ADS1220 24位高精度ADC芯片驱动

芯片引脚及功能描述：

驱动代码：
头文件：ads1220.h

#ifndef __ADS1220_H
#define __ADS1220_H#include "em_device.h"
#include "em_gpio.h"
#include "em_cmu.h"#include "em_usart.h"
#include "sl_udelay.h"
#include <math.h>
#include <stdio.h>
#include <string.h>#include "../autogen/sl_spidrv.h"
#include "spidrv.h"
#include "em_assert.h"
#include "sl_spidrv_spiflash_config.h"
#include "sl_spidrv.h"#define    CLK_PERIOD_UNIT                26 // unit: ns#define    MIN_CYCLE_PER_INST        1  // cycle count of one instruction
#define    ONE_LOOP_INIT             10 // instruction count of one loop (estimate)#define    TPUW             10000000       // 10ms#define    ADS1220_FULL_ACCESS_TIME         TPUW / (CLK_PERIOD_UNIT * MIN_CYCLE_PER_INST * ONE_LOOP_INIT)/* Fallback to loc 11 if no location is defined for backwards compatibility */
#ifndef ADS1220_LOC_RX
#define ADS1220_LOC_RX            _USART_ROUTELOC0_RXLOC_LOC11
#endif
#ifndef ADS1220_LOC_SCLK
#define ADS1220_LOC_SCLK          _USART_ROUTELOC0_CLKLOC_LOC11
#endif
#ifndef ADS1220_LOC_TX
#define ADS1220_LOC_TX            _USART_ROUTELOC0_TXLOC_LOC11
#endif
/* Fallback to baudrate of 8 MHz if not defined for backwards compatibility */
#ifndef ADS1220_BAUDRATE
#define ADS1220_BAUDRATE   8000000
#endif#define ADS1220_PORT_DRDY         gpioPortC
#define ADS1220_PIN_DRDY          4#define ADS1220_USART             USART0
#define ADS1220_USART_CLK         cmuClock_USART0#define ADS1220_RESET_COMMAND       0x06
#define ADS1220_START_COMMAND       0x08
#define ADS1220_POWERDOWN_COMMAND   0x02
#define ADS1220_RDATA_COMMAND       0x10
#define ADS1220_RREG_COMMAND        0x20
#define ADS1220_WREG_COMMAND        0x40#define ADS1220_CONFIG_REG0         0x00
#define ADS1220_CONFIG_REG1         0X01
#define ADS1220_CONFIG_REG2         0x02
#define ADS1220_CONFIG_REG3         0x03#define SUCCESS 0
#define ERROR   1#define  lint32_t long int#define CS_SET(status)   {if(status)  GPIO_PinOutSet( SL_SPIDRV_SPIFLASH_CS_PORT, SL_SPIDRV_SPIFLASH_CS_PIN );\else GPIO_PinOutClear( SL_SPIDRV_SPIFLASH_CS_PORT, SL_SPIDRV_SPIFLASH_CS_PIN );}#define CHECK_RETURN_IS_SUCCESS(ret, tips)  if(ret != SUCCESS) \{\printf("[ERROR] %s:%ld\r\n", tips, ret);\return ERROR;\}void ads1220_init(void);
uint32_t ads1220_write_one_byte(unsigned char command);
uint32_t ads1220_read_one_byte( uint8_t *recv_data );
uint32_t ads1220_read_data(lint32_t *result );
uint32_t ads1220_reset(void);
uint32_t ads1220_powerdown(void);
uint32_t ads1220_start_conversion(void);
uint32_t ads1220_read_register(lint32_t *Data);
uint32_t ads1220_write_register(unsigned char StartAddress, unsigned char NumRegs, unsigned char * pData);
uint32_t ads1220_connfig(unsigned char channel);
void ads1220_set_channel_PGA(unsigned char channel, unsigned char gain);
uint32_t ads1220_get_adc_value(uint8_t channel, lint32_t *voltage);
void clk_delay(uint16_t delay_time );
void ads1220_test_process(void);
void ads1220_printf_channel_vol(uint8_t test_num, uint8_t channel);
#endif

