diff options
Diffstat (limited to 'loragw_hal/src/loragw_hal.c')
| -rw-r--r-- | loragw_hal/src/loragw_hal.c | 974 |
1 files changed, 974 insertions, 0 deletions
diff --git a/loragw_hal/src/loragw_hal.c b/loragw_hal/src/loragw_hal.c new file mode 100644 index 0000000..bdf563c --- /dev/null +++ b/loragw_hal/src/loragw_hal.c @@ -0,0 +1,974 @@ +/* + / _____) _ | | +( (____ _____ ____ _| |_ _____ ____| |__ + \____ \| ___ | (_ _) ___ |/ ___) _ \ + _____) ) ____| | | || |_| ____( (___| | | | +(______/|_____)_|_|_| \__)_____)\____)_| |_| + ©2013 Semtech-Cycleo + +Description: + Lora gateway Hardware Abstraction Layer +*/ + + +/* -------------------------------------------------------------------------- */ +/* --- DEPENDANCIES --------------------------------------------------------- */ + +#include <stdint.h> /* C99 types */ +#include <stdlib.h> /* malloc & free */ +#include <stdbool.h> /* bool type */ +#include <stdio.h> /* printf fprintf */ +#include <math.h> /* NaN */ + +#include "loragw_reg.h" +#include "loragw_hal.h" +#include "loragw_aux.h" + +/* -------------------------------------------------------------------------- */ +/* --- PRIVATE MACROS ------------------------------------------------------- */ + +#define ARRAY_SIZE(a) (sizeof(a) / sizeof((a)[0])) +#ifdef DEBUG + #define DEBUG_MSG(str) fprintf(stderr, str) + #define DEBUG_PRINTF(fmt, args...) fprintf(stderr,"%s:%d: "fmt, __FUNCTION__, __LINE__, args) + #define DEBUG_ARRAY(a,b,c) for(a=0;a<b;++a) fprintf(stderr,"%x.",c[a]);fprintf(stderr,"end\n") + #define CHECK_NULL(a) if(a==NULL){fprintf(stderr,"%s:%d: ERROR: NULL POINTER AS ARGUMENT\n", __FUNCTION__, __LINE__);return LGW_HAL_ERROR;} +#else + #define DEBUG_MSG(str) + #define DEBUG_PRINTF(fmt, args...) + #define DEBUG_ARRAY(a,b,c) + #define CHECK_NULL(a) if(a==NULL){return LGW_HAL_ERROR;} +#endif + +#define IF_HZ_TO_REG(f) (f << 5)/15625 + +/* -------------------------------------------------------------------------- */ +/* --- PRIVATE CONSTANTS ---------------------------------------------------- */ + +#define MCU_ARB 0 +#define MCU_AGC 1 + +const uint8_t ifmod_config[LGW_IF_CHAIN_NB] = LGW_IFMODEM_CONFIG; /* define hardware capability */ + +const uint32_t rf_rx_lowfreq[LGW_RF_CHAIN_NB] = LGW_RF_RX_LOWFREQ; +const uint32_t rf_rx_upfreq[LGW_RF_CHAIN_NB] = LGW_RF_RX_UPFREQ; +const uint32_t rf_tx_lowfreq[LGW_RF_CHAIN_NB] = LGW_RF_TX_LOWFREQ; +const uint32_t rf_tx_upfreq[LGW_RF_CHAIN_NB] = LGW_RF_TX_UPFREQ; + +#define MCU_ARB_FW_BYTE 2048 /* size of the firmware IN BYTES (= twice the number of 14b words) */ +#define MCU_AGC_FW_BYTE 8192 /* size of the firmware IN BYTES (= twice the number of 14b words) */ + +#define SX1257_CLK_OUT 1 +#define SX1257_TX_DAC_CLK_SEL 1 /* 0:int, 1:ext */ +#define SX1257_TX_DAC_GAIN 2 /* 3:0, 2:-3, 1:-6, 0:-9 dBFS (default 2) */ +#define SX1257_TX_MIX_GAIN 14 /* -38 + 2*TxMixGain dB (default 14) */ +#define SX1257_TX_PLL_BW 3 /* 0:75, 1:150, 2:225, 3:300 kHz (default 3) */ +#define SX1257_TX_ANA_BW 0 /* 17.5 / 2*(41-TxAnaBw) MHz (default 0) */ +#define SX1257_TX_DAC_BW 7 /* 24 + 8*TxDacBw Nb FIR taps (default 2) */ +#define SX1257_RX_LNA_GAIN 1 /* 1 to 6, 1 highest gain */ +#define SX1257_RX_BB_GAIN 12 /* 0 to 15 , 15 highest gain */ +#define SX1257_RX_ADC_BW 7 /* 0 to 7, 2:100<BW<200, 5:200<BW<400,7:400<BW (kHz) */ +#define SX1257_RX_ADC_TRIM 7 /* 0 to 7, 6 for 32MHz ref, 5 for 36MHz ref */ +#define SX1257_RXBB_BW 2 + +#define RSSI_OFFSET_LORA_MULTI -100.0 // TODO +#define RSSI_OFFSET_LORA_STD -100.0 // TODO + +#define TX_METADATA_NB 16 +#define RX_METADATA_NB 16 + +#define MIN_LORA_PREAMBLE 4 + +/* -------------------------------------------------------------------------- */ +/* --- PRIVATE VARIABLES ---------------------------------------------------- */ + +#include "arb_fw.var" /* external definition of the variable */ +#include "agc_fw.var" /* external definition of the variable */ + +/* +The following static variables are the configuration set that the user can +modify using rxrf_setconf and rxif_setconf functions. +The function _start then use that set to configure the hardware. + +Parameters validity and coherency is verified by the _setconf functions and +the _start function assumes +*/ + +static bool lgw_is_started = false; + +static bool rf_enable[LGW_RF_CHAIN_NB] = {0, 0}; +static uint32_t rf_rx_freq[LGW_IF_CHAIN_NB] = {0, 0}; /* absolute, in Hz */ + +static uint8_t if_rf_switch = 0x00; /* each IF from 0 to 7 has 1 bit associated to it, 0 -> radio A, 1 -> radio B */ +/* IF 