1、SGM58031芯片詳解

（1）SGM58031是一款低功耗，16位精度，delta-sigma (ΔΣ)模數轉換器(ADC)。它從3V到5.5V供電。

（2）SGM58031包含一個片上參考和振蕩器。它有一個I2C兼容接口，可以選擇四個I2C從地址。

（3）SGM58031有兩種工作模式：單次發射模式和連續轉換模式。
在單次觸發模式下，ADC執行一次轉換并給出完整的固定數據，無需丟棄任何數據。一旦ADC完成轉換，它就會進入低功率關閉模式。
在連續模式中，ADC在先前的轉換完成后自動開始新的轉換。給出了每一個轉換結果。數據速率等于配置的數據速率。

（4）SGM58031的引腳說明

（5）參考電壓

2、SGM58031工程代碼編寫

iic.c

#include "iic.h"#define I2C1_SLAVE_ADDRESS7 0x90void i2c_config(void)
{/* enable GPIOB clock */rcu_periph_clock_enable(RCU_GPIOB);/* enable I2C1 clock */rcu_periph_clock_enable(RCU_I2C1);rcu_periph_clock_enable(RCU_AF);/* connect PB10 to I2C1_SCL *//* connect PB11 to I2C1_SDA */gpio_init(GPIOB, GPIO_MODE_AF_OD, GPIO_OSPEED_50MHZ,  GPIO_PIN_10 | GPIO_PIN_11);i2c_clock_config(I2C1, 100000, I2C_DTCY_2);i2c_mode_addr_config(I2C1, I2C_I2CMODE_ENABLE, I2C_ADDFORMAT_7BITS, I2C1_SLAVE_ADDRESS7);i2c_enable(I2C1);i2c_ack_config(I2C1, I2C_ACK_ENABLE);
}/* I2C寫函數 */
void i2c_write(uint8_t reg_addr, uint16_t send_data)
{uint8_t high_val=0x00;uint8_t low_val=0x00;low_val = send_data&0x00ff;				high_val = (send_data>>8)&0x00ff;//寫開始時序/* wait until i2c bus is idle */while(i2c_flag_get(I2C1, I2C_FLAG_I2CBSY));/* send a start condition to I2C bus */i2c_start_on_bus(I2C1);/* wait until SBSEND bit is set */while(!i2c_flag_get(I2C1, I2C_FLAG_SBSEND));    /* send slave address to I2C bus *///寫從機地址時序i2c_master_addressing(I2C1, I2C1_SLAVE_ADDRESS7, I2C_TRANSMITTER);/* wait until ADDSEND bit is set */while(!i2c_flag_get(I2C1, I2C_FLAG_ADDSEND));/* clear ADDSEND bit */i2c_flag_clear(I2C1, I2C_FLAG_ADDSEND);/* wait until the transmit data buffer is empty */while(!i2c_flag_get(I2C1, I2C_FLAG_TBE));//寫寄存器地址時序i2c_data_transmit(I2C1, reg_addr);/* wait until the TBE bit is set */while(!i2c_flag_get(I2C1, I2C_FLAG_BTC));//寫 寫入數據 時序/* data transmission */i2c_data_transmit(I2C1, high_val);//先發送高8位數據/* wait until the TBE bit is set */while(!i2c_flag_get(I2C1, I2C_FLAG_BTC));i2c_data_transmit(I2C1, low_val);//再發送低8位數據/* wait until the TBE bit is set */while(!i2c_flag_get(I2C1, I2C_FLAG_BTC));//寫停止時序	/* send a stop condition to I2C bus */i2c_stop_on_bus(I2C1);/* wait until stop condition generate */ while(I2C_CTL0(I2C1)&0x0200);
}/* I2C讀函數 */
uint16_t i2c_read_byte(uint8_t reg_addr)
{uint8_t high_val=0x00;uint8_t low_val=0x00;uint16_t recv_val = 0x0000;//寫開始時序/* wait until i2c bus is idle */while(i2c_flag_get(I2C1, I2C_FLAG_I2CBSY));/* send a start condition to I2C bus */i2c_start_on_bus(I2C1);/* wait until SBSEND bit is set */while(!i2c_flag_get(I2C1, I2C_FLAG_SBSEND));    //寫 從機地址+寫 時序/* send slave address to I2C bus */i2c_master_addressing(I2C1, I2C1_SLAVE_ADDRESS7, I2C_TRANSMITTER);/* wait until ADDSEND bit is set */while(!i2c_flag_get(I2C1, I2C_FLAG_ADDSEND));/* clear ADDSEND bit */i2c_flag_clear(I2C1, I2C_FLAG_ADDSEND);/* wait until the transmit data buffer is empty */while(!i2c_flag_get(I2C1, I2C_FLAG_TBE));//寫 讀寄存器地址 時序i2c_data_transmit(I2C1, reg_addr);/* wait until the BTC bit is set */while(!i2c_flag_get(I2C1, I2C_FLAG_BTC));//寫停止時序i2c_stop_on_bus(I2C1);while(I2C_CTL0(I2C1)&0x0200);//寫開始時序	i2c_start_on_bus(I2C1);/* wait until SBSEND bit is set */while(!i2c_flag_get(I2C1, I2C_FLAG_SBSEND));//寫 從機地址+讀 時序/* send slave address to I2C bus */i2c_master_addressing(I2C1, I2C1_SLAVE_ADDRESS7, I2C_RECEIVER);/* wait until ADDSEND bit is set */while(!i2c_flag_get(I2C1, I2C_FLAG_ADDSEND));/* clear the ADDSEND bit */i2c_flag_clear(I2C1,I2C_FLAG_ADDSEND);/* wait until the RBNE bit is set	and clear it*/while(!i2c_flag_get(I2C1, I2C_FLAG_RBNE));//接收數據 時序high_val = i2c_data_receive(I2C1);while(!i2c_flag_get(I2C1, I2C_FLAG_RBNE));i2c_ack_config(I2C1, I2C_ACK_DISABLE);i2c_ackpos_config(I2C1,I2C_ACKPOS_NEXT);low_val = i2c_data_receive(I2C1);/* wait until the BTC bit is set *///while(!i2c_flag_get(I2C1, I2C_FLAG_BTC));代碼卡死，屏蔽后不卡死，可以成功讀取數據		//寫停止時序/* send a stop condition to I2C bus */i2c_stop_on_bus(I2C1);/* wait until stop condition generate */ while(I2C_CTL0(I2C1)&0x0200);recv_val = (high_val<<8)|low_val;i2c_ack_config(I2C1, I2C_ACK_ENABLE);return recv_val;
}

iic.h

#ifndef __IIC_H
#define __IIC_H#include "gd32f30x.h"
#include "string.h"void i2c_config(void);
void i2c_write(uint8_t reg_addr, uint16_t send_data);
uint16_t i2c_read_byte(uint8_t reg_addr);#endif

main.c

    // 使能 RDY輸出功能i2c_write(0x03,0x8000); // Write 0x8000 to Hi_Threshi2c_write(0x02,0x0000); // Write  0x0000  to Lo_Thresh// 配置ADC輸入， 啟動連續轉換模式i2c_write(0x01,0xC4e0);//Write config, OS=1, AIN0 to GND, G=2(+/-2.048V input range),//continuous mode conversion, DR=800, others default //COMP_QUE = 00Vbat = i2c_read_byte(0x00);//讀取電壓值//轉換  Vbat/65535*參考電壓（比如4.096V)