Transparent bridge used for UART to RF868 bridging.

This commit is contained in:
Nathael Pajani 2021-01-03 20:52:56 +01:00
commit 49a0c61777
3 changed files with 316 additions and 0 deletions

View File

@ -0,0 +1,21 @@
# Makefile for apps
MODULE = $(shell basename $(shell cd .. && pwd && cd -))
NAME = $(shell basename $(CURDIR))
# Add this to your ~/.vimrc in order to get proper function of :make in vim :
# let $COMPILE_FROM_IDE = 1
ifeq ($(strip $(COMPILE_FROM_IDE)),)
PRINT_DIRECTORY = --no-print-directory
else
PRINT_DIRECTORY =
LANG = C
endif
.PHONY: $(NAME).bin
$(NAME).bin:
@make -C ../../.. ${PRINT_DIRECTORY} NAME=$(NAME) MODULE=$(MODULE) apps/$(MODULE)/$(NAME)/$@
clean mrproper:
@make -C ../../.. ${PRINT_DIRECTORY} $@

28
transparent_bridge/README Normal file
View File

@ -0,0 +1,28 @@
Support for the Sub 1GHz module in USB or UEXT version
Copyright 2013 Nathael Pajani <nathael.pajani@ed3l.fr>
/* ****************************************************************************
* 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 <http://www.gnu.org/licenses/>.
*
*************************************************************************** */
This module uses the CC1101 transceiver to provide Sub 1GHz Rf connectivity.
The module also integrates a TMP101 temparature sensor, the usual bi-color led
used for status, a RTC quartz, a DC-DC step-up for button battery power source
support, and an extension port with a set of gpio, including ADC (2), PWM (2),
I2C and SWD debug port.

267
transparent_bridge/main.c Normal file
View File

@ -0,0 +1,267 @@
/****************************************************************************
* apps/rf_sub1G/transparent_bridge/main.c
*
* sub1G_module support code - Transparent bridge
*
* Copyright 2021 Nathael Pajani <nathael.pajani@ed3l.fr>
*
*
* 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 <http://www.gnu.org/licenses/>.
*
*************************************************************************** */
#include "core/system.h"
#include "core/systick.h"
#include "core/pio.h"
#include "lib/stdio.h"
#include "drivers/serial.h"
#include "drivers/gpio.h"
#include "drivers/ssp.h"
#include "extdrv/cc1101.h"
#include "extdrv/status_led.h"
#define MODULE_VERSION 0x03
#define MODULE_NAME "RF Sub1G"
#define DEBUG 1
#undef DEBUG
#define BUFF_LEN 60
#define SELECTED_FREQ FREQ_SEL_48MHz
/***************************************************************************** */
/* Pins configuration */
/* pins blocks are passed to set_pins() for pins configuration.
* Unused pin blocks can be removed safely with the corresponding set_pins() call
* All pins blocks may be safelly merged in a single block for single set_pins() call..
*/
const struct pio_config common_pins[] = {
/* UART 0 */
{ LPC_UART0_RX_PIO_0_1, LPC_IO_DIGITAL },
{ LPC_UART0_TX_PIO_0_2, LPC_IO_DIGITAL },
/* SPI */
{ LPC_SSP0_SCLK_PIO_0_14, LPC_IO_DIGITAL },
{ LPC_SSP0_MOSI_PIO_0_17, LPC_IO_DIGITAL },
{ LPC_SSP0_MISO_PIO_0_16, LPC_IO_DIGITAL },
/* GPIO */
{ LPC_GPIO_0_15, LPC_IO_DIGITAL },
{ LPC_GPIO_0_6, LPC_IO_DIGITAL },
{ LPC_GPIO_0_7, LPC_IO_DIGITAL },
ARRAY_LAST_PIO,
};
const struct pio cc1101_cs_pin = LPC_GPIO_0_15;
const struct pio cc1101_miso_pin = LPC_SSP0_MISO_PIO_0_16;
const struct pio cc1101_gdo0 = LPC_GPIO_0_6;
const struct pio cc1101_gdo2 = LPC_GPIO_0_7;
const struct pio status_led_green = LPC_GPIO_0_28;
const struct pio status_led_red = LPC_GPIO_0_29;
/***************************************************************************** */
void system_init()
{
/* Stop the watchdog */
startup_watchdog_disable(); /* Do it right now, before it gets a chance to break in */
system_brown_out_detection_config(0); /* No ADC used */
system_set_default_power_state();
clock_config(SELECTED_FREQ);
set_pins(common_pins);
gpio_on();
/* System tick timer MUST be configured and running in order to use the sleeping
* functions */
systick_timer_on(1); /* 1ms */
systick_start();
}
/* Define our fault handler. This one is not mandatory, the dummy fault handler
* will be used when it's not overridden here.
* Note : The default one does a simple infinite loop. If the watchdog is deactivated
* the system will hang.
*/
void fault_info(const char* name, uint32_t len)
{
uprintf(UART0, name);
while (1);
}
/******************************************************************************/
/* RF Communication */
#define RF_BUFF_LEN 64
static volatile int check_rx = 0;
void rf_rx_calback(uint32_t gpio)
{
check_rx = 1;
}
static uint8_t rf_specific_settings[] = {
CC1101_REGS(gdo_config[2]), 0x07, /* GDO_0 - Assert on CRC OK | Disable temp sensor */
CC1101_REGS(gdo_config[0]), 0x2E, /* GDO_2 - FIXME : do something usefull with it for tests */
CC1101_REGS(pkt_ctrl[0]), 0x0F, /* Accept all sync, CRC err auto flush, Append, Addr check and full bcast */
};
/* RF config */
void rf_config(void)
{
config_gpio(&cc1101_gdo0, LPC_IO_MODE_PULL_UP, GPIO_DIR_IN, 0);
cc1101_init(0, &cc1101_cs_pin, &cc1101_miso_pin); /* ssp_num, cs_pin, miso_pin */
/* Set default config */
cc1101_config();
/* And change application specific settings */
cc1101_update_config(rf_specific_settings, sizeof(rf_specific_settings));
set_gpio_callback(rf_rx_calback, &cc1101_gdo0, EDGE_RISING);
#ifdef DEBUG
uprintf(UART0, "CC1101 RF link init done.\n");
#endif
}
void handle_rf_rx_data(void)
{
uint8_t data[RF_BUFF_LEN];
int8_t ret = 0;
uint8_t status = 0, i = 0;
/* Check for received packet (and get it if any) */
ret = cc1101_receive_packet(data, RF_BUFF_LEN, &status);
/* Go back to RX mode */
cc1101_enter_rx_mode();
#ifdef DEBUG
uprintf(UART0, "RF: ret:%d, st: %d.\n", ret, status);
#endif
if (ret > 0) {
#ifdef DEBUG
uprintf(UART0, "## RF Data :\n");
#endif
for (i = 0; i < ret; i++) {
uprintf(UART0, "%c", data[i]);
}
#ifdef DEBUG
uprintf(UART0, "\n## RF Data End\n");
#endif
}
}
/* Data sent on radio comes from the UART, put any data received from UART in
* cc_tx_buff and send when either '\r' or '\n' is received.
* This function is very simple and data received between cc_tx flag set and
* cc_ptr rewind to 0 may be lost. */
static volatile uint8_t cc_tx = 0;
static volatile uint8_t cc_tx_buff[RF_BUFF_LEN];
void handle_uart_cmd(uint8_t c)
{
static uint8_t len = 0;
static uint8_t cc_ptr = 0;
/* Check that this is the beginning of a packet, and that the buffer is available.
* Else, drop data */
if ((len == 0) && (cc_tx == 0)) {
len = c;
cc_ptr = 0;
}
if ((len != 0) && (cc_ptr < RF_BUFF_LEN)) {
cc_tx_buff[cc_ptr++] = c;
if (cc_ptr > len) { /* Need one more than len for the tx length byte */
cc_tx = len + 1;
len = 0;
}
} else {
len = 0;
}
}
void send_on_rf(void)
{
uint8_t cc_tx_data[RF_BUFF_LEN + 2];
uint8_t tx_len = cc_tx;
int ret = 0;
/* Create a local copy */
memcpy((char*)&(cc_tx_data), (char*)cc_tx_buff, tx_len);
/* "Free" the buffer as soon as possible */
cc_tx = 0;
#ifdef DEBUG_BROADCAST
cc_tx_data[1] = 0; /* Broadcast */
#endif
/* Send */
if (cc1101_tx_fifo_state() != 0) {
cc1101_flush_tx_fifo();
}
ret = cc1101_send_packet(cc_tx_data, tx_len);
#ifdef DEBUG
uprintf(UART0, "Tx ret: %d\n", ret);
#endif
}
/***************************************************************************** */
int main(void)
{
system_init();
uart_on(UART0, 115200, handle_uart_cmd);
ssp_master_on(0, LPC_SSP_FRAME_SPI, 8, 4*1000*1000); /* bus_num, frame_type, data_width, rate */
status_led_config(&status_led_green, &status_led_red);
/* Radio */
rf_config();
while (1) {
uint8_t status = 0;
/* Tell we are alive :) */
chenillard(250);
/* RF */
if (cc_tx != 0) {
send_on_rf();
}
/* Do not leave radio in an unknown or unwated state */
do {
status = (cc1101_read_status() & CC1101_STATE_MASK);
} while (status == CC1101_STATE_TX);
if (status != CC1101_STATE_RX) {
static uint8_t loop = 0;
loop++;
if (loop > 10) {
if (cc1101_rx_fifo_state() != 0) {
cc1101_flush_rx_fifo();
}
#ifdef DEBUG
uprintf(UART0, "Back to Rx\n");
#endif
cc1101_enter_rx_mode();
loop = 0;
}
}
if (check_rx == 1) {
check_rx = 0;
handle_rf_rx_data();
}
}
return 0;
}