();
__NOP();
GPIO_BOP(I2C_SDA_PORT) |= I2C_SDA_PIN;
/* connect I2C_SCL_PIN to I2C_SCL */
/* connect I2C_SDA_PIN to I2C_SDA */
gpio_output_options_set(I2C_SCL_PORT, GPIO_OTYPE_OD, GPIO_OSPEED_50MHZ, I2C_SCL_PIN);
gpio_output_options_set(I2C_SDA_PORT, GPIO_OTYPE_OD, GPIO_OSPEED_50MHZ, I2C_SDA_PIN);
/* configure the I2CX interface */
i2c_config();
}
/**
* @brief 扫描I2C总线，查找连接的设备
*
* 该函数会扫描I2C总线上的所有地址（1到126），并尝试与每个地址进行通信。
* 如果在某个地址上发现了设备，则会打印出该设备的地址。
* 最后会打印出找到的设备总数。
*/
void i2c_scan(void) {
uint32_t timeout;
uint8_t address;
int found_devices = 0;
printf("Scanning I2C bus...\r\n");
for (address = 1; address < 127; address++) {
timeout = 0;
// 生成起始条件
while (i2c_flag_get(I2C_PHY, I2C_FLAG_I2CBSY) && (timeout < I2C_TIME_OUT))
timeout++;
if (timeout >= I2C_TIME_OUT) {
continue; // 超时，跳过该地址
}
i2c_start_on_bus(I2C_PHY);
timeout = 0;
// 等待起始条件发送完成
while (!i2c_flag_get(I2C_PHY, I2C_FLAG_SBSEND) && (timeout < I2C_TIME_OUT))
timeout++;
if (timeout >= I2C_TIME_OUT) {
continue; // 超时，跳过该地址
}
i2c_master_addressing(I2C_PHY, (address << 1), I2C_TRANSMITTER);
timeout = 0;
// 等待地址发送完成
while (!i2c_flag_get(I2C_PHY, I2C_FLAG_ADDSEND) && (timeout < I2C_TIME_OUT))
timeout++;
if (timeout < I2C_TIME_OUT) {
i2c_flag_clear(I2C_PHY, I2C_FLAG_ADDSEND);
printf("Found device at 0x%02X\r\n", address);
found_devices++;
}
// 生成停止条件
i2c_stop_on_bus(I2C_PHY);
timeout = 0;
while (i2c_flag_get(I2C_PHY, I2C_FLAG_STPDET) && (timeout < I2C_TIME_OUT))
timeout++;
}
if (found_devices == 0) {
printf("No I2C devices found.\r\n");
} else {
printf("Total %d I2C devices found.\r\n", found_devices);
}
}
uint8_t i2c_write_16bits(uint8_t slave_addr, uint8_t reg_addr, uint8_t data[2]) {
uint8_t state = I2C_START;
uint16_t timeout = 0;
uint8_t i2c_timeout_flag = 0;
/* enable acknowledge */
i2c_ack_config(I2C_PHY, I2C_ACK_ENABLE);
while (!(i2c_timeout_flag)) {
switch (state) {
case I2C_START:
/* i2c master sends start signal only when the bus is idle */
while (i2c_flag_get(I2C_PHY, I2C_FLAG_I2CBSY) && (timeout < I2C_TIME_OUT)) {
timeout++;
}
if (timeout < I2C_TIME_OUT) {
i2c_start_on_bus(I2C_PHY);
timeout = 0;
state = I2C_SEND_ADDRESS;
} else {
timeout = 0;
state = I2C_START;
#ifdef DEBUG_VERBOES
printf("i2c bus is busy in WRITE BYTE!\n");
#endif
}
break;
case I2C_SEND_ADDRESS:
/* i2c master sends START signal successfully */
while ((!i2c_flag_get(I2C_PHY, I2C_FLAG_SBSEND)) && (timeout < I2C_TIME_OUT)) {
timeout++;
}
if (timeout < I2C_TIME_OUT) {
i2c_master_addressing(I2C_PHY, slave_addr, I2C_TRANSMITTER);
timeout = 0;
state = I2C_CLEAR_ADDRESS_FLAG;
} else {
timeout = 0;
state = I2C_START;
#ifdef DEBUG_VERBOES
printf("i2c master sends start signal timeout in WRITE BYTE!\n");
#endif
}
break;
