/* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see .
*
*/
/** BusVoodoo RS-485 mode (code)
* @file busvoodoo_rs485.c
* @author King Kévin
* @date 2018
* @note peripherals used: USART @ref busvoodoo_rs485_usart
*/
/* standard libraries */
#include // standard integer types
#include // standard utilities
#include // string utilities
/* STM32 (including CM3) libraries */
#include // general purpose input output library
#include // real-time control clock library
#include // USART utilities
/* own libraries */
#include "global.h" // board definitions
#include "print.h" // printing utilities
#include "menu.h" // menu definitions
#include "busvoodoo_global.h" // BusVoodoo definitions
#include "busvoodoo_oled.h" // OLED utilities
#include "busvoodoo_rs485.h" // own definitions
/** @defgroup busvoodoo_rs485_usart USART peripheral used for RS-485/422 communication, using a RS-485/422 transceiver
* @{
*/
#define BUSVOODOO_RS485_USART 2 /**< USART peripheral */
/** @} */
/** mode setup stage */
static enum busvoodoo_rs485_setting_t {
BUSVOODOO_RS485_SETTING_NONE,
BUSVOODOO_RS485_SETTING_BAUDRATE,
BUSVOODOO_RS485_SETTING_DATABITS,
BUSVOODOO_RS485_SETTING_PARITY,
BUSVOODOO_RS485_SETTING_STOPBITS,
BUSVOODOO_RS485_SETTING_DONE,
} busvoodoo_rs485_setting = BUSVOODOO_RS485_SETTING_NONE; /**< current mode setup stage */
/** RS-485 baud rate (in bps) */
static uint32_t busvoodoo_rs485_baudrate = 115200;
/** RS-485 data bits */
static uint8_t busvoodoo_rs485_databits = 8;
/** RS-485 parity setting */
static uint32_t busvoodoo_rs485_parity = USART_PARITY_NONE;
/** RS-485 stop bits setting */
static uint32_t busvoodoo_rs485_stopbits = USART_STOPBITS_1;
/** setup RS-485 mode
* @param[out] prefix terminal prompt prefix
* @param[in] line terminal prompt line to configure mode
* @return if setup is complete
*/
static bool busvoodoo_rs485_setup(char** prefix, const char* line)
{
bool complete = false; // is the setup complete
if (NULL==line) { // first call
busvoodoo_rs485_setting = BUSVOODOO_RS485_SETTING_NONE; // re-start configuration
}
switch (busvoodoo_rs485_setting) {
case BUSVOODOO_RS485_SETTING_NONE:
snprintf(busvoodoo_global_string, LENGTH(busvoodoo_global_string), "baud rate in bps (1-2000000) [%u]", busvoodoo_rs485_baudrate);
*prefix = busvoodoo_global_string; // ask for baud rate
busvoodoo_rs485_setting = BUSVOODOO_RS485_SETTING_BAUDRATE;
break;
case BUSVOODOO_RS485_SETTING_BAUDRATE:
if (NULL==line || 0==strlen(line)) { // use default setting
busvoodoo_rs485_setting = BUSVOODOO_RS485_SETTING_DATABITS; // go to next setting
} else { // setting provided
uint32_t baudrate = atoi(line); // parse setting
if (baudrate>0 && baudrate<=2000000) { // check setting
busvoodoo_rs485_baudrate = baudrate; // remember setting
busvoodoo_rs485_setting = BUSVOODOO_RS485_SETTING_DATABITS; // go to next setting
}
}
if (BUSVOODOO_RS485_SETTING_DATABITS==busvoodoo_rs485_setting) { // if next setting
snprintf(busvoodoo_global_string, LENGTH(busvoodoo_global_string), "data bits (8-9) [%u]", busvoodoo_rs485_databits); // prepare next setting
*prefix = busvoodoo_global_string; // display next setting
}
break;
case BUSVOODOO_RS485_SETTING_DATABITS:
