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#include "bsp_amg88xx.h"
#include "bsp_iic.h"
u8 xx;
void amg88xx_init(void)
{
i2c_init();
amg88xx_write(AMG88xx_PCTL, AMG88xx_NORMAL_MODE);
amg88xx_write(AMG88xx_RST, AMG88xx_INITIAL_RESET);
amg88xx_write(AMG88xx_FPSC, AMG88xx_FPS_10);
}
uint8_t amg88xx_write(uint8_t reg,uint8_t data)
{
i2c_Start();
i2c_SendByte((AMG88xx_ADDRESS<<1)|0); //發送器件地址+寫命令
if(i2c_WaitAck()) //等待應答
{
i2c_Stop();
return 1;
}
i2c_SendByte(reg); //寫寄存器地址
i2c_WaitAck(); //等待應答
i2c_SendByte(data); //發送數據
if(i2c_WaitAck()) //等待ACK
{
i2c_Stop();
return 1;
}
i2c_Stop();
return 0;
}
uint8_t amg88xx_read_len(uint8_t reg,uint8_t len,uint8_t *buf)
{
i2c_Start();
i2c_SendByte((AMG88xx_ADDRESS<<1)|0); //發送器件地址+寫命令
if(i2c_WaitAck()) //等待應答
{
i2c_Stop();
return 1;
}
i2c_SendByte(reg); //寫寄存器地址
i2c_WaitAck(); //等待應答
i2c_Start();
i2c_SendByte((AMG88xx_ADDRESS<<1)|1); //發送器件地址+讀命令
i2c_WaitAck(); //等待應答
while(len)
{
if(len==1)
{
*buf=i2c_ReadByte();//讀數據,發送nACK
i2c_NAck();
}
else
{
*buf=i2c_ReadByte(); //讀數據,發送ACK
i2c_Ack();
}
len--;
buf++;
}
i2c_Stop(); //產生一個停止條件
return 0;
}
float AMG88XX_signedMag12ToFloat(uint16_t val)
{
//take first 11 bits as absolute val
uint16_t absVal = (val & 0x7FF);
return (val & 0x8000) ? 0 - (float)absVal : (float)absVal ;
}
float amg88xx_readThermistor()
{
uint8_t raw[2];
uint16_t recast;
amg88xx_read_len(AMG88xx_TTHL, 2, raw);
recast = ((uint16_t)raw[1] << 8) | ((uint16_t)raw[0]);
return AMG88XX_signedMag12ToFloat(recast) * AMG88xx_THERMISTOR_CONVERSION;
}
void amg88xx_readPixels(float *buf, uint8_t size)
{
uint16_t recast;
float converted;
uint8_t rawArray[128];
amg88xx_read_len(AMG88xx_PIXEL_OFFSET, 128, rawArray);
for(int i=0; i<size; i++)
{
uint8_t pos = i << 1;
recast = ((uint16_t)rawArray[pos + 1] << 8) | ((uint16_t)rawArray[pos]);
converted = AMG88XX_signedMag12ToFloat(recast) * AMG88xx_PIXEL_TEMP_CONVERSION;
buf[i] = converted;
}
}

復制代碼

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