Kconfig

@@ -0,0 +1,47 @@
+menuconfig LORA32_ENABLED
+    bool "LORA32"
+    default y
+    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
+
+config LORA32_MISO_PIN
+	int "GPIO to handle MISO"
+        depends on LORA32_ENABLED
+	default 19
+	help
+		GPIO to handle MISO
+
+config LORA32_MOSI_PIN
+	int "GPIO to handle MOSI"
+        depends on LORA32_ENABLED
+	default 27
+	help
+		GPIO to handle MOSI
+
+config LORA32_CLK_PIN
+	int "GPIO to handle CLK"
+        depends on LORA32_ENABLED
+	default 5
+	help
+		GPIO to handle CLK

include/esp32-lora.h

@@ -77,8 +77,6 @@
 
 #define EV_DIO0 (1 << 0)
 
-#define ERR_LOR_VERSION_MISMATCH (01)
-
 enum freq {
   F433, F866, F915
 } lora32_freq;
@@ -90,12 +88,10 @@ typedef enum {
 const long long frequencies[3];
 const long bandwidths[10];
 
-typedef struct lora32_cfg_t lora32_cfg_t;
+typedef void (*receiveCallback)(uint8_t size);
-
+typedef void (*txdoneCallback)();
-typedef void (*receiveCallback)(lora32_cfg_t *lora, uint8_t size);
+typedef void (*cadDoneCallback)(bool detected);
-typedef void (*txdoneCallback)(lora32_cfg_t *lora);
+typedef void (*cadDetectedCallback)();
-typedef void (*cadDoneCallback)(lora32_cfg_t *lora, bool detected);
-typedef void (*cadDetectedCallback)(lora32_cfg_t *lora);
 
 typedef struct {
   EventGroupHandle_t events;
@@ -103,9 +99,6 @@ typedef struct {
 
 typedef struct lora32_cfg_t {
   uint8_t nss;
-  uint8_t cipo;
-  uint8_t copi;
-  uint8_t clk;
   uint8_t dio0;
   uint8_t reset;
   uint8_t fifoIdx;
@@ -125,28 +118,23 @@ typedef struct lora32_cfg_t {
   cadDoneCallback cad_done;
   cadDetectedCallback cad_detected;
 
-  uint8_t spi_host;
   spi_device_handle_t spi;
 
   lora32_handle_t handle;
 } lora32_cfg_t;
 
-uint8_t lora32_spi_init(lora32_cfg_t *config);
+lora32_cfg_t lora32_create();
 uint8_t lora32_init(lora32_cfg_t *config);
 uint8_t lora32_data_available(lora32_cfg_t *lora);
 
 double lora32_calc_datarate(lora32_cfg_t *lora);
 void lora32_dump_regs(lora32_cfg_t *lora);
 void lora32_enable_continuous_rx(lora32_cfg_t *lora);
-void lora32_enable_single_rx(lora32_cfg_t *lora);
 void lora32_enable_cad(lora32_cfg_t *lora);
-void lora32_toggle_reset(lora32_cfg_t *lora);
 void lora32_send(lora32_cfg_t *config, uint8_t *data, uint8_t len);
 void lora32_set_bandwidth(lora32_cfg_t *lora, uint8_t bw);
 void lora32_set_coding_rate(lora32_cfg_t *lora, uint8_t cr);
 void lora32_set_spreadfactor(lora32_cfg_t *lora, uint8_t factor);
 void lora32_read_data(lora32_cfg_t *lora, uint8_t *data);
-void lora32_sleep(lora32_cfg_t *lora);
-void lora32_standby(lora32_cfg_t *lora);
 
 #endif // _LORA32_H__

main/esp32-lora.c

@@ -2,7 +2,6 @@
 #include <math.h>
 
 #include "freertos/FreeRTOS.h"
-#include "freertos/semphr.h"
 #include "freertos/task.h"
 #include "freertos/queue.h"
 
@@ -11,13 +10,16 @@
 #include "driver/gpio.h"
 #include "driver/spi_common.h"
 #include "driver/spi_master.h"
-#include "driver/spi_common_internal.h"
 
 #include "esp32-lora.h"
 
 #define READ_REG     0x7F
 #define WRITE_REG    0x80
 
+#define PIN_NUM_MISO CONFIG_LORA32_MISO_PIN
+#define PIN_NUM_MOSI CONFIG_LORA32_MOSI_PIN
+#define PIN_NUM_CLK  CONFIG_LORA32_CLK_PIN
+
 #define PA_OUTPUT_RFO_PIN      0
 #define PA_OUTPUT_PA_BOOST_PIN 1
 
@@ -26,13 +28,45 @@ const long bandwidths[] = { 7.8e3, 10.4e3, 15.6e3, 20.8e3, 31.25e3, 41.7e3, 62.5
 
 const char *TAG = "LoRa32";
 