if (NULL==line || 0==strlen(line)) { // use default setting
busvoodoo_rs485_setting = BUSVOODOO_RS485_SETTING_PARITY; // go to next setting
} else { // setting provided
uint8_t databits = atoi(line); // parse setting
if (8==databits || 9==databits) { // check setting
busvoodoo_rs485_databits = databits; // remember setting
busvoodoo_rs485_setting = BUSVOODOO_RS485_SETTING_PARITY; // go to next setting
}
}
if (BUSVOODOO_RS485_SETTING_PARITY==busvoodoo_rs485_setting) { // if next setting
printf("1) none\n");
printf("2) even\n");
printf("3) odd\n");
snprintf(busvoodoo_global_string, LENGTH(busvoodoo_global_string), "parity (1,2,3) [%c]", USART_PARITY_NONE==busvoodoo_rs485_parity ? '1' : (USART_PARITY_EVEN==busvoodoo_rs485_parity ? '2' : '3')); // prepare next setting
*prefix = busvoodoo_global_string; // display next setting
}
break;
case BUSVOODOO_RS485_SETTING_PARITY:
if (NULL==line || 0==strlen(line)) { // use default setting
busvoodoo_rs485_setting = BUSVOODOO_RS485_SETTING_STOPBITS; // go to next setting
} else if (1==strlen(line)) { // setting provided
if ('1'==line[0]) { // no parity
busvoodoo_rs485_parity = USART_PARITY_NONE;
busvoodoo_rs485_setting = BUSVOODOO_RS485_SETTING_STOPBITS; // go to next setting
} else if ('2'==line[0]) { // even parity
busvoodoo_rs485_parity = USART_PARITY_EVEN;
busvoodoo_rs485_setting = BUSVOODOO_RS485_SETTING_STOPBITS; // go to next setting
} else if ('3'==line[0]) { // odd parity
busvoodoo_rs485_parity = USART_PARITY_ODD;
busvoodoo_rs485_setting = BUSVOODOO_RS485_SETTING_STOPBITS; // go to next setting
}
}
if (BUSVOODOO_RS485_SETTING_STOPBITS==busvoodoo_rs485_setting) { // if next setting
printf("1) 0.5\n");
printf("2) 1\n");
printf("3) 1.5\n");
printf("4) 2\n");
snprintf(busvoodoo_global_string, LENGTH(busvoodoo_global_string), "stop bits (1,2,3,4) [%s]", USART_STOPBITS_0_5==busvoodoo_rs485_stopbits ? "0.5" : (USART_STOPBITS_1==busvoodoo_rs485_stopbits ? "1" : (USART_STOPBITS_1_5==busvoodoo_rs485_stopbits ? "1.5" : "2.0"))); // prepare next setting
*prefix = busvoodoo_global_string; // display next setting
}
break;
case BUSVOODOO_RS485_SETTING_STOPBITS:
if (NULL==line || 0==strlen(line)) { // use default setting
busvoodoo_rs485_setting = BUSVOODOO_RS485_SETTING_DONE; // go to next setting
} else if (1==strlen(line)) { // setting provided
if ('1'==line[0]) { // 0.5 stop bits
busvoodoo_rs485_stopbits = USART_STOPBITS_0_5; // remember setting
busvoodoo_rs485_setting = BUSVOODOO_RS485_SETTING_DONE; // go to next setting
} else if ('2'==line[0]) { // 1 stop bits
busvoodoo_rs485_stopbits = USART_STOPBITS_1; // remember setting
busvoodoo_rs485_setting = BUSVOODOO_RS485_SETTING_DONE; // go to next setting
} else if ('3'==line[0]) { // 1.5 stop bits
busvoodoo_rs485_stopbits = USART_STOPBITS_1_5; // remember setting
busvoodoo_rs485_setting = BUSVOODOO_RS485_SETTING_DONE; // go to next setting
} else if ('4'==line[0]) { // 2 stop bits
busvoodoo_rs485_stopbits = USART_STOPBITS_2; // remember setting
busvoodoo_rs485_setting = BUSVOODOO_RS485_SETTING_DONE; // go to next setting
}
}
if (BUSVOODOO_RS485_SETTING_DONE==busvoodoo_rs485_setting) { // we have all settings, configure RS-485
rcc_periph_clock_enable(RCC_AFIO); // enable clock for USART alternate function
