Firmware: Develop a driver for the SX127x transceiver

[mgm8]

Reference: https://www.semtech.com/products/wireless-rf/lora-core/sx1278
Driver reference: https://www.nicerf.com/products/detail/sx1278-wireless-module-lora1278f30.html

[miguelboing]

Implementation progress:

• sx127x_init(void);
• sx127x_rx_init(void);
• sx127x_tx_packet(uint8_t *data, uint16_t len);
• sx127x_rx_packet(uint8_t *data, uint16_t *len);
• sx127x_wait_irq(uint8_t irq_mask);
• sx127x_enter_standby_mode(void);
• sx127x_enter_sleep_mode(void);
• sx127x_clear_interrupt(void);
• sx127x_set_frequency(uint32_t freq);
• sx127x_set_rf_param(uint8_t bw, uint8_t cr, uint8_t sf, uint8_t crc);
• sx127x_set_preamble_len(uint16_t len);
• sx127x_set_header_mode(uint8_t mode);
• sx127x_set_payload_len(uint8_t len);
• sx127x_set_tx_power(uint8_t pwr);
• sx127x_set_rx_timeout(uint16_t symb_timeout);
• sx127x_read_rssi(uint8_t mode, uint8_t rssi_val);
• sx127x_power_on_reset(void);
• sx127x_config(void);
• sx127x_set_ant_switch(sx127x_mode_t mode);
• sx127x_set_fifo_addr_ptr(uint8_t adr);
• sx127x_enter_rx_mode(void);
• sx127x_enter_tx_mode(void);
• sx127x_write_fifo(uint8_t *data, uint8_t len);
• sx127x_read_fifo(uint8_t *data, uint8_t *len);
• sx127x_set_tx_interrupt(void);
• sx127x_set_rx_interrupt(void);
• sx127x_read_reg(uint8_t adr, uint8_t *val);
• sx127x_write_reg(uint8_t adr, uint8_t val);
• sx127x_burst_read(uint8_t adr, uint8_t *ptr, uint8_t len);
• sx127x_burst_write(uint8_t adr, uint8_t *ptr, uint8_t len);
• sx127x_spi_init(void);
• sx127x_spi_transfer(uint8_t *wd, uint8_t *rd, uint16_t len);
• sx127x_spi_write_byte(uint8_t byte);
• sx127x_spi_write(uint8_t *data, uint16_t len);
• sx127x_spi_read(uint8_t *data, uint16_t len);
• sx127x_gpio_init(void);
• sx127X_gpio_write_reset(bool state);
• sx127x_gpio_read_nirq(void);
• sx127x_delay_ms(uint32_t ms);