add ESP8266 WiFi SoC library
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/* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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/** library to send data using ESP8266 WiFi SoC (code)
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* @file radio_esp8266.c
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* @author King Kévin <kingkevin@cuvoodoo.info>
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* @date 2016
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* @note peripherals used: USART @ref radio_esp8266_usart
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*/
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/* standard libraries */
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#include <stdint.h> // standard integer types
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#include <stdlib.h> // general utilities
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#include <string.h> // string and memory utilities
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/* STM32 (including CM3) libraries */
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#include <libopencm3/stm32/rcc.h> // real-time control clock library
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#include <libopencm3/stm32/gpio.h> // general purpose input output library
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#include <libopencm3/stm32/usart.h> // universal synchronous asynchronous receiver transmitter library
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#include <libopencm3/cm3/nvic.h> // interrupt handler
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#include <libopencmsis/core_cm3.h> // Cortex M3 utilities
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#include "radio_esp8266.h" // radio header and definitions
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#include "global.h" // common methods
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/** @defgroup radio_esp8266_usart USART peripheral used for communication with radio
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* @{
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*/
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#define RADIO_ESP8266_USART 2 /**< USART peripheral */
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/** @} */
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/* input and output buffers and used memory */
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static uint8_t rx_buffer[24] = {0}; /**< buffer for received data (we only expect AT responses) */
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static volatile uint16_t rx_used = 0; /**< number of byte in receive buffer */
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static uint8_t tx_buffer[256] = {0}; /**< buffer for data to transmit */
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static volatile uint16_t tx_used = 0; /**< number of bytes used in transmit buffer */
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volatile bool radio_esp8266_activity = false;
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volatile bool radio_esp8266_success = false;
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void radio_esp8266_setup(void)
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{
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/* enable USART I/O peripheral */
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rcc_periph_clock_enable(RCC_AFIO); // enable pin alternate function (USART)
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rcc_periph_clock_enable(USART_PORT_RCC(RADIO_ESP8266_USART)); // enable clock for USART port peripheral
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rcc_periph_clock_enable(USART_RCC(RADIO_ESP8266_USART)); // enable clock for USART peripheral
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gpio_set_mode(USART_PORT(RADIO_ESP8266_USART), GPIO_MODE_OUTPUT_2_MHZ, GPIO_CNF_OUTPUT_ALTFN_PUSHPULL, USART_PIN_TX(RADIO_ESP8266_USART)); // setup GPIO pin USART transmit
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gpio_set_mode(USART_PORT(RADIO_ESP8266_USART), GPIO_MODE_INPUT, GPIO_CNF_INPUT_PULL_UPDOWN, USART_PIN_RX(RADIO_ESP8266_USART)); // setup GPIO pin USART receive
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gpio_set(USART_PORT(RADIO_ESP8266_USART), USART_PIN_RX(RADIO_ESP8266_USART)); // pull up to avoid noise when not connected
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/* setup USART parameters for ESP8266 AT firmware */
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usart_set_baudrate(USART(RADIO_ESP8266_USART), 115200); // AT firmware 0.51 (SDK 1.5.0) uses 115200 bps
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usart_set_databits(USART(RADIO_ESP8266_USART), 8);
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usart_set_stopbits(USART(RADIO_ESP8266_USART), USART_STOPBITS_1);
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usart_set_mode(USART(RADIO_ESP8266_USART), USART_MODE_TX_RX);
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usart_set_parity(USART(RADIO_ESP8266_USART), USART_PARITY_NONE);
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usart_set_flow_control(USART(RADIO_ESP8266_USART), USART_FLOWCONTROL_NONE);
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nvic_enable_irq(USART_IRQ(RADIO_ESP8266_USART)); // enable the USART interrupt
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usart_enable_rx_interrupt(USART(RADIO_ESP8266_USART)); // enable receive interrupt
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usart_enable(USART(RADIO_ESP8266_USART)); // enable USART
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/* reset buffer states */
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rx_used = 0;
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tx_used = 0;
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radio_esp8266_activity = false;
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radio_esp8266_success = false;
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radio_esp8266_send((uint8_t*)"AT\r\n",4); // verify if module is present
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while (!radio_esp8266_activity || !radio_esp8266_success) { // wait for response
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__WFI(); // sleep until something happened
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}
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radio_esp8266_send((uint8_t*)"AT+RST\r\n",8); // reset module
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while (!radio_esp8266_activity || !radio_esp8266_success) { // wait for response
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__WFI(); // sleep until something happened
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}
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radio_esp8266_send((uint8_t*)"ATE0\r\n",6); // disable echoing
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while (!radio_esp8266_activity || !radio_esp8266_success) { // wait for response
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__WFI(); // sleep until something happened
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}
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while(rx_used<13 || !memmem((char*)rx_buffer, rx_used, "WIFI GOT IP\r\n", 13)) { // wait to have IP
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__WFI(); // sleep until something happened
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}
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}