rcc_periph_clock_enable(RCC_USART(BUSVOODOO_RS485_USART)); // enable clock for USART peripheral
usart_set_baudrate(USART(BUSVOODOO_RS485_USART), busvoodoo_rs485_baudrate); // set baud rate
usart_set_databits(USART(BUSVOODOO_RS485_USART), busvoodoo_rs485_databits); // set data bits
usart_set_parity(USART(BUSVOODOO_RS485_USART), busvoodoo_rs485_parity); // set parity
usart_set_stopbits(USART(BUSVOODOO_RS485_USART), busvoodoo_rs485_stopbits); // set stop bits
usart_set_flow_control(USART(BUSVOODOO_RS485_USART), USART_FLOWCONTROL_NONE); // set no flow control
usart_set_mode(USART(BUSVOODOO_RS485_USART), USART_MODE_TX_RX); // full-duplex communication
rcc_periph_clock_enable(RCC_USART_PORT(BUSVOODOO_RS485_USART)); // enable clock for USART GPIO peripheral
gpio_set_mode(USART_TX_PORT(BUSVOODOO_RS485_USART), GPIO_MODE_OUTPUT_10_MHZ, GPIO_CNF_OUTPUT_ALTFN_PUSHPULL, USART_TX_PIN(BUSVOODOO_RS485_USART)); // setup GPIO pin USART transmit
gpio_set_mode(USART_RX_PORT(BUSVOODOO_RS485_USART), GPIO_MODE_INPUT, GPIO_CNF_INPUT_FLOAT, USART_RX_PIN(BUSVOODOO_RS485_USART)); // setup GPIO pin USART receive (no need to pull since the transceiver will drive it)
gpio_clear(GPIO(BUSVOODOO_RS485_DE_PORT), GPIO(BUSVOODOO_RS485_DE_PIN)); // set low to disable RS-485 transceiver drive
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)
gpio_set(GPIO(BUSVOODOO_RS485_RE_PORT), GPIO(BUSVOODOO_RS485_RE_PIN)); // set RS-485 transceiver Receive Enable pin high to disable received
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)
usart_enable(USART(BUSVOODOO_RS485_USART)); // enable USART
busvoodoo_led_blue_off(); // disable blue LED since there is no activity
busvoodoo_rs485_setting = BUSVOODOO_RS485_SETTING_NONE; // restart settings next time
*prefix = "RS-485/422"; // display mode
busvoodoo_oled_text_left(*prefix); // set mode title on OLED display
const char* pinout_io[10] = {"GND", "5V", "3V3", "LV", NULL, NULL, NULL, NULL, NULL, NULL}; // RS-485 mode I/O pinout
for (uint8_t i=0; i='0' && action[1]<='9') { // send decimal
return busvoodoo_rs485_action(action+1, repetition, perform); // just retry without leading 0
} else { // malformed action
return false;
}
} else if ('x'==action[0] && length>1) { // send hexadecimal value
for (uint32_t i=1; i='0' && action[i]<='9') || (action[i]>='a' && action[i]<='f') || (action[i]>='A' && action[i]<='F'))) { // check for hexadecimal character
return false; // not an hexadecimal string
}
}
if (!perform) {
return true;
}
uint32_t value = strtol(&action[1], NULL, 16); // get hex value
for (uint32_t i=0; i1) { // send binary value
for (uint32_t i=1; i'1') { // check for binary character
return false; // not a binary string
}
}
if (!perform) {
return true;
}
uint32_t value = strtol(&action[1], NULL, 2); // get binary value
for (uint32_t i=0; i='1' && action[0]<='9') { // send decimal value
for (uint32_t i=1; i'9') { // check for decimal character
return false; // not a decimal string
}
}
if (!perform) {
return true;
}
uint32_t value = strtol(&action[0], NULL, 10); // get decimal value
for (uint32_t i=0; i=2 && ('"'==action[0] || '\''==action[0]) && (action[length-1]==action[0])) { // send ASCII character
if (!perform) {
