118 lines
4.1 KiB
C
118 lines
4.1 KiB
C
/*
|
|
* The MIT License (MIT)
|
|
*
|
|
* Copyright (c) 2015 Johan Kanflo (github.com/kanflo)
|
|
*
|
|
* 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 <esp8266.h>
|
|
#include <FreeRTOS.h>
|
|
#include <semphr.h>
|
|
#include <stdio.h>
|
|
|
|
#if (configUSE_COUNTING_SEMAPHORES == 0)
|
|
#error "You need to define configUSE_COUNTING_SEMAPHORES in a local FreeRTOSConfig.h, see examples/terminal/FreeRTOSConfig.h"
|
|
#endif
|
|
|
|
// IRQ driven UART RX driver for ESP8266 written for use with esp-open-rtos
|
|
// TODO: Handle UART1
|
|
|
|
#ifndef UART0
|
|
#define UART0 (0)
|
|
#endif
|
|
|
|
#define UART0_RX_SIZE (128) // ESP8266 UART HW FIFO size
|
|
|
|
static xSemaphoreHandle uart0_sem = NULL;
|
|
static bool inited = false;
|
|
static void uart0_rx_init(void);
|
|
|
|
IRAM void uart0_rx_handler(void)
|
|
{
|
|
// TODO: Handle UART1, see reg 0x3ff20020, bit2, bit0 represents uart1 and uart0 respectively
|
|
if (!UART(UART0).INT_STATUS & UART_INT_STATUS_RXFIFO_FULL) {
|
|
return;
|
|
}
|
|
// printf(" [%08x (%d)]\n", READ_PERI_REG(UART_INT_ST(UART0)), READ_PERI_REG(UART_STATUS(UART0)) & (UART_RXFIFO_CNT << UART_RXFIFO_CNT_S));
|
|
if (UART(UART0).INT_STATUS & UART_INT_STATUS_RXFIFO_FULL) {
|
|
UART(UART0).INT_CLEAR = UART_INT_CLEAR_RXFIFO_FULL;
|
|
if (UART(UART0).STATUS & (UART_STATUS_RXFIFO_COUNT_M << UART_STATUS_RXFIFO_COUNT_S)) {
|
|
long int xHigherPriorityTaskWoken;
|
|
_xt_isr_mask(1 << INUM_UART);
|
|
_xt_clear_ints(1<<INUM_UART);
|
|
xSemaphoreGiveFromISR(uart0_sem, &xHigherPriorityTaskWoken);
|
|
if(xHigherPriorityTaskWoken) {
|
|
portYIELD();
|
|
}
|
|
}
|
|
} else {
|
|
printf("Error: unexpected uart irq, INT_STATUS 0x%02x\n", UART(UART0).INT_STATUS);
|
|
}
|
|
}
|
|
|
|
uint32_t uart0_num_char(void)
|
|
{
|
|
uint32_t count;
|
|
if (!inited) uart0_rx_init();
|
|
count = UART(UART0).STATUS & (UART_STATUS_RXFIFO_COUNT_M << UART_STATUS_RXFIFO_COUNT_S);
|
|
return count;
|
|
}
|
|
|
|
// _read_r in core/newlib_syscalls.c will be skipped by the linker in favour
|
|
// of this function
|
|
long _read_r(struct _reent *r, int fd, char *ptr, int len)
|
|
{
|
|
if (!inited) uart0_rx_init();
|
|
for(int i = 0; i < len; i++) {
|
|
if (!(UART(UART0).STATUS & (UART_STATUS_RXFIFO_COUNT_M << UART_STATUS_RXFIFO_COUNT_S))) {
|
|
_xt_isr_unmask(1 << INUM_UART);
|
|
if (!xSemaphoreTake(uart0_sem, portMAX_DELAY)) {
|
|
printf("\nFailed to get sem\n");
|
|
}
|
|
}
|
|
ptr[i] = UART(UART0).FIFO & (UART_FIFO_DATA_M << UART_FIFO_DATA_S);
|
|
}
|
|
return len;
|
|
}
|
|
|
|
static void uart0_rx_init(void)
|
|
{
|
|
int trig_lvl = 1;
|
|
uart0_sem = xSemaphoreCreateCounting(UART0_RX_SIZE, 0);
|
|
|
|
_xt_isr_attach(INUM_UART, uart0_rx_handler);
|
|
_xt_isr_unmask(1 << INUM_UART);
|
|
|
|
// reset the rx fifo
|
|
uint32_t conf = UART(UART0).CONF0;
|
|
UART(UART0).CONF0 = conf | UART_CONF0_RXFIFO_RESET;
|
|
UART(UART0).CONF0 = conf & ~UART_CONF0_RXFIFO_RESET;
|
|
|
|
// set rx fifo trigger
|
|
UART(UART0).CONF1 |= (trig_lvl & UART_CONF1_RXFIFO_FULL_THRESHOLD_M) << UART_CONF1_RXFIFO_FULL_THRESHOLD_S;
|
|
|
|
// clear all interrupts
|
|
UART(UART0).INT_CLEAR = 0x1ff;
|
|
|
|
// enable rx_interrupt
|
|
UART(UART0).INT_ENABLE = UART_INT_ENABLE_RXFIFO_FULL;
|
|
|
|
inited = true;
|
|
}
|