302 lines
7.8 KiB
C
302 lines
7.8 KiB
C
#include "ads1220.h"
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#include "delay.h"
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#include "main.h"
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unsigned char PolarFlag;
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unsigned char Init_Config[4],channel0[8],channel1[8],channel2[8],channel3[8];
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unsigned char i;
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/***************************************************************************
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接线顺序
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*************************************************************************/
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//PB0 DRDY
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//PA7 MISO
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#define DIN_H HAL_GPIO_WritePin(GPIOA,GPIO_PIN_7,GPIO_PIN_SET); //PA7 MOSI
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#define DIN_L HAL_GPIO_WritePin(GPIOA,GPIO_PIN_7,GPIO_PIN_RESET); //PA7 MOSI
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#define SCK_H HAL_GPIO_WritePin(GPIOA,GPIO_PIN_5,GPIO_PIN_SET); //PA5 SCK
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#define SCK_L HAL_GPIO_WritePin(GPIOA,GPIO_PIN_5,GPIO_PIN_RESET); //PA5 SCK
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#define CS_H HAL_GPIO_WritePin(GPIOA,GPIO_PIN_4,GPIO_PIN_SET); //PA4 CS1
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#define CS_L HAL_GPIO_WritePin(GPIOA,GPIO_PIN_4,GPIO_PIN_RESET); //PA4 CS1
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#define ADS1220_MISO HAL_GPIO_ReadPin(GPIOA,GPIO_PIN_6)
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#define ADS1220_DRDY HAL_GPIO_ReadPin(GPIOC,GPIO_PIN_4)
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#define DALAY_CNT 1000
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void ADS1220_GPIOInit(void)
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{
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GPIO_InitTypeDef GPIO_InitStructure;
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GPIO_InitStructure.Pin = GPIO_PIN_5|GPIO_PIN_7; //PA5 PA7 端口配置 MOSI&SCLK
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GPIO_InitStructure.Mode = GPIO_MODE_OUTPUT_PP; //推挽输出
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GPIO_InitStructure.Speed = GPIO_SPEED_FREQ_HIGH; //IO口速度为50MHz
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HAL_GPIO_Init(GPIOA, &GPIO_InitStructure); //根据设定参数初始化
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HAL_GPIO_WritePin(GPIOA,GPIO_PIN_5|GPIO_PIN_6,GPIO_PIN_SET);
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GPIO_InitStructure.Pin = GPIO_PIN_6; //端口配置 PA6 MISO
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GPIO_InitStructure.Mode = GPIO_MODE_INPUT; //上拉输入
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GPIO_InitStructure.Pull = GPIO_PULLUP ;
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HAL_GPIO_Init(GPIOA, &GPIO_InitStructure); //
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GPIO_InitStructure.Pin = GPIO_PIN_4; //端口配置 PC4 DRDY
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GPIO_InitStructure.Mode = GPIO_MODE_INPUT; //上拉输入
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GPIO_InitStructure.Pull = GPIO_PULLUP; //IO口速度为50MHz
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HAL_GPIO_Init(GPIOC, &GPIO_InitStructure);
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GPIO_InitStructure.Pin = GPIO_PIN_4; //端口配置 PA4 CS
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GPIO_InitStructure.Mode = GPIO_MODE_OUTPUT_PP; //推挽输出
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GPIO_InitStructure.Speed = GPIO_SPEED_FREQ_HIGH; //IO口速度为50MHz
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HAL_GPIO_Init(GPIOA, &GPIO_InitStructure);
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}
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/***************************************************************************
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函数名称:WriteOneByte(unsigned char 命令)
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用途:写入一个字节到ADS1220
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*************************************************************************/
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void WriteOneByte(unsigned char command)
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{
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unsigned char i;
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for(i = 0; i < 8;i++)
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{
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if(command&0x80)
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{
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DIN_H;//ADS1220_DIN = 1
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}
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else
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{
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DIN_L;//ADS1220_DIN = 0;/
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}
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command <<= 1;
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delay_us(10);
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SCK_H;//ADS1220_SCK = 1;
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delay_us(10);
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SCK_L;//ADS1220_SCK = 0;
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delay_us(10);
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}
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}
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/***************************************************************************
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*函数名称:ReadOneByte()
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*用途:从ADS1220读取一个字节
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*************************************************************************/
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unsigned char ReadOneByte(void)
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{
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unsigned char result,i;
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SCK_L;//SCLK_L;
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for(i = 0;i<8; i++)
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{
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SCK_H;
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delay_ns(1);
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result <<= 0x01;
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if(ADS1220_MISO)
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result |= 0X01;
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SCK_L;
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delay_ns(1);
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}
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return result;
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}
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/***************************************************************************
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*函数名称:ReadData()
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*用途:从ADS1220读取数据
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*************************************************************************/
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unsigned long ReadData(void)
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{
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unsigned long adval;
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unsigned char a,b,c;
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CS_L;
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delay_ns(10);
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WriteOneByte(RDATA);
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a = ReadOneByte();
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b = ReadOneByte();
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c = ReadOneByte();
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adval = a;
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adval = (adval<<8) | b;
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adval = (adval<<8) | c;
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delay_ns(10);
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CS_H;
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return adval;
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}
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/***************************************************************************
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*函数名称:ADReset()
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*用途:复位ADS1220
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*************************************************************************/
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void ADReset(void)
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{
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CS_L;
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delay_ns(1);
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WriteOneByte(RESET);
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CS_H;
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}
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/***************************************************************************
