static void hmc5883lConfigureDataReadyInterruptHandling(void)
{
#ifdef USE_MAG_DATA_READY_SIGNAL
if (!(hmc5883Config->intTag)) {
return;
}
intIO = IOGetByTag(hmc5883Config->intTag);
#ifdef ENSURE_MAG_DATA_READY_IS_HIGH
uint8_t status = IORead(intIO);
if (!status) {
return;
}
#endif
EXTIHandlerInit(&hmc5883_extiCallbackRec, hmc5883_extiHandler);
EXTIConfig(intIO, &hmc5883_extiCallbackRec, NVIC_PRIO_MAG_INT_EXTI, EXTI_Trigger_Rising);
EXTIEnable(intIO, true);
#endif
}
bool hcsr04Detect(rangefinderDev_t *dev, const sonarConfig_t * rangefinderHardwarePins)
{
bool detected = false;
#ifdef STM32F10X
// enable AFIO for EXTI support
RCC_ClockCmd(RCC_APB2(AFIO), ENABLE);
#endif
#if defined(STM32F3) || defined(STM32F4)
RCC_ClockCmd(RCC_APB2(SYSCFG), ENABLE); // XXX Do we need this?
#endif
triggerIO = IOGetByTag(rangefinderHardwarePins->triggerTag);
echoIO = IOGetByTag(rangefinderHardwarePins->echoTag);
if (IOGetOwner(triggerIO) != OWNER_FREE) {
return false;
}
if (IOGetOwner(echoIO) != OWNER_FREE) {
return false;
}
// trigger pin
IOInit(triggerIO, OWNER_SONAR_TRIGGER, 0);
IOConfigGPIO(triggerIO, IOCFG_OUT_PP);
IOLo(triggerIO);
delay(100);
// echo pin
IOInit(echoIO, OWNER_SONAR_ECHO, 0);
IOConfigGPIO(echoIO, IOCFG_IN_FLOATING);
// HC-SR04 echo line should be low by default and should return a response pulse when triggered
if (IORead(echoIO) == false) {
for (int i = 0; i < 5 && !detected; i++) {
timeMs_t requestTime = millis();
hcsr04_start_reading();
while ((millis() - requestTime) < HCSR04_MinimumFiringIntervalMs) {
if (IORead(echoIO) == true) {
detected = true;
break;
}
}
}
}
if (detected) {
// Hardware detected - configure the driver
#ifdef USE_EXTI
EXTIHandlerInit(&hcsr04_extiCallbackRec, hcsr04_extiHandler);
EXTIConfig(echoIO, &hcsr04_extiCallbackRec, NVIC_PRIO_SONAR_EXTI, EXTI_Trigger_Rising_Falling); // TODO - priority!
EXTIEnable(echoIO, true);
#endif
dev->delayMs = 100;
dev->maxRangeCm = HCSR04_MAX_RANGE_CM;
dev->detectionConeDeciDegrees = HCSR04_DETECTION_CONE_DECIDEGREES;
dev->detectionConeExtendedDeciDegrees = HCSR04_DETECTION_CONE_EXTENDED_DECIDEGREES;
dev->init = &hcsr04_init;
dev->update = &hcsr04_update;
dev->read = &hcsr04_get_distance;
return true;
}
else {
// Not detected - free resources
IORelease(triggerIO);
IORelease(echoIO);
return false;
}
}
void hmc5883lInit(void)
{
int16_t magADC[3];
int i;
int32_t xyz_total[3] = { 0, 0, 0 }; // 32 bit totals so they won't overflow.
bool bret = true; // Error indicator
#ifdef USE_MAG_DATA_READY_SIGNAL
if (hmc5883Config && hmc5883Config->io) {
intIO = IOGetByTag(hmc5883Config->io);
IOInit(intIO, OWNER_SYSTEM, RESOURCE_INPUT | RESOURCE_EXTI);
IOConfigGPIO(intIO, IOCFG_IN_FLOATING);
}
#endif
delay(50);
i2cWrite(HMC5883L_I2C_INSTANCE, MAG_ADDRESS, HMC58X3_R_CONFA, 0x010 + HMC_POS_BIAS); // Reg A DOR = 0x010 + MS1, MS0 set to pos bias
// Note that the very first measurement after a gain change maintains the same gain as the previous setting.
