基于STM32F1的VEML7700环境光传感器的使用代码

最新推荐文章于 2024-10-17 13:18:25 发布

桂北研猛男

最新推荐文章于 2024-10-17 13:18:25 发布

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文章标签： stm32 嵌入式硬件单片机

本文链接：https://blog.youkuaiyun.com/m0_62240287/article/details/137084568

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本文章基于STM32F1 HAL库文件下进行编写测试的代码，VEML7700传感器采用IIC通信，本实验为大学本科的课程设计，已经测试成功，均可在数码管和OLED上进行显示，效果如下：

在黑暗的环境下的光强（单位 lux）：

在手机灯光照射下的光强（单位 lux）：

现贴如代码如下：

iic.c

#include <stdio.h>

#include "i2c.h"
#include "update.h"
#include <string.h>

#if I2C1_MODE == I2C1_MODE_POLL
/**
 * PB10 PB11 config I2C1
*/
void i2c1_config(void)
{
    /* enable GPIOB clock */
    rcu_periph_clock_enable(RCU_GPIOB);
    /* enable I2C1 clock */
    rcu_periph_clock_enable(RCU_I2C1);
    /* connect PB10 to I2C1_SCL */
    /* connect PB11 to I2C2_SDA */
    gpio_init(GPIOB, GPIO_MODE_AF_OD, GPIO_OSPEED_50MHZ, GPIO_PIN_10 | GPIO_PIN_11);//配置PB10,PB11为复用功能

    /* configure I2C clock */
    i2c_clock_config(I2C1, I2C1_SPEED, I2C_DTCY_2);
    /* configure I2C address */
    i2c_mode_addr_config(I2C1, I2C_I2CMODE_ENABLE, I2C_ADDFORMAT_7BITS, I2C1_SLAVE_ADDR);
    /* enable I2C1 */
    i2c_enable(I2C1);
    /* enable acknowledge */
    i2c_ack_config(I2C1, I2C_ACK_ENABLE);
}

void i2c1_write_data_by_reg(uint8_t slave_addr,uint8_t* p_buffer, uint8_t write_address, uint8_t number_of_byte)
{
    /* 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 */
    i2c_master_addressing(I2C1, slave_addr, I2C_TRANSMITTER);
    
    /* 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 transmit data buffer is empty */
    while( SET != i2c_flag_get(I2C1, I2C_FLAG_TBE));
    
    /* send the EEPROM's internal address to write to : only one byte address */
    i2c_data_transmit(I2C1, write_address);
    
    /* wait until BTC bit is set */
    while(!i2c_flag_get(I2C1, I2C_FLAG_BTC));
    
    /* while there is data to be written */
    while(number_of_byte--){  
        i2c_data_transmit(I2C1, *p_buffer);
        
        /* point to the next byte to be written */
        p_buffer++; 
        
        /* wait until BTC bit is set */
        while(!i2c_flag_get(I2C1, I2C_FLAG_BTC));
    }
    /* send a stop condition to I2C bus */
    i2c_stop_on_bus(I2C1);
    
    /* wait until the stop condition is finished */
    while(I2C_CTL0(I2C1)&0x0200);
}

void i2c1_read_data_by_reg(uint8_t slave_addr,uint8_t* p_buffer, uint8_t read_address, uint16_t number_of_byte)
{  
    /* wait until I2C bus is idle */
    while(i2c_flag_get(I2C1, I2C_FLAG_I2CBSY));

    if(2 == number_of_byte){
        i2c_ackpos_config(I2C1,I2C_ACKPOS_NEXT);
    }
    
    /* 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 */
    i2c_master_addressing(I2C1, slave_addr, I2C_TRANSMITTER);
    
    /* 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 transmit data buffer is empty */
    while(SET != i2c_flag_get( I2C1 , I2C_FLAG_TBE));

    /* enable I2C1*/
    i2c_enable(I2C1);
    
    /* send the EEPROM's internal address to write to */
    i2c_data_transmit(I2C1, read_address);  
    