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函数名称:ADS1220_Init()
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*用途:ADS120初始化
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*************************************************************************/
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void ADS1220_Init(void)
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{
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CS_H;
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SCK_H;
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DIN_H;
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ADReset();
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}
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/***************************************************************************
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*函数名称:关闭电源()
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*************************************************************************/
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void ADPowerDown(void)
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{
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CS_L;
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WriteOneByte(POWERDOWN);
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CS_H;
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}
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/***************************************************************************
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*函数名称:ADStartConversion()
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*用途:开始转换
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*参数:
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*************************************************************************/
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void ADStartConversion(void)
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{
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CS_L;
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WriteOneByte(START);
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CS_H;
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}
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/***************************************************************************
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*函数名称:ReadRegister()
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*用途:从寄存器中读取数据
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*参数:数据
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*************************************************************************/
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void ReadRegister(void)
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{
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unsigned char i;
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unsigned long Data;
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CS_L;
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WriteOneByte(RREG|0x03);
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for (i=0; i< 4; i++)
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{
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Data += ReadOneByte();
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}
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CS_H;
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}
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/***************************************************************************
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*函数名:WriteRegister(unsigned char StartAddress, unsigned char NumRegs, unsigned char * pData)
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*用途:向寄存器写入数据
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*步骤:写地址2。写入数据
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* Params NumRegs-----寄存器的数字
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*************************************************************************/
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void WriteRegister(unsigned char StartAddress, unsigned char NumRegs, unsigned char * pData)
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{
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unsigned char i;
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CS_L;
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WriteOneByte(WREG | (((StartAddress<<2) & 0x0c) |((NumRegs-1)&0x03)));
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for (i=0; i< NumRegs; i++)
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{
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WriteOneByte(*pData);
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pData++;
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}
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CS_H;
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}
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/***************************************************************************
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函数名称:CofigAD(unsigned char channel)
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*用途:设置采样通道
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*参数:
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*************************************************************************/
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void CofigAD(unsigned char channel)
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{
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switch(channel)
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{
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case 0: Init_Config[0] = MUX_8 | PGA_0 | PGA_BYPASS_Disable;//单端模式，选择通道AINP = AIN0，AINN = AVSS ,PGA = 1,禁用PGA
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break;
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case 1: Init_Config[0] = MUX_9 | PGA_0 | PGA_BYPASS_Disable;//单端模式，选择通道AINP = AIN1，AINN = AVSS ,PGA = 1,禁用PGA
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break;
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case 2: Init_Config[0] = MUX_10 | PGA_0 | PGA_BYPASS_Disable;//单端模式，选择通道AINP = AIN2，AINN = AVSS,PGA = 1,禁用PGA
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break;
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case 3: Init_Config[0] = MUX_11 | PGA_0 | PGA_BYPASS_Disable;//单端模式，选择通道AINP = AIN3，AINN = AVSS,PGA = 1,禁用PGA
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break;
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case 4: Init_Config[0] = MUX_0 | PGA_0 | PGA_BYPASS_Disable;//差分模式，选择通道AINP = AIN0，AINN = AIN1（默认设置）,PGA = 1,禁用PGA
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break;
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}
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Init_Config[1] = 0XC0;
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Init_Config[2] = 0X00;
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Init_Config[3] = 0X00;
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WriteRegister(0x00,0x04,Init_Config);
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ReadRegister();
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}
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/***************************************************************************
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*函数名:GetAD(unsigned char channel)
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*目的:得到结果
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*************************************************************************/
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float GetAD(unsigned char channel)
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{
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float Result_f;
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unsigned long Result;
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unsigned long delay_cnt = 0;
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CofigAD(channel);
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ADStartConversion();
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while(ADS1220_DRDY)
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{
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delay_cnt++;
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if(delay_cnt > DALAY_CNT)
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{
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break;
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}
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}
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Result = ReadData();
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ADPowerDown();
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if(Result & 0x800000)
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{
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PolarFlag = 1;
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Result = ~Result;
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Result = Result&0xffffff;
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Result = Result+1;
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}
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else PolarFlag =0;
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Result_f = (float)Result*1000*2.499/(1048575) + 150;//20位精度
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Result_f /= 10.0;
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return Result_f;
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}
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