-static QueueHandle_t dio_event_queue;
+lora32_cfg_t lora32_create() {
-static TaskHandle_t dio_task_handle;
+  static spi_device_handle_t spi;
-static SemaphoreHandle_t spi_semaphore;
+
+  return (lora32_cfg_t){
+    .bandwidth = B125,
+    .codingRate = DEFAULT_CR,
+    .dio0 = CONFIG_LORA32_DIO0_PIN,
+    .implicitHeader = false,
+    .nss = CONFIG_LORA32_NSS_PIN,
+    .reset = CONFIG_LORA32_RESET_PIN,
+    .frequency = 915000000,
+    .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) {
-  xSemaphoreTake(spi_semaphore, portMAX_DELAY);
-
 	spi_transaction_t t;
   memset(&t, 0, sizeof(spi_transaction_t));
 
@@ -45,14 +79,10 @@ uint8_t lora32_read_reg(lora32_cfg_t *lora, uint8_t address) {
 
   ESP_LOGV(TAG, "<%2X<%2X", address, t.rx_data[1]);
 
-  xSemaphoreGive(spi_semaphore);
-
 	return t.rx_data[1];
 }
 
 void lora32_write_reg(lora32_cfg_t *lora, uint8_t address, uint8_t value) {
-  xSemaphoreTake(spi_semaphore, portMAX_DELAY);
-
   spi_device_handle_t spi = lora->spi;
 
   spi_transaction_t t;
@@ -66,8 +96,6 @@ void lora32_write_reg(lora32_cfg_t *lora, uint8_t address, uint8_t value) {
   t.tx_data[1] = value;
 
   ESP_ERROR_CHECK(spi_device_transmit(spi, &t));
-
-  xSemaphoreGive(spi_semaphore);
 };
 
 double lora32_calc_datarate(lora32_cfg_t *lora) {
@@ -80,35 +108,31 @@ double lora32_calc_datarate(lora32_cfg_t *lora) {
 }
 
 void lora23_set_explicit_header(lora32_cfg_t *lora) {
-  ESP_LOGD(TAG, "setting explicit header");
-
   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) {
-  ESP_LOGD(TAG, "setting implicit header");
-
   lora->implicitHeader = true;
 
   lora32_write_reg(lora, REG_MODEM_CONFIG_1, lora32_read_reg(lora, REG_MODEM_CONFIG_1) | 0x01);
 }
 
-void lora32_standby(lora32_cfg_t *lora) {
+void lora32_idle(lora32_cfg_t *lora) {
-  ESP_LOGV(TAG, "MODE_STANDBY");
+  ESP_LOGD(TAG, "MODE_STANDBY");
 
   lora32_write_reg(lora, REG_OP_MODE, MODE_LONG_RANGE_MODE | MODE_STANDBY);
 }
 
 void lora32_sleep(lora32_cfg_t *lora) {
-  ESP_LOGV(TAG, "MODE_SLEEP");
+  ESP_LOGD(TAG, "MODE_SLEEP");
 
   lora32_write_reg(lora, REG_OP_MODE, MODE_LONG_RANGE_MODE | MODE_SLEEP);
 }
 
 void lora32_enable_tx(lora32_cfg_t *lora) {
-  lora32_standby(lora);
+  lora32_idle(lora);
 
   if(lora->implicitHeader)
     lora23_set_implicit_header(lora);
@@ -121,8 +145,6 @@ void lora32_enable_tx(lora32_cfg_t *lora) {
 }
 
 void lora32_send(lora32_cfg_t *lora, uint8_t *data, uint8_t len) {
-  ESP_ERROR_CHECK(spi_device_acquire_bus(lora->spi, portMAX_DELAY));
-
   lora32_write_reg(lora, REG_DIO_MAPPING_1, DIO0_MODE_TXDONE);
 
   lora32_enable_tx(lora);
@@ -134,8 +156,6 @@ void lora32_send(lora32_cfg_t *lora, uint8_t *data, uint8_t len) {
   lora32_write_reg(lora, REG_PAYLOAD_LENGTH, len);
 
   lora32_write_reg(lora, REG_OP_MODE, MODE_LONG_RANGE_MODE | MODE_TX);
-
-  spi_device_release_bus(lora->spi);
 }
 
 void lora32_set_frequency(lora32_cfg_t *lora, long frequency) {
@@ -250,18 +270,6 @@ void lora32_set_spreadfactor(lora32_cfg_t *lora, uint8_t factor) {
   lora32_write_reg(lora, REG_MODEM_CONFIG_2, (lora32_read_reg(lora, REG_MODEM_CONFIG_2) & 0x0F) | ((factor << 4) & 0xF0));
 }
 