源文件：ads1220.c

#include "ads1220.h"unsigned char channel0[8] = {};
unsigned char channel1[8] = {};
unsigned char Init_Config[8] = {};void ads1220_init( void )
{CMU_ClockEnable( cmuClock_GPIO, true );GPIO_PinModeSet( SL_SPIDRV_SPIFLASH_CS_PORT,   SL_SPIDRV_SPIFLASH_CS_PIN,   gpioModePushPull, 1 );GPIO_PinModeSet( ADS1220_PORT_DRDY,   ADS1220_PIN_DRDY, gpioModeInput, 0 );
}uint32_t ads1220_write_one_byte( uint8_t byte_value)
{uint32_t ret = SPIDRV_MTransmitB(sl_spidrv_spiflash_handle, &byte_value, 1);CHECK_RETURN_IS_SUCCESS(ret, "SPIDRV_MTransmitB error! Error code");return SUCCESS;
}uint32_t ads1220_read_one_byte( uint8_t *recv_data )
{uint32_t ret = 1;ret = SPIDRV_MReceiveB( sl_spidrv_spiflash_handle, recv_data, 1 );CHECK_RETURN_IS_SUCCESS(ret, "SPIDRV_MReceiveB error! Error code");return SUCCESS;
}uint32_t ads1220_read_data(lint32_t *result )
{uint32_t ret = 1;unsigned char recv_buf = 0;CS_SET(0);ret = ads1220_write_one_byte(ADS1220_RDATA_COMMAND);CHECK_RETURN_IS_SUCCESS(ret, "ads1220_write_one_byte error! Error code");while(GPIO_PinInGet(ADS1220_PORT_DRDY, ADS1220_PIN_DRDY));ret = ads1220_read_one_byte(&recv_buf);CHECK_RETURN_IS_SUCCESS(ret, "ads1220_read_one_byte error! Error code");*result = recv_buf;ret = ads1220_read_one_byte( &recv_buf);CHECK_RETURN_IS_SUCCESS(ret, "ads1220_read_one_byte error! Error code");*result = (*result << 8)|recv_buf;ret = ads1220_read_one_byte( &recv_buf);CHECK_RETURN_IS_SUCCESS(ret, "ads1220_read_one_byte error! Error code");*result = (*result << 8)|recv_buf;CS_SET(1);
//    printf("result = 0x%0lx   %ld\r\n", *result, *result);if (*result & 0x800000){*result |= 0xff000000;printf("result |= 0xff000000");}return SUCCESS;
}uint32_t ads1220_reset(void)
{uint32_t ret = 1;CS_SET(0);clk_delay(40);ret = ads1220_write_one_byte(ADS1220_RESET_COMMAND);CHECK_RETURN_IS_SUCCESS(ret, "ads1220_write_one_byte error! Error code");clk_delay(40);CS_SET(1);clk_delay(40);return SUCCESS;
}uint32_t ads1220_powerdown(void)
{uint32_t ret = 1;CS_SET(0);clk_delay(40);ret = ads1220_write_one_byte(ADS1220_POWERDOWN_COMMAND);CHECK_RETURN_IS_SUCCESS(ret, "ads1220_write_one_byte error! Error code");clk_delay(40);CS_SET(1);clk_delay(40);return SUCCESS;
}uint32_t ads1220_start_conversion(void)
{uint32_t ret = 1;CS_SET(0);clk_delay(80);ret = ads1220_write_one_byte(ADS1220_START_COMMAND);CHECK_RETURN_IS_SUCCESS(ret, "ads1220_write_one_byte error! Error code");clk_delay(80);CS_SET(1);clk_delay(80);return SUCCESS;
}uint32_t ads1220_read_register(lint32_t *Data)
{uint32_t ret = 1;unsigned char recv_buf = 0;CS_SET(0);clk_delay(80);ret = ads1220_write_one_byte(ADS1220_RREG_COMMAND|0x03);CHECK_RETURN_IS_SUCCESS(ret, "ads1220_write_one_byte error! Error code");ret = ads1220_read_one_byte( &recv_buf);CHECK_RETURN_IS_SUCCESS(ret, "ads1220_read_one_byte error! Error code");*Data = recv_buf;ret = ads1220_read_one_byte(&recv_buf);CHECK_RETURN_IS_SUCCESS(ret, "ads1220_read_one_byte error! Error code");*Data =  (*Data << 8)|recv_buf;ret = ads1220_read_one_byte( &recv_buf);CHECK_RETURN_IS_SUCCESS(ret, "ads1220_read_one_byte error! Error code");*Data = (*Data << 8)|recv_buf;ret = ads1220_read_one_byte(&recv_buf);CHECK_RETURN_IS_SUCCESS(ret, "ads1220_read_one_byte error! Error code");*Data = (*Data << 8)|recv_buf;CS_SET(1);clk_delay(80);return SUCCESS;
}uint32_t ads1220_write_register(unsigned char StartAddress, unsigned char NumRegs, unsigned char * pData)
