參數(shù)資料
型號(hào)： ADM00310
廠商： Microchip Technology
文件頁數(shù)： 14/44頁
文件大?。?/td> 0K
描述： BOARD EVAL FOR MCP3903 AFE
產(chǎn)品培訓(xùn)模塊： MCP3903 6-Channel Energy Measurement Analog Front End
設(shè)計(jì)資源： MCP3903 Eval Brd BOM
MCP3903 Eval Brd Schematic
標(biāo)準(zhǔn)包裝： 1
主要目的： 接口，模擬前端（AFE）
嵌入式： 是，MCU，16 位
已用 IC / 零件： MCP3903，PIC24F，PIC24H，dsPIC33，MCP2200
已供物品： 板，2 個(gè)模塊，線纜，CD，電源
2011 Microchip Technology Inc.
DS22228B-page 21
MCP2200
2.3.1.21
ReadPortValue
Function:
int SimpleIOClass::ReadPortValue()
EXAMPLE 2-21:
2.3.1.22
SelectDevice
Function:
int SimpleIOClass::SelectDevice(unsigned int uiDeviceNo)
EXAMPLE 2-22:
Summary:
Reads the GPIO port as digital input.
Description:
Reads the GPIO port and returns the value of the port. This provides a method to read all pins
simultaneously, instead of one-by-one. In case of an error, the returned value will be 0x8000.
Precondition:
Must be previously configured as an input via a ConfigureIO call.
VID and PID must be previously set via a call to InitMCP2200(VID, PID).
Parameters:
None.
Returns:
This function returns True if the transmission is successful and returns False if the transmission fails.
Remarks:
Pins configured for output return the current state of the port. Pins configured as input read as zero.
Summary:
Selects one of the active devices in the system.
Description:
The function is used to select one of the detected devices in the system as the “active device”.
Precondition:
At least one call to the InitMCP2200() is required in order to initiate a DLL search for the compatible
devices. Also, in order to know the actual number of devices in the system, call the
SimpleIOClass::IsConnected()
function. VID and PID must be previously set via a call to
InitMCP2200(VID, PID)
.
Parameters:
uiDeviceNo
- the ID of the device to be selected (can have a value between 0 and the number of
devices minus 1).
Returns:
This function returns ‘0’ in case of selection success, otherwise it will return:
E_WRONG_DEVICE_ID (-1) for a device ID that is out of range
E_INACTIVE_DEVICE (-2) for an inactive device.
Remarks:
Call the SimpleIOClass::IsConnected() prior to the call of this function in order to have the most
recent number of devices that are present in the system.
int rv;
rv = SimpleIOClass::ReadPortValue()
if (rv != 0x8000)
{
lblStatusBar->Text = “Success”;
}
else
lblStatusBar->Text = “Invalid command ” +
SimpleIOClass::LastError;
int iResult;
iResult = SimpleIOClass::SelectDevice(1)
if (iResult == 0)
{
lblStatusBar->Text = “Success”;
}
else
lblStatusBar->Text = “Error selecting device”;
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