ADS1118 无法驱动

TongTong Sun SUN

Prodigy 101 points

Other Parts Discussed in Thread: ADS1118

最大的问题是当CS被拉低的时候，DOUT直接被拉高。导致读出来的数全部都为1.一直不理解这个是什么原因，求解答

10 年多前

0 Carter Liu 10 年多前

Guru 34090 points

初始化配置有问题吗？读寄存器有问题吗，还是只有转换过程有问题呢

0 TongTong Sun SUN 10 年多前回复 Carter Liu

Prodigy 101 points

我是参考网上的例子写的。读不到寄存器，都回来的值要不都为0，要不很奇怪。我把代码贴在下面

ADS1118的驱动

#include "ADS1118.h"

void ADS1118_Init(void)//端口初始化，GPIOCLK
{
GPIO_InitTypeDef GPIO_InitStructure;

RCC_APB2PeriphClockCmd(ADS1118_CLOCK, ENABLE);

GPIO_InitStructure.GPIO_Pin = Pin_ADS1118_CS;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_Init(GPIO_ADS1118_CS, &GPIO_InitStructure);

GPIO_InitStructure.GPIO_Pin = Pin_ADS1118_SCLK;
GPIO_Init(GPIO_ADS1118_SCLK, &GPIO_InitStructure);

GPIO_InitStructure.GPIO_Pin = Pin_ADS1118_DIN;
GPIO_Init(GPIO_ADS1118_DIN, &GPIO_InitStructure);

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_InitStructure.GPIO_Pin = Pin_ADS1118_DOUT;
GPIO_Init(GPIO_ADS1118_DOUT, &GPIO_InitStructure);

ADS1118_CS_1();
ADS1118_SCLK_1();
ADS1118_DIN_1();

}

u8 SPI_SendByte(u8 byte)
{
u8 i = 8;
u8 temp;
ADS1118_SCLK_1();
ADS1118_DIN_1();
while(i--)
{
if(byte&0x80)
ADS1118_DIN_1();
else
ADS1118_DIN_0();
ADS1118_SCLK_0();
byte<<=1;
delay_us(1);
ADS1118_SCLK_1();
delay_us(1);
if(DOUT_Set)
temp |= 1;
temp<<=1;
}
return temp;
}
u32 SPI_RW_Reg(u16 CofigReg)
{

u8 readdata1;
u8 readdata2;
u8 readdata3;
u8 readdata4;
u32 data;
readdata1=SPI_SendByte((uint8_t)(CofigReg>>8));
readdata2=SPI_SendByte((uint8_t)CofigReg);
readdata3=SPI_SendByte((uint8_t)(CofigReg>>8));
readdata4=SPI_SendByte((uint8_t)CofigReg);
data= ((uint32_t)readdata1<<8)|((uint32_t)readdata2);

//ads_cs_1();
return data;
}

主函数

#include "led.h"
#include "delay.h"
#include "sys.h"
#include "usart.h"
#include "ads1118.h"
#include "delay.h"

u32 AdValue=0;
uint16_t count=0xC583;

int main(void)
{

delay_init(); //延时函数初始化
NVIC_Configuration(); //设置NVIC中断分组2:2位抢占优先级，2位响应优先级
uart_init(9600); //串口初始化为9600
LED_Init();
ADS1118_Init();
while(1)
{
LED1 =!LED1 ;
AdValue=SPI_RW_Reg(count);
printf ("%d\r\n",AdValue);
delay_ms(100);

}
}

0 TongTong Sun SUN 10 年多前回复 TongTong Sun SUN

Prodigy 101 points

有一句代码忘了附了，那个SPI发送一个bit是有一句把CS拉低

0 Carter Liu 10 年多前回复 TongTong Sun SUN

Guru 34090 points

你这代码，并没有初始化配置寄存器的部分啊

0 TongTong Sun SUN 10 年多前回复 Carter Liu

Prodigy 101 points

AdValue=SPI_RW_Reg(count); count数值为0xc583,这样做不行吗，配置寄存器是哪里弄的啊

0 TongTong Sun SUN 10 年多前回复 Carter Liu

Prodigy 101 points

我再数据手册里面19页看到这样一句话

When the PWDN bit in the Config Register is set to '1', the ADS1118 enters a lower power standby state. This condition is also the default state the ADS1118 enters when power is first supplied. In this mode, the ADS1118 uses no more than 2μA of current. During this time, the device responds to commands, but does not perform any data conversion. To exit this mode, simply write a '0' to the PWDN bit in the Config Register.

他说电源上电的时候PWDN位为1，想应命令但是不执行任何数据转换，这个地方是怎么理解呢，我在Config Register的十六位寄存器并没有看到PWDN?