initial commit.... after 6 months

This commit is contained in:
Morgan Allen 2018-07-28 11:33:15 -07:00
commit 1906e8f46d
6 changed files with 624 additions and 0 deletions

25
Kconfig Normal file
View File

@ -0,0 +1,25 @@
menuconfig LORA32_ENABLED
bool "LORA32"
help
Select this option to enable LORA32 driver and show the submodule with configuration
config LORA32_NSS_PIN
int "GPIO to handle NSS"
depends on LORA32_ENABLED
default 18
help
GPIO to handle NSS
config LORA32_RESET_PIN
int "GPIO to handle RESET"
depends on LORA32_ENABLED
default 14
help
GPIO to handle RESET
config LORA32_DIO0_PIN
int "GPIO to handle DIO0"
depends on LORA32_ENABLED
default 26
help
GPIO to handle DIO0

8
Makefile Normal file
View File

@ -0,0 +1,8 @@
#
# This is a project Makefile. It is assumed the directory this Makefile resides in is a
# project subdirectory.
#
PROJECT_NAME := esp32-lora
include $(IDF_PATH)/make/project.mk

18
README.md Normal file
View File

@ -0,0 +1,18 @@
# ESP32 LoRa (SX127*)
Provides SPI driver for SX1276/SX1278 LoRa radio
## Usage
Designed to be used as `esp-idf component`. Suggested using as `git submodule`
```
git submodule add https://gitlab.com/morganrallen/esp32-lora.git components/esp32-lora/
git submodule init
git submodule update
```
## Configure
Uses built in KConfig. Run `make menuconfig` and find config under `Component config` -> `LORA32`.
Defaults targeted to TTGO LoRa OLED boards.

9
component.mk Normal file
View File

@ -0,0 +1,9 @@
ifdef CONFIG_LORA32_ENABLED
COMPONENT_SRCDIRS := main
COMPONENT_ADD_INCLUDEDIRS := main include
COMPONENT_ADD_LDFLAGS := -lesp32-lora
COMPONENT_EXTRA_CLEAN :=
endif

108
include/esp32-lora.h Normal file
View File

@ -0,0 +1,108 @@
#ifndef _LORA32_H__
#define _LORA32_H__
#include "driver/spi_common.h"
#include "driver/spi_master.h"
#define REG_FIFO 0x00
#define REG_OP_MODE 0x01
#define REG_BR_MSB 0x02
#define REG_BR_LSB 0x03
#define REG_FD_MSB 0x04
#define REG_FD_LSB 0x05
#define REG_FRF_MSB 0x06
#define REG_FRF_MID 0x07
#define REG_FRF_LSB 0x08
#define REG_PA_CONFIG 0x09
#define REG_LNA 0x0c
#define REG_FIFO_ADDR_PTR 0x0d
#define REG_FIFO_TX_BASE_ADDR 0x0e
#define REG_FIFO_RX_BASE_ADDR 0x0f
#define REG_FIFO_RX_CURRENT_ADDR 0x10
#define REG_IRQ_FLAGS 0x12
#define REG_RX_NB_BYTES 0x13
#define REG_PKT_RSSI_VALUE 0x1a
#define REG_PKT_SNR_VALUE 0x1b
#define REG_MODEM_CONFIG_1 0x1d
#define REG_MODEM_CONFIG_2 0x1e
#define REG_PREAMBLE_MSB 0x20
#define REG_PREAMBLE_LSB 0x21
#define REG_PAYLOAD_LENGTH 0x22
#define REG_MODEM_CONFIG_3 0x26
#define REG_RSSI_WIDEBAND 0x2c
#define REG_DETECTION_OPTIMIZE 0x31
#define REG_DETECTION_THRESHOLD 0x37
#define REG_SYNC_WORD 0x39
#define REG_DIO_MAPPING_1 0x40
#define REG_VERSION 0x42
// modes
#define MODE_LONG_RANGE_MODE 0x80
#define MODE_SLEEP 0x00
#define MODE_STANDBY 0x01
#define MODE_TX 0x03
#define MODE_RX_CONTINUOUS 0x05
#define MODE_RX_SINGLE 0x06
// PA config
#define PA_BOOST 0x80
// IRQ masks
#define IRQ_TX_DONE_MASK 0x08
#define IRQ_PAYLOAD_CRC_ERROR_MASK 0x20
#define IRQ_RX_DONE_MASK 0x40
#define MAX_PKT_LENGTH 255
#define DETECT_OPT_SF6 0xC5
#define DETECT_OPT_OTHER 0xC3
#define DETECT_THRES_SF6 0x0C
#define DETECT_THRES_OTHER 0x0A
#define DEFAULT_SF 7
#define DEFAULT_PREAMBLE 8
#define DEFAULT_CR 5
enum freq {
F433, F866, F915
} lora32_freq;
const long long frequencies[3];
const long bandwidths[9];
enum bandwidth {
B78, B104, B156, B208, B3125, B417, B625, B125, B250
};
typedef void (*receiveCallback)(uint8_t *data, uint8_t size);
typedef struct lora32_cfg_t {
uint8_t nss;
uint8_t dio0;
uint8_t reset;
uint8_t fifoIdx;
long frequency;
enum bandwidth bandwidth;
uint8_t spreadingFactor;
uint8_t codingRate;
uint16_t preamble;
bool useCRC;
bool implicitHeader;
bool poll_rx;
receiveCallback receive;
spi_device_handle_t spi;
} lora32_cfg_t;
lora32_cfg_t lora32_create();
uint8_t lora32_init(lora32_cfg_t *config);
uint8_t lora32_data_available(lora32_cfg_t *lora);
uint8_t lora32_parse_packet(lora32_cfg_t *lora, uint8_t size);
void lora32_send(lora32_cfg_t *config, uint8_t *data, uint8_t len);
void lora32_set_spreadfactor(lora32_cfg_t *lora, uint8_t factor);
void lora32_dump_regs(lora32_cfg_t *lora);
#endif // _LORA32_H__