case I2C_CLEAR_ADDRESS_FLAG:
/* address flag set means i2c slave sends ACK */
while ((!i2c_flag_get(I2C_PHY, I2C_FLAG_ADDSEND)) && (timeout < I2C_TIME_OUT)) {
timeout++;
}
if (timeout < I2C_TIME_OUT) {
i2c_flag_clear(I2C_PHY, I2C_FLAG_ADDSEND);
timeout = 0;
state = I2C_TRANSMIT_DATA;
} else {
timeout = 0;
state = I2C_START;
#ifdef DEBUG_VERBOES
printf("i2c master clears address flag timeout in WRITE BYTE!\n");
#endif
}
break;
case I2C_TRANSMIT_DATA:
/* wait until the transmit data buffer is empty */
while ((!i2c_flag_get(I2C_PHY, I2C_FLAG_TBE)) && (timeout < I2C_TIME_OUT)) {
timeout++;
}
if (timeout < I2C_TIME_OUT) {
/* send IIC register address */
i2c_data_transmit(I2C_PHY, reg_addr);
timeout = 0;
} else {
timeout = 0;
state = I2C_START;
#ifdef DEBUG_VERBOES
printf("i2c master sends data timeout in WRITE BYTE!\n");
#endif
}
/* wait until BTC bit is set */
while ((!i2c_flag_get(I2C_PHY, I2C_FLAG_BTC)) && (timeout < I2C_TIME_OUT)) {
timeout++;
}
if (timeout < I2C_TIME_OUT) {
/* send register MSB value */
i2c_data_transmit(I2C_PHY, data[0]);
timeout = 0;
} else {
timeout = 0;
state = I2C_START;
#ifdef DEBUG_VERBOES
printf("i2c master sends MSB data timeout in WRITE BYTE!\n");
#endif
}
/* wait until BTC bit is set */
while ((!i2c_flag_get(I2C_PHY, I2C_FLAG_BTC)) && (timeout < I2C_TIME_OUT)) {
timeout++;
}
if (timeout < I2C_TIME_OUT) {
/* send register LSB value */
i2c_data_transmit(I2C_PHY, data[1]);
timeout = 0;
state = I2C_STOP;
} else {
timeout = 0;
state = I2C_START;
#ifdef DEBUG_VERBOES
printf("i2c master sends LSB data timeout in WRITE BYTE!\n");
#endif
}
/* wait until BTC bit is set */
while ((!i2c_flag_get(I2C_PHY, I2C_FLAG_BTC)) && (timeout < I2C_TIME_OUT)) {
timeout++;
}
if (timeout < I2C_TIME_OUT) {
state = I2C_STOP;
timeout = 0;
} else {
timeout = 0;
state = I2C_START;
#ifdef DEBUG_VERBOES
printf("i2c master sends data timeout in WRITE BYTE!\n");
#endif
}
break;
case I2C_STOP:
/* send a stop condition to I2C bus */
i2c_stop_on_bus(I2C_PHY);
/* i2c master sends STOP signal successfully */
while ((I2C_CTL0(I2C_PHY) & I2C_CTL0_STOP) && (timeout < I2C_TIME_OUT)) {
timeout++;
}
if (timeout < I2C_TIME_OUT) {
timeout = 0;
state = I2C_END;
i2c_timeout_flag = I2C_OK;
} else {
timeout = 0;
state = I2C_START;
#ifdef DEBUG_VERBOES
printf("i2c master sends stop signal timeout in WRITE BYTE!\n");
#endif
}
break;
default:
state = I2C_START;
i2c_timeout_flag = I2C_OK;
timeout = 0;
#ifdef DEBUG_VERBOES
printf("i2c master sends start signal in WRITE BYTE.\n");
#endif
break;
}
}
return I2C_END;
}
uint8_t i2c_read_16bits(uint8_t slave_addr, uint8_t reg_addr, uint8_t *data) {
uint8_t state = I2C_START;
uint8_t read_cycle = 0;
uint16_t timeout = 0;
