【生物传感器评估平台MAX30001GEVKIT】使用STM32采集传感器数据

qinyunti 发表于 2023-9-10 00:47

<h1>原理图</h1>

使用STM32的SPI1引脚 PA4-PA7

  

 

断开如下4个跳线1和2引脚的短接，STM32的PA4-7接如下4个跳线处3引脚。

  

 

<h1 >接口与寄存器</h1>

MAX30001g的SPI接口时序如下

支持模式0和3，MSB，最大12M，详见手册

 

  

 

寄存器

  

  

 

<h1 >代码</h1>

 

<h2 >SPI接口</h2>

void max30001g_spi_trans(uint8_t sendval, uint8_t* readval)

{

 

SPI_I2S_SendData(SPI1, (uint8_t)sendval);

*readval = (uint8_t)(SPI_I2S_ReceiveData(SPI1));

}

 

void max30001g_spi_cs(uint8_t cs)

{

if(cs)

  {

      GPIO_SetBits(GPIOA, GPIO_Pin_4);

}

else

  {

      GPIO_ResetBits(GPIOA, GPIO_Pin_4);

}

}

 

void spi_init()

{

GPIO_InitTypeDef GPIO_InitStruct;

SPI_InitTypeDef SPI_InitStruct;

RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA,ENABLE);

/* PA4 - CS

   PA5 - SCK

 PA6 - MISO

 PA7 - MOSI

*/

GPIO_StructInit(&GPIO_InitStruct);

GPIO_InitStruct.GPIO_Pin = GPIO_Pin_5;

GPIO_InitStruct.GPIO_Speed =GPIO_Speed_50MHz;

GPIO_InitStruct.GPIO_Mode = GPIO_Mode_AF_PP;

GPIO_Init(GPIOA, &GPIO_InitStruct);

 

GPIO_InitStruct.GPIO_Pin = GPIO_Pin_6;

GPIO_Init(GPIOA, &GPIO_InitStruct);

 

GPIO_InitStruct.GPIO_Pin = GPIO_Pin_7;

GPIO_Init(GPIOA, &GPIO_InitStruct);

 

GPIO_InitStruct.GPIO_Speed =GPIO_Speed_50MHz;

GPIO_InitStruct.GPIO_Mode = GPIO_Mode_Out_PP;

GPIO_InitStruct.GPIO_Pin = GPIO_Pin_4;

GPIO_Init(GPIOA, &GPIO_InitStruct);

 

/* SPI1 */

RCC_APB2PeriphClockCmd(RCC_APB2Periph_SPI1,ENABLE);

  SPI_StructInit(&SPI_InitStruct);

SPI_InitStruct.SPI_Direction = SPI_Direction_2Lines_FullDuplex;

SPI_InitStruct.SPI_Mode = SPI_Mode_Master;

SPI_InitStruct.SPI_DataSize = SPI_DataSize_8b;

SPI_InitStruct.SPI_CPOL = SPI_CPOL_High;

SPI_InitStruct.SPI_CPHA = SPI_CPHA_2Edge;

SPI_InitStruct.SPI_NSS = SPI_NSS_Soft;

SPI_InitStruct.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_16; /*72/16M*/

SPI_InitStruct.SPI_FirstBit = SPI_FirstBit_MSB;

SPI_Init(SPI1, &SPI_InitStruct);

SPI_Cmd(SPI1, ENABLE);

}

 

<h2 >寄存器操作</h2>

 

<h2 >测试</h2>

spi_init();

while(1)

  {

  max30001g_read_reg(0x21,&(rx_buffer));

  max30001g_read_reg(0x23,&(rx_buffer));

  max30001g_read_reg(0x25,&(rx_buffer));

  max30001g_read_reg(0x01,&(rx_buffer));

}

 

<pre>
<code class="language-cpp">
#include <stdint.h>

extern void max30001g_spi_trans(uint8_t sendval, uint8_t* readval);
extern void max30001g_spi_cs(uint8_t);

int max30001g_read_reg(uint8_t reg, uint32_t* val)
{
uint8_t readval;
uint32_t tmp = 0;
max30001g_spi_cs(0);
max30001g_spi_trans((reg<<1)|0x01, &readval);/* A6-A0 bit0=1 R*/
max30001g_spi_trans(0xFF, &readval); /* D23-D16*/
readval |= (uint32_t)readval<<16;
max30001g_spi_trans(0xFF, &readval); /* D15-D8*/
readval |= (uint32_t)readval<<8;
max30001g_spi_trans(0xFF, &readval); /* D7-D0*/
readval |= (uint32_t)readval<<0;
max30001g_spi_cs(1);
*val = tmp;
return 0;
}

int max30001g_write_reg(uint8_t reg, uint32_t val)
{
uint8_t readval;
max30001g_spi_cs(0);
max30001g_spi_trans((reg<<1)|0x00, &readval);/* A6-A0 bit0=0 W*/
max30001g_spi_trans((val>>16) & 0xFF, &readval);/* D23-D16*/
max30001g_spi_trans((val>>8) & 0xFF, &readval);/* D15-D8*/
max30001g_spi_trans((val>>0) & 0xFF, &readval);/* D7-D0*/
max30001g_spi_cs(1);
return 0;
}

</code></pre>

 

<pre>
<code class="language-cpp">#ifndef MAX30001G_H
#define MAX30001G_H

#include <stdint.h>
int max30001g_read_reg(uint8_t reg, uint32_t* val);
int max30001g_write_reg(uint8_t reg, uint32_t val);

#endif
</code></pre>

lugl4313820 发表于 2023-9-10 10:54

各位原理代码都非常详细，感谢分享！

Jacktang 发表于 2023-9-10 21:22

寄存器操作还是感觉有点稍微麻烦一些

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【生物传感器评估平台MAX30001GEVKIT】使用STM32采集传感器数据