【瑞萨RA-eco-RA6M4评测】读取I2C接口光照接近传感器RPR-0521RS
本次学习读取I2C接口光照接近传感器RPR-0521RS的光照值和接近距离数据。RPR-0521RS是将光学式接近传感器和红外LED（IrLED）、数字照度传感器整合在一起的传感器。 接近传感器 (PS)通过对IrLED发射光线的接近物产生的反射光，检测出人及物体的接近。另外，照度传感器(ALS)可测量从昏暗光线到直射日光的广泛照度。根据照度数据调整LCD显示器及按键的亮度，从而提高组件的节电性能和画面的可视性。
### RPR-0521RS系列光学传感器特点：
* 兼容I2C BUS接口（支持f/s模式）； ·
* 兼容1.8V逻辑接口；
* 掉电模式下，电流损耗低；
* 有两种ALS输出值：可见光（Data0）对应光谱响应峰值；红外线光（Data1）对应光照度计算。
* 能检测到从黑暗环境乃至直接太阳光照的环境范围，具有广泛的照度测量；
* 具有抑制（工频）50Hz/60Hz光噪声（ALS功能下）；
* 光学接近传感探测范围在1~100mm(可通过I2C接口调整)；
* 内置电流配置的IrLED驱动器；
### 传感器和开发板连接如下：
传感器使用I2C引脚外设，电路图位置如下：
!(https://www.eefocus.com/forum/data/attachment/forum/202608/09/152828btg2jwmwnwjows4j.png)
硬件连接如下：
!(https://www.eefocus.com/forum/data/attachment/forum/202608/09/152737ykuujuyyf6lxhmwm.png)
接着添加RPR-0521RS驱动代码：
```
#include "drv_rpr0521rs.h"
#define I2C_NUM 0
uint8_t _als_data0_gain,_als_data1_gain;
uint16_t _als_measure_time;
uint8_t RPR0521RS_Init(void)
{
uint8_t temp,index;
uint8_t als_gain_table[] = {1, 2, 64, 128};
uint16_t als_meas_time_table[] = {0,0,0,0,0,100,100,100,100,100,400,400,50,0,0,0};
temp = I2C_ReadByte(I2C_NUM, RPR0521RS_DEVICE_ADDRESS, RPR0521RS_MANUFACT_ID);
if(temp != RPR0521RS_MANUFACT_ID_VAL)
{
return 1;
}
temp = I2C_ReadByte(I2C_NUM, RPR0521RS_DEVICE_ADDRESS, RPR0521RS_SYSTEM_CONTROL);
if((temp&0x3f) != RPR0521RS_PART_ID_VAL)
{
return 1;
}
I2C_WriteByte(I2C_NUM, RPR0521RS_DEVICE_ADDRESS, RPR0521RS_ALS_PS_CONTROL, RPR0521RS_ALS_PS_CONTROL_VAL);
temp = I2C_ReadByte(I2C_NUM, RPR0521RS_DEVICE_ADDRESS, RPR0521RS_PS_CONTROL);
temp |= RPR0521RS_PS_CONTROL_VAL;
I2C_WriteByte(I2C_NUM, RPR0521RS_DEVICE_ADDRESS, RPR0521RS_PS_CONTROL, temp);
I2C_WriteByte(I2C_NUM, RPR0521RS_DEVICE_ADDRESS, RPR0521RS_MODE_CONTROL, RPR0521RS_MODE_CONTROL_VAL);
temp = RPR0521RS_ALS_PS_CONTROL_VAL;
index = (temp >> 4) & 0x03;
_als_data0_gain = als_gain_table;
index = (temp >> 2) & 0x03;
_als_data1_gain = als_gain_table;
index = RPR0521RS_MODE_CONTROL_VAL & 0x0F;
_als_measure_time = als_meas_time_table;
return 0;
}
void RPR0521RS_get_rawdata(uint8_t *buff)
{
I2C_PageRead(I2C_NUM, RPR0521RS_DEVICE_ADDRESS,
RPR0521RS_PS_DATA_LSB,
buff, 6);
}
float RPR0521RS_convert_lx(unsigned short *f)
{
float lx;
float d0, d1, d1_d0;
if (_als_data0_gain == 0) {
return (-1);
}
if (_als_data1_gain == 0) {
return (-1);
}
if (_als_measure_time == 0)
{
return (-1);
} else if (_als_measure_time == 50)
{
if ((f & 0x8000) == 0x8000)
{
f = 0x7FFF;
}
if ((f & 0x8000) == 0x8000)
{
f = 0x7FFF;
}
}
