mirror of
https://github.com/m5stack/M5Stack_MicroPython.git
synced 2026-09-17 00:30:38 -07:00
Boris Lovosevic
f2b25e261d
libcurl based email function implemented Fixed GPIO initialization after deepsleep if ext0 or ext1 wake up source was used Licensing information updated Some unneeded sources removed
303 lines
8.9 KiB
C
303 lines
8.9 KiB
C
*
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* This file is part of the MicroPython ESP32 project, https://github.com/loboris/MicroPython_ESP32_psRAM_LoBo
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*
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* The MIT License (MIT)
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*
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* Copyright (c) 2018 LoBo (https://github.com/loboris)
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* 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, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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// UART.C
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//
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// Generic software uart written in C, requiring a timer set to 3 times
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// the baud rate, and two software read/write pins for the receive and
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// transmit functions.
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//
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// * Received characters are buffered
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// * putchar(), getchar(), kbhit() and flush_input_buffer() are available
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// * There is a facility for background processing while waiting for input
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//
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// Colin Gittins, Software Engineer, Halliburton Energy Services
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//
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// The baud rate can be configured by changing the BAUD_RATE macro as
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// follows:
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//
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// #define BAUD_RATE 19200.0
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//
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// The function init_uart() must be called before any comms can take place
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//
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// Interface routines required:
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// 1. get_rx_pin_status()
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// Returns 0 or 1 dependent on whether the receive pin is high or low.
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// 2. set_tx_pin_high()
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// Sets the transmit pin to the high state.
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// 3. set_tx_pin_low()
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// Sets the transmit pin to the low state.
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// 4. idle()
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// Background functions to execute while waiting for input.
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// 5. timer_set( BAUD_RATE )
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// Sets the timer to 3 times the baud rate.
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// 6. set_timer_interrupt( timer_isr )
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// Enables the timer interrupt.
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//
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// Functions provided:
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// 1. void flush_input_buffer( void )
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// Clears the contents of the input buffer.
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// 2. char kbhit( void )
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// Tests whether an input character has been received.
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// 3. char getchar( void )
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// Reads a character from the input buffer, waiting if necessary.
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// 4. void turn_rx_on( void )
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// Turns on the receive function.
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// 5. void turn_rx_off( void )
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// Turns off the receive function.
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// 6. void putchar( char )
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// Writes a character to the serial port.
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#include "sdkconfig.h"
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#ifdef CONFIG_USE_SOFTUART
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#include <stdio.h>
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#include "driver/timer.h"
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#include "driver/gpio.h"
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#define BAUD_RATE 19200.0
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#define IN_BUF_SIZE 256
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#define TRUE 1
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#define FALSE 0
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static unsigned char inbuf[IN_BUF_SIZE];
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static unsigned char qin = 0;
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static unsigned char qout = 0;
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static char flag_rx_waiting_for_stop_bit;
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static char flag_rx_off;
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static char rx_mask;
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static char flag_rx_ready;
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static char flag_tx_ready;
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static char timer_rx_ctr;
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static char timer_tx_ctr;
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static char bits_left_in_rx;
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static char bits_left_in_tx;
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static char rx_num_of_bits;
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static char tx_num_of_bits;
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static char internal_rx_buffer;
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static char internal_tx_buffer;
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static char user_tx_buffer;
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static int bdrate = 19200;
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static intr_handle_t int_handle;
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static uint8_t rx_gpio_num = 26;
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static uint8_t tx_gpio_num = 27;
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static int bdr_fact = 3;
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static uint8_t tmr_group = 1;
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static uint8_t tmr_id = 1;
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// Interface routines required:
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// 1. get_rx_pin_status()
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// Returns 0 or 1 dependent on whether the receive pin is high or low.
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//#define get_rx_pin_status()
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// 2. set_tx_pin_high()
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// Sets the transmit pin to the high state.
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//#define set_tx_pin_high()
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// 3. set_tx_pin_low()
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// Sets the transmit pin to the low state.
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//#define set_tx_pin_high()
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// 4. idle()
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#define idle
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// Background functions to execute while waiting for input.
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// 5. timer_set( BAUD_RATE )
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// Sets the timer to 3 times the baud rate.
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//#define timer_set( BAUD_RATE )
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// 6. set_timer_interrupt( timer_isr )
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// Enables the timer interrupt.
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//#define set_timer_interrupt( timer_isr )
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#define TIMER_FLAGS 0
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//---------------------------------------------------------
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static void timer_set()
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{
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timer_config_t config;
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config.counter_dir = TIMER_COUNT_UP;
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config.intr_type = TIMER_INTR_LEVEL;
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config.counter_en = TIMER_PAUSE;
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config.alarm_en = TIMER_ALARM_EN;
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config.auto_reload = 1;
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config.divider = 2;
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uint64_t alarm = 40000000 / (bdrate * bdr_fact);
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uint64_t modalarm = 40000000 % (bdrate * bdr_fact);
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if (modalarm > (bdrate / 2)) alarm +=1;
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timer_init(1, 1, &config);
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// Timer's counter will initially start from value below.