-void lora32_enable_single_rx(lora32_cfg_t *lora) {
-  ESP_LOGD(TAG, "MODE_RX_SINGLE");
-
-  if(lora->receive != NULL) {
-    lora32_write_reg(lora, REG_DIO_MAPPING_1, DIO0_MODE_RXDONE);
-  }
-
-  lora32_standby(lora);
-
-  lora32_write_reg(lora, REG_OP_MODE, MODE_LONG_RANGE_MODE | MODE_RX_SINGLE);
-}
-
 void lora32_enable_continuous_rx(lora32_cfg_t *lora) {
   ESP_LOGD(TAG, "MODE_RX_CONTINUOUS");
 
@@ -269,8 +277,6 @@ void lora32_enable_continuous_rx(lora32_cfg_t *lora) {
     lora32_write_reg(lora, REG_DIO_MAPPING_1, DIO0_MODE_RXDONE);
   }
 
-  lora32_standby(lora);
-
   lora32_write_reg(lora, REG_OP_MODE, MODE_LONG_RANGE_MODE | MODE_RX_CONTINUOUS);
 }
 
@@ -354,40 +360,35 @@ static void lora32_handle_receive(lora32_cfg_t *lora) {
 
   lora32_write_reg(lora, REG_FIFO_ADDR_PTR, fifo_addr);
 
-  lora->receive(lora, len);
+  lora->receive(len);
 }
 
-static void IRAM_ATTR lora32_dio_task(void *arg) {
+static void IRAM_ATTR lora32_dio0_task(void *arg) {
-  // allocate lora32_cfg_t to receive config from Queu
+  lora32_cfg_t *lora = (lora32_cfg_t*)arg;
-  lora32_cfg_t *lora = malloc(sizeof(lora32_cfg_t));
+  ESP_LOGD(TAG, "starting DIO0 handler task");
-  ESP_LOGI(TAG, "starting DIO handler task");
 
   while(1) {
-    // wait for event over Queue
+		EventBits_t evbits = xEventGroupWaitBits(lora->handle.events, EV_DIO0, pdTRUE, pdFALSE, 5000 / portTICK_PERIOD_MS);
-    if(xQueueReceive(dio_event_queue, (void*)lora, portMAX_DELAY) != pdPASS) continue;
 
-    // need a better way to log which event and from which config
+    // timed out, loop and continue to wait
-    //ESP_LOGI(TAG, "handling DIO0 on GPIO%d", lora->dio0);
+    if(evbits == 0) continue;
 
-    spi_device_acquire_bus(lora->spi, portMAX_DELAY);
+    ESP_LOGD(TAG, "handling DIO0");
 
     // read IRQ flags
     uint8_t irqs = lora32_read_reg(lora, REG_IRQ_FLAGS);
     ESP_LOGD(TAG, "reading irqs: %02X", irqs);
-
+    // clear IRQ flags
-    // clear IRQ flags by writing mask back
     ESP_LOGD(TAG, "clearing irqs");
     lora32_write_reg(lora, REG_IRQ_FLAGS, irqs);
 
-    spi_device_release_bus(lora->spi);
-
     // TODO handle header validation
     if((irqs & IRQ_RX_DONE) == IRQ_RX_DONE) {
       lora32_handle_receive(lora);
     }
 
     if((irqs & IRQ_TX_DONE) == IRQ_TX_DONE) {
-      if(lora->tx_done != NULL) lora->tx_done(lora);
+      if(lora->tx_done != NULL) lora->tx_done();
     }
 
     bool cad_detected = false;
@@ -397,13 +398,13 @@ static void IRAM_ATTR lora32_dio_task(void *arg) {
       cad_detected = true;
 
       // no need for arg, cad_detected callback is always presummed true
-      if(lora->cad_detected != NULL) lora->cad_detected(lora);
+      if(lora->cad_detected != NULL) lora->cad_detected();
     }
 
     if((irqs & IRQ_CAD_DONE) == IRQ_CAD_DONE) {
       // cad_done gets true/false from above, when activity is detected
       // these *should* fire at the same time, defaults to false
-      if(lora->cad_done != NULL) lora->cad_done(lora, cad_detected);
+      if(lora->cad_done != NULL) lora->cad_done(cad_detected);
     }
   }
 }
@@ -420,35 +421,12 @@ void lora32_read_data(lora32_cfg_t *lora, uint8_t *data) {
 }
 
 static void IRAM_ATTR lora32_on_dio0(void *arg) {
-  xQueueSend(dio_event_queue, arg, (TickType_t)0);
+  BaseType_t woken = pdFALSE;
-}
 