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void radio_esp8266_send(uint8_t* data, uint8_t length) {
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while (tx_used || !usart_get_flag(USART(RADIO_ESP8266_USART), USART_SR_TXE)) { // wait until ongoing transmission completed
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usart_enable_tx_interrupt(USART(RADIO_ESP8266_USART)); // enable transmit interrupt
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__WFI(); // sleep until something happened
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}
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usart_disable_tx_interrupt(USART(RADIO_ESP8266_USART)); // ensure transmit interrupt is disable to prevent index corruption (the ISR should already have done it)
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radio_esp8266_activity = false; // reset status because of new activity
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for (tx_used=0; tx_used<length && tx_used<LENGTH(tx_buffer); tx_used++) { // copy data
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tx_buffer[tx_used] = data[length-1-tx_used]; // put character in buffer (in reverse order)
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}
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if (tx_used) {
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usart_enable_tx_interrupt(USART(RADIO_ESP8266_USART)); // enable interrupt to send bytes
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}
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}
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/** USART interrupt service routine called when data has been transmitted or received */
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void USART_ISR(RADIO_ESP8266_USART)(void)
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{
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if (usart_get_interrupt_source(USART(RADIO_ESP8266_USART), USART_SR_TXE)) { // data has been transmitted
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if (tx_used) { // there is still data in the buffer to transmit
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usart_send(USART(RADIO_ESP8266_USART),tx_buffer[tx_used-1]); // put data in transmit register
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tx_used--; // update used size
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} else { // no data in the buffer to transmit
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usart_disable_tx_interrupt(USART(RADIO_ESP8266_USART)); // disable transmit interrupt
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}
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}
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if (usart_get_interrupt_source(USART(RADIO_ESP8266_USART), USART_SR_RXNE)) { // data has been received
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while (rx_used>=LENGTH(rx_buffer)) { // if buffer is full
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memmove(rx_buffer,&rx_buffer[1],LENGTH(rx_buffer)-1); // drop old data to make space (ring buffer are more efficient but harder to handle)
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rx_used--; // update used buffer information
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}
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rx_buffer[rx_used++] = usart_recv(USART(RADIO_ESP8266_USART)); // put character in buffer
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// if the used send a packet with these strings during the commands I'm fucked (AT commands are hard to handle perfectly)
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// ideally memmem would not be done in ISR (takes quite long)
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if (rx_used>=4 && memmem((char*)rx_buffer, rx_used, "OK\r\n", 4)) { // OK received
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radio_esp8266_activity = true; // response received
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radio_esp8266_success = true; // command succeeded
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rx_used = 0; // reset buffer
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} else if (rx_used>=7 && memmem((char*)rx_buffer, rx_used, "ERROR\r\n", 7)) { // ERROR received
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radio_esp8266_activity = true; // response received
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radio_esp8266_success = false; // command failed
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rx_used = 0; // reset buffer
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}
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}
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}
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@ -0,0 +1,47 @@
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/* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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/** library to send data using ESP8266 WiFi SoC (API)
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* @file radio_esp8266.h
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* @author King Kévin <kingkevin@cuvoodoo.info>
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* @date 2016
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* @note peripherals used: USART @ref radio_esp8266_usart
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*/
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#pragma once
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/** a response has been returned by the radio */
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extern volatile bool radio_esp8266_activity;
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/** the last command has succeeded */
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extern volatile bool radio_esp8266_success;
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/** setup peripherals to communicate with radio
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* @note this is blocking to ensure we are connected to the WiFi network
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*/
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void radio_esp8266_setup(void);
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/** establish TCP connection
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* @param[in] host host to connect to
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* @param[in] port TCP port to connect to
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* @note wait for activity to get success status
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*/
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void radio_esp8266_tcp_open(char* host, uint32_t port);
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/** send data (requires established connection)
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* @param[in] data data to send
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* @param[in] length size of data to send
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* @note wait for activity to get success status
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*/
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void radio_esp8266_send(uint8_t* data, uint8_t length);
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/** close established connection
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* @note wait for activity to get success status
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*/
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void radio_esp8266_close(void);
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