168 lines
7.7 KiB
C
168 lines
7.7 KiB
C
/* 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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/** BusVoodoo RS-485 mode (code)
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* @file busvoodoo_rs485.c
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* @author King Kévin <kingkevin@cuvoodoo.info>
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* @date 2018
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* @note peripherals used: USART @ref busvoodoo_rs485_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> // standard utilities
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#include <string.h> // string utilities
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/* STM32 (including CM3) libraries */
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#include <libopencm3/cm3/nvic.h> // interrupt utilities
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#include <libopencm3/stm32/gpio.h> // general purpose input output library
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#include <libopencm3/stm32/rcc.h> // real-time control clock library
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#include <libopencm3/stm32/usart.h> // USART utilities
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/* own libraries */
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#include "global.h" // board definitions
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#include "print.h" // printing utilities
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#include "menu.h" // menu definitions
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#include "busvoodoo_global.h" // BusVoodoo definitions
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#include "busvoodoo_oled.h" // OLED utilities
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#include "busvoodoo_uart_generic.h" // generic UART mode
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#include "busvoodoo_rs485.h" // own definitions
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/** @defgroup busvoodoo_rs485_usart USART peripheral used for RS-485/422 communication, using a RS-485/422 transceiver
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* @{
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*/
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#define BUSVOODOO_RS485_USART 2 /**< USART peripheral */
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/** @} */
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/** enable RS-485 transceiver driver to allow transmitting */
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static void busvoodoo_rs485_drive_enable(void)
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{
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gpio_set(GPIO(BUSVOODOO_RS485_DE_PORT), GPIO(BUSVOODOO_RS485_DE_PIN)); // set high to enable RS-485 transceiver driver
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}
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/** enable RS-485 transceiver driver to allow transmitting */
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static void busvoodoo_rs485_drive_disable(void)
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{
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gpio_clear(GPIO(BUSVOODOO_RS485_DE_PORT), GPIO(BUSVOODOO_RS485_DE_PIN)); // set low to disable RS-485 transceiver driver
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}
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/** enable RS-485 transceiver received to allow receiving */
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static void busvoodoo_rs485_receive_enable(void)
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{
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gpio_clear(GPIO(BUSVOODOO_RS485_RE_PORT), GPIO(BUSVOODOO_RS485_RE_PIN)); // set high to low enable RS-485 transceiver receiver
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}
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/** enable RS-485 transceiver received to allow receiving */
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static void busvoodoo_rs485_receive_disable(void)
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{
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gpio_set(GPIO(BUSVOODOO_RS485_RE_PORT), GPIO(BUSVOODOO_RS485_RE_PIN)); // set high to disable RS-485 transceiver receiver
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}
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#define BUSVOODOO_RS485_RX_TIMER 2 /**< timer ID to capture RX edges */
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#define BUSVOODOO_RS485_RX_CHANNEL 4 /**< channel ID used as input capture to capture RX edges */
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/** RS-485 specific methods that will be called by the generic methods */
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static const struct busvoodoo_uart_generic_specific_t busvoodoo_uart_generic_rs485 = {
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.usart = USART(BUSVOODOO_RS485_USART),
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.usart_rcc = RCC_USART(BUSVOODOO_RS485_USART),
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.usart_rst = RST_USART(BUSVOODOO_RS485_USART),
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.multidrive = false,
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.tx_port = USART_TX_PORT(BUSVOODOO_RS485_USART),
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.tx_pin = USART_TX_PIN(BUSVOODOO_RS485_USART),
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.tx_rcc = RCC_USART_PORT(BUSVOODOO_RS485_USART),
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.tx_pre = &busvoodoo_rs485_drive_enable,
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.tx_post = &busvoodoo_rs485_drive_disable,
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.rx_port = USART_RX_PORT(BUSVOODOO_RS485_USART),
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.rx_pin = USART_RX_PIN(BUSVOODOO_RS485_USART),
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.rx_rcc = RCC_USART_PORT(BUSVOODOO_RS485_USART),
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.rx_pre = &busvoodoo_rs485_receive_enable,
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.rx_post = &busvoodoo_rs485_receive_disable,
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.hwflowctl = false,
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.rts_port = 0,
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.rts_pin = 0,
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.rts_rcc = 0,
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.cts_port = 0,
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.cts_pin = 0,
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.cts_rcc = 0,
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.timer = TIM(BUSVOODOO_RS485_RX_TIMER),
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.timer_rcc = RCC_TIM(BUSVOODOO_RS485_RX_TIMER),
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.timer_port = TIM_CH_PORT(BUSVOODOO_RS485_RX_TIMER, BUSVOODOO_RS485_RX_CHANNEL),