{unsigned char i;uint32_t ret = 1;CS_SET(0);clk_delay(80);// send the command byteret = ads1220_write_one_byte(ADS1220_WREG_COMMAND | (((StartAddress<<2) & 0x0c) |((NumRegs-1)&0x03)));CHECK_RETURN_IS_SUCCESS(ret, "ads1220_write_one_byte error! Error code");// send the data bytesfor (i=0; i< NumRegs; i++){ret = ads1220_write_one_byte(*pData);CHECK_RETURN_IS_SUCCESS(ret, "ads1220_write_one_byte error! Error code");pData++;}CS_SET(1);return SUCCESS;
}/** 函数说明：ads1220设置配置寄存器，包括多路复用选择、增益配置、数据速率*          工作模式、转换模式、基准电压选择等设置* 参数：channel  通道选择   1-3可选* 返回值：设置成功返回SUCCESS，失败返回ERROR** */
uint32_t ads1220_config(unsigned char channel) // 0-1-2-3
{uint32_t ret = 1;lint32_t data = 0;switch(channel){case 0: Init_Config[0] = 0x81;break;case 1: Init_Config[0] = 0x91;break;case 2: Init_Config[0] = 0xA1;break;case 3: Init_Config[0] = 0xB1;break;}Init_Config[1] = 0X40;//90SPSInit_Config[2] = 0X10; /* 同时抑制50Hz和60Hz IDAC电流关断 */Init_Config[3] = 0X00;ret = ads1220_write_register(ADS1220_CONFIG_REG0,0x04,Init_Config);CHECK_RETURN_IS_SUCCESS(ret, "ads1220_write_one_byte error! Error code");ret = ads1220_read_register(&data);CHECK_RETURN_IS_SUCCESS(ret, "ads1220_read_register error! Error code");return SUCCESS;
}void ads1220_set_channel_PGA(unsigned char channel, unsigned char gain)
{switch(channel){case 0:if(gain==1)channel0[0] = 0x81;if(gain==2)channel0[1] = 0x83;if(gain==4)channel0[2] = 0x85;if(gain==8)channel0[3] = 0x87;if(gain==16)channel0[4] = 0x89;if(gain==32)channel0[5] = 0x8B;if(gain==64)channel0[6] = 0x8D;if(gain==128)channel0[7] = 0x8F;break;case 1:if(gain==1)channel1[0] = 0x91;if(gain==2)channel1[1] = 0x93;if(gain==4)channel1[2] = 0x95;if(gain==8)channel1[3] = 0x97;if(gain==16)channel1[4] = 0x99;if(gain==32)channel1[5] = 0x9B;if(gain==64)channel1[6] = 0x9D;if(gain==128)channel0[7] = 0x9F;break;case 2: Init_Config[0] = 0xA1;break;case 3: Init_Config[0] = 0xB1;break;}
}uint32_t ads1220_get_adc_value(uint8_t channel, lint32_t *voltage) // 0-1-2-3
{uint32_t ret = 1;ret = ads1220_config(channel);CHECK_RETURN_IS_SUCCESS(ret, "ads1220_config error! Error code");ret = ads1220_start_conversion();CHECK_RETURN_IS_SUCCESS(ret, "ads1220_start_conversion error! Error code");ret = ads1220_read_data(voltage);CHECK_RETURN_IS_SUCCESS(ret, "ads1220_read_data error! Error code");return SUCCESS;
}void clk_delay(uint16_t delay_time )
{//  delay_time = delay_time*2;while( delay_time>0 ){delay_time--;}
}void ads1220_printf_channel_vol(uint8_t test_num, uint8_t channel)
{lint32_t adc_value = 0;uint32_t ret = 1;double res_value = 0.0;char vol_buf[50] = {0};ret = ads1220_get_adc_value(1, &adc_value);if(ret != SUCCESS){printf("[ERROR] ads1220_get_adc_value error! Error code %ld\r\n", ret);return;}res_value = 100/(2.048/8388608*adc_value-1.25);sprintf(vol_buf, "test num: %d   channel: %d  res: %dK\r\n", test_num, channel ,(int)res_value);printf("%s", vol_buf);
}void ads1220_test_process(void)
{lint32_t adc_value = 0;uint32_t ret = 1;double vol_value = 0.0;char vol_buf[20] = {0};ret = ads1220_get_adc_value(0, &adc_value);if(ret != SUCCESS){printf("[ERROR] ads1220_get_adc_value error! Error code %ld\r\n", ret);return;}vol_value = 2.048/8388608*adc_value;sprintf(vol_buf, "AIN0 vol: %lf\r\n", vol_value);printf("%s", vol_buf);ret = ads1220_get_adc_value(1, &adc_value);if(ret != SUCCESS){printf("[ERROR] ads1220_get_adc_value error! Error code %ld\r\n", ret);return;}vol_value = 2.048/8388608*adc_value;sprintf(vol_buf, "AIN1 vol: %lf\r\n\r\n", vol_value);printf("%s", vol_buf);sl_udelay_wait(1000000);
}

注：
ads1220为SPI驱动，仅支持SPI模式1（CPOL = 0 CPHA = 1）
上述代码可直接运行在芯科科技的EFR32BG22中
需要移植到自己的芯片中需要替换掉对应的部分（gpio驱动；延时；如果使用硬件spi还需要适配对应的硬件spi驱动）。

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