return true;
}
for (uint32_t r=0; r0) {
if (0==strcmp(argument, "h") || 0==strcmp(argument, "hex")) { // user wants hexadecimal display
display_hex = true; // remember to display in hexadecimal
} else if (0==strcmp(argument, "b") || 0==strcmp(argument, "bin")) { // user wants binary display
display_bin = true; // remember to display in binary
} else {
printf("malformed argument\n");
return;
}
}
printf("press any key to exit\n");
gpio_clear(GPIO(BUSVOODOO_RS485_RE_PORT), GPIO(BUSVOODOO_RS485_RE_PIN)); // set high to low enable RS-485 transceiver receiver
while (!user_input_available) { // check for user input to exit
if ((USART_SR(USART(BUSVOODOO_RS485_USART)) & USART_SR_RXNE)) { // verify if data has been received
uint16_t c = usart_recv(USART(BUSVOODOO_RS485_USART)); // receive character
busvoodoo_led_blue_pulse(BUSVOODOO_LED_PULSE); // enable blue LED to show reception
// remove unused bits (ignore parity bit)
if (USART_PARITY_NONE==busvoodoo_rs485_parity) { // no parity bit in frame
if (8==busvoodoo_rs485_databits) { // 8-bit frame
c &= 0xff;
} else { // 9-bit frame
c &= 0x1ff;
}
} else { // MSb is parity bit
if (8==busvoodoo_rs485_databits) { // 8-bit frame
c &= 0x7f;
} else { // 9-bit frame
c &= 0xff;
}
}
if (display_hex) { // display data in hex
if ((USART_PARITY_NONE==busvoodoo_rs485_parity) && 9==busvoodoo_rs485_databits) { // case where the final data is 9 bits long
printf("%03x ", c);
} else {
printf("%02x ", c);
}
} else if (display_bin) { // display data in binary
if (USART_PARITY_NONE==busvoodoo_rs485_parity) {
if (8==busvoodoo_rs485_databits) { // 8-bit frame
printf("%08b ", c);
} else { // 9-bit frame
printf("%09b ", c);
}
} else { // one bit is a parity bit
if (8==busvoodoo_rs485_databits) { // 8-bit frame
printf("%07b ", c);
} else { // 9-bit frame
printf("%08b ", c);
}
}
} else { // display in ASCII
printf("%c", c); // print received character
}
}
}
user_input_get(); // discard user input
gpio_set(GPIO(BUSVOODOO_RS485_RE_PORT), GPIO(BUSVOODOO_RS485_RE_PIN)); // set high to disable RS-485 transceiver receiver
printf("\n"); // get to next line
}
/** command to transmit and receive data
* @param[in] argument no argument required
*/
static void busvoodoo_rs485_command_transceive(void* argument)
{
(void)argument; // we won't use the argument
printf("press 5 times escape to exit\n");
char last_c = 0; // last user character received
uint8_t esc_count = 0; // number of times escape has press received
gpio_clear(GPIO(BUSVOODOO_RS485_RE_PORT), GPIO(BUSVOODOO_RS485_RE_PIN)); // set high to low enable RS-485 transceiver receiver
while (true) { // check for escape sequence
if (user_input_available) { // check if user wants to transmit something
char c = user_input_get(); // get user input
if (0x1b==c) { // user pressed escape
if (0x1b!=last_c) { // this is the first escape press
esc_count = 0;
}
esc_count++; // increment escape count
}
last_c = c; // remember key press
if (esc_count<5) { // check for escape sequence
while ((0==(USART_SR(USART(BUSVOODOO_RS485_USART)) & USART_SR_TXE) && !user_input_available)); // wait for transmit buffer to be empty
if (USART_SR(USART(BUSVOODOO_RS485_USART)) & USART_SR_TXE) { // we can send a character
