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/*
* Copyright (c) 2015 Eric Holland
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files
* (the "Software"), to deal in the Software without restriction,
* including without limitation the rights to use, copy, modify, merge,
* publish, distribute, sublicense, and/or sell copies of the Software,
* and to permit persons to whom the Software is furnished to do so,
* subject to the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#include <stdarg.h>
#include <reg.h>
#include <debug.h>
#include <stdio.h>
#include <assert.h>
#include <err.h>
#include <lib/cbuf.h>
#include <arch/arm/cm.h>
#include <arch/ops.h>
#include <dev/uart.h>
#include <dev/gpio.h>
#include <kernel/thread.h>
#include <platform/debug.h>
#include <platform/gpio.h>
#include <target/debugconfig.h>
#include <target/gpioconfig.h>
#define RXBUF_SIZE 16
//cbuf_t uart0_rx_buf;
void uart_init_early(void)
{
#ifdef ENABLE_UART0
#ifdef UART0_TX_PIN
gpio_config(UART0_TX_PIN,GPIO_OUTPUT);
NRF_UART0->PSELTXD = UART0_TX_PIN;
#endif
#ifdef UART0_RX_PIN
gpio_config(UART0_RX_PIN,GPIO_INPUT);
NRF_UART0->PSELRXD = UART0_RX_PIN;
#endif
NRF_UART0->BAUDRATE = UART_BAUDRATE_BAUDRATE_Baud115200 << UART_BAUDRATE_BAUDRATE_Pos;
NRF_UART0->CONFIG = UART_CONFIG_HWFC_Disabled << UART_CONFIG_HWFC_Pos | \
UART_CONFIG_PARITY_Excluded << UART_CONFIG_PARITY_Pos;
NVIC_DisableIRQ(UARTE0_UART0_IRQn);
NRF_UART0->ENABLE = UART_ENABLE_ENABLE_Enabled << UART_ENABLE_ENABLE_Pos;
NRF_UART0->TXD = 'E';
NRF_UART0->TASKS_STARTTX=1;
NRF_UART0->TASKS_STARTRX=1;
#endif //ENABLE_UART0
}
void uart_init(void)
{
#ifdef ENABLE_UART0
// cbuf_initialize(&uart0_rx_buf, RXBUF_SIZE);
// NRF_UART0->INTENSET = UART_INTENSET_RXDRDY_Enabled << UART_INTENSET_RXDRDY_Pos;
NRF_UART0->EVENTS_RXDRDY = 0;
// NVIC_EnableIRQ(UART0_IRQn);
char c = NRF_UART0->RXD;
(void)c;
#endif //ENABLE_UART0
}
void nrf52_UARTE0_UART0_IRQ(void)
{
// char c;
arm_cm_irq_entry();
/*
bool resched = false;
while ( NRF_UART0->EVENTS_RXDRDY > 0 ) {
NRF_UART0->EVENTS_RXDRDY = 0;
c = NRF_UART0->RXD;
if (!cbuf_space_avail(&uart0_rx_buf)) {
break;
}
cbuf_write_char(&uart0_rx_buf, c, false);
resched = true;
}
*/
arm_cm_irq_exit(false);
}
int uart_putc(int port, char c)
{
while (NRF_UART0->EVENTS_TXDRDY == 0);
NRF_UART0->EVENTS_TXDRDY = 0;
NRF_UART0->TXD = c;
return 1;
}
int uart_getc(int port, bool wait)
{
do {
if (NRF_UART0->EVENTS_RXDRDY > 0) {
NRF_UART0->EVENTS_RXDRDY=0;
return NRF_UART0->RXD;
}
} while (wait);
return -1;
}
void uart_flush_tx(int port) {}
void uart_flush_rx(int port) {}
void uart_init_port(int port, uint baud)
{
// TODO - later
PANIC_UNIMPLEMENTED;
}
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