456
main/esp32-lora.c Normal file
View File

@ -0,0 +1,456 @@
#include <string.h>
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "esp_log.h"
#include "esp_heap_caps.h"
#include "driver/gpio.h"
#include "driver/spi_common.h"
#include "driver/spi_master.h"
#include "esp32-lora.h"
#define READ_REG 0x7F
#define WRITE_REG 0x80
#define PIN_NUM_MISO 19
#define PIN_NUM_MOSI 27
#define PIN_NUM_CLK 5
#define PA_OUTPUT_RFO_PIN 0
#define PA_OUTPUT_PA_BOOST_PIN 1
static xQueueHandle dio0_evt_queue = NULL;
const long long frequencies[] = { 433e+6, 866e+6, 915e+6 };
const long bandwidths[] = { 7.8e+3, 10.4e+3, 15.6e+3, 20.8e+3, 31.25e+3, 41.7e+3, 62.5e+3, 125e+3, 250e+3 };
const char *TAG = "LoRa32";
lora32_cfg_t lora32_create() {
static spi_device_handle_t spi;
return (lora32_cfg_t){
.bandwidth = bandwidths[F866],
.codingRate = DEFAULT_CR,
.dio0 = CONFIG_LORA32_DIO0_PIN,
.implicitHeader = false,
.nss = CONFIG_LORA32_NSS_PIN,
.reset = CONFIG_LORA32_RESET_PIN,
.frequency = 866000000,
.poll_rx = false,
.preamble = DEFAULT_PREAMBLE,
.spreadingFactor = DEFAULT_SF,
.spi = spi,
.receive = NULL,
.useCRC = false,
.fifoIdx = 0
};
}
void lora32_send_cmd(lora32_cfg_t lora, uint8_t cmd, uint8_t value, uint8_t len, uint8_t *rx_buffer) {
uint8_t tx_buffer[2];
tx_buffer[0] = cmd;
tx_buffer[1] = value;
spi_transaction_t t;
memset(&t, 0, sizeof(t));
t.length = 8 * len;
t.rxlength = 8 * len;
t.tx_buffer = &tx_buffer;
t.rx_buffer = rx_buffer;
ESP_ERROR_CHECK(spi_device_transmit(lora.spi, &t));
//ESP_LOGI(TAG, "send_cmd rx_data: 0x%2X 0x%2X", rx_buffer[0], rx_buffer[1]);
}
uint8_t lora32_read_reg(lora32_cfg_t *lora, uint8_t address) {
spi_transaction_t t;
memset(&t, 0, sizeof(spi_transaction_t));
t.length = 16;
t.flags = SPI_TRANS_USE_TXDATA | SPI_TRANS_USE_RXDATA;
t.tx_data[0] = address & READ_REG;
t.tx_data[1] = 0x00;
ESP_ERROR_CHECK(spi_device_transmit(lora->spi, &t));
//ESP_LOGI(TAG, "<%2X<%2X", address, t.rx_data[1]);
return t.rx_data[1];
}
void lora32_write_reg(lora32_cfg_t *lora, uint8_t address, uint8_t value) {
spi_device_handle_t spi = lora->spi;
spi_transaction_t t;
memset(&t, 0, sizeof(spi_transaction_t));
//ESP_LOGI(TAG, ">%2X>%2X", address, value);
t.length = 16;
t.flags = SPI_TRANS_USE_TXDATA;
t.tx_data[0] = address | WRITE_REG;
t.tx_data[1] = value;
ESP_ERROR_CHECK(spi_device_transmit(spi, &t));
};
void lora23_set_explicit_header(lora32_cfg_t *lora) {
lora->implicitHeader = false;
