69 lines
1.3 KiB
C
69 lines
1.3 KiB
C
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#include "../main/SystemInclude.h"
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// <20><>ȡ<EFBFBD><C8A1><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
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u16 AirflowSensor_Read(void)
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{
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u8 raw_data[2] = {0};
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SI2C_Start();
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// <20><><EFBFBD>Ͷ<EFBFBD>ȡ<EFBFBD><C8A1><EFBFBD><EFBFBD><EEA3A8>ַ + <20><>ģʽ<C4A3><CABD>
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SI2C_Write((HAF_ADR << 1) | 0x01);
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// <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ȡ2<C8A1>ֽ<EFBFBD><D6BD><EFBFBD><EFBFBD><EFBFBD>
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// <20><><EFBFBD>ݸ<EFBFBD>ʽ<EFBFBD><CABD>[<5B><><EFBFBD><EFBFBD><EFBFBD><EFBFBD>8λ, <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD>8λ]
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raw_data[0] = SI2C_Read();
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SI2C_Ack(); // <20><><EFBFBD><EFBFBD>ACK<43><4B><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ȡ
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raw_data[1] = SI2C_Read();
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SI2C_NoAck();// <20><><EFBFBD><EFBFBD>һ<EFBFBD><D2BB><EFBFBD>ֽڷ<D6BD><DAB7><EFBFBD>NACK
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SI2C_Stop();
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// <20>ϲ<EFBFBD><CFB2><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ݣ<EFBFBD>16λ<36><CEBB>
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u16 flow_raw =((raw_data[0] << 8) | raw_data[1]) ;
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return flow_raw ;
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}
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// <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ȡ<EFBFBD><C8A1><EFBFBD><EFBFBD>ȡƽ<C8A1><C6BD>ֵ
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u16 AirflowSensor_ReadAverage(u8 count)
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{
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u8 valid_count = 0;
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u32 total_flow = 0;
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if (count <= 0) return 0;
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for (uint8_t i = 0; i < count; i++)
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{
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total_flow += AirflowSensor_Read();
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valid_count++;
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delay_ms(10);
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}
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if (valid_count > 0) {
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total_flow= total_flow / valid_count;
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}
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return total_flow;
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}
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// ת<><D7AA><EFBFBD><EFBFBD>SCCM
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#define MaximumFlow 750 //SCCM
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float Get_AirflowSensor_SCCM(void)
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{
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u16 total_flow = 0;
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float slpm_flow;
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total_flow = AirflowSensor_ReadAverage(10);//<2F><>ȡ<EFBFBD><C8A1><EFBFBD><EFBFBD>ת<EFBFBD><D7AA>10<31>ε<EFBFBD>ƽ<EFBFBD><C6BD>ֵ
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if(total_flow > 8192)slpm_flow = (total_flow-8192)*MaximumFlow;
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else slpm_flow = (total_flow+8192)*MaximumFlow;
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slpm_flow = slpm_flow/ 8192;
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return slpm_flow;
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}
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