uint8_t i2c_timeout_flag = 0;
uint8_t number_of_byte = 2;
/* enable acknowledge */
i2c_ack_config(I2C_PHY, I2C_ACK_ENABLE);
while (!(i2c_timeout_flag)) {
switch (state) {
case I2C_START:
if (RESET == read_cycle) {
/* i2c master sends start signal only when the bus is idle */
while (i2c_flag_get(I2C_PHY, I2C_FLAG_I2CBSY) && (timeout < I2C_TIME_OUT)) {
timeout++;
}
if (timeout < I2C_TIME_OUT) {
/* whether to send ACK or not for the next byte */
i2c_ackpos_config(I2C_PHY, I2C_ACKPOS_NEXT);
} else {
// i2c_bus_reset();
timeout = 0;
state = I2C_START;
#ifdef DEBUG_VERBOES
printf("i2c bus is busy in READ!\n");
#endif
}
}
/* send the start signal */
i2c_start_on_bus(I2C_PHY);
timeout = 0;
state = I2C_SEND_ADDRESS;
break;
case I2C_SEND_ADDRESS:
/* i2c master sends START signal successfully */
while ((!i2c_flag_get(I2C_PHY, I2C_FLAG_SBSEND)) && (timeout < I2C_TIME_OUT)) {
timeout++;
}
if (timeout < I2C_TIME_OUT) {
if (RESET == read_cycle) {
i2c_master_addressing(I2C_PHY, slave_addr, I2C_TRANSMITTER);
state = I2C_CLEAR_ADDRESS_FLAG;
} else {
i2c_master_addressing(I2C_PHY, slave_addr, I2C_RECEIVER);
i2c_ack_config(I2C_PHY, I2C_ACK_DISABLE);
state = I2C_CLEAR_ADDRESS_FLAG;
}
timeout = 0;
} else {
timeout = 0;
state = I2C_START;
read_cycle = RESET;
#ifdef DEBUG_VERBOES
printf("i2c master sends start signal timeout in READ!\n");
#endif
}
break;
case I2C_CLEAR_ADDRESS_FLAG:
/* address flag set means i2c slave sends ACK */
while ((!i2c_flag_get(I2C_PHY, I2C_FLAG_ADDSEND)) && (timeout < I2C_TIME_OUT)) {
timeout++;
}
if (timeout < I2C_TIME_OUT) {
i2c_flag_clear(I2C_PHY, I2C_FLAG_ADDSEND);
if ((SET == read_cycle) && (1 == number_of_byte)) {
/* send a stop condition to I2C bus */
i2c_stop_on_bus(I2C_PHY);
}
timeout = 0;
state = I2C_TRANSMIT_DATA;
} else {
timeout = 0;
state = I2C_START;
read_cycle = RESET;
#ifdef DEBUG_VERBOES
printf("i2c master clears address flag timeout in READ!\n");
#endif
}
break;
case I2C_TRANSMIT_DATA:
if (RESET == read_cycle) {
/* wait until the transmit data buffer is empty */
while ((!i2c_flag_get(I2C_PHY, I2C_FLAG_TBE)) && (timeout < I2C_TIME_OUT)) {
timeout++;
}
if (timeout < I2C_TIME_OUT) {
/* send the EEPROM's internal address to write to : only one byte address */
i2c_data_transmit(I2C_PHY, reg_addr);
timeout = 0;
} else {
timeout = 0;
state = I2C_START;
read_cycle = RESET;
#ifdef DEBUG_VERBOES
printf("i2c master wait data buffer is empty timeout in READ!\n");
#endif
}
/* wait until BTC bit is set */
while ((!i2c_flag_get(I2C_PHY, I2C_FLAG_BTC)) && (timeout < I2C_TIME_OUT)) {
timeout++;
}
if (timeout < I2C_TIME_OUT) {
timeout = 0;
state = I2C_START;
read_cycle = SET;
} else {
timeout = 0;
state = I2C_START;
read_cycle = RESET;