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.timer_port_rcc = RCC_TIM_CH(BUSVOODOO_RS485_RX_TIMER, BUSVOODOO_RS485_RX_CHANNEL),
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.timer_pin = TIM_CH_PIN(BUSVOODOO_RS485_RX_TIMER, BUSVOODOO_RS485_RX_CHANNEL),
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.timer_ic = TIM_IC(BUSVOODOO_RS485_RX_CHANNEL),
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.timer_ic_in_ti = TIM_IC_IN_TI(BUSVOODOO_RS485_RX_CHANNEL),
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.timer_sr_ccif = TIM_SR_CCIF(BUSVOODOO_RS485_RX_CHANNEL),
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.timer_sr_ccof = TIM_SR_CCOF(BUSVOODOO_RS485_RX_CHANNEL),
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.timer_ccr = &TIM_CCR(BUSVOODOO_RS485_RX_TIMER, BUSVOODOO_RS485_RX_CHANNEL),
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.timer_dier_ccie = TIM_DIER_CCIE(BUSVOODOO_RS485_RX_CHANNEL),
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.timer_nvic_irq = NVIC_TIM_IRQ(BUSVOODOO_RS485_RX_TIMER),
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};
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/** setup RS-485 mode
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* @param[out] prefix terminal prompt prefix
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* @param[in] line terminal prompt line to configure mode
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* @return if setup is complete
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*/
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static bool busvoodoo_rs485_setup(char** prefix, const char* line)
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{
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bool complete = false; // is the setup complete
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if (NULL==line) { // first call
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busvoodoo_uart_generic_configure(&busvoodoo_uart_generic_rs485); // provide the RS-485 specific information
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}
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complete = busvoodoo_uart_generic_setup(prefix, line); // configure underlying generic UART
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if (complete) { // generic configuration finished
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gpio_clear(GPIO(BUSVOODOO_RS485_DE_PORT), GPIO(BUSVOODOO_RS485_DE_PIN)); // set low to disable RS-485 transceiver drive
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gpio_set_mode(GPIO(BUSVOODOO_RS485_DE_PORT), GPIO_MODE_OUTPUT_10_MHZ, GPIO_CNF_OUTPUT_PUSHPULL, GPIO(BUSVOODOO_RS485_DE_PIN)); // setup RS-485 Drive Enable GPIO as output (pulled low to disable by default)
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gpio_set(GPIO(BUSVOODOO_RS485_RE_PORT), GPIO(BUSVOODOO_RS485_RE_PIN)); // set RS-485 transceiver Receive Enable pin high to disable received
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gpio_set_mode(GPIO(BUSVOODOO_RS485_RE_PORT), GPIO_MODE_OUTPUT_10_MHZ, GPIO_CNF_OUTPUT_OPENDRAIN, GPIO(BUSVOODOO_RS485_RE_PIN)); // setup RS-485 Receive Enable GPIO as output (pulled high to disable by default)
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busvoodoo_led_blue_off(); // disable blue LED because there is no activity
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*prefix = "RS-485/422"; // display mode
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busvoodoo_oled_text_left(*prefix); // set mode title on OLED display
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const char* pinout_io[10] = {"GND", "5V", "3V3", "LV", NULL, NULL, NULL, NULL, NULL, NULL}; // RS-485 mode I/O pinout
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for (uint8_t i=0; i<LENGTH(pinout_io) && i<LENGTH(busvoodoo_global_pinout_io); i++) {
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busvoodoo_global_pinout_io[i] = pinout_io[i]; // set pin names
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}
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#if BUSVOODOO_HARDWARE_VERSION==0
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const char* pinout_rscan[5] = {"HV", NULL, NULL, "B", "A"}; // RS-485 mode RS/CAN pinout for hardware version 0
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#else
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const char* pinout_rscan[5] = {"HV", NULL, "A", "B", NULL}; // RS-485 mode RS/CAN pinout
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#endif
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for (uint8_t i=0; i<LENGTH(pinout_rscan) && i<LENGTH(busvoodoo_global_pinout_rscan); i++) {
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busvoodoo_global_pinout_rscan[i] = pinout_rscan[i]; // set pin names
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}
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const char* pinout[10] = {pinout_rscan[0], pinout_io[0], pinout_rscan[1], pinout_io[2], pinout_rscan[2], pinout_io[4], pinout_rscan[3], pinout_io[6], pinout_rscan[4], pinout_io[8]}; // pinout to display
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busvoodoo_oled_text_pinout((const char**)pinout, false); // set pinout on display
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busvoodoo_oled_update(); // update display to show text and pinout
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}
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return complete;
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}
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/** exit RS-485 mode
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*/
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static void busvoodoo_rs485_exit(void)
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{
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busvoodoo_uart_generic_exit(); // exiting the underlying generic UART does everything we need
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gpio_set(GPIO(BUSVOODOO_RS485_RE_PORT), GPIO(BUSVOODOO_RS485_RE_PIN)); // set high to disable RS-485 transceiver receiver
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gpio_clear(GPIO(BUSVOODOO_RS485_DE_PORT), GPIO(BUSVOODOO_RS485_DE_PIN)); // set low to disable RS-485 transceiver driver
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}
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const struct busvoodoo_mode_t busvoodoo_rs485_mode = {
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.name = "rs485",
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.description = "Recommended Standard 485/422",
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.full_only = true,
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.setup = &busvoodoo_rs485_setup,
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.commands = busvoodoo_uart_generic_commands,
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.commands_nb = busvoodoo_uart_generic_commands_nb,
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.exit = &busvoodoo_rs485_exit,
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};
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