void uart_poweroff(uart_t uart)
{
PM->APBCMASK.reg &= ~(PM_APBCMASK_SERCOM0 << _sercom_id(_uart(uart)));
GCLK->CLKCTRL.reg = ((SERCOM0_GCLK_ID_CORE + _sercom_id(_uart(uart))) <<
GCLK_CLKCTRL_ID_Pos);
while (GCLK->STATUS.reg & GCLK_STATUS_SYNCBUSY) {}
}
void uart_poweron(uart_t uart)
{
PM->APBCMASK.reg |= (PM_APBCMASK_SERCOM0 << _sercom_id(_uart(uart)));
GCLK->CLKCTRL.reg = (GCLK_CLKCTRL_CLKEN |
GCLK_CLKCTRL_GEN_GCLK0 |
(SERCOM0_GCLK_ID_CORE + _sercom_id(_uart(uart))) <<
GCLK_CLKCTRL_ID_Pos);
while (GCLK->STATUS.reg & GCLK_STATUS_SYNCBUSY);
}
int uart_init(uart_t uart, uint32_t baudrate, uart_rx_cb_t rx_cb, void *arg)
{
/* initialize basic functionality */
int res = init_base(uart, baudrate);
if (res != 0) {
return res;
}
/* register callbacks */
uart_ctx[uart].rx_cb = rx_cb;
uart_ctx[uart].arg = arg;
/* configure interrupts and enable RX interrupt */
_uart(uart)->INTENSET.reg = SERCOM_USART_INTENSET_RXC;
NVIC_EnableIRQ(SERCOM0_IRQn + _sercom_id(_uart(uart)));
return 0;
}