#ifdef DEBUG_VERBOES
printf("i2c master sends register address timeout in READ!\n");
#endif
}
} else {
while (number_of_byte) {
timeout++;
if (2 == number_of_byte) {
/* wait until BTC bit is set */
while (!i2c_flag_get(I2C_PHY, I2C_FLAG_BTC));
/* send a stop condition to I2C bus */
i2c_stop_on_bus(I2C_PHY);
}
/* wait until RBNE bit is set */
if (i2c_flag_get(I2C_PHY, I2C_FLAG_RBNE)) {
/* read a byte from the EEPROM */
*data = i2c_data_receive(I2C_PHY);
/* point to the next location where the byte read will be saved */
data++;
/* decrement the read bytes counter */
number_of_byte--;
timeout = 0;
}
if (timeout > I2C_TIME_OUT) {
timeout = 0;
state = I2C_START;
read_cycle = 0;
#ifdef DEBUG_VERBOES
printf("i2c master sends data timeout in READ!\n");
#endif
}
}
timeout = 0;
state = I2C_STOP;
}
break;
case I2C_STOP:
/* i2c master sends STOP signal successfully */
while ((I2C_CTL0(I2C_PHY) & I2C_CTL0_STOP) && (timeout < I2C_TIME_OUT)) {
timeout++;
}
if (timeout < I2C_TIME_OUT) {
timeout = 0;
state = I2C_END;
i2c_timeout_flag = I2C_OK;
} else {
timeout = 0;
state = I2C_START;
read_cycle = 0;
#ifdef DEBUG_VERBOES
printf("i2c master sends stop signal timeout in READ!\n");
#endif
}
break;
default:
state = I2C_START;
read_cycle = 0;
i2c_timeout_flag = I2C_OK;
timeout = 0;
#ifdef DEBUG_VERBOES
printf("i2c master sends start signal in READ.\n");
#endif
break;
}
}
return I2C_END;
}

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//
// Created by yelv1 on 24-12-30.
//
#include "led.h"
/*!
\brief led blink configuration
\param[in] none
\param[out] none
\retval none
*/
void led_blink_config(void)
{
rcu_periph_clock_enable(LED_RCU);
gpio_mode_set(LED_PORT, GPIO_MODE_OUTPUT, GPIO_PUPD_NONE, LED_PIN);
gpio_output_options_set(LED_PORT, GPIO_OTYPE_OD, GPIO_OSPEED_50MHZ, LED_PIN);
gpio_bit_write(LED_PORT, LED_PIN, SET);
rcu_periph_clock_enable(LED_BLINK_TIMER_RCU);
timer_deinit(LED_BLINK_TIMER);
timer_parameter_struct timer_initpara;
timer_struct_para_init(&timer_initpara);
timer_initpara.prescaler =7199;
timer_initpara.alignedmode =TIMER_COUNTER_EDGE;
timer_initpara.counterdirection =TIMER_COUNTER_UP;
timer_initpara.period =9999;
timer_initpara.clockdivision =TIMER_CKDIV_DIV1;
timer_init(LED_BLINK_TIMER, &timer_initpara);
timer_auto_reload_shadow_enable(LED_BLINK_TIMER);
timer_interrupt_enable(LED_BLINK_TIMER, TIMER_INT_UP);
timer_enable(LED_BLINK_TIMER);
nvic_irq_enable(LED_BLINK_IRQ, 2);
}

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src/main.c Normal file
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/*!
\file main.c
\brief led spark with systick, USART print and key example
\version 2024-02-22, V2.1.0, firmware for GD32E23x
*/
#include "main.h"
/*!