8 and 9 are on radio A */ + +static bool if_enable[LGW_IF_CHAIN_NB] = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0}; +static int32_t if_freq[LGW_IF_CHAIN_NB] = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0}; /* relative to radio frequency, +/- in Hz */ + +static uint8_t lora_multi_sfmask[LGW_MULTI_NB] = {0, 0, 0, 0}; /* enables SF for Lora 'multi' modems */ +static uint8_t lora_rx_bw = 0; /* for the Lora standalone modem(s) */ +static uint16_t lora_rx_sf = 0; /* for the Lora standalone modem(s) */ +static uint8_t fsk_rx_bw = 0; /* for the FSK standalone modem(s) */ +static uint8_t fsk_rx_sf = 0; /* for the FSK standalone modem(s) */ + +/* -------------------------------------------------------------------------- */ +/* --- PRIVATE FUNCTIONS DECLARATION ---------------------------------------- */ + +int load_firmware(uint8_t target, uint8_t *firmware, uint16_t size); + +void sx125x_write(uint8_t rf_chain, uint8_t addr, uint8_t data); + +uint8_t sx125x_read(uint8_t rf_chain, uint8_t addr); + +void setup_sx1257(uint8_t rf_chain, uint32_t freq_hz); + +void lgw_constant_adjust(void); + +/* -------------------------------------------------------------------------- */ +/* --- PRIVATE FUNCTIONS DEFINITION ----------------------------------------- */ + +/* size is the firmware size in bytes (not 14b words) */ +int load_firmware(uint8_t target, uint8_t *firmware, uint16_t size) { + int i; + int32_t read_value; + int reg_rst; + int reg_sel; + + /* check parameters */ + CHECK_NULL(firmware); + if (target == MCU_ARB) { + if (size != MCU_ARB_FW_BYTE) { + DEBUG_MSG("ERROR: NOT A VALID SIZE FOR MCU ARG FIRMWARE\n"); + return -1; + } + reg_rst = LGW_MCU_RST_0; + reg_sel = LGW_MCU_SELECT_MUX_0; + }else if (target == MCU_AGC) { + if (size != MCU_AGC_FW_BYTE) { + DEBUG_MSG("ERROR: NOT A VALID SIZE FOR MCU AGC FIRMWARE\n"); + return -1; + } + reg_rst = LGW_MCU_RST_1; + reg_sel = LGW_MCU_SELECT_MUX_1; + } else { + DEBUG_MSG("ERROR: NOT A VALID TARGET FOR LOADING FIRMWARE\n"); + return -1; + } + + /* reset the targeted MCU */ + lgw_reg_w(reg_rst, 1); + + /* set mux to access MCU program RAM and set address to 0 */ + lgw_reg_w(reg_sel, 0); + lgw_reg_w(LGW_MCU_PROM_ADDR, 0); + + /* write the program in one burst */ + lgw_reg_wb(LGW_MCU_PROM_DATA, firmware, size); + + /* give back control of the MCU program ram to the MCU */ + lgw_reg_w(reg_sel, 1); + + return 0; +} + +/* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ */ + +void sx125x_write(uint8_t channel, uint8_t addr, uint8_t data) { + int reg_add, reg_dat, reg_cs; + + /* checking input parameters */ + if (channel >= LGW_RF_CHAIN_NB) { + DEBUG_MSG("ERROR: INVALID RF_CHAIN\n"); + return; + } + if (addr >= 0x7F) { + DEBUG_MSG("ERROR: ADDRESS OUT OF RANGE\n"); + return; + } + + /* selecting the target radio */ + switch (channel) { + case 0: + reg_add = LGW_SPI_RADIO_A__ADDR; + reg_dat = LGW_SPI_RADIO_A__DATA; + reg_cs = LGW_SPI_RADIO_A__CS; + break; + + case 1: + reg_add = LGW_SPI_RADIO_B__ADDR; + reg_dat = LGW_SPI_RADIO_B__DATA; + reg_cs = LGW_SPI_RADIO_B__CS; + break; + + default: + DEBUG_PRINTF("ERROR: UNEXPECTED VALUE %d IN SWITCH STATEMENT\n", channel); + return; + } + + /* SPI master data write procedure */ + lgw_reg_w(reg_add, 0x80 | addr); /* MSB at 1 for write operation */ + lgw_reg_w(reg_dat, data); + lgw_reg_w(reg_cs, 1); + lgw_reg_w(reg_cs, 0); + + return; +} + +/* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ */ + +uint8_t sx125x_read(uint8_t channel, uint8_t addr) { + int reg_add, reg_dat, reg_cs, reg_rb; + int32_t read_value; + + /* checking input parameters */ + if (channel >= LGW_RF_CHAIN_NB) { + DEBUG_MSG("ERROR: INVALID RF_CHAIN\n"); + return 0; + } + if (addr >= 0x7F) { + DEBUG_MSG("ERROR: ADDRESS OUT OF RANGE\n"); + return 0; + } + + /* selecting the target radio */ + switch (channel) { + case 0: + reg_add = LGW_SPI_RADIO_A__ADDR; + reg_dat = LGW_SPI_RADIO_A__DATA; + reg_cs = LGW_SPI_RADIO_A__CS; + reg_rb = LGW_SPI_RADIO_A__DATA_READBACK; + break; + + case 1: + reg_add = LGW_SPI_RADIO_B__ADDR; + reg_dat = LGW_SPI_RADIO_B__DATA; + reg_cs = LGW_SPI_RADIO_B__CS; + reg_rb = LGW_SPI_RADIO_B__DATA_READBACK; + break; + + default: + DEBUG_PRINTF("ERROR: UNEXPECTED VALUE %d IN SWITCH STATEMENT\n", channel); + return 0; + } + + /* SPI master data read procedure */ + lgw_reg_w(reg_add, addr); /* MSB at 0 for read operation */ + lgw_reg_w(reg_dat, 0); + lgw_reg_w(reg_cs, 1); + lgw_reg_w(reg_cs, 0); + lgw_reg_r(reg_rb, &read_value); + + return (uint8_t)read_value; +} + +/* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ */ + +void setup_sx1257(uint8_t rf_chain, uint32_t freq_hz) { + uint32_t part_int; + uint32_t part_frac; + int i = 0; + + if (rf_chain >= LGW_RF_CHAIN_NB) { + DEBUG_MSG("ERROR: INVALID RF_CHAIN\n"); + return; + } + + /* misc */ + sx125x_write(rf_chain, 0x10, SX1257_TX_DAC_CLK_SEL + SX1257_CLK_OUT*2); + + /* Tx gain and trim */ + sx125x_write(rf_chain, 0x08, SX1257_TX_MIX_GAIN + SX1257_TX_DAC_GAIN*16); + sx125x_write(rf_chain, 0x0A, SX1257_TX_ANA_BW + SX1257_TX_PLL_BW*32); + sx125x_write(rf_chain, 0x0B, SX1257_TX_DAC_BW); + + /* Rx gain and trim */ + sx125x_write(rf_chain, 0x0C, 0 + SX1257_RX_BB_GAIN*2 + SX1257_RX_LNA_GAIN*32); + sx125x_write(rf_chain, 0x0D, SX1257_RXBB_BW + SX1257_RX_ADC_TRIM*4 + SX1257_RX_ADC_BW*32); + + /* set RX PLL frequency */ + part_int = freq_hz / LGW_SW1257_DENUM; /* integer part, gives the MSB and the middle byte */ + part_frac = ((freq_hz % LGW_SW1257_DENUM) << 8) / LGW_SW1257_DENUM; /* fractional part, gives LSB */ + sx125x_write(rf_chain, 0x01,0xFF & (part_int >> 8)); /* Most Significant Byte */ + sx125x_write(rf_chain, 0x02,0xFF & part_int); /* middle byte */ + sx125x_write(rf_chain, 0x03,0xFF & part_frac); /* Least Significant Byte */ + + /* start and PLL lock */ + do { + sx125x_write(rf_chain, 0x00, 1); /* enable Xtal oscillator */ + sx125x_write(rf_chain, 0x00, 3); /* Enable RX (PLL+FE) */ + ++i; + DEBUG_PRINTF("Note: SX1257 #%d PLL start (attempt %d)\n", rf_chain, i); + wait_ms(1); + } while(sx125x_read(rf_chain, 0x11) & 0x02 == 0); + + return; +} + +/* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ */ + +void lgw_constant_adjust(void) { + + /* I/Q path setup */ + // lgw_reg_w(LGW_RX_INVERT_IQ,0); /* default 0 */ + // lgw_reg_w(LGW_MODEM_INVERT_IQ,1); /* default 1 */ + // lgw_reg_w(LGW_CHIRP_INVERT_RX,1); /* default 1 */ + // lgw_reg_w(LGW_RX_EDGE_SELECT,0); /* default 0 */ + // lgw_reg_w(LGW_MBWSSF_MODEM_INVERT_IQ,0); /* default 0 */ + lgw_reg_w(LGW_DC_NOTCH_EN,1); /* default 0 */ + // lgw_reg_w(LGW_RSSI_BB_FILTER_ALPHA,7); /* default 7 */ + lgw_reg_w(LGW_RSSI_DEC_FILTER_ALPHA,7); /* default 5 */ + lgw_reg_w(LGW_RSSI_CHANN_FILTER_ALPHA,7); /* default 8 */ + // lgw_reg_w(LGW_RSSI_BB_DEFAULT_VALUE,32); /* default 32 */ + lgw_reg_w(LGW_RSSI_CHANN_DEFAULT_VALUE,90); /* default 100 */ + lgw_reg_w(LGW_RSSI_DEC_DEFAULT_VALUE,90); /* default 100 */ + + /* Correlator setup */ + // lgw_reg_w(LGW_CORR_DETECT_EN,126); /* default 126 */ + // lgw_reg_w(LGW_CORR_NUM_SAME_PEAK,4); /* default 4 */ + // lgw_reg_w(LGW_CORR_MAC_GAIN,5); /* default 5 */ + // lgw_reg_w(LGW_CORR_SAME_PEAKS_OPTION_SF6,0); /* default 0 */ + // lgw_reg_w(LGW_CORR_SAME_PEAKS_OPTION_SF7,1); /* default 1 */ + // lgw_reg_w(LGW_CORR_SAME_PEAKS_OPTION_SF8,1); /* default 1 */ + // lgw_reg_w(LGW_CORR_SAME_PEAKS_OPTION_SF9,1); /* default 1 */ + // lgw_reg_w(LGW_CORR_SAME_PEAKS_OPTION_SF10,1); /* default 1 */ + // lgw_reg_w(LGW_CORR_SAME_PEAKS_OPTION_SF11,1); /* default 1 */ + // lgw_reg_w(LGW_CORR_SAME_PEAKS_OPTION_SF12,1); /* default 1 */ + // lgw_reg_w(LGW_CORR_SIG_NOISE_RATIO_SF6,4); /* default 4 */ + // lgw_reg_w(LGW_CORR_SIG_NOISE_RATIO_SF7,4); /* default 4 */ + // lgw_reg_w(LGW_CORR_SIG_NOISE_RATIO_SF8,4); /* default 4 */ + // lgw_reg_w(LGW_CORR_SIG_NOISE_RATIO_SF9,4); /* default 4 */ + // lgw_reg_w(LGW_CORR_SIG_NOISE_RATIO_SF10,4); /* default 4 */ + // lgw_reg_w(LGW_CORR_SIG_NOISE_RATIO_SF11,4); /* default 4 */ + // lgw_reg_w(LGW_CORR_SIG_NOISE_RATIO_SF12,4); /* default 4 */ + + /* Lora 'multi' modems setup */ + lgw_reg_w(LGW_PREAMBLE_SYMB1_NB,4); /* default 10 */ + // lgw_reg_w(LGW_FREQ_TO_TIME_DRIFT,9); /* default 9 */ + // lgw_reg_w(LGW_FREQ_TO_TIME_INVERT,29); /* default 29 */ + // lgw_reg_w(LGW_FRAME_SYNCH_GAIN,1); /* default 1 */ + // lgw_reg_w(LGW_SYNCH_DETECT_TH,1); /* default 1 */ + // lgw_reg_w(LGW_ZERO_PAD,0); /* default 0 */ + lgw_reg_w(LGW_SNR_AVG_CST,3); /* default 2 */ + // lgw_reg_w(LGW_PPM_OFFSET,0); /* default 0 */ + // lgw_reg_w(LGW_FRAME_SYNCH_PEAK1_POS,1); /* default 1 */ + // lgw_reg_w(LGW_FRAME_SYNCH_PEAK2_POS,2); /* default 2 */ + // lgw_reg_w(LGW_PREAMBLE_FINE_TIMING_GAIN,1); /* default 1 */ + // lgw_reg_w(LGW_ONLY_CRC_EN,1); /* default 1 */ + // lgw_reg_w(LGW_PAYLOAD_FINE_TIMING_GAIN,2); /* default 2 */ + // lgw_reg_w(LGW_TRACKING_INTEGRAL,0); /* default 0 */ + // lgw_reg_w(LGW_ADJUST_MODEM_START_OFFSET_RDX8,0); /* default 0 */ + // lgw_reg_w(LGW_ADJUST_MODEM_START_OFFSET_RDX4,0); /* default 0 */ + // lgw_reg_w(LGW_ADJUST_MODEM_START_OFFSET_SF12_RDX4,4092); /* default 4092 */ + // lgw_reg_w(LGW_MAX_PAYLOAD_LEN,255); /* default 255 */ + + /* MBWSSF Modem */ + // lgw_reg_w(LGW_MBWSSF_MODEM_ENABLE,1); /* default 0 */ + // lgw_reg_w(LGW_MBWSSF_PREAMBLE_SYMB1_NB,10); /* default 10 */ + // lgw_reg_w(LGW_MBWSSF_FREQ_TO_TIME_DRIFT,36); /* default 36 */ + // lgw_reg_w(LGW_MBWSSF_FREQ_TO_TIME_INVERT,29); /* default 29 */ + // lgw_reg_w(LGW_MBWSSF_FRAME_SYNCH_GAIN,1); /* default 1 */ + // lgw_reg_w(LGW_MBWSSF_SYNCH_DETECT_TH,1); /* default 1 */ + // lgw_reg_w(LGW_MBWSSF_ZERO_PAD,0); /* default 0 */ + // lgw_reg_w(LGW_MBWSSF_PPM_OFFSET,0); /* default 0 */ + // lgw_reg_w(LGW_MBWSSF_FRAME_SYNCH_PEAK1_POS,1); /* default 1 */ + // lgw_reg_w(LGW_MBWSSF_FRAME_SYNCH_PEAK2_POS,2); /* default 2 */ + // lgw_reg_w(LGW_MBWSSF_ONLY_CRC_EN,1); /* default 1 */ + // lgw_reg_w(LGW_MBWSSF_PAYLOAD_FINE_TIMING_GAIN,2); /* default 2 */ + // lgw_reg_w(LGW_MBWSSF_PREAMBLE_FINE_TIMING_GAIN,1); /* default 1 */ + // lgw_reg_w(LGW_MBWSSF_TRACKING_INTEGRAL,0); /* default 0 */ + // lgw_reg_w(LGW_MBWSSF_AGC_FREEZE_ON_DETECT,1); /* default 1 */ + + /* TX */ + // lgw_reg_w(LGW_TX_MODE,0); /* default 0 */ + lgw_reg_w(LGW_TX_START_DELAY,5000); /* default 0 */ + + return; +} + +/* -------------------------------------------------------------------------- */ +/* --- PUBLIC FUNCTIONS DEFINITION ------------------------------------------ */ + +int lgw_rxrf_setconf(uint8_t rf_chain, struct lgw_conf_rxrf_s conf) { + + /* check if the gateway is running */ + if (lgw_is_started == true) { + DEBUG_MSG("ERROR: GATEWAY IS RUNNING, STOP IT BEFORE TOUCHING CONFIGURATION\n"); + return LGW_HAL_ERROR; + } + + /* check input parameters */ + if (rf_chain > LGW_RF_CHAIN_NB) { + DEBUG_MSG("ERROR: NOT A VALID RF_CHAIN NUMBER\n"); + return LGW_HAL_ERROR; + } + if (conf.freq_hz > rf_rx_upfreq[rf_chain]) { + DEBUG_MSG("ERROR: FREQUENCY TOO HIGH FOR THAT RF_CHAIN\n"); + return LGW_HAL_ERROR; + } else if (conf.freq_hz < rf_rx_lowfreq[rf_chain]) { + DEBUG_MSG("ERROR: FREQUENCY TOO LOW FOR THAT RF_CHAIN\n"); + return LGW_HAL_ERROR; + } + + /* set internal config according to parameters */ + rf_enable[rf_chain] = conf.enable; + rf_rx_freq[rf_chain] = conf.freq_hz; + + return LGW_HAL_SUCCESS; +} + +/* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ */ + +int lgw_rxif_setconf(uint8_t if_chain, struct lgw_conf_rxif_s conf) { + int i, j; /* tmp variables, to shorten long 'if' lines */ + + /* check if the gateway is running */ + if (lgw_is_started == true) { + DEBUG_MSG("ERROR: GATEWAY IS RUNNING, STOP IT BEFORE TOUCHING CONFIGURATION\n"); + return LGW_HAL_ERROR; + } + + /* if chain is disabled, don't care about most parameters */ + if (conf.enable == false) { + if_enable[if_chain] = false; + if_freq[if_chain] = 0; + DEBUG_PRINTF("Note: if_chain %d disabled\n", if_chain); + return LGW_HAL_SUCCESS; + } + + /* check 'general' parameters */ + /* ? add checks to stay in band (ie. radio_freq+if+BW/2 < fmax) ? */ + if (if_chain > LGW_IF_CHAIN_NB) { + DEBUG_PRINTF("ERROR: %d NOT A VALID IF_CHAIN NUMBER\n", if_chain); + return LGW_HAL_ERROR; + } + if (ifmod_config[if_chain] == IF_UNDEFINED) { + DEBUG_PRINTF("ERROR: IF CHAIN %d NOT CONFIGURABLE\n", if_chain); + } + if (conf.freq_hz > LGW_RF_BANDWIDTH/2) { + DEBUG_PRINTF("ERROR: IF FREQUENCY %d TOO HIGH\n", conf.freq_hz); + return LGW_HAL_ERROR; + } else if (conf.freq_hz < -LGW_RF_BANDWIDTH/2) { + DEBUG_PRINTF("ERROR: IF FREQUENCY %d TOO LOW\n", conf.freq_hz); + return LGW_HAL_ERROR; + } + + /* check parameters according to the type of IF chain + modem, + fill default if necessary, and commit configuration if everything is OK */ + switch (ifmod_config[if_chain]) { + case IF_LORA_STD: + if (conf.rf_chain != 0) { + DEBUG_MSG("ERROR: LORA_STD IF CHAIN CAN ONLY BE ASSOCIATED TO RF_CHAIN 0\n"); + return LGW_HAL_ERROR; + } + /* fill default parameters if needed */ + i = (conf.bandwidth == 0) ? BW_250KHZ : conf.bandwidth; + j = (conf.datarate == 0) ? DR_LORA_SF9 : conf.datarate; + /* check BW & DR */ + if ((i != BW_125KHZ) && (i != BW_250KHZ) && (i != BW_500KHZ)) { + DEBUG_MSG("ERROR: BANDWIDTH NOT SUPPORTED BY LORA_STD IF CHAIN\n"); + return LGW_HAL_ERROR; + } + if ((j!=DR_LORA_SF7)&&(j!=DR_LORA_SF8)&&(j!=DR_LORA_SF9)&&(j!=DR_LORA_SF10)&&(j!=DR_LORA_SF11)&&(j!