    /* wait until BTC bit is set */
    while(!i2c_flag_get(I2C1, I2C_FLAG_BTC));
    
    /* 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 */
    i2c_master_addressing(I2C1, slave_addr, I2C_RECEIVER);

    if(number_of_byte < 3){
        /* disable acknowledge */
        i2c_ack_config(I2C1,I2C_ACK_DISABLE);
    }
    
    /* 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);
    
    if(1 == number_of_byte){
        /* send a stop condition to I2C bus */
        i2c_stop_on_bus(I2C1);
    }
    
    /* while there is data to be read */
    while(number_of_byte){
        if(3 == number_of_byte){
            /* wait until BTC bit is set */
            while(!i2c_flag_get(I2C1, I2C_FLAG_BTC));

            /* disable acknowledge */
            i2c_ack_config(I2C1,I2C_ACK_DISABLE);
        }
        if(2 == number_of_byte){
            /* wait until BTC bit is set */
            while(!i2c_flag_get(I2C1, I2C_FLAG_BTC));
            
            /* send a stop condition to I2C bus */
            i2c_stop_on_bus(I2C1);
        }
        
        /* wait until the RBNE bit is set and clear it */
        if(i2c_flag_get(I2C1, I2C_FLAG_RBNE)){
            /* read a byte from the EEPROM */
            *p_buffer = i2c_data_receive(I2C1);
            
            /* point to the next location where the byte read will be saved */
            p_buffer++; 
            
            /* decrement the read bytes counter */
            number_of_byte--;
        } 
    }
    
    /* wait until the stop condition is finished */
    while(I2C_CTL0(I2C1)&0x0200);
    
    /* enable acknowledge */
    i2c_ack_config(I2C1,I2C_ACK_ENABLE);

    i2c_ackpos_config(I2C1,I2C_ACKPOS_CURRENT);
}

#elif I2C1_MODE == I2C1_MODE_DMA
uint8_t i2c1_buff_rx[128];

static void i2c1_dma_rx_config(uint8_t *p_data,uint8_t len)
{
    dma_parameter_struct dma_init_struct;
    /* initialize DMA channel4 */
    dma_deinit(DMA0, DMA_CH4);
    dma_init_struct.direction = DMA_PERIPHERAL_TO_MEMORY;
    dma_init_struct.memory_addr = (uint32_t)p_data;
    dma_init_struct.memory_inc = DMA_MEMORY_INCREASE_ENABLE;
    dma_init_struct.memory_width = DMA_MEMORY_WIDTH_8BIT;
    dma_init_struct.number = len;
    dma_init_struct.periph_addr = (uint32_t)&I2C_DATA(I2C1);
    dma_init_struct.periph_inc = DMA_PERIPH_INCREASE_DISABLE;
    dma_init_struct.periph_width = DMA_PERIPHERAL_WIDTH_8BIT;
    dma_init_struct.priority = DMA_PRIORITY_ULTRA_HIGH;
    dma_init(DMA0, DMA_CH4, &dma_init_struct);
}

static void i2c1_dma_tx_config(uint8_t *p_data,uint8_t len)
{
    dma_parameter_struct dma_init_struct;
    /* initialize DMA channel3 */
    dma_deinit(DMA0, DMA_CH3);
    dma_init_struct.direction = DMA_MEMORY_TO_PERIPHERAL;
    dma_init_struct.memory_addr = (uint32_t)p_data;
    dma_init_struct.memory_inc = DMA_MEMORY_INCREASE_ENABLE;
    dma_init_struct.memory_width = DMA_MEMORY_WIDTH_8BIT;
    dma_init_struct.number = len;
    dma_init_struct.periph_addr = (uint32_t)&I2C_DATA(I2C1);
    dma_init_struct.periph_inc = DMA_PERIPH_INCREASE_DISABLE;
    dma_init_struct.periph_width = DMA_PERIPHERAL_WIDTH_8BIT;
    dma_init_struct.priority = DMA_PRIORIT