\brief main function
\param[in] none
\param[out] none
\retval none
*/
int main(void)
{
/* configure systick */
systick_config();
/* configure USART */
rs485_config();
/* configure LED */
led_blink_config();
/* configure FWDGT */
watchdog_init();
printf("system start!\r\n");
while(1){
printf("hello world!\r\n");
delay_ms(500);
watchdog_reload();
}
}
/* retarget the C library printf function to the USART */
int _write(int fd, char *pBuffer, int size) {
for (int i = 0; i < size; i++) {
usart_data_transmit(USART0, (uint8_t) pBuffer[i]);
while (RESET == usart_flag_get(USART0, USART_FLAG_TBE));
}
return size;
}

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src/soft_i2c.c Normal file
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//
// Created by dell on 24-12-28.
//
#include "soft_i2c.h"
/*!
\brief delay
\param[in] none
\param[out] none
\retval none
*/
void soft_i2c_delay(void) {
delay_us(20); // Adjust delay as needed
/* delay to freq
* 15KHz: delay_us(20);
* 65KHz: delay_us(1);
*/
}
/*!
\brief configure the software IIC GPIO
\param[in] none
\param[out] none
\retval none
*/
void soft_i2c_config(void) {
rcu_periph_clock_enable(I2C_GPIO_RCU);
gpio_mode_set(I2C_SCL_PORT, GPIO_MODE_OUTPUT, GPIO_PUPD_PULLUP, I2C_SCL_PIN);
gpio_output_options_set(I2C_SCL_PORT, GPIO_OTYPE_OD, GPIO_OSPEED_50MHZ, I2C_SCL_PIN);
gpio_mode_set(I2C_SDA_PORT, GPIO_MODE_OUTPUT, GPIO_PUPD_PULLUP, I2C_SDA_PIN);
gpio_output_options_set(I2C_SDA_PORT, GPIO_OTYPE_OD, GPIO_OSPEED_50MHZ, I2C_SDA_PIN);
I2C_SCL_HIGH();
I2C_SDA_HIGH();
}
/*!
\brief generate I2C start signal
\param[in] none
\param[out] none
\retval none
*/
void soft_i2c_start(void) {
I2C_SDA_HIGH();
I2C_SCL_HIGH();
soft_i2c_delay();
I2C_SDA_LOW();
soft_i2c_delay();
I2C_SCL_LOW();
}
/*!
\brief generate I2C stop signal
\param[in] none
\param[out] none
\retval none
*/
void soft_i2c_stop(void) {
// sda_out();
I2C_SCL_LOW();
I2C_SDA_LOW();
soft_i2c_delay();
I2C_SCL_HIGH();
soft_i2c_delay();
I2C_SDA_HIGH();
}
/*!
\brief send I2C ACK signal
\param[in] none
\param[out] none
\retval none
*/
void soft_i2c_send_ack(void) {
// sda_out();
I2C_SDA_LOW();
soft_i2c_delay();
I2C_SCL_HIGH();
soft_i2c_delay();
I2C_SCL_LOW();
soft_i2c_delay();
I2C_SDA_HIGH();
}
/*!
\brief send I2C NACK signal
\param[in] none
\param[out] none
\retval none
*/
void soft_i2c_send_nack(void) {
I2C_SDA_HIGH();
soft_i2c_delay();
I2C_SCL_HIGH();
soft_i2c_delay();
I2C_SCL_LOW();
soft_i2c_delay();
I2C_SDA_HIGH();
}
/*!
\brief wait I2C ACK signal
\param[in] none
\param[out] none
\retval 0: ACK received, 1: ACK not received
*/
uint8_t soft_i2c_wait_ack(void) {
I2C_SDA_HIGH();
soft_i2c_delay();
I2C_SCL_HIGH();
soft_i2c_delay();
uint8_t ack = !I2C_SDA_READ();
I2C_SCL_LOW();
return ack;
}
/*!