-uint8_t lora32_spi_init(lora32_cfg_t *lora) {
+  xEventGroupSetBitsFromISR(((lora32_cfg_t*)arg)->handle.events, EV_DIO0, &woken);
-  ESP_LOGI(TAG, "Initializing SPI bus");
-
-  esp_err_t err = ESP_OK;
-
-  spi_bus_config_t buscfg = {
-    .miso_io_num = lora->cipo,
-    .mosi_io_num = lora->copi,
-    .sclk_io_num = lora->clk,
-    .quadwp_io_num = -1,
-    .quadhd_io_num = -1
-  };
-
-  if(spi_bus_get_attr(lora->spi_host) == NULL) {
-    // 2 should be SPI_DMA_CH_AUTO ??? but it doesn't seem to be defined
-    err = spi_bus_initialize(lora->spi_host, &buscfg, 2);
-  }
-
-  return err;
 }
 
 uint8_t lora32_init(lora32_cfg_t *lora) {
-  if(spi_semaphore == NULL) {
-    spi_semaphore = xSemaphoreCreateMutex();
-  }
-
   gpio_config_t io_conf;
   io_conf.intr_type = GPIO_PIN_INTR_DISABLE;
   io_conf.mode = GPIO_MODE_OUTPUT;
@@ -465,7 +443,19 @@ uint8_t lora32_init(lora32_cfg_t *lora) {
 
   vTaskDelay(10 / portTICK_PERIOD_MS);
 
-  // SPI device setup
+  // init spi
+  ESP_LOGI(TAG, "Initializing SPI bus");
+  // TODO fix this awkward log along with pin assignments in general
+  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,
@@ -474,20 +464,15 @@ uint8_t lora32_init(lora32_cfg_t *lora) {
     .queue_size = 7,
   };
 
-  ESP_ERROR_CHECK(spi_bus_add_device(lora->spi_host, &devcfg, &lora->spi));
+  ESP_ERROR_CHECK(spi_bus_initialize(HSPI_HOST, &buscfg, 0));
+  ESP_ERROR_CHECK(spi_bus_add_device(HSPI_HOST, &devcfg, &lora->spi));
 
   // initialize event groups
   lora->handle.events = xEventGroupCreate();
 
   uint8_t version = lora32_read_reg(lora, REG_VERSION);
   ESP_LOGD(TAG, "lora32_get_id() == 0x%2X", version);
-
+  assert(version == 0x12);
-  // if ID does not match, something is likely wrong on the SPI bus
-  if(version != 0x12) {
-    ESP_LOGD(TAG, "REG_VERSION returned incorrectly. Expected 0x12 got 0x%02X", version);
-
-    return ERR_LOR_VERSION_MISMATCH;
-  }
 
   // TODO: confirm this is happening. Before/after power measurements?
   lora32_sleep(lora);
@@ -512,43 +497,27 @@ uint8_t lora32_init(lora32_cfg_t *lora) {
   lora32_set_tx_power(lora, 17, PA_OUTPUT_PA_BOOST_PIN);
   ESP_LOGI(TAG, "lora32_set_tx_power");
 
-  lora32_standby(lora);
+  lora32_idle(lora);
-  ESP_LOGI(TAG, "lora32_standby");
+  ESP_LOGI(TAG, "lora32_idle");
-
-  if(lora->implicitHeader)
-    lora23_set_implicit_header(lora);
-  else
-    lora23_set_explicit_header(lora);
 
   // TODO setup shouldn't be based on just receive callback
   if(lora->receive != NULL) {
-    ESP_LOGI(TAG, "Setting GPIO Interrupt");
+    ESP_LOGI(TAG, "Setting callback handler");
 
     io_conf.intr_type = GPIO_PIN_INTR_POSEDGE;
-    io_conf.pin_bit_mask = (1ULL << lora->dio0);
+    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(lora->dio0, GPIO_INTR_POSEDGE);
+    gpio_set_intr_type(CONFIG_LORA32_DIO0_PIN, GPIO_INTR_POSEDGE);
-
-    // the DIO interrupt handling for every device is done from one task
-    if(dio_task_handle == NULL) {
-      ESP_LOGI(TAG, "Setting callback handler and ISR service");
-
-      // enable global ISR service
     gpio_install_isr_service(0);
 
-      dio_event_queue = xQueueCreate(10, sizeof(lora32_cfg_t));
+    gpio_isr_handler_add(CONFIG_LORA32_DIO0_PIN, lora32_on_dio0, (void*)lora);
 
     // this should probably be high priority
-      xTaskCreate(&lora32_dio_task, "lora32_dio_task", 4096, NULL, 6, &dio_task_handle);
+    xTaskCreate(&lora32_dio0_task, "lora32_dio0_task", 14048, (void*)lora, 6, NULL);
-    }
-
-    // add ISR handler to the global service started (once) above
-    ESP_LOGI(TAG, "Installing ISR handler for GPIO%d", lora->dio0);
-    gpio_isr_handler_add(lora->dio0, lora32_on_dio0, lora);
   }
 
   return 1;