53 lines
1.2 KiB
C++
53 lines
1.2 KiB
C++
#include <SPI.h>
|
|
#include "dagon.h"
|
|
|
|
static const uint32_t ctrlmsg = 0b10010 | (0b0010 << 20);
|
|
static const uint32_t readbit = 1 << 23;
|
|
static const int DACSS[DACS] = {4, 10, 12, 52};
|
|
|
|
uint32_t spi_write(uint32_t v, size_t dac) {
|
|
uint32_t r;
|
|
|
|
digitalWrite(DACSS[dac], LOW);
|
|
r = SPI.transfer(v >> 16 & 0xFF) << 16;
|
|
r |= SPI.transfer(v >> 8 & 0xFF) << 8;
|
|
r |= SPI.transfer(v & 0xFF);
|
|
digitalWrite(DACSS[dac], HIGH);
|
|
return v;
|
|
}
|
|
|
|
uint32_t spi_transfer(uint32_t v, size_t dac) {
|
|
spi_write(v, dac);
|
|
delayMicroseconds(1);
|
|
return spi_write(0, dac);
|
|
}
|
|
|
|
void spi_init() {
|
|
SPI.begin();
|
|
SPI.beginTransaction(SPISettings(1000000, MSBFIRST, SPI_MODE1));
|
|
|
|
for (size_t i = 0; i < DACS; i++) {
|
|
dg.conn[i] = false;
|
|
dg.ch[i].used = false;
|
|
dg.ch[i].volt = V0;
|
|
for (size_t attempts = 0; attempts < 5; attempts++) {
|
|
uint32_t c;
|
|
|
|
pinMode(DACSS[i], OUTPUT);
|
|
digitalWrite(DACSS[i], HIGH);
|
|
spi_write(ctrlmsg, i);
|
|
c = spi_transfer(ctrlmsg | readbit, i);
|
|
if (ctrlmsg & 0xFF == c & 0xFF) {
|
|
dg.conn[i] = true;
|
|
continue;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
void spi_reset() {
|
|
for (size_t i = 0; i < DACS; i++)
|
|
spi_write(i, 0b0100 | spi_register(0b0100));
|
|
spi_init();
|
|
}
|