/**
* pinModeIRQ
*
* pin - arduino pin
* mode - one of the modes defined for arudino IRQs LOW , CHANGE, RISING, FALLING, HIGH
*/
int pinModeIRQ(uint8_t pin, int8_t mode)
{
int ret = 0;
uint32_t gpio = 0;
ret = variantPinModeIRQ(pin, mode);
if (ret) {
trace_error("%s: variantPinMode failed\n", __func__);
return ret;
}
gpio = pin2gpio(pin);
if (gpio == PIN_EINVAL){
trace_error("%s: pin %d out of range (gpio%d)", __func__, pin, gpio);
return gpio;
}
ret = muxSelectDigitalPin(pin);
if (ret) {
trace_error("%s: can't set mux for pin%d\n", __func__, pin);
return ret;
}
trace_debug("%s: pin=%d, gpio=%d, mode=%d", __func__, pin, gpio, mode);
// Now set the mode for IRQ granularity
switch (mode) {
case NONE:
case CHANGE:
case RISING:
case FALLING:
ret = sysfsGpioEdgeConfig(gpio, mode);
break;
case LOW:
case HIGH:
// Implies edge config none
ret = sysfsGpioEdgeConfig(gpio, NONE);
if ( ret < 0 )
break;
// Set to active high or active low
ret = sysfsGpioLevelConfig(gpio, mode);
break;
default:
ret = PIN_EINVAL;
break;
}
return ret;
}
void SPIClass::begin()
{
/* Set the pin mux, for the SCK, MOSI and MISO pins ONLY
*
* Leave the SS pin in GPIO mode (the application will control it)
* but set it's direction to output and initially high
*/
muxSelectDigitalPin(SPI_SS_GPIO_PIN);
pinMode(SPI_SS_GPIO_PIN, OUTPUT);
digitalWrite(SPI_SS_GPIO_PIN, HIGH);
muxSelectSpi(1);
this->fd = open(LINUX_SPIDEV, O_RDWR);
if (this->fd < 0) {
trace_error("Failed to open SPI device\n");
return;
}
/* Load default/last configuration */
this->setBitOrder(this->bitOrder);
this->setClockDivider(this->clkDiv);
this->setDataMode(this->mode);
}
