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