Author | Peter Lankreijer |
Adapted-by | |
Compiler | 2.4o |
This library controls a MCP4922 via the SPI protocol.
delay.jal spi_master_sw.jal or spi_master_hw.jal http://ww1.microchip.com/downloads/en/DeviceDoc/22250A.pdf
The following should be defined in the main program: setup SPI for software SPI or none for hardware SPI include spi_master_sw define directions spi_master_sw_init(SPI_MODE_11) alias spi_master is spi_master_sw alias spi_master_exchange is spi_master_sw_exchange
var bit mcp4922_shdn at mcp4922_write[1] : 4
var bit _mcp4922_buf
var bit _mcp4922_ga
var bit _mcp4922_shdn
var bit mcp4922_ga at mcp4922_write[1] : 5
var byte mcp4922_write[2]
var bit mcp4922_buf at mcp4922_write[1] : 6
var bit mcp4922_ab at mcp4922_write[1] : 7
mcp4922_dac_ab(word in A, word in B)
mcp4922_dac(bit in register, word in X)
mcp4922_init(bit in buffer, bit in gain)
mcp4922_split_word(word in word_in, byte out high_byte, byte out low_byte)
mcp4922_dac_a(word in A)
mcp4922_dac_b(word in B)
var bit mcp4922_shdn at mcp4922_write[1] : 4
Output shutdown control bit
var bit _mcp4922_buf
No documentation found
var bit _mcp4922_ga
No documentation found
var bit _mcp4922_shdn
No documentation found
var bit mcp4922_ga at mcp4922_write[1] : 5
Output gain selection bit
var byte mcp4922_write[2]
Define variables
var bit mcp4922_buf at mcp4922_write[1] : 6
No documentation found
var bit mcp4922_ab at mcp4922_write[1] : 7
select DAC_A OR DAC_B
mcp4922_dac_ab(word in A, word in B)
Function to write to the DAC and update both registers at the same time
mcp4922_dac(bit in register, word in X)
Internal procedure to wite to the register
mcp4922_init(bit in buffer, bit in gain)
Initialise the MCP4922
mcp4922_split_word(word in word_in, byte out high_byte, byte out low_byte)
Internal used function to split a word into two bytes
mcp4922_dac_a(word in A)
Function to write to the DAC A and latch
mcp4922_dac_b(word in B)
Function to write to the DAC B and latch
18f27j53 | 18f27j53_mcp4922.jal |