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// Also, if auto_reload is set, this value will be automatically reload on alarm
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timer_set_counter_value(tmr_group, tmr_id, 0x00000000ULL);
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// Configure the alarm value and the interrupt on alarm.
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timer_set_alarm_value(tmr_group, tmr_id, alarm);
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// Enable timer interrupt
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timer_enable_intr(tmr_group, tmr_id);
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// Register interrupt callback
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timer_isr_register(tmr_group, tmr_id, timer_isr, NULL, TIMER_FLAGS, &int_handle);
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timer_start(tmr_group, tmr_id);
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}
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//-----------------------------------
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static void IRAM_ATTR timer_isr(void)
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{
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uint8_t mask, start_bit, flag_in;
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// Transmitter Section
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if ( flag_tx_ready ) {
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if ( --timer_tx_ctr<=0 ) {
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mask = internal_tx_buffer & 1;
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internal_tx_buffer >>= 1;
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gpio_set_level(tx_gpio_num, mask);
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timer_tx_ctr = bdr_fact;
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if ( --bits_left_in_tx<=0 ) flag_tx_ready = FALSE;
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}
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}
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// Receiver Section
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if ( flag_rx_off==FALSE ) {
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if ( flag_rx_waiting_for_stop_bit ) {
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if ( --timer_rx_ctr<=0 ) {
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flag_rx_waiting_for_stop_bit = FALSE;
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flag_rx_ready = FALSE;
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internal_rx_buffer &= 0xFF;
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if ( internal_rx_buffer!=0xC2 ) {
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inbuf[qin] = internal_rx_buffer;
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if ( ++qin>=IN_BUF_SIZE ) qin = 0;
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}
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}
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}
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else { // rx_test_busy
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if ( flag_rx_ready==FALSE )
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{
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start_bit = gpio_get_level(rx_gpio_num);
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// Test for Start Bit
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if ( start_bit==0 ) {
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flag_rx_ready = TRUE;
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internal_rx_buffer = 0;
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timer_rx_ctr = 4;
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bits_left_in_rx = rx_num_of_bits;
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rx_mask = 1;
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}
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}
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else { // rx_busy
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if ( --timer_rx_ctr<=0 ) { // rcv
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timer_rx_ctr = 3;
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flag_in = gpio_get_level(rx_gpio_num);
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if ( flag_in ) internal_rx_buffer |= rx_mask;
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rx_mask <<= 1;
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if ( --bits_left_in_rx<=0 ) flag_rx_waiting_for_stop_bit = TRUE;
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}
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}
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}
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}
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}
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//-------------------------
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void soft_uart_init(uint16_t timer, uint8_t rx_num, uint8_t tx_num, int bdr)
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{
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flag_tx_ready = FALSE;
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flag_rx_ready = FALSE;
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flag_rx_waiting_for_stop_bit = FALSE;
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flag_rx_off = FALSE;
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rx_num_of_bits = 10;
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tx_num_of_bits = 10;
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rx_gpio_num = rx_num;
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tx_gpio_num = tx_num;
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bdrate = bdr;
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gpio_pad_select_gpio(rx_gpio_num);
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gpio_pad_select_gpio(tx_gpio_num);
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gpio_set_level(rx_gpio_num, 1);
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gpio_set_level(tx_gpio_num, 1);
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gpio_set_direction(rx_gpio_num, GPIO_MODE_INPUT);
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gpio_set_pull_mode(rx_gpio_num, GPIO_PULLUP_ONLY);
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gpio_set_direction(tx_gpio_num, GPIO_MODE_OUTPUT);
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timer_set(bdrate);
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}
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//-------------------
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char _getchar( void )
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{
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char ch;
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do
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{
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while ( qout==qin )
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{
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idle();
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}
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ch = inbuf[qout] & 0xFF;
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if ( ++qout>=IN_BUF_SIZE )
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{
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qout = 0;
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}
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}
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while ( ch==0x0A || ch==0xC2 );
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return( ch );
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}
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void _putchar( char ch )
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{
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while ( flag_tx_ready );
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user_tx_buffer = ch;
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// invoke_UART_transmit
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timer_tx_ctr = 3;
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bits_left_in_tx = tx_num_of_bits;
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internal_tx_buffer = (user_tx_buffer<<1) | 0x200;
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flag_tx_ready = TRUE;
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}
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void flush_input_buffer( void )
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{
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qin = 0;
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qout = 0;
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}
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char kbhit( void )
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{
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return( qin!=qout );
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}
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void turn_rx_on( void )
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{
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flag_rx_off = FALSE;
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}
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void turn_rx_off( void )
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{
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flag_rx_off = TRUE;
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}
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#endif
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