\brief send a byte via I2C
\param[in] byte: byte to be sent
\param[out] none
\retval none
*/
void soft_i2c_send_byte(uint8_t byte) {
// sda_out();
for (int i = 0; i < 8; i++) {
if (byte & 0x80) {
I2C_SDA_HIGH();
} else {
I2C_SDA_LOW();
}
byte <<= 1;
soft_i2c_delay();
I2C_SCL_HIGH();
soft_i2c_delay();
I2C_SCL_LOW();
soft_i2c_delay();
}
}
/*!
\brief receive a byte via I2C
\param[in] ack: 1: send ACK, 0: send NACK
\param[out] none
\retval received byte
*/
uint8_t soft_i2c_receive_byte(uint8_t ack) {
uint8_t byte = 0;
I2C_SDA_HIGH();
for (int i = 0; i < 8; i++) {
byte <<= 1;
I2C_SCL_HIGH();
soft_i2c_delay();
if (I2C_SDA_READ()) {
byte |= 0x01;
}
I2C_SCL_LOW();
soft_i2c_delay();
}
if (ack) {
soft_i2c_send_ack();
} else {
soft_i2c_send_nack();
}
return byte;
}
uint8_t soft_i2c_write_16bits(uint8_t slave_addr, uint8_t reg_addr, uint8_t data[2]) {
soft_i2c_start();
soft_i2c_send_byte(slave_addr);
if (!soft_i2c_wait_ack()) {
soft_i2c_stop();
return SOFT_I2C_FAIL;
}
soft_i2c_send_byte(reg_addr);
if (!soft_i2c_wait_ack()) {
soft_i2c_stop();
return SOFT_I2C_FAIL;
}
soft_i2c_send_byte(data[0]);
if (!soft_i2c_wait_ack()) {
soft_i2c_stop();
return SOFT_I2C_FAIL;
}
soft_i2c_send_byte(data[1]);
if (soft_i2c_wait_ack()){}
soft_i2c_stop();
return SOFT_I2C_OK;
}
uint8_t soft_i2c_read_16bits(uint8_t slave_addr, uint8_t reg_addr, uint8_t *data)
{
soft_i2c_start();
soft_i2c_send_byte(slave_addr);
if (!soft_i2c_wait_ack()) {
soft_i2c_stop();
return SOFT_I2C_FAIL;
}
soft_i2c_send_byte(reg_addr);
if (!soft_i2c_wait_ack()) {
soft_i2c_stop();
return SOFT_I2C_FAIL;
}
soft_i2c_start();
soft_i2c_send_byte(slave_addr | 0x01);
if (!soft_i2c_wait_ack()) {
soft_i2c_stop();
return SOFT_I2C_FAIL;
}
soft_i2c_delay();
data[0] = soft_i2c_receive_byte(1);
data[1] = soft_i2c_receive_byte(0);
soft_i2c_stop();
return SOFT_I2C_OK;
}

91
src/systick.c Normal file
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/**
* ************************************************************************
*
* @file systick.c
* @author GD32
* @brief 通过 SysTick 定时器进行微秒级别和毫秒级别的延时函数
*
* ************************************************************************
* @copyright Copyright (c) 2024 GD32
* ************************************************************************
*/
#include "gd32e23x.h"
#include "systick.h"
volatile static float count_1us = 0;
volatile static float count_1ms = 0;
/**
* ************************************************************************
* @brief 配置 SysTick 定时器
*
*
* ************************************************************************
*/
void systick_config(void)
{
//设置了 SysTick 定时器的时钟源为 HCLK/8
systick_clksource_set(SYSTICK_CLKSOURCE_HCLK_DIV8);
//计算了每微秒所需的 SysTick 计数值
count_1us = (float)SystemCoreClock/8000000;
//计算了每毫秒所需的 SysTick 计数值
count_1ms = (float)count_1us * 1000;
}
/**