d0 = (float)f * (100 / _als_measure_time) / _als_data0_gain;
d1 = (float)f * (100 / _als_measure_time) / _als_data1_gain;
if (d0 == 0) {
lx = 0;
return (lx);
}
d1_d0 = d1 / d0;
if (d1_d0 < 0.595) {
lx = (1.682 * d0 - 1.877 * d1);
} else if (d1_d0 < 1.015) {
lx = (0.644 * d0 - 0.132 * d1);
} else if (d1_d0 < 1.352) {
lx = (0.756 * d0 - 0.243 * d1);
} else if (d1_d0 < 3.053) {
lx = (0.766 * d0 - 0.25 * d1);
} else {
lx = 0;
}
return (lx);
}
void RPR0521RS_get_psalsval(unsigned int *ps, float *als)
{
unsigned char val;
unsigned short rawps;
unsigned short rawals;
RPR0521RS_get_rawdata(val);
rawps = ((unsigned short)val << 8) | val;
rawals = ((unsigned short)val << 8) | val;
rawals = ((unsigned short)val << 8) | val;
*ps= rawps;
*als = RPR0521RS_convert_lx(rawals);
}
uint8_t RPR0521RS_read_int(void)
{
return I2C_ReadByte(I2C_NUM, RPR0521RS_DEVICE_ADDRESS, RPR0521RS_INTERRUPT_CONTROL);
}
void RPR0521RS_write_int(uint8_t intvalue)
{
I2C_WriteByte(I2C_NUM, RPR0521RS_DEVICE_ADDRESS, RPR0521RS_INTERRUPT_CONTROL,intvalue);
}
void RPR0521RS_Set_PS_threshold(uint16_t ps_high,uint16_t ps_low)
{
uint8_t buff;
buff = ps_high&0xff;
buff = (ps_high>>8)&0x0f;
buff = ps_low&0xff;
buff = (ps_low>>8)&0x0f;
I2C_PageWrite(I2C_NUM, RPR0521RS_DEVICE_ADDRESS,
RPR0521RS_PS_TH_LSB,
buff, 4);
}
void RPR0521RS_Set_ALS_threshold(uint16_t als_high,uint16_t als_low)
{
uint8_t buff;
buff = als_high&0xff;
buff = (als_high>>8)&0xff;
buff = als_low&0xff;
buff = (als_low>>8)&0xff;
I2C_PageWrite(I2C_NUM, RPR0521RS_DEVICE_ADDRESS,
RPR0521RS_PS_TH_LSB,
buff, 4);
}
void RPR0521RS_power_down(void)
{
I2C_WriteByte(I2C_NUM, RPR0521RS_DEVICE_ADDRESS, RPR0521RS_SYSTEM_CONTROL,0x80);
I2C_WriteByte(I2C_NUM, RPR0521RS_DEVICE_ADDRESS, RPR0521RS_MODE_CONTROL,0);
}
#if UART_SHELL == 2
#include "nr_micro_shell.h"
void rpr0521rs_read(char argc, char *argv)
{
unsigned int ps;
float als;
printf("rpr0521rs:%d\r\n",RPR0521RS_Init());
RPR0521RS_get_psalsval(&ps, &als);
printf("ps=%u,\t als=%f.\r\n",ps,als);
}
NR_SHELL_CMD_EXPORT(rpr0521, rpr0521rs_read, "get light senser rpr0521rs data");
#endif
```
接着就是在hal_entry.c中添加初始化传感器和读取数值并在oled上显示。
!(https://www.eefocus.com/forum/data/attachment/forum/202608/09/154642qs5c21hczerpirym.png)
最终效果如下：
!(https://www.eefocus.com/forum/data/attachment/forum/202608/09/154700u00u8cij2kjapjas.png)
!(https://www.eefocus.com/forum/data/attachment/forum/202608/09/154709wxiugujyz85b5bbu.png)
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