void
usbserial_init(void)
{
// configure usb clock
enable_pclock(USB_GCLK_ID, 0);
// configure USBD+ and USBD- pins
gpio_peripheral('A', 24, 'G', 0);
gpio_peripheral('A', 25, 'G', 0);
uint16_t trim = (readl((void*)USB_FUSES_TRIM_ADDR)
& USB_FUSES_TRIM_Msk) >> USB_FUSES_TRIM_Pos;
uint16_t transp = (readl((void*)USB_FUSES_TRANSP_ADDR)
& USB_FUSES_TRANSP_Msk) >> USB_FUSES_TRANSP_Pos;
uint16_t transn = (readl((void*)USB_FUSES_TRANSN_ADDR)
& USB_FUSES_TRANSN_Msk) >> USB_FUSES_TRANSN_Pos;
USB->DEVICE.PADCAL.reg = (USB_PADCAL_TRIM(trim) | USB_PADCAL_TRANSP(transp)
| USB_PADCAL_TRANSN(transn));
// Enable USB in device mode
USB->DEVICE.CTRLA.reg = USB_CTRLA_ENABLE;
USB->DEVICE.DESCADD.reg = (uint32_t)usb_desc;
EP0.EPCFG.reg = USB_DEVICE_EPCFG_EPTYPE0(1) | USB_DEVICE_EPCFG_EPTYPE1(1);
EP_ACM.EPCFG.reg = USB_DEVICE_EPCFG_EPTYPE1(4);
USB->DEVICE.CTRLB.reg = 0;
// enable irqs
USB->DEVICE.INTENSET.reg = USB_DEVICE_INTENSET_EORST;
NVIC_SetPriority(USB_IRQn, 1);
NVIC_EnableIRQ(USB_IRQn);
}
struct gpio_adc
gpio_adc_setup(uint8_t pin)
{
// Find pin in adc_pins table
int chan;
for (chan=0; ; chan++) {
if (chan >= ARRAY_SIZE(adc_pins))
shutdown("Not a valid ADC pin");
if (adc_pins[chan] == pin)
break;
}
if (!is_enabled_pclock(PCLK_ADC)) {
// Power up ADC
enable_pclock(PCLK_ADC);
uint32_t prescal = DIV_ROUND_UP(CONFIG_CLOCK_FREQ*4, ADC_FREQ_MAX) - 1;
LPC_ADC->ADCR = adc_status.adcr = (1<<21) | ((prescal & 0xff) << 8);
LPC_ADC->ADINTEN = 0xff;
adc_status.chan = ADC_DONE;
NVIC_SetPriority(ADC_IRQn, 0);
NVIC_EnableIRQ(ADC_IRQn);
}
gpio_peripheral(pin, adc_pin_funcs[chan], 0);
return (struct gpio_adc){ .chan = chan };
}
