Driver library for SX1272/SX1276 transceivers
Fork of SX127x by
sx127x.cpp
- Committer:
- dudmuck
- Date:
- 2014-06-30
- Revision:
- 6:5d94ee847016
- Parent:
- 4:d987ac2836bf
- Child:
- 7:c785b65d3db4
File content as of revision 6:5d94ee847016:
#include "sx127x.h" /* SX127x driver * Copyright (c) 2013 Semtech * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ SX127x::SX127x(PinName mosi, PinName miso, PinName sclk, PinName cs, PinName rst, PinName dio_0, PinName dio_1, PinName fem_ctx, PinName fem_cps) : m_spi(mosi, miso, sclk), m_cs(cs), reset_pin(rst), dio0(dio_0), dio1(dio_1), femctx(fem_ctx), femcps(fem_cps) { reset_pin.input(); m_cs = 1; m_spi.format(8, 0); m_spi.frequency(3000000); init(); } SX127x::~SX127x() { set_opmode(RF_OPMODE_SLEEP); } void SX127x::init() { type = SX_NONE; RegOpMode.octet = read_reg(REG_OPMODE); RegPaConfig.octet = read_reg(REG_PACONFIG); RegLna.octet = read_reg(REG_LNA); RegDioMapping1.octet = read_reg(REG_DIOMAPPING1); RegDioMapping2.octet = read_reg(REG_DIOMAPPING2); /* if (!RegOpMode.bits.LongRangeMode) { if (RegOpMode.bits.Mode != RF_OPMODE_SLEEP) set_opmode(RF_OPMODE_SLEEP); RegOpMode.bits.LongRangeMode = 1; write_reg(REG_OPMODE, RegOpMode.octet); }*/ get_type(); if (type == SX1272) { // turn on PA BOOST, eval boards are wired for this connection RegPaConfig.bits.PaSelect = 1; write_reg(REG_PACONFIG, RegPaConfig.octet); } } void SX127x::get_type() { RegOpMode.octet = read_reg(REG_OPMODE); if (RegOpMode.sx1276LORAbits.LowFrequencyModeOn) type = SX1276; else { RegOpMode.sx1276LORAbits.LowFrequencyModeOn = 1; write_reg(REG_OPMODE, RegOpMode.octet); RegOpMode.octet = read_reg(REG_OPMODE); if (RegOpMode.sx1276LORAbits.LowFrequencyModeOn) type = SX1276; else type = SX1272; } } void SX127x::ReadBuffer( uint8_t addr, uint8_t *buffer, uint8_t size ) { uint8_t i; m_cs = 0; m_spi.write(addr); // bit7 is low for reading from radio for( i = 0; i < size; i++ ) { buffer[i] = m_spi.write(0x00); } m_cs = 1; } uint8_t SX127x::read_reg(uint8_t addr) { uint8_t ret; // Select the device by seting chip select low m_cs = 0; m_spi.write(addr); // bit7 is low for reading from radio // Send a dummy byte to receive the contents of register ret = m_spi.write(0x00); // Deselect the device m_cs = 1; return ret; } int16_t SX127x::read_s16(uint8_t addr) { int16_t ret; // Select the device by seting chip select low m_cs = 0; m_spi.write(addr); // bit7 is low for reading from radio // Send a dummy byte to receive the contents of register ret = m_spi.write(0x00); ret <<= 8; ret += m_spi.write(0x00); // Deselect the device m_cs = 1; return ret; } uint16_t SX127x::read_u16(uint8_t addr) { uint16_t ret; // Select the device by seting chip select low m_cs = 0; m_spi.write(addr); // bit7 is low for reading from radio // Send a dummy byte to receive the contents of register ret = m_spi.write(0x00); ret <<= 8; ret += m_spi.write(0x00); // Deselect the device m_cs = 1; return ret; } void SX127x::write_u16(uint8_t addr, uint16_t data) { m_cs = 0; // Select the device by seting chip select low m_spi.write(addr | 0x80); // bit7 is high for writing to radio m_spi.write((data >> 8) & 0xff); m_spi.write(data & 0xff); m_cs = 1; // Deselect the device } void SX127x::write_u24(uint8_t addr, uint32_t data) { m_cs = 0; // Select the device by seting chip select low m_spi.write(addr | 0x80); // bit7 is high for writing to radio m_spi.write((data >> 16) & 0xff); m_spi.write((data >> 8) & 0xff); m_spi.write(data & 0xff); m_cs = 1; // Deselect the device if (addr == REG_FRFMSB) { if (data < 0x8340000) // < 525MHz HF = false; else HF = true; } } void SX127x::write_reg(uint8_t addr, uint8_t data) { m_cs = 0; // Select the device by seting chip select low m_spi.write(addr | 0x80); // bit7 is high for writing to radio m_spi.write(data); m_cs = 1; // Deselect the device } void SX127x::WriteBuffer( uint8_t addr, uint8_t *buffer, uint8_t size ) { uint8_t i; m_cs = 0; // Select the device by seting chip select low m_spi.write(addr | 0x80); // bit7 is high for writing to radio for( i = 0; i < size; i++ ) { m_spi.write(buffer[i]); } m_cs = 1; // Deselect the device } void SX127x::set_opmode(chip_mode_e mode) { RegOpMode.bits.Mode = mode; if (mode == RF_OPMODE_TRANSMITTER) { // start of transmission if (HF) femctx = 1; else femcps = 0; } else if (mode == RF_OPMODE_RECEIVER) { // start of reception if (HF) femctx = 0; else femcps = 1; } write_reg(REG_OPMODE, RegOpMode.octet); } void SX127x::set_frf_MHz( float MHz ) { uint32_t frf; frf = MHz / FREQ_STEP_MHZ; write_u24(REG_FRFMSB, frf); if (MHz < 525) HF = false; else HF = true; } float SX127x::get_frf_MHz(void) { uint32_t frf; uint8_t lsb, mid, msb; float MHz; msb = read_reg(REG_FRFMSB); mid = read_reg(REG_FRFMID); lsb = read_reg(REG_FRFLSB); frf = msb; frf <<= 8; frf += mid; frf <<= 8; frf += lsb; MHz = frf * FREQ_STEP_MHZ; if (MHz < 525) HF = false; else HF = true; return MHz; } void SX127x::hw_reset() { /* only a french-swiss design would have hi-Z deassert */ reset_pin.output(); reset_pin.write(1); wait(0.05); reset_pin.input(); wait(0.05); }