Ported from Apache Mynewt OS to BL602...
https://github.com/apache/mynewt-core/tree/master/hw/drivers/lora/sx1276
Read the articles...
To add this driver to an existing BL602 / BL604 project:
cd bl_iot_sdk/components/3rdparty
git submodule add https://github.com/lupyuen/lora-sx1276The pins are defined in include/sx1276.h
Note that BL602 Pins are mapped to specific SPI Functions, so not all SPI Pins may be remapped.
| BL602 Pin | SX1276 / RF96 Pin | Wire Colour |
|---|---|---|
GPIO 0 |
DIO1 |
Dark Green |
GPIO 1 |
ISO (MISO) |
Light Green (Top) |
GPIO 2 |
Do Not Connect | (Unused Chip Select) |
GPIO 3 |
SCK |
Yellow (Top) |
GPIO 4 |
OSI (MOSI) |
Blue (Top) |
GPIO 5 |
DIO2 |
Blue (Bottom) |
GPIO 11 |
DIO0 |
Yellow (Bottom) |
GPIO 12 |
DIO3 |
Light Green (Bottom) |
GPIO 14 |
NSS |
Orange |
GPIO 17 |
RST |
White |
3V3 |
3.3V |
Red |
GND |
GND |
Black |
From include/sx1276.h:
#define SX1276_SPI_IDX 0 // SPI Port 0
#define SX1276_SPI_SDI_PIN 1 // SPI Serial Data In Pin (formerly MISO)
#define SX1276_SPI_SDO_PIN 4 // SPI Serial Data Out Pin (formerly MOSI)
#define SX1276_SPI_CLK_PIN 3 // SPI Clock Pin
#define SX1276_SPI_CS_PIN 14 // SPI Chip Select Pin
#define SX1276_SPI_CS_OLD 2 // Unused SPI Chip Select Pin
#define SX1276_NRESET 17 // Reset Pin
#define SX1276_DIO0 11 // DIO0: Trigger for Packet Received
#define SX1276_DIO1 0 // DIO1: Trigger for Sync Timeout
#define SX1276_DIO2 5 // DIO2: Trigger for Change Channel (Spread Spectrum / Frequency Hopping)
#define SX1276_DIO3 12 // DIO3: Trigger for CAD Done
#define SX1276_DIO4 -1 // DIO4: Unused (FSK only)
#define SX1276_DIO5 -1 // DIO5: Unused (FSK only)
#define SX1276_SPI_BAUDRATE (200 * 1000) // SPI Frequency (200 kHz)
#define SX1276_LF_USE_PA_BOOST 1 // Enable Power Amplifier Boost for LoRa Frequency below 525 MHz
#define SX1276_HF_USE_PA_BOOST 1 // Enable Power Amplifier Boost for LoRa Frequency 525 MHz and above(CAD = Channel Activity Detection. We detect whether a Radio Channel is in use, by scanning very quickly for the LoRa Packet Preamble)
To transmit and receive LoRa packets with the driver, run the sdk_app_lora BL602 Demo Firmware...
Here's a sample log...
# create_task
# init_driver
SX1276 init
SX1276 interrupt init
SX1276 register handler: GPIO 11
SX1276 register handler: GPIO 0
SX126 register handler: GPIO 5
SX1276 register handler: GPIO 12
TODO: os_cputime_delay_usecs 1000
TODO: os_cputime_delay_usecs 6000
SX1276 DIO3: Channel activity detection
# receive_message
SX1276 DIO0: Packet received
Rx done: RadioEvents.RxDone=0x23000ca6
Rx done:
48 65 6c 6c 6f
# spi_result
DIO0 Interrupts: 1
DIO1 Interrupts: 0
DIO2 Interrupts: 0
DIO3 Interrupts: 1
DIO4 Interrupts: 0
DIO5 Interrupts: 0
Unknown Int: 0
Tx Interrupts: 302
Tx Status: 0x0
Tx Term Count: 0x0
Tx Error: 0x0
Rx Interrupts: 302
Rx Status: 0x0
Rx Term Count: 0x0
Rx Error: 0x0
# receive_message
SX1276 DIO0: Packet received
Rx done: RadioEvents.RxDone=0x23000ca6
Rx done:
48 65 6c 6c 6f
# spi_result
DIO0 Interrupts: 2
DIO1 Interrupts: 0
DIO2 Interrupts: 0
DIO3 Interrupts: 1
DIO4 Interrupts: 0
DIO5 Interrupts: 0
Unknown Int: 0
Tx Interrupts: 354
Tx Status: 0x0
Tx Term Count: 0x0
Tx Error: 0x0
Rx Interrupts: 354
Rx Status: 0x0
Rx Term Count: 0x0
Rx Error: 0x0
# receive_message
SX1276 DIO0: Packet received
Rx done: RadioEvents.RxDone=0x23000ca6
Rx done:
48 65 6c 6c 6f
# spi_result
DIO0 Interrupts: 3
DIO1 Interrupts: 0
DIO2 Interrupts: 0
DIO3 Interrupts: 1
DIO4 Interrupts: 0
DIO5 Interrupts: 0
Unknown Int: 0
Tx Interrupts: 406
Tx Status: 0x0
Tx Term Count: 0x0
Tx Error: 0x0
Rx Interrupts: 406
Rx Status: 0x0
Rx Term Count: 0x0
Rx Error: 0x0
# receive_message
SX1276 DIO0: Packet received
Rx done: RadioEvents.RxDone=0x23000ca6
Rx done:
48 65 6c 6c 6f
# spi_result
DIO0 Interrupts: 4
DIO1 Interrupts: 0
DIO2 Interrupts: 0
DIO3 Interrupts: 1
DIO4 Interrupts: 0
DIO5 Interrupts: 0
Unknown Int: 0
Tx Interrupts: 458
Tx Status: 0x0
Tx Term Count: 0x0
Tx Error: 0x0
Rx Interrupts: 458
Rx Status: 0x0
Rx Term Count: 0x0
Rx Error: 0x0
# receive_message
SX1276 receive timeout
Rx timeout
# receive_message
SX1276 DIO0: Packet received
Rx done: RadioEvents.RxDone=0x23000ca8
Rx done:
48 65 6c 6c 6f
# receive_message
SX1276 DIO0: Packet received
Rx done: RadioEvents.RxDone=0x23000ca8
Rx done:
48 65 6c 6c 6f
# receive_message
SX1276 receive timeout
Rx timeout
# receive_message
SX1276 DIO0: Packet received
Rx done: RadioEvents.RxDone=0x23000ca8
Rx done:
48 65 6c 6c 6f
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