gpio_set(GPIO(BUSVOODOO_RS485_RE_PORT), GPIO(BUSVOODOO_RS485_RE_PIN)); // set high to disable RS-485 transceiver receiver
gpio_set(GPIO(BUSVOODOO_RS485_DE_PORT), GPIO(BUSVOODOO_RS485_DE_PIN)); // set high to enable RS-485 transceiver driver
usart_send_blocking(USART(BUSVOODOO_RS485_USART), c); // send user character
busvoodoo_led_blue_pulse(BUSVOODOO_LED_PULSE); // enable blue LED to show transmission
while (0==(USART_SR(USART(BUSVOODOO_RS485_USART)) & USART_SR_TC)); // wait for transmission to be complete
gpio_clear(GPIO(BUSVOODOO_RS485_DE_PORT), GPIO(BUSVOODOO_RS485_DE_PIN)); // set low to disable RS-485 transceiver driver
gpio_clear(GPIO(BUSVOODOO_RS485_RE_PORT), GPIO(BUSVOODOO_RS485_RE_PIN)); // set high to low enable RS-485 transceiver receiver
}
} else { // user wants to exit
break; // exit infinite loop
}
}
if ((USART_SR(USART(BUSVOODOO_RS485_USART)) & USART_SR_RXNE)) { // verify if data has been received
char c = usart_recv(USART(BUSVOODOO_RS485_USART)); // receive character
busvoodoo_led_blue_pulse(BUSVOODOO_LED_PULSE); // enable blue LED to show reception
printf("%c", c); // print received character
}
}
gpio_set(GPIO(BUSVOODOO_RS485_RE_PORT), GPIO(BUSVOODOO_RS485_RE_PIN)); // set high to disable RS-485 transceiver receiver
printf("\n"); // get to next line
}
/** command to verify incoming transmission for error
* @param[in] argument argument not required
*/
static void busvoodoo_rs485_command_error(void* argument)
{
(void)argument; // argument not used
printf("press any key to exit\n");
while (!user_input_available) { // wait until user interrupt
busvoodoo_rs485_read(); // read incoming data (this also checks for errors
}
user_input_get(); // discard user input
}
/** RS-485 menu commands */
static const struct menu_command_t busvoodoo_rs485_commands[] = {
{
.shortcut = 'a',
.name = "action",
.command_description = "perform protocol actions",
.argument = MENU_ARGUMENT_STRING,
.argument_description = "[actions]",
.command_handler = &busvoodoo_rs485_command_actions,
},
{
.shortcut = 'r',
.name = "receive",
.command_description = "show incoming data [in hexadecimal or binary]",
.argument = MENU_ARGUMENT_STRING,
.argument_description = "[hex|bin]",
.command_handler = &busvoodoo_rs485_command_receive,
},
{
.shortcut = 't',
.name = "transmit",
.command_description = "transmit ASCII text (empty for CR+LF)",
.argument = MENU_ARGUMENT_STRING,
.argument_description = "[text]",
.command_handler = &busvoodoo_rs485_command_transmit,
},
{
.shortcut = 'x',
.name = "transceive",
.command_description = "transmit and receive data",
.argument = MENU_ARGUMENT_NONE,
.argument_description = NULL,
.command_handler = &busvoodoo_rs485_command_transceive,
},
{
.shortcut = 'e',
.name = "error",
.command_description = "verify incoming transmission for errors",
.argument = MENU_ARGUMENT_NONE,
.argument_description = NULL,
.command_handler = &busvoodoo_rs485_command_error,
},
};
const struct busvoodoo_mode_t busvoodoo_rs485_mode = {
.name = "rs485",
.description = "Recommended Standard 485/422",
.full_only = true,
.setup = &busvoodoo_rs485_setup,
.commands = busvoodoo_rs485_commands,
.commands_nb = LENGTH(busvoodoo_rs485_commands),
.exit = &busvoodoo_rs485_exit,
};