lora32_write_reg(lora, REG_MODEM_CONFIG_1, lora32_read_reg(lora, REG_MODEM_CONFIG_1) & 0xFE);
}
void lora23_set_implicit_header(lora32_cfg_t *lora) {
lora->implicitHeader = true;
lora32_write_reg(lora, REG_MODEM_CONFIG_1, lora32_read_reg(lora, REG_MODEM_CONFIG_1) | 0x01);
}
void lora32_idle(lora32_cfg_t *lora) {
lora32_write_reg(lora, REG_OP_MODE, MODE_LONG_RANGE_MODE | MODE_STANDBY);
}
void lora32_sleep(lora32_cfg_t *lora) {
lora32_write_reg(lora, REG_OP_MODE, MODE_LONG_RANGE_MODE | MODE_SLEEP);
//ESP_LOGI(TAG, "REG_OP_MODE: 0x%2X", lora32_read_reg(spi, REG_OP_MODE));
}
void lora32_enable_tx(lora32_cfg_t *lora) {
lora32_idle(lora);
if(lora->implicitHeader)
lora23_set_implicit_header(lora);
else
lora23_set_explicit_header(lora);
// zero out receive buffer
lora32_write_reg(lora, REG_FIFO_ADDR_PTR, 0);
lora32_write_reg(lora, REG_PAYLOAD_LENGTH, 0);
}
void lora32_send(lora32_cfg_t *lora, uint8_t *data, uint8_t len) {
lora32_enable_tx(lora);
uint8_t i = 0;
for(; (i < len && i < MAX_PKT_LENGTH); i++)
lora32_write_reg(lora, REG_FIFO, data[i]);
lora32_write_reg(lora, REG_PAYLOAD_LENGTH, len);
lora32_write_reg(lora, REG_OP_MODE, MODE_LONG_RANGE_MODE | MODE_TX);
ESP_LOGD(TAG, "lora32_send waiting for TX to finish");
// can be made async by waiting for DIO0 and checking for IRQ_TX_DONE_MASK
while((lora32_read_reg(lora, REG_IRQ_FLAGS) & IRQ_TX_DONE_MASK) == 0) {
vTaskDelay(1 / portTICK_PERIOD_MS);
}
ESP_LOGD(TAG, "lora32_send TX done");
lora32_write_reg(lora, REG_IRQ_FLAGS, IRQ_TX_DONE_MASK);
}
void lora32_set_frequency(lora32_cfg_t *lora, long frequency) {
uint64_t frf = ((uint64_t)frequency << 19) / 32000000;
ESP_LOGI(TAG, "REG_FRF_MSB: 0x%2X", (uint8_t)(frf >> 16));
ESP_LOGI(TAG, "REG_FRF_MID: 0x%2X", (uint8_t)(frf >> 8));
ESP_LOGI(TAG, "REG_FRF_LSB: 0x%2X", (uint8_t)(frf >> 0));
lora32_write_reg(lora, REG_FRF_MSB, (uint8_t)(frf >> 16) & 0xFF);
lora32_write_reg(lora, REG_FRF_MID, (uint8_t)(frf >> 8) & 0xFF);
lora32_write_reg(lora, REG_FRF_LSB, (uint8_t)(frf >> 0) & 0xFF);
//ESP_LOGI(TAG, "REG_FRF_MSB: 0x%2X", lora32_read_reg(spi, REG_FRF_MSB));
//ESP_LOGI(TAG, "REG_FRF_MID: 0x%2X", lora32_read_reg(spi, REG_FRF_MID));
//ESP_LOGI(TAG, "REG_FRF_LSB: 0x%2X", lora32_read_reg(spi, REG_FRF_LSB));
}
void lora32_set_tx_power(lora32_cfg_t *lora, uint8_t level, uint8_t output) {
ESP_LOGI(TAG, "set_tx_power(%d, %d)", level, output);
if(output == PA_OUTPUT_RFO_PIN) {