* ************************************************************************
* @brief delay_us 微秒延时函数
*
* @param[in] count 微秒值
*
* ************************************************************************
*/
void delay_us(uint32_t count)
{
uint32_t ctl;
//设置 SysTick 计数器的装载值
SysTick->LOAD = (uint32_t)(count * count_1us);
//清零 SysTick 计数器，以确保计数器从零开始计数
SysTick->VAL = 0x0000U;
//使能 SysTick 定时器，开始进行计数
SysTick->CTRL = SysTick_CTRL_ENABLE_Msk;
//等待 SysTick 计数器的计数值达到装载值时退出
do
{
ctl = SysTick->CTRL; //读取 CTRL 寄存器的值
}while((ctl & SysTick_CTRL_ENABLE_Msk)&&!(ctl & SysTick_CTRL_COUNTFLAG_Msk));
//循环退出，禁用 SysTick 定时器
SysTick->CTRL &= ~SysTick_CTRL_ENABLE_Msk;
//将 SysTick 计数器的当前值清零，以便下次使用
SysTick->VAL = 0x0000U;
}
/**
* ************************************************************************
* @brief delay_ms 毫秒延时函数
*
* @param[in] count 毫秒值
*
* ************************************************************************
*/
void delay_ms(uint32_t count)
{
uint32_t ctl;
//设置 SysTick 计数器的装载值
SysTick->LOAD = (uint32_t)(count * count_1ms);
//清零 SysTick 计数器，以确保计数器从零开始计数
SysTick->VAL = 0x0000U;
//使能 SysTick 定时器，开始进行计数
SysTick->CTRL = SysTick_CTRL_ENABLE_Msk;
//等待 SysTick 计数器的计数值达到装载值时退出
do
{
ctl = SysTick->CTRL; //读取 CTRL 寄存器的值
}while((ctl&SysTick_CTRL_ENABLE_Msk)&&!(ctl & SysTick_CTRL_COUNTFLAG_Msk));
//循环退出，禁用 SysTick 定时器
SysTick->CTRL &= ~SysTick_CTRL_ENABLE_Msk;
//将 SysTick 计数器的当前值清零，以便下次使用
SysTick->VAL = 0x0000U;
}

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src/usart.c Normal file
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//
// Created by yelv1 on 24-12-30.
//
#include "usart.h"
/**
* @brief configure the USART
* @param none
* @retval none
*/
void usart_config(void)
{
rcu_periph_clock_enable(USART_GPIO_RCU);
rcu_periph_clock_enable(USART_RCU);
gpio_af_set(USART_GPIO_PORT, USART_GPIO_AF, USART_RX_PIN);
gpio_af_set(USART_GPIO_PORT, USART_GPIO_AF, USART_TX_PIN);
gpio_mode_set(USART_GPIO_PORT, GPIO_MODE_AF, GPIO_PUPD_PULLUP, USART_RX_PIN);
gpio_output_options_set(USART_GPIO_PORT, GPIO_OTYPE_PP, GPIO_OSPEED_10MHZ, USART_RX_PIN);
gpio_mode_set(USART_GPIO_PORT, GPIO_MODE_AF, GPIO_PUPD_PULLUP, USART_TX_PIN);
gpio_output_options_set(USART_GPIO_PORT, GPIO_OTYPE_PP, GPIO_OSPEED_10MHZ, USART_TX_PIN);
usart_deinit(USART_PHY);
usart_baudrate_set(USART_PHY, USART_PHY_BAUDRATE);
usart_receive_config(USART_PHY, USART_RECEIVE_ENABLE);
usart_transmit_config(USART_PHY, USART_TRANSMIT_ENABLE);
usart_enable(USART_PHY);
}
/**
* @brief configure the RS485(MAX13487) driver
* @param none
* @retval none
*/
void rs485_config(void)
{
usart_config();
gpio_mode_set(RS485_EN_PORT, GPIO_MODE_OUTPUT, GPIO_PUPD_NONE, RS485_EN_PIN);
gpio_output_options_set(RS485_EN_PORT, GPIO_OTYPE_PP, GPIO_OSPEED_50MHZ, RS485_EN_PIN);
gpio_bit_write(RS485_EN_PORT, RS485_EN_PIN, SET); //auto dircetion control
}