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Ïåðåêëàä

Ìîäóëü <BCM2835> ï³äñèñòåìè "Çá³ð äàíèõ"

Âñòóï

Ìîäóëü íàäຠäî ñèñòåìè OpenSCADA ï³äòðèìêó äæåðåë äàíèõ Âõîä³â/Âèõîä³â Çàãàëüíîãî Ïðèçíà÷åííÿ (GPIO) ïëàòè Raspberry PI, îñíîâàí³é íà ÷èï³ BCM2835. BCM2835 GPIO íà Raspberry Pi íàðàõîâóº äî 32 øòèð³â äåÿê³ ç ÿêèõ ìîæóòü çä³éñíþâàòè àëüòåðíàòèâí³ ôóíêö³¿ íà êøòàëò: I2C, UART, SPIO. Äëÿ äîñòóïó äî öüîãî GPIO ó çàãàëüíèõ ôóíêö³ÿõ âèêîðèñòàíî á³áë³îòåêó libBCM2835.

1. Îá'ºêò êîíòðîëåðó

GPIO ó OpenSCADA êîíô³ãóðóºòüñÿ øëÿõîì ñòâîðåííÿ íîâîãî îá'ºêòó êîíòðîëåðó (Ðèñ.1) òà îá'ºêòó ïàðàìåòðó êîíòðîëåðó — îäèí ïàðàìåòð GPIO ö³º¿ ïëàòè.

Ðèñ.1. Âêëàäêà êîíô³ãóðàö³¿ îá'ºêòó êîíòðîëåðó.

Çà ö³ºþ âêëàäêîþ Âè ìîæåòå âñòàíîâèòè:

• Ñòàí êîíòðîëåðà, à ñàìå: Ñòàòóñ "Âêëþ÷åíî", "Çàïóùåíî" òà ³ì'ÿ áàçè äàíèõ, ùî ì³ñòèòü öþ êîíô³ãóðàö³þ.
• ²äåíòèô³êàòîð, ³ì'ÿ òà îïèñ êîíòðîëåðó.
• Ñòàí, ó ÿêèé êîíòðîëåð ìຠáóòó ïåðåâåäåíî ïðè çàâàíòàæåí³: "Âêëþ÷àòè" òà "Çàïóñêàòè".
• ²ì'ÿ òàáëèö³ äëÿ çáåðåæåííÿ ïàðàìåòð³â êîíòðîëåðó.

Ïåðåêëàä

2. Îá'ºêò ïàðàìåòðó êîíòðîëåðó

Îá'ºêò ïàðàìåòðó áåçïîñåðåäíüî ïðåçåíòóº-â³äîáðàæຠGPIO, ÿêèé ì³ñòèòü ïåðåë³ê àòðèáóò³â ëîã³÷íîãî òèïó ó çàãàëüíî¿ ê³ëüêîñò³ 32. Parameter's object configuration tab is shown in Figure 2. The acquisition data is done only in synchronous mode but GPIO must be fast.

Fig.2. Parameter's object configuration tab.

With the parameter's object configuration tab you can set:

• The state of the parameter: type, "Enable" and static functions list.
• Id, name and description of the parameter.
• The state, in which the parameter must be translated at boot: "To enable".

Tab "Attributes" for the GPIO is shown in Figure 3. For the GPIO there is accessed also "Configuration" tab (Fig.4) with IO mode and reverse state.

Fig.3. Tab "Attributes" of the parameter object.

Fig.4. Tab "Configuration" of the parameter object.

For maximum fast access to the GPIO the parameter object provides three static functions: "mode", "get" and "put". These functions can be used in an user programming area of OpenSCADA system for the organization of not ordinary interaction algorithms. To address the functions you can use static call address BCM2835.{cntr}.{prm}.{Func}() or dynamic SYS.DAQ.BCM2835.{cntr}.{prm}["{Func}"].call(). Where:

• {cntr} — identifier of the controller's object;
• {prm} — identifier of the parameter's object;
• {Func} — identifier of the function.

2.1. Function GPIO: Mode (mode)

Description: GPIO mode, input or output.
Parameters:

2.2. Function GPIO: Get (get)

Description: GPIO get pin level.
Parameters:

2.3. Function GPIO: Put (put)

Description: GPIO put pin level.
Parameters:

3. Notes

The module tested on boards Raspberry Pi 2, 3 model B. For details you can see to the page and the task.

Access to the static functions was measured for the different methods which you can see here.

For derivative DAQ templates creation using the static functions you can use also dynamic linking to its, like this:
function put = addr+".fnc_put"; if(put) { put(D4, vl&0x10); put(D5, vl&0x20); put(D6, vl&0x40); put(D7, vl&0x80); }

In this configurable way for now have implemented next templates of the low-level devices:

• GPIO: DHT11,22 (AM23XX)
• GPIO: 1602A(HD44780) (1602A)

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