Jimmy Hack
A wrapper library for easy access to DACs using the SPI interface. Individual devices will receive their own libraries.
Dependents: MAX500 MCP4922 MCP4822
DAC_SPI.cpp@1:679fa19d91b2, 2013-07-16 (annotated)
- Committer:
- JimmyTheHack
- Date:
- Tue Jul 16 05:52:01 2013 +0000
- Revision:
- 1:679fa19d91b2
attempted to merge with DAC_SPI
Who changed what in which revision?
| User | Revision | Line number | New contents of line |
|---|---|---|---|
| JimmyTheHack | 1:679fa19d91b2 | 1 | #ifndef DAC_SPI_CPP |
| JimmyTheHack | 1:679fa19d91b2 | 2 | #define DAC_SPI_CPP |
| JimmyTheHack | 1:679fa19d91b2 | 3 | |
| JimmyTheHack | 1:679fa19d91b2 | 4 | #include "DAC_SPI.h" |
| JimmyTheHack | 1:679fa19d91b2 | 5 | /*SPI Channels */ |
| JimmyTheHack | 1:679fa19d91b2 | 6 | //since we only have two SPI channels, which must be shared, define them here. |
| JimmyTheHack | 1:679fa19d91b2 | 7 | SPI SPI_A(p5, NC, p7); //If using with other serial devices, can pass a pointer to the serial channel. |
| JimmyTheHack | 1:679fa19d91b2 | 8 | SPI SPI_B(p11, NC, p13); |
| JimmyTheHack | 1:679fa19d91b2 | 9 | |
| JimmyTheHack | 1:679fa19d91b2 | 10 | /*Initialize DAC */ |
| JimmyTheHack | 1:679fa19d91b2 | 11 | DAC_SPI::DAC_SPI(int SPIchannelNum, PinName _CS, PinName _LDAC) : CS(_CS), LDAC(_LDAC){ |
| JimmyTheHack | 1:679fa19d91b2 | 12 | if (SPIchannelNum ==1){ |
| JimmyTheHack | 1:679fa19d91b2 | 13 | DACspi = &SPI_B; |
| JimmyTheHack | 1:679fa19d91b2 | 14 | } |
| JimmyTheHack | 1:679fa19d91b2 | 15 | else{ |
| JimmyTheHack | 1:679fa19d91b2 | 16 | DACspi = &SPI_A; |
| JimmyTheHack | 1:679fa19d91b2 | 17 | } |
| JimmyTheHack | 1:679fa19d91b2 | 18 | messageBits(16); |
| JimmyTheHack | 1:679fa19d91b2 | 19 | } |
| JimmyTheHack | 1:679fa19d91b2 | 20 | |
| JimmyTheHack | 1:679fa19d91b2 | 21 | /** Manually change the SPI frequency |
| JimmyTheHack | 1:679fa19d91b2 | 22 | * Must be a value supported by the mbed and DAC |
| JimmyTheHack | 1:679fa19d91b2 | 23 | */ |
| JimmyTheHack | 1:679fa19d91b2 | 24 | void DAC_SPI::frequency(int freq){ |
| JimmyTheHack | 1:679fa19d91b2 | 25 | (*DACspi).frequency(freq); |
| JimmyTheHack | 1:679fa19d91b2 | 26 | } |
| JimmyTheHack | 1:679fa19d91b2 | 27 | |
| JimmyTheHack | 1:679fa19d91b2 | 28 | |
| JimmyTheHack | 1:679fa19d91b2 | 29 | //specify the number of bits used in message packets to the DAC. |
| JimmyTheHack | 1:679fa19d91b2 | 30 | void DAC_SPI::messageBits(int bits){ |
| JimmyTheHack | 1:679fa19d91b2 | 31 | (*DACspi).format(bits,0); |
| JimmyTheHack | 1:679fa19d91b2 | 32 | } |
| JimmyTheHack | 1:679fa19d91b2 | 33 | |
| JimmyTheHack | 1:679fa19d91b2 | 34 | //select a DACnum for use with chips with multiple onboard DACs. |
| JimmyTheHack | 1:679fa19d91b2 | 35 | void DAC_SPI::select(char DACnum){ |
| JimmyTheHack | 1:679fa19d91b2 | 36 | DACselect=DACnum; |
| JimmyTheHack | 1:679fa19d91b2 | 37 | } |
| JimmyTheHack | 1:679fa19d91b2 | 38 | |
| JimmyTheHack | 1:679fa19d91b2 | 39 | #endif //DAC_SPI_CPP |