164 lines
3.5 KiB
C
164 lines
3.5 KiB
C
/**
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* @file lora.c
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* @author Myth
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* @version 0.1
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* @date 2021.10.15
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* @brief LoRa sx1278 Library for STM32 HAL
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*/
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#include "softspi.h"
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#include "SX1278.h"
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#include "lora.h"
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SX1278_hw_t SX1278_hw;
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SX1278_t SX1278;
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SoftSPI_TypeDef sx1278_spi;
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uint8_t is_in_rx_mode = 0;
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uint8_t LoRa_EnterTxMode(uint8_t len);
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uint8_t LoRa_EnterRxMode(void);
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/**
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* @brief LoRa 模块初始化
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*/
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void LoRa_Init(void)
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{
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//初始化各个引脚
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sx1278_spi.SCLK_GPIO = SX1278_SCLK_GPIO;
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sx1278_spi.SCLK_Pin = SX1278_SCLK_PIN;
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sx1278_spi.MOSI_GPIO = SX1278_MOSI_GPIO;
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sx1278_spi.MOSI_Pin = SX1278_MOSI_PIN;
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sx1278_spi.MISO_GPIO = SX1278_MISO_GPIO;
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sx1278_spi.MISO_Pin = SX1278_MISO_PIN;
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sx1278_spi.SS_GPIO = SX1278_SS_GPIO;
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sx1278_spi.SS_Pin = SX1278_SS_PIN;
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sx1278_spi.Delay_Time = 5;
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SX1278_hw.nss.port = GPIOA;
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SX1278_hw.nss.pin = GPIO_PIN_6;
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SX1278_hw.reset.port = GPIOA;
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SX1278_hw.reset.pin = GPIO_PIN_7;
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SX1278_hw.spi = &sx1278_spi;
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SX1278.hw = &SX1278_hw;
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SoftSPI_Init(&sx1278_spi);
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switch ((uint32_t)(SX1278_RESET_GPIO))
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{
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case (uint32_t)GPIOA:
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{
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GPIO_InitTypeDef GPIO_Initure;
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__HAL_RCC_GPIOA_CLK_ENABLE();
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GPIO_Initure.Pin = SX1278_RESET_PIN;
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GPIO_Initure.Mode = GPIO_MODE_OUTPUT_PP;
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GPIO_Initure.Speed = GPIO_SPEED_FREQ_HIGH;
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HAL_GPIO_Init(GPIOA, &GPIO_Initure);
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}
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break;
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case (uint32_t)GPIOB:
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{
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GPIO_InitTypeDef GPIO_Initure;
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__HAL_RCC_GPIOB_CLK_ENABLE();
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GPIO_Initure.Pin = SX1278_RESET_PIN;
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GPIO_Initure.Mode = GPIO_MODE_OUTPUT_PP;
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GPIO_Initure.Speed = GPIO_SPEED_FREQ_HIGH;
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HAL_GPIO_Init(GPIOB, &GPIO_Initure);
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}
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break;
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case (uint32_t)GPIOC:
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{
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GPIO_InitTypeDef GPIO_Initure;
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__HAL_RCC_GPIOC_CLK_ENABLE();
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GPIO_Initure.Pin = SX1278_RESET_PIN;
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GPIO_Initure.Mode = GPIO_MODE_OUTPUT_PP;
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GPIO_Initure.Speed = GPIO_SPEED_FREQ_HIGH;
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HAL_GPIO_Init(GPIOC, &GPIO_Initure);
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}
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break;
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case (uint32_t)GPIOD:
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{
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GPIO_InitTypeDef GPIO_Initure;
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__HAL_RCC_GPIOD_CLK_ENABLE();
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GPIO_Initure.Pin = SX1278_RESET_PIN;
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GPIO_Initure.Mode = GPIO_MODE_OUTPUT_PP;
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GPIO_Initure.Speed = GPIO_SPEED_FREQ_HIGH;
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HAL_GPIO_Init(GPIOD, &GPIO_Initure);
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}
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}
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SX1278_init(
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&SX1278,
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434000000,
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SX1278_POWER_17DBM,
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SX1278_LORA_SF_7,
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SX1278_LORA_BW_125KHZ,
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SX1278_LORA_CR_4_5,
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SX1278_LORA_CRC_EN,
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255);
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}
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uint8_t LoRa_EnterTxMode(uint8_t len)
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{
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is_in_rx_mode = 0;
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return SX1278_LoRaEntryTx(&SX1278, len, 1000);
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}
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uint8_t LoRa_EnterRxMode(void)
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{
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if (is_in_rx_mode)
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return 1;
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if (SX1278_LoRaEntryRx(&SX1278, 255, 1000))
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is_in_rx_mode = 1;
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return is_in_rx_mode;
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}
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/**
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* @brief LoRa 模块发送
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* @param pdata
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* @param len
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* @retval 发送成功返回 1，发送失败返回 0
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*/
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uint8_t LoRa_Send(uint8_t *pdata, uint8_t len)
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{
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if (LoRa_EnterTxMode(len) == 0)
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return 0;
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SX1278_LoRaTxPacket(&SX1278, pdata, len, 1000); //超时时间无意义，此函数立即返回
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return 1;
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}
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/**
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* @brief LoRa 模块接收
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* @param pdata
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* @retval 接收到包的长度，0 表示未收到数据
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*/
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uint8_t LoRa_Receive(uint8_t *pdata)
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{
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if (LoRa_EnterRxMode() == 0)
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return 0;
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uint8_t len = SX1278_LoRaRxPacket(&SX1278);
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if (len == 0)
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return 0;
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SX1278_read(&SX1278, pdata, len);
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return len;
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}
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