// The new gain setting is effective from the second measurement and on.
i2cWrite(HMC5883L_I2C_INSTANCE, MAG_ADDRESS, HMC58X3_R_CONFB, 0x60); // Set the Gain to 2.5Ga (7:5->011)
delay(100);
hmc5883lRead(magADC);
for (i = 0; i < 10; i++) { // Collect 10 samples
i2cWrite(HMC5883L_I2C_INSTANCE, MAG_ADDRESS, HMC58X3_R_MODE, 1);
delay(50);
hmc5883lRead(magADC); // Get the raw values in case the scales have already been changed.
// Since the measurements are noisy, they should be averaged rather than taking the max.
xyz_total[X] += magADC[X];
xyz_total[Y] += magADC[Y];
xyz_total[Z] += magADC[Z];
// Detect saturation.
if (-4096 >= MIN(magADC[X], MIN(magADC[Y], magADC[Z]))) {
bret = false;
break; // Breaks out of the for loop. No sense in continuing if we saturated.
}
LED1_TOGGLE;
}
// Apply the negative bias. (Same gain)
i2cWrite(HMC5883L_I2C_INSTANCE, MAG_ADDRESS, HMC58X3_R_CONFA, 0x010 + HMC_NEG_BIAS); // Reg A DOR = 0x010 + MS1, MS0 set to negative bias.
for (i = 0; i < 10; i++) {
i2cWrite(HMC5883L_I2C_INSTANCE, MAG_ADDRESS, HMC58X3_R_MODE, 1);
delay(50);
hmc5883lRead(magADC); // Get the raw values in case the scales have already been changed.
// Since the measurements are noisy, they should be averaged.
xyz_total[X] -= magADC[X];
xyz_total[Y] -= magADC[Y];
xyz_total[Z] -= magADC[Z];
// Detect saturation.
if (-4096 >= MIN(magADC[X], MIN(magADC[Y], magADC[Z]))) {
bret = false;
break; // Breaks out of the for loop. No sense in continuing if we saturated.
}
LED1_TOGGLE;
}
magGain[X] = fabsf(660.0f * HMC58X3_X_SELF_TEST_GAUSS * 2.0f * 10.0f / xyz_total[X]);
magGain[Y] = fabsf(660.0f * HMC58X3_Y_SELF_TEST_GAUSS * 2.0f * 10.0f / xyz_total[Y]);
magGain[Z] = fabsf(660.0f * HMC58X3_Z_SELF_TEST_GAUSS * 2.0f * 10.0f / xyz_total[Z]);
// leave test mode
i2cWrite(HMC5883L_I2C_INSTANCE, MAG_ADDRESS, HMC58X3_R_CONFA, 0x70); // Configuration Register A -- 0 11 100 00 num samples: 8 ; output rate: 15Hz ; normal measurement mode
i2cWrite(HMC5883L_I2C_INSTANCE, MAG_ADDRESS, HMC58X3_R_CONFB, 0x20); // Configuration Register B -- 001 00000 configuration gain 1.3Ga
i2cWrite(HMC5883L_I2C_INSTANCE, MAG_ADDRESS, HMC58X3_R_MODE, 0x00); // Mode register -- 000000 00 continuous Conversion Mode
delay(100);
if (!bret) { // Something went wrong so get a best guess
magGain[X] = 1.0f;
magGain[Y] = 1.0f;
magGain[Z] = 1.0f;
}
#ifdef USE_MAG_DATA_READY_SIGNAL
do {
if (!(hmc5883Config && intIO))
break;
# ifdef ENSURE_MAG_DATA_READY_IS_HIGH
if (!IORead(intIO))
break;
# endif
EXTIHandlerInit(&hmc5883_extiCallbackRec, hmc5883_extiHandler);
EXTIConfig(intIO, &hmc5883_extiCallbackRec, NVIC_PRIO_MAG_INT_EXTI, EXTI_Trigger_Rising);
EXTIEnable(intIO, true);
} while (0);
#endif
}
