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AN2961 参数 Datasheet PDF下载

AN2961图片预览
型号: AN2961
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文件页数/大小: 50 页 / 706 K
品牌: FREESCALE [ Freescale ]
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Status Word  
Table 2. Driver Services (continued)  
Function  
Driver  
Echo_EnableRSSI  
Enables the RSSI module and read RSSI on incoming messages  
automatically.  
Echo_DisableRSSI  
Echo_SetRxSensitivity  
Echo_SetTxPower  
Echo_RagcHigh  
Disables the RSSI module.  
Sets receive sensitivity: 1 [sensitive] – 4 [less sensitive].  
Sets output power: 1 [high power] – 4 [low power].  
Resets the automatic gain control to maximum level.  
Allows automatic gain control to take place.  
Freezes the automatic gain control level.  
Echo_RagcLow  
Echo_FagcHigh  
Echo_FagcLow  
Unfreezes the automatic gain control level.  
Reads or writes directly to Echos internal registers.  
Changes active bank of Echos registers.  
Echo_ChangeConfig  
Echo_ChangeBank  
Table 3. Driver Storage  
Driver  
Function  
unsigned char  
Buffer that the application must fill with transmit settings and data.  
echoTransmitBuffer[ECHO_MAX_ For buffer format, see Section 9.5, “Buffer Formats.”  
DATA_SIZE+4]  
unsigned char *echoNextMessage Pointer to the next received message; updates after  
Echo_DriverStatus()  
8
Status Word  
The status word returned by Echo_DriverStatus()is a 16-bit unsigned int. Figure 5 shows the format of  
the word.  
Bit  
15  
14  
13  
12  
11  
10  
9
8
Name  
SwitchMode  
Timeout  
LVD  
Error  
RSSI_InPRO RSSI_Enable ModeSwitchD EnableDelay  
GRESS  
d
elay  
Bit  
7
6
5
4
3
2
1
0
Name  
Mode  
Overrun  
Checksum  
Rx  
Tx  
MSGReady  
Busy  
Enabled  
Figure 5. Status Word Bit Allocation  
The function of each bit is described in Table 4. Multiple bits may be set at any one time to reflect the state  
of the device driver at that time.  
Software Drivers for MC33696, Rev. 1  
10  
Freescale Semiconductor