mirror of https://github.com/rusefi/rusefi.git
69 lines
1.5 KiB
C++
69 lines
1.5 KiB
C++
#include "pch.h"
|
|
|
|
#include "ads1015.h"
|
|
|
|
constexpr uint8_t addr = 0x48;
|
|
|
|
#define ADS1015_CONV (0)
|
|
#define ADS1015_CONFIG (1)
|
|
#define ADS1015_LO_THRESH (2)
|
|
#define ADS1015_HI_THRESH (3)
|
|
|
|
bool Ads1015::init(brain_pin_e scl, brain_pin_e sda) {
|
|
if (!m_i2c.init(scl, sda)) {
|
|
return false;
|
|
}
|
|
|
|
// ADS1015 has no ID register - so we read the Lo_thresh instead
|
|
uint16_t loThresh = readReg(ADS1015_LO_THRESH);
|
|
|
|
if (loThresh != 0x8000) {
|
|
return false;
|
|
}
|
|
|
|
m_hasInit = true;
|
|
return true;
|
|
}
|
|
|
|
void Ads1015::readChannels(float (&result)[4]) {
|
|
for (size_t i = 0; i < 4; i++) {
|
|
result[i] = readChannel(i);
|
|
}
|
|
}
|
|
|
|
float Ads1015::readChannel(uint8_t channel) {
|
|
// set the channel
|
|
// set to +-6.144v full scale, fastest sampling, manual conversion start
|
|
writeReg(ADS1015_CONFIG, 0xC1E0 | channel << 12);
|
|
|
|
// Wait for conversion to complete
|
|
// Bit is cleared while conversion is ongoing, set when done
|
|
while ((readReg(ADS1015_CONFIG) & 0x8000) == 0) ;
|
|
|
|
// Read the result
|
|
int16_t result = readReg(ADS1015_CONV);
|
|
// Result is 12 bits left aligned, so right align the result
|
|
result = result >> 4;
|
|
|
|
// 2048 counts = positive 6.144 volts
|
|
constexpr float ratio = 6.144f / 2048;
|
|
return result * ratio;
|
|
}
|
|
|
|
void Ads1015::writeReg(uint8_t reg, uint16_t data) {
|
|
uint8_t packet[3];
|
|
|
|
packet[0] = reg;
|
|
packet[1] = data >> 8;
|
|
packet[2] = data & 0xFF;
|
|
|
|
m_i2c.write(addr, packet, 3);
|
|
}
|
|
|
|
uint16_t Ads1015::readReg(uint8_t reg) {
|
|
uint16_t res;
|
|
m_i2c.write(addr, ®, 1);
|
|
m_i2c.read(addr, reinterpret_cast<uint8_t*>(&res), 2);
|
|
return SWAP_UINT16(res);
|
|
}
|