=DR_LORA_SF12)) { + DEBUG_MSG("ERROR: DATARATE NOT SUPPORTED BY LORA_STD IF CHAIN\n"); + return LGW_HAL_ERROR; + } + /* set internal configuration */ + if_enable[if_chain] = conf.enable; + if_freq[if_chain] = conf.freq_hz; + lora_rx_bw = i; + lora_rx_sf = j; + DEBUG_PRINTF("Note: Lora 'std' if_chain %d configured; en:%d freq:%d bw:%d dr:%d\n", if_chain, if_enable[if_chain], if_freq[if_chain], lora_rx_bw, lora_rx_sf); + break; + + case IF_LORA_MULTI: + if (conf.rf_chain >= LGW_RF_CHAIN_NB) { + DEBUG_MSG("ERROR: INVALID RF_CHAIN TO ASSOCIATE WITH A LORA_STD IF CHAIN\n"); + return LGW_HAL_ERROR; + } + /* fill default parameters if needed */ + i = (conf.bandwidth == 0) ? BW_125KHZ : conf.bandwidth; + j = (conf.datarate == 0) ? DR_LORA_MULTI : conf.datarate; + /* check BW & DR */ + if (i != BW_125KHZ) { + DEBUG_MSG("ERROR: BANDWIDTH NOT SUPPORTED BY LORA_MULTI IF CHAIN\n"); + return LGW_HAL_ERROR; + } + if ((j & DR_LORA_MULTI) == 0) { /* supports any combination of SF between 7 and 12 */ + DEBUG_MSG("ERROR: DATARATE(S) NOT SUPPORTED BY LORA_MULTI IF CHAIN\n"); + return LGW_HAL_ERROR; + } + /* set internal configuration */ + if_enable[if_chain] = conf.enable; + switch (conf.rf_chain) { + case 0: if_rf_switch &= ~((uint8_t)1 << if_chain); break; /* force a 0 at the if_chain-th position */ + case 1: if_rf_switch |= ((uint8_t)1 << if_chain); break; /* force a 1 at the if_chain-th position */ + default: DEBUG_MSG("ERROR: IMPROPRER IF_CHAIN/RF_CHAIN ASSOCIATION\n"); + } + if_freq[if_chain] = conf.freq_hz; + lora_multi_sfmask[if_chain] = (uint8_t)j; + DEBUG_PRINTF("Note: Lora 'multi' if_chain %d configured; en:%d freq:%d SF_mask:0x%02x\n", if_chain, if_enable[if_chain], if_freq[if_chain], lora_multi_sfmask[if_chain]); + DEBUG_PRINTF("Note: rf/if switch state 0x%02x\n", if_rf_switch); + break; + + // case IF_FSK_STD: + // TODO + + default: + DEBUG_PRINTF("ERROR: IF CHAIN %d TYPE NOT SUPPORTED\n", if_chain); + return LGW_HAL_ERROR; + } + + return LGW_HAL_SUCCESS; +} + +/* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ */ + +int lgw_start(void) { + int reg_stat; + int32_t read_value; + int i, j; + + if (lgw_is_started == true) { + DEBUG_MSG("Note: Lora Gateway already started, restarting it now\n"); + } + + reg_stat = lgw_connect(); + if (reg_stat == LGW_REG_ERROR) { + DEBUG_MSG("ERROR: FAIL TO CONNECT BOARD\n"); + return LGW_HAL_ERROR; + } + + /* reset the registers (also shuts the radios down) */ + lgw_soft_reset(); + + /* Ungate clock (gated by default), needed for SPI master to SX1257 */ + lgw_reg_w(LGW_CLK32M_EN, 1); + lgw_reg_w(LGW_CLKHS_EN, 1); + + /* switch on and reset the radios (also starts the 32 MHz XTAL) */ + lgw_reg_w(LGW_RADIO_A_EN,1); /* radio A *must* be started to get 32 MHz clk */ + lgw_reg_w(LGW_RADIO_B_EN,1); /* radio B *must* be started because ?????? */ + wait_ms(500); + lgw_reg_w(LGW_RADIO_RST,1); + wait_ms(5); + lgw_reg_w(LGW_RADIO_RST,0); + + /* setup the radios */ + if (rf_enable[0] == 1) { + setup_sx1257(0, rf_rx_freq[0]); + } + if (rf_enable[1] == 1) { + setup_sx1257(1, rf_rx_freq[1]); + } + + /* gives the AGC MCU control over radio, RF front-end and filter gain */ + lgw_reg_w(LGW_FORCE_HOST_RADIO_CTRL,0); + lgw_reg_w(LGW_FORCE_HOST_FE_CTRL,0); + lgw_reg_w(LGW_FORCE_DEC_FILTER_GAIN,0); + + // /* TODO load the calibration firmware and wait for calibration to end */ + // load_firmware(MCU_AGC, cal_firmware, ARRAY_SIZE(cal_firmware)); + // lgw_reg_w(LGW_MCU_RST, 0); /* start the AGC MCU */ + // lgw_reg_w(LGW_FORCE_HOST_REG_CTRL,0); /* let the AGC MCU control the registers */ + // do { + // lgw_reg_r(LGW_VERSION, &read_value); + // } while (read_value == 0); + // lgw_reg_w(LGW_MCU_RST, 3); /* reset all MCU */ + + /* in the absence of calibration firmware, do a "manual" calibration */ + lgw_reg_w(LGW_TX_OFFSET_I,10); + lgw_reg_w(LGW_TX_OFFSET_Q,5); + lgw_reg_w(LGW_IQ_MISMATCH_A_AMP_COEFF,63); + lgw_reg_w(LGW_IQ_MISMATCH_A_PHI_COEFF,9); + lgw_reg_w(LGW_IQ_MISMATCH_B_AMP_COEFF,0); + lgw_reg_w(LGW_IQ_MISMATCH_B_PHI_COEFF,0); + + /* load adjusted parameters */ + lgw_constant_adjust(); + // lgw_reg_w(LGW_PPM_OFFSET,0); /* default 0 */ + + /* configure Lora 'multi' (aka. Lora 'sensor' channels */ + lgw_reg_w(LGW_RADIO_SELECT, if_rf_switch); /* IF mapping to radio A/B (per bit, 0=A, 1=B) */ + + lgw_reg_w(LGW_IF_FREQ_0, IF_HZ_TO_REG(if_freq[0])); /* default -384 */ + lgw_reg_w(LGW_IF_FREQ_1, IF_HZ_TO_REG(if_freq[1])); /* default -128 */ + lgw_reg_w(LGW_IF_FREQ_2, IF_HZ_TO_REG(if_freq[2])); /* default 128 */ + lgw_reg_w(LGW_IF_FREQ_3, IF_HZ_TO_REG(if_freq[3])); /* default 384 */ + + lgw_reg_w(LGW_CORR0_DETECT_EN, (if_enable[0] == true) ? lora_multi_sfmask[0] : 0); /* default 0 */ + lgw_reg_w(LGW_CORR1_DETECT_EN, (if_enable[1] == true) ? lora_multi_sfmask[1] : 0); /* default 0 */ + lgw_reg_w(LGW_CORR2_DETECT_EN, (if_enable[2] == true) ? lora_multi_sfmask[2] : 0); /* default 0 */ + lgw_reg_w(LGW_CORR3_DETECT_EN, (if_enable[3] == true) ? lora_multi_sfmask[3] : 0); /* default 0 */ + + lgw_reg_w(LGW_PPM_OFFSET, 0x00); /* if the threshold is 16ms, use 0x60 to enable ppm_offset for SF12 and SF11 */ + + lgw_reg_w(LGW_CONCENTRATOR_MODEM_ENABLE,1); /* default 0 */ + + /* configure Lora 'stand-alone' modem */ + lgw_reg_w(LGW_IF_FREQ_8, IF_HZ_TO_REG(if_freq[8])); /* MBWSSF modem (default 0) */ + if (if_enable[8] == true) { + switch(lora_rx_bw) { + case BW_125KHZ: lgw_reg_w(LGW_MBWSSF_MODEM_BW,0); break; + case BW_250KHZ: lgw_reg_w(LGW_MBWSSF_MODEM_BW,1); break; + case BW_500KHZ: lgw_reg_w(LGW_MBWSSF_MODEM_BW,2); break; + default: DEBUG_PRINTF("ERROR: UNEXPECTED VALUE %d IN SWITCH STATEMENT\n", lora_rx_bw); + } + switch(lora_rx_sf) { + case DR_LORA_SF7: lgw_reg_w(LGW_MBWSSF_RATE_SF,7); break; + case DR_LORA_SF8: lgw_reg_w(LGW_MBWSSF_RATE_SF,8); break; + case DR_LORA_SF9: lgw_reg_w(LGW_MBWSSF_RATE_SF,9); break; + case DR_LORA_SF10: lgw_reg_w(LGW_MBWSSF_RATE_SF,10); break; + case DR_LORA_SF11: lgw_reg_w(LGW_MBWSSF_RATE_SF,11); break; + case DR_LORA_SF12: lgw_reg_w(LGW_MBWSSF_RATE_SF,12); break; + default: DEBUG_PRINTF("ERROR: UNEXPECTED VALUE %d IN SWITCH STATEMENT\n", lora_rx_sf); + } + lgw_reg_w(LGW_MBWSSF_PPM_OFFSET,0); /* default 0 */ + lgw_reg_w(LGW_MBWSSF_MODEM_ENABLE, 1); /* default 0 */ + } else { + lgw_reg_w(LGW_MBWSSF_MODEM_ENABLE, 0); + } + + /* configure FSK modem */ + //lgw_reg_w(LGW_IF_FREQ_9, IF_HZ_TO_REG(if_freq[9])); /* FSK modem (default 0) */ + + /* Load firmware */ + load_firmware(MCU_ARB, arb_firmware, MCU_ARB_FW_BYTE); + load_firmware(MCU_AGC, agc_firmware, MCU_AGC_FW_BYTE); + + /* Get MCUs out of reset */ + lgw_reg_w(LGW_MCU_RST_0, 0); + lgw_reg_w(LGW_MCU_RST_1, 0); + + /* Show that nanoC is configured (LED 602 green, blue at reset)*/ + lgw_reg_w(LGW_LED_REG, 5); + + lgw_is_started = true; + return LGW_HAL_SUCCESS; +} + +/* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ */ + +int lgw_stop(void) { + lgw_soft_reset(); + lgw_disconnect(); + + lgw_is_started = false; + return LGW_HAL_SUCCESS; +} + +/* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ */ + +int lgw_receive(uint8_t max_pkt, struct lgw_pkt_rx_s *pkt_data) { + int nb_pkt_fetch; /* loop variable and return value */ + struct lgw_pkt_rx_s *p; /* pointer to the current structure in the struct array */ + uint8_t buff[255+RX_METADATA_NB]; /* buffer to store the result of SPI read bursts */ + uint16_t data_addr; /* address read from the FIFO and programmed before the data buffer read operation */ + int s; /* size of the payload, uses to address metadata */ + int ifmod; /* type of if_chain/modem a packet was received by */ + int stat_fifo; /* the packet status as indicated in the FIFO */ + int j; + + /* check if the gateway is running */ + if (lgw_is_started == false) { + DEBUG_MSG("ERROR: GATEWAY IS NOT RUNNING, START IT BEFORE RECEIVING\n"); + return LGW_HAL_ERROR; + } + + /* check input variables */ + if (max_pkt <= 0) { + DEBUG_PRINTF("ERROR: %d = INVALID MAX NUMBER OF PACKETS TO FETCH\n", max_pkt); + return LGW_HAL_ERROR; + } + CHECK_NULL(pkt_data); + + /* iterate max_pkt times at most */ + for (nb_pkt_fetch = 0; nb_pkt_fetch < max_pkt; ++nb_pkt_fetch) { + + /* point to the proper struct in the struct array */ + p = &pkt_data[nb_pkt_fetch]; + + /* fetch all the RX FIFO data */ + lgw_reg_rb(LGW_RX_PACKET_DATA_FIFO_NUM_STORED, buff, 5); + + /* how many packets are in the RX buffer ? Break if zero */ + if (buff[0] == 0) { + DEBUG_MSG("Note: RX packet buffer empty, receive function returning nothing\n"); + break; /* no more packets to fetch, exit out of FOR loop */ + } + + DEBUG_PRINTF("FIFO content: %x %x %x %x %x\n",buff[0],buff[1],buff[2],buff[3],buff[4]); + + p->size = buff[4]; + s = p->size; + stat_fifo = buff[3]; /* will be used later, need to save it before overwriting buff */ + + /* STILL required */ + data_addr = (uint16_t)buff[1] + ((uint16_t)buff[2] << 8); + lgw_reg_w(LGW_RX_DATA_BUF_ADDR, data_addr); + + /* dynamically allocate memory to store payload */ + p->payload = (uint8_t *)malloc(s); + if (p->payload == NULL) { + /* not enough memory to allocate for payload, abort with error */ + DEBUG_MSG("ERROR: IMPOSSIBLE TO ALLOCATE MEMORY TO FETCH PAYLOAD\n"); + return LGW_HAL_ERROR; + } + + /* get payload + metadata */ + lgw_reg_rb(LGW_RX_DATA_BUF_DATA, buff, s+RX_METADATA_NB); + + /* copy payload */ + for (j = 0; j < s; ++j) { + p->payload[j] = buff[j]; + } + + /* process metadata */ + p->if_chain = buff[s+0]; + ifmod = ifmod_config[p->if_chain]; + DEBUG_PRINTF("[%d %d]\n", p->if_chain, ifmod); + + if ((ifmod == IF_LORA_MULTI) || (ifmod == IF_LORA_STD)) { + DEBUG_MSG("Note: Lora packet\n"); + if ((buff[s+1] & 0x01) == 1) { /* CRC enabled */ + if (stat_fifo == 1) { + p->status = STAT_CRC_OK; + } else if (stat_fifo == 3){ + p->status = STAT_CRC_BAD; + } else { + p->status = STAT_UNDEFINED; + } + } else { + p->status = STAT_NO_CRC; + } + p->modulation = MOD_LORA; + p->snr = ((double)((int8_t)buff[s+2]))/4; + p->snr_min = ((double)((int8_t)buff[s+3]))/4; + p->snr_max = ((double)((int8_t)buff[s+4]))/4; + if (ifmod == IF_LORA_MULTI) { + p->rssi = RSSI_OFFSET_LORA_MULTI + (double)buff[s+5]; //TODO: check formula + p->bandwidth = BW_125KHZ; /* fixed in hardware */ + } else { + p->rssi = RSSI_OFFSET_LORA_STD + (double)buff[s+5]; //TODO: check formula, might depend on bandwidth + p->bandwidth = BW_UNDEFINED; // TODO: get parameter from config + } + switch ((buff[s+1] >> 4) & 0x0F) { + case 7: p->datarate = DR_LORA_SF7; break; + case 8: p->datarate = DR_LORA_SF8; break; + case 9: p->datarate = DR_LORA_SF9; break; + case 10: p->datarate = DR_LORA_SF10; break; + case 11: p->datarate = DR_LORA_SF11; break; + case 12: p->datarate = DR_LORA_SF12; break; + default: p->datarate = DR_UNDEFINED; + } + switch ((buff[s+1] >> 1) & 0x07) { + case 1: p->coderate = CR_LORA_4_5; break; + case 2: p->coderate = CR_LORA_4_6; break; + case 3: p->coderate = CR_LORA_4_7; break; + case 4: p->coderate = CR_LORA_4_8; break; + default: p->coderate = CR_UNDEFINED; + } + } else if (ifmod == IF_FSK_STD) { + DEBUG_MSG("Note: FSK packet\n"); + p->status = STAT_UNDEFINED; // TODO + p->modulation = MOD_FSK; + p->rssi = NAN; // TODO + p->snr = NAN; + p->snr_min = NAN; + p->snr_max = NAN; + p->bandwidth = BW_UNDEFINED; // TODO + p->datarate = DR_UNDEFINED; // TODO + p->coderate = CR_UNDEFINED; // TODO + } else { + DEBUG_MSG("ERROR: UNEXPECTED PACKET ORIGIN\n"); + p->status = STAT_UNDEFINED; + p->modulation = MOD_UNDEFINED; + p->rssi = NAN; + p->snr = NAN; + p->snr_min = NAN; + p->snr_max = NAN; + p->bandwidth = BW_UNDEFINED; + p->datarate = DR_UNDEFINED; + p->coderate = CR_UNDEFINED; + } + + p->count_us = (uint32_t)buff[s+6] + ((uint32_t)buff[s+7] << 8) + ((uint32_t)buff[s+8] << 16) + ((uint32_t)buff[s+9] << 24); + p->crc = (uint16_t)buff[s+10] + ((uint16_t)buff[s+11] << 8); + + /* advance packet FIFO */ + lgw_reg_w(LGW_RX_PACKET_DATA_FIFO_NUM_STORED, 0); + } + + return nb_pkt_fetch; +} + +/* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ */ + +int lgw_send(struct lgw_pkt_tx_s pkt_data) { + uint8_t buff[255+TX_METADATA_NB]; /* buffer to prepare the packet to send + metadata before SPI write burst */ + uint32_t part_int; /* integer part for PLL register value calculation */ + uint32_t part_frac; /* fractional part for PLL register value calculation */ + int i; + + /* check if the gateway is running */ + if (lgw_is_started == false) { + DEBUG_MSG("ERROR: GATEWAY IS NOT RUNNING, START IT BEFORE SENDING\n"); + return LGW_HAL_ERROR; + } + + /* check input variables */ + CHECK_NULL(pkt_data.payload); + if (pkt_data.rf_chain >= LGW_RF_CHAIN_NB) { + DEBUG_MSG("ERROR: INVALID RF_CHAIN TO SEND PACKETS\n"); + return LGW_HAL_ERROR; + } + if (rf_enable[pkt_data.rf_chain] == false) { + DEBUG_MSG("ERROR: SELECTED RF_CHAIN IS DISABLED\n"); + return LGW_HAL_ERROR; + } + if (pkt_data.freq_hz > rf_tx_upfreq[pkt_data.rf_chain]) { + DEBUG_PRINTF("ERROR: FREQUENCY %d HIGHER THAN UPPER LIMIT %d OF RF_CHAIN %d\n", pkt_data.freq_hz, rf_tx_upfreq[pkt_data.rf_chain], pkt_data.rf_chain); + return LGW_HAL_ERROR; + } else if (pkt_data.freq_hz < rf_tx_lowfreq[pkt_data.rf_chain]) { + DEBUG_PRINTF("ERROR: FREQUENCY %d LOWER THAN LOWER LIMIT %d OF RF_CHAIN %d\n", pkt_data.freq_hz, rf_tx_lowfreq[pkt_data.rf_chain], pkt_data.rf_chain); + return LGW_HAL_ERROR; + } + i = pkt_data.tx_mode; + if ((i != IMMEDIATE) && (i != TIMESTAMPED) && (i != ON_GPS)) { + DEBUG_MSG("ERROR: TX_MODE NOT SUPPORTED\n"); + return LGW_HAL_ERROR; + } + if (pkt_data.modulation == MOD_LORA) { + i = pkt_data.bandwidth; + if ((i != BW_125KHZ) && (i != BW_250KHZ) && (i != BW_500KHZ)) { + DEBUG_MSG("ERROR: BANDWIDTH NOT SUPPORTED BY LORA TX\n"); + return LGW_HAL_ERROR; + } + i = pkt_data.datarate; + if ((i!=DR_LORA_SF7)&&(i!=DR_LORA_SF8)&&(i!=DR_LORA_SF9)&&(i!=DR_LORA_SF10)&&(i!=DR_LORA_SF11)&&(i!=DR_LORA_SF12)) { + DEBUG_MSG("ERROR: DATARATE NOT SUPPORTED BY LORA TX\n"); + return LGW_HAL_ERROR; + } + i = pkt_data.coderate; + if ((i != CR_LORA_4_5) && (i != CR_LORA_4_6) && (i != CR_LORA_4_7) && (i != CR_LORA_4_8)) { + DEBUG_MSG("ERROR: CODERATE NOT SUPPORTED BY LORA TX\n"); + return LGW_HAL_ERROR; + } + if (pkt_data.size > 255) { + DEBUG_MSG("ERROR: PAYLOAD LENGTH TOO BIG FOR LORA TX\n"); + return LGW_HAL_ERROR; + } + }else if ((pkt_data.modulation == MOD_FSK) || (pkt_data.modulation == MOD_GFSK)) { + DEBUG_MSG("ERROR: (G)FSK TX MODULATION NOT SUPPORTED YET\n"); + return LGW_HAL_ERROR; + } else { + DEBUG_MSG("ERROR: INVALID TX MODULATION\n"); + return LGW_HAL_ERROR; + } + + /* metadata 0 to 2, TX PLL frequency */ + part_int = pkt_data.freq_hz / LGW_SW1257_DENUM; /* integer part, gives the MSB and the middle byte */ + part_frac = ((pkt_data.freq_hz % LGW_SW1257_DENUM) << 8) / LGW_SW1257_DENUM; /* fractional part, gives LSB */ + buff[0] = 0xFF & (part_int >> 8); /* Most Significant Byte */ + buff[1] = 0xFF & part_int; /* middle byte */ + buff[2] = 0xFF & part_frac; /* Least Significant Byte */ + + /* metadata 3 to 6, timestamp trigger value */ + buff[3] = 0xFF & (pkt_data.count_us >> 24); + buff[4] = 0xFF & (pkt_data.count_us >> 16); + buff[5] = 0xFF & (pkt_data.count_us >> 8); + buff[6] = 0xFF & pkt_data.count_us; + + /* parameters depending on modulation */ + if (pkt_data.modulation == MOD_LORA) { + /* metadata 7, modulation type, radio chain selection and TX power */ + buff[7] = (0x20 & (pkt_data.rf_chain << 5)) | (0x0F & pkt_data.rf_power); /* bit 4 is 0 -> Lora modulation */ + /* fine control over TX power not supported yet, any value other than 8 is 14 dBm */ + + buff[8] = 0; /* metadata 8, not used */ + + /* metadata 9, CRC, Lora CR & SF */ + switch (pkt_data.datarate) { + case DR_LORA_SF7: buff[9] |= 7; break; + case DR_LORA_SF8: buff[9] |= 8; break; + case DR_LORA_SF9: buff[9] |= 9; break; + case DR_LORA_SF10: buff[9] |= 10; break; + case DR_LORA_SF11: buff[9] |= 11; break; + case DR_LORA_SF12: buff[9] |= 12; break; + default: DEBUG_PRINTF("ERROR: UNEXPECTED VALUE %d IN SWITCH STATEMENT\n", pkt_data.datarate); + } + switch (pkt_data.coderate) { + case CR_LORA_4_5: buff[9] |= 1 << 4; break; + case CR_LORA_4_6: buff[9] |= 2 << 4; break; + case CR_LORA_4_7: buff[9] |= 3 << 4; break; + case CR_LORA_4_8: buff[9] |= 4 << 4; break; + default: DEBUG_PRINTF("ERROR: UNEXPECTED VALUE %d IN SWITCH STATEMENT\n", pkt_data.coderate); + } + if (pkt_data.no_crc == false) { + buff[9] |= 0x80; /* set 'CRC enable' bit */ + } + + /* metadata 10, payload size */ + buff[10] = pkt_data.size; + + /* metadata 11, implicit header & modulation bandwidth */ + switch (pkt_data.bandwidth) { + case BW_125KHZ: buff[11] |= 0; break; + case BW_250KHZ: buff[11] |= 1; break; + case BW_500KHZ: buff[11] |= 2; break; + default: DEBUG_PRINTF("ERROR: UNEXPECTED VALUE %d IN SWITCH STATEMENT\n", pkt_data.bandwidth); + } + if (pkt_data.no_header == true) { + buff[11] |= 0x04; /* set 'implicit header' bit */ + } + + /* metadata 12 & 13, Lora preamble size */ + if (pkt_data.preamble < MIN_LORA_PREAMBLE) { /* enforce minimum preamble size */ + pkt_data.preamble = MIN_LORA_PREAMBLE; + DEBUG_MSG("Note: preamble length adjusted to respect minimum Lora preamble size\n"); + } + buff[12] = 0xFF & (pkt_data.preamble >> 8); + buff[13] = 0xFF & pkt_data.preamble; + + /* metadata 14 & 15, not used */ + buff[14] = 0; + buff[15] = 0; + + } else { + DEBUG_MSG("ERROR: ONLY LORA TX SUPPORTED FOR NOW\n"); + return LGW_HAL_ERROR; + } + + /* copy payload */ + for (i = 0; i < pkt_data.size; ++i) { + buff[i+TX_METADATA_NB] = pkt_data.payload[i]; + } + + /* put metadata + payload in the TX data buffer */ + lgw_reg_w(LGW_TX_DATA_BUF_ADDR, 0); + lgw_reg_wb(LGW_TX_DATA_BUF_DATA, buff, (pkt_data.size + TX_METADATA_NB)); + DEBUG_ARRAY(i, pkt_data.size+TX_METADATA_NB, buff); + + /* send data */ + switch(pkt_data.tx_mode) { + case IMMEDIATE: + lgw_reg_w(LGW_TX_TRIG_IMMEDIATE, 0); + lgw_reg_w(LGW_TX_TRIG_IMMEDIATE, 1); + break; + + case TIMESTAMPED: + lgw_reg_w(LGW_TX_TRIG_DELAYED, 0); + lgw_reg_w(LGW_TX_TRIG_DELAYED, 1); + break; + + case ON_GPS: + lgw_reg_w(LGW_TX_TRIG_GPS, 0); + lgw_reg_w(LGW_TX_TRIG_GPS, 1); + break; + + default: DEBUG_PRINTF("ERROR: UNEXPECTED VALUE %d IN SWITCH STATEMENT\n", pkt_data.tx_mode); + } + + return LGW_HAL_SUCCESS; +} + +/* --- EOF ------------------------------------------------------------------ */ |