if(level > 14) level = 14;
lora32_write_reg(lora, REG_PA_CONFIG, 0x70 | level);
} else {
if(level < 2) level = 2;
else if(level > 17) level = 17;
lora32_write_reg(lora, REG_PA_CONFIG, PA_BOOST | (level - 2));
}
//ESP_LOGI(TAG, "REG_PA_CONFIG: 0x%2X", lora32_read_reg(spi, REG_PA_CONFIG));
}
uint8_t lora32_parse_packet(lora32_cfg_t *lora, uint8_t size) {
uint8_t length = 0;
uint8_t irqs = lora32_read_reg(lora, REG_IRQ_FLAGS);
if(size > 0) {
lora23_set_implicit_header(lora);
lora32_write_reg(lora, REG_PAYLOAD_LENGTH, size & 0xFF);
} else {
lora23_set_explicit_header(lora);
}
lora32_write_reg(lora, REG_IRQ_FLAGS, irqs);
//ESP_LOGI(TAG, "irqs: 0x%2X", irqs);
//ESP_LOGI(TAG, "irqs: 0x%2X", lora32_read_reg(spi, REG_IRQ_FLAGS));
if ((irqs & IRQ_RX_DONE_MASK) && (irqs & IRQ_PAYLOAD_CRC_ERROR_MASK) == 0) {
lora->fifoIdx = 0;
if(lora->implicitHeader) {
length = lora32_read_reg(lora, REG_PAYLOAD_LENGTH);
} else {
length = lora32_read_reg(lora, REG_RX_NB_BYTES);
}
lora32_write_reg(lora, REG_FIFO_ADDR_PTR, lora32_read_reg(lora, REG_FIFO_RX_CURRENT_ADDR));
lora32_idle(lora);
} else if(lora32_read_reg(lora, REG_OP_MODE) != (MODE_LONG_RANGE_MODE | MODE_RX_SINGLE)) {
lora32_write_reg(lora, REG_FIFO_ADDR_PTR, 0);
//lora32_write_reg(lora, REG_OP_MODE, MODE_LONG_RANGE_MODE | MODE_RX_SINGLE);
} else {
//ESP_LOGI(TAG, "no irqs?");
}
return length;
}
uint8_t lora32_data_available(lora32_cfg_t *lora) {
return lora32_read_reg(lora, REG_RX_NB_BYTES) - lora->fifoIdx;
}
void lora32_poll_rx(void *vp) {
lora32_cfg_t *lora = (lora32_cfg_t*)vp;
uint8_t msg[MAX_PKT_LENGTH];
while(true) {
lora32_parse_packet(lora, 0);
if(lora32_data_available(lora)) {
memset(msg, 0, MAX_PKT_LENGTH);
while(lora32_data_available(lora)) {
msg[lora->fifoIdx] = lora32_read_reg(lora, REG_FIFO);
lora->fifoIdx++;
}
lora->receive((uint8_t*)&msg, lora->fifoIdx);
}
vTaskDelay(100 / portTICK_PERIOD_MS);
}
}
void lora32_dump_regs(lora32_cfg_t *lora) {
for(uint8_t i = 0; i < 127; i++) {
printf("0x%2X: 0x%2X\n", i, lora32_read_reg(lora, i));
}
}
void lora32_toggle_reset(lora32_cfg_t *config) {
// toggle reset (L/H)
ESP_LOGI(TAG, "Toggling reset pin %d", config->reset);
gpio_set_level(config->reset, 0);
vTaskDelay(100 / portTICK_PERIOD_MS); // requires 100us
gpio_set_level(config->reset, 1);
vTaskDelay(100 / portTICK_PERIOD_MS); // 5ms before available
}
void lora32_set_spreadfactor(lora32_cfg_t *lora, uint8_t factor) {
ESP_LOGI(TAG, "lora32_set_spreadfactor: %d", factor);
if(factor <= 6) {
factor = 6;
lora32_write_reg(lora, REG_DETECTION_OPTIMIZE, DETECT_OPT_SF6);
lora32_write_reg(lora, REG_DETECTION_THRESHOLD, DETECT_THRES_SF6);
} else {
if(factor > 12) factor = 12;
lora32_write_reg(lora, REG_DETECTION_OPTIMIZE, DETECT_OPT_OTHER);
lora32_write_reg(lora, REG_DETECTION_THRESHOLD, DETECT_THRES_OTHER);
}
lora32_write_reg(lora, REG_MODEM_CONFIG_2, (lora32_read_reg(lora, REG_MODEM_CONFIG_2) & 0x0F) | ((factor << 4) & 0xF0));
}
void lora32_enable_continous_rx(lora32_cfg_t *lora) {
ESP_LOGD(TAG, "enabling continuous receive");
lora32_write_reg(lora, REG_OP_MODE, MODE_LONG_RANGE_MODE | MODE_RX_CONTINUOUS);
}
void lora32_handle_dio0(void *arg) {
lora32_cfg_t *lora = (lora32_cfg_t*)arg;
static uint8_t msg[MAX_PKT_LENGTH];
while(1) {
if(xQueueReceive(dio0_evt_queue, lora, portMAX_DELAY)) {
ESP_LOGI(TAG, "handling DIO0");
memset(msg, 0, MAX_PKT_LENGTH);
// read IRQ flags
uint8_t irqs = lora32_read_reg(lora, REG_IRQ_FLAGS);
// clear IRQ flags
lora32_write_reg(lora, REG_IRQ_FLAGS, irqs);
// TODO: read packet length
uint8_t len = lora32_read_reg(lora, lora->implicitHeader ? REG_PAYLOAD_LENGTH : REG_RX_NB_BYTES);
ESP_LOGD(TAG, "lora32_handle_dio0 packet length: %d", len);
// TODO: set FIFO address to RX address
uint8_t fifo_addr = lora32_read_reg(lora, REG_FIFO_RX_CURRENT_ADDR);
ESP_LOGD(TAG, "lora32_handle_dio0 current FIFO address: %d", fifo_addr);
lora32_write_reg(lora, REG_FIFO_ADDR_PTR, fifo_addr);
uint8_t i = 0;
for(; i < len; i++) {
msg[lora->fifoIdx] = lora32_read_reg(lora, REG_FIFO);
lora->fifoIdx++;
}
ESP_LOGD(TAG, "lora32_handle_dio0: %s", msg);
lora->fifoIdx = 0;
lora32_write_reg(lora, REG_FIFO_ADDR_PTR, 0);
lora->receive((uint8_t*)&msg, len);
}
}
}
static void IRAM_ATTR lora32_on_dio0(void *arg) {
uint8_t i = 0;
xQueueSendFromISR(dio0_evt_queue, &i, NULL);
}
uint8_t lora32_init(lora32_cfg_t *lora) {
ESP_LOGD(TAG, "lora32_init");
// set pin outputs
gpio_config_t io_conf;
io_conf.intr_type = GPIO_PIN_INTR_DISABLE;
io_conf.mode = GPIO_MODE_OUTPUT;
io_conf.pin_bit_mask = (1ULL<<lora->reset)|(1ULL<<lora->nss);
io_conf.pull_down_en = 0;
io_conf.pull_up_en = 0;
gpio_config(&io_conf);
lora32_toggle_reset(lora);
// set NSS high
ESP_LOGI(TAG, "Bringing NSS high: %d", lora->nss);
gpio_set_level(lora->nss, 1);
vTaskDelay(10 / portTICK_PERIOD_MS);
// init spi
ESP_LOGI(TAG, "Initializing SPI bus");
ESP_LOGI(TAG, "\n MISO: %d\nMOSI: %d\nCLK: %d\nNSS: %d", PIN_NUM_MISO, PIN_NUM_MOSI, PIN_NUM_CLK, lora->nss);
spi_bus_config_t buscfg = {
.miso_io_num = PIN_NUM_MISO,
.mosi_io_num = PIN_NUM_MOSI,
.sclk_io_num = PIN_NUM_CLK,
.quadwp_io_num = -1,
.quadhd_io_num = -1
};
spi_device_interface_config_t devcfg = {
.clock_speed_hz = 8E6,
.flags = 0,
.mode = 0,
.spics_io_num = lora->nss,
.queue_size = 7,
};
ESP_ERROR_CHECK(spi_bus_initialize(HSPI_HOST, &buscfg, 0));
ESP_ERROR_CHECK(spi_bus_add_device(HSPI_HOST, &devcfg, &lora->spi));
uint8_t version = lora32_read_reg(lora, REG_VERSION);
ESP_LOGD(TAG, "lora32_get_id() == 0x%2X", version);
assert(version == 0x12);
// TODO: confirm this is happening. Before/after power measurements?
lora32_sleep(lora);
ESP_LOGI(TAG, "lora32_sleep");
// TODO: VERIFY
lora32_set_frequency(lora, lora->frequency);
ESP_LOGI(TAG, "lora32_set_frequency: %lu", lora->frequency);
lora32_write_reg(lora, REG_FIFO_TX_BASE_ADDR, 0x00);
lora32_write_reg(lora, REG_FIFO_RX_BASE_ADDR, 0x00);
ESP_LOGI(TAG, "clear rx/tx fifos");
uint8_t lna = lora32_read_reg(lora, REG_LNA);
lora32_write_reg(lora, REG_LNA, lna | 0x03);
ESP_LOGI(TAG, "set lna: 0x%2X", lna | 0x03);
lora32_write_reg(lora, REG_MODEM_CONFIG_3, 0x04);
//ESP_LOGI(TAG, "REG_MODEM_CONFIG_3: 0x%2X", lora32_read_reg(spi, REG_MODEM_CONFIG_3));
lora32_set_tx_power(lora, 17, PA_OUTPUT_PA_BOOST_PIN);
ESP_LOGI(TAG, "lora32_set_tx_power");
lora32_idle(lora);
ESP_LOGI(TAG, "lora32_idle");
//ESP_LOGI(TAG, "REG_OP_MODE: 0x%2X", lora32_read_reg(spi, REG_OP_MODE));
if(lora->receive != NULL) {
ESP_LOGI(TAG, "Setting callback handler");
dio0_evt_queue = xQueueCreate(10, sizeof(uint8_t));
io_conf.intr_type = GPIO_PIN_INTR_POSEDGE;
io_conf.pin_bit_mask = (1ULL << CONFIG_LORA32_DIO0_PIN);
io_conf.mode = GPIO_MODE_INPUT;
io_conf.pull_down_en = 0;
io_conf.pull_up_en = 0;
gpio_config(&io_conf);
gpio_set_intr_type(CONFIG_LORA32_DIO0_PIN, GPIO_INTR_POSEDGE);
gpio_install_isr_service(0);
gpio_isr_handler_add(CONFIG_LORA32_DIO0_PIN, lora32_on_dio0, (void*)lora);
// this should probably be high priority
xTaskCreate(&lora32_handle_dio0, "lora32_handle_dio0", 2048, lora, 6, NULL);
lora32_write_reg(lora, REG_DIO_MAPPING_1, 0x00);
lora32_enable_continous_rx(lora);
}
if(lora->poll_rx) {
ESP_LOGI(TAG, "enabling rx polling");
xTaskCreate(&lora32_poll_rx, "lora32_poll_rx", 2048, lora, 6, NULL);
}
//lora32_dump_regs(spi);
return 1;
};