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// sam3x8e serial port
//
// Copyright (C) 2016-2018 Kevin O'Connor <kevin@koconnor.net>
//
// This file may be distributed under the terms of the GNU GPLv3 license.
#include "autoconf.h" // CONFIG_SERIAL_BAUD
#include "board/serial_irq.h" // serial_rx_data
#include "internal.h" // gpio_peripheral
#include "sam3x8e.h" // UART
#include "sched.h" // DECL_INIT
void
serial_init(void)
{
gpio_peripheral(GPIO('A', 8), 'A', 1);
gpio_peripheral(GPIO('A', 9), 'A', 0);
// Reset uart
PMC->PMC_PCER0 = 1 << ID_UART;
UART->UART_PTCR = UART_PTCR_RXTDIS | UART_PTCR_TXTDIS;
UART->UART_CR = UART_CR_RSTRX | UART_CR_RSTTX | UART_CR_RXDIS | UART_CR_TXDIS;
UART->UART_IDR = 0xFFFFFFFF;
// Enable uart
UART->UART_MR = (US_MR_CHRL_8_BIT | US_MR_NBSTOP_1_BIT | UART_MR_PAR_NO
| UART_MR_CHMODE_NORMAL);
UART->UART_BRGR = SystemCoreClock / (16 * CONFIG_SERIAL_BAUD);
UART->UART_IER = UART_IER_RXRDY;
NVIC_EnableIRQ(UART_IRQn);
NVIC_SetPriority(UART_IRQn, 0);
UART->UART_CR = UART_CR_RXEN | UART_CR_TXEN;
}
DECL_INIT(serial_init);
void __visible
UART_Handler(void)
{
uint32_t status = UART->UART_SR;
if (status & UART_SR_RXRDY)
serial_rx_byte(UART->UART_RHR);
if (status & UART_SR_TXRDY) {
uint8_t data;
int ret = serial_get_tx_byte(&data);
if (ret)
UART->UART_IDR = UART_IDR_TXRDY;
else
UART->UART_THR = data;
}
}
void
serial_enable_tx_irq(void)
{
UART->UART_IER = UART_IDR_TXRDY;
}
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