Created
June 9, 2014 17:48
-
-
Save tashwoods/bec8c031a0889f633cf1 to your computer and use it in GitHub Desktop.
VCO_static_voltage
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
#include "mbed.h" | |
SPI spi(p5, p6, p7); // mosi, miso, sclk | |
DigitalOut cs(p8); //SYNC* pin labeled as cs | |
DigitalOut LDAC(p9); //LDAC* pin | |
DigitalOut CLR(p10); //CLR* pin | |
DigitalOut Reset(p11); //Reset* pin | |
void write(char reg1, char reg2, char reg3); | |
void setup_DAC(); | |
int main() | |
{ | |
setup_DAC(); //intializes LPC1768 and AD5791 | |
while(1) | |
{ | |
write(0x1F, 0xDE, 0x80); //programs DAC to change to the voltage corresponding to 14, CC, CD | |
} | |
} | |
void write(char reg1, char reg2, char reg3) | |
{ | |
cs = 1; | |
LDAC = 1; | |
cs = 0; | |
spi.write(0x20); //Sets the control register | |
spi.write(0x00); //DACTRI, OPGND, SDOSIS, LINCOMP = 0 | |
spi.write(0x12); //RBUF, BIN/2sC = 1 | |
wait_us(1); | |
cs = 1; | |
wait_us(1); | |
LDAC = 0; | |
wait_us(1); | |
cs = 1; | |
LDAC = 1; | |
cs = 0; | |
spi.write(0x40); //Sets the control register | |
spi.write(0x00); //LDAC*, CLR*, RESET* = 0 | |
spi.write(0x00); //Still setting control register | |
wait_us(1); | |
cs = 1; | |
wait_us(1); | |
LDAC = 0; | |
wait_us(1); | |
cs = 1; | |
LDAC = 1; | |
cs = 0; | |
spi.write(reg1); //Sets the control register | |
spi.write(reg2); //LDAC*, CLR*, RESET* = 0 | |
spi.write(reg3); //Still setting control register | |
wait_us(1); | |
cs = 1; | |
wait_us(1); | |
LDAC = 0; | |
wait_us(1); | |
return; | |
} | |
void setup_DAC() | |
{ | |
//mbed_reset(); | |
spi.format(8,1); //set words sent to DAC to 8 bits, and sclk to mode 1 | |
spi.frequency(10000); //set sclk frequency | |
Reset = 0; | |
wait_us(1); | |
Reset = 1; | |
LDAC = 0; | |
CLR = 1; | |
return; | |
} |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment