--- /dev/null
+/****************************************************************************
+ * 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;
+}
+
+
+
+
