參數(shù)資料
型號(hào)： MCP2200-I/SS
廠商： Microchip Technology
文件頁(yè)數(shù)： 14/44頁(yè)
文件大小： 0K
描述： IC USB TO UART 20SSOP
特色產(chǎn)品： MCP2200 USB-to-UART Serial Converter
標(biāo)準(zhǔn)包裝： 67
特點(diǎn)： USB 至 UART
通道數(shù)： 8
FIFO's： 256 字節(jié)
規(guī)程： USB 2.0
電源電壓： 3 V ~ 5.5 V
帶自動(dòng)流量控制功能： 是
安裝類型： 表面貼裝
封裝/外殼： 20-SSOP（0.209"，5.30mm 寬）
供應(yīng)商設(shè)備封裝： 20-SSOP
包裝： 管件
產(chǎn)品目錄頁(yè)面： 684 (CN2011-ZH PDF)
工具箱： AC160135-1-KIT-ND - KIT
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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