refactor(example/bt): Refactor controller_hci_uart example for ESP32-C3/S3 to use UHCI driver

examples/bluetooth/hci/controller_hci_uart_esp32c3_and_esp32s3/main/CMakeLists.txt

@@ -1,3 +1,3 @@
 idf_component_register(SRCS "main.c"
-                    PRIV_REQUIRES bt nvs_flash esp_driver_uart esp_driver_gpio
+                    PRIV_REQUIRES bt nvs_flash esp_driver_uart esp_ringbuf
                     INCLUDE_DIRS "")

examples/bluetooth/hci/controller_hci_uart_esp32c3_and_esp32s3/main/main.c

@@ -5,12 +5,10 @@
  */
 
 #include <string.h>
-#include "esp_private/periph_ctrl.h" // for enabling UHCI module, remove it after UHCI driver is released
+#include "freertos/FreeRTOS.h"
-#include "driver/gpio.h"
+#include "freertos/ringbuf.h"
 #include "driver/uart.h"
-#include "soc/lldesc.h"
+#include "driver/uhci.h"
-#include "esp_private/gdma.h"
-#include "hal/uhci_ll.h"
 #include "nvs_flash.h"
 #include "esp_bt.h"
 #include "esp_log.h"
@@ -21,6 +19,9 @@ static const char *tag = "UHCI";
 
 #define UART_RX_THRS       (120)
 
+#define UHCI_MAX_RX_BUFFER_SIZE (512)
+#define UHCI_MAX_TX_BUFFER_SIZE (512)
+
 #define GPIO_UART_TXD_OUT  (4)
 #define GPIO_UART_RXD_IN   (5)
 #define GPIO_UART_RTS_OUT  (6)
@@ -41,19 +42,21 @@ static void hci_uart_tl_finish_transfers(void);
 struct uart_txrxchannel {
     esp_bt_hci_tl_callback_t callback;
     void *arg;
-    lldesc_t link;
+    uint8_t *buf;
+    uint32_t size;
 };
 
 struct uart_env_tag {
     struct uart_txrxchannel tx;
     struct uart_txrxchannel rx;
+    uhci_controller_handle_t uhci_handle;
+    SemaphoreHandle_t rx_process_sema;
+    RingbufHandle_t ringbufhandle;
+    volatile bool rx_eof;
+    uint8_t rx_data_buffer[UHCI_MAX_RX_BUFFER_SIZE];
 };
 
-struct uart_env_tag uart_env;
+static struct uart_env_tag uart_env = {0};
-
-static uhci_dev_t *s_uhci_hw = &UHCI0;
-static gdma_channel_handle_t s_rx_channel;
-static gdma_channel_handle_t s_tx_channel;
 
 static esp_bt_hci_tl_t s_hci_uart_tl_funcs = {
     ._magic = ESP_BT_HCI_TL_MAGIC_VALUE,
@@ -82,16 +85,13 @@ static IRAM_ATTR void hci_uart_tl_recv_async(uint8_t *buf, uint32_t size, esp_bt
     assert(buf != NULL);
     assert(size != 0);
     assert(callback != NULL);
+
     uart_env.rx.callback = callback;
     uart_env.rx.arg = arg;
+    uart_env.rx.size = size;
+    uart_env.rx.buf = buf;
 
-    memset(&uart_env.rx.link, 0, sizeof(lldesc_t));
+    xSemaphoreGive(uart_env.rx_process_sema);
-    uart_env.rx.link.buf = buf;
-    uart_env.rx.link.size = size;
-
-    s_uhci_hw->pkt_thres.thrs = size;
-
-    gdma_start(s_rx_channel, (intptr_t)(&uart_env.rx.link));
 }
 
 static IRAM_ATTR void hci_uart_tl_send_async(uint8_t *buf, uint32_t size, esp_bt_hci_tl_callback_t callback, void *arg)
@@ -102,13 +102,11 @@ static IRAM_ATTR void hci_uart_tl_send_async(uint8_t *buf, uint32_t size, esp_bt
 
     uart_env.tx.callback = callback;
     uart_env.tx.arg = arg;
+    uart_env.tx.size = size;
 
-    memset(&uart_env.tx.link, 0, sizeof(lldesc_t));
+    if (uhci_transmit(uart_env.uhci_handle, buf, size) != ESP_OK) {
-    uart_env.tx.link.length = size;
+        assert(0);
-    uart_env.tx.link.buf = buf;
+    }
-    uart_env.tx.link.eof = 1;
-
-    gdma_start(s_tx_channel, (intptr_t)(&uart_env.tx.link));
 }
 
 static void hci_uart_tl_flow_on(void)
@@ -124,36 +122,18 @@ static void hci_uart_tl_finish_transfers(void)
 {
 }
 
-static IRAM_ATTR bool hci_uart_tl_rx_eof_callback(gdma_channel_handle_t dma_chan, gdma_event_data_t *event_data, void *user_data)
+static IRAM_ATTR bool uhci_tx_done_cb(uhci_controller_handle_t uhci_ctrl,
+                                          const uhci_tx_done_event_data_t *edata, void *user_ctx)
 {
-    assert(dma_chan == s_rx_channel);
-    assert(uart_env.rx.callback != NULL);
-    esp_bt_hci_tl_callback_t callback = uart_env.rx.callback;
-    void *arg = uart_env.rx.arg;
-
-    // clear callback pointer
-    uart_env.rx.callback = NULL;
-    uart_env.rx.arg = NULL;
-
-    // call handler
-    callback(arg, ESP_BT_HCI_TL_STATUS_OK);
-
-    // send notification to Bluetooth Controller task
-    esp_bt_h4tl_eif_io_event_notify(1);
-
-    return true;
-}
-
-static IRAM_ATTR bool hci_uart_tl_tx_eof_callback(gdma_channel_handle_t dma_chan, gdma_event_data_t *event_data, void *user_data)
-{
-    assert(dma_chan == s_tx_channel);
     assert(uart_env.tx.callback != NULL);
+    assert(uart_env.tx.size == edata->sent_size);
     esp_bt_hci_tl_callback_t callback = uart_env.tx.callback;
     void *arg = uart_env.tx.arg;
 
     // clear callback pointer
     uart_env.tx.callback = NULL;
     uart_env.tx.arg = NULL;
+    uart_env.tx.size = 0;
 
     // call handler
     callback(arg, ESP_BT_HCI_TL_STATUS_OK);
@@ -164,39 +144,71 @@ static IRAM_ATTR bool hci_uart_tl_tx_eof_callback(gdma_channel_handle_t dma_chan
     return true;
 }
 
-static void uart_gpio_set(void)
+static IRAM_ATTR bool uhci_rx_event_cb(uhci_controller_handle_t uhci_ctrl, const uhci_rx_event_data_t *edata, void *user_ctx)
 {
-    gpio_config_t io_output_conf = {
+    BaseType_t done = xRingbufferSendFromISR(uart_env.ringbufhandle, edata->data, edata->recv_size, 0);
-        .intr_type = GPIO_INTR_DISABLE,    //disable interrupt
+    if (!done) {
-        .mode = GPIO_MODE_OUTPUT,    // output mode
+        assert(0);
-        .pin_bit_mask = GPIO_OUTPUT_PIN_SEL,    // bit mask of the output pins
+    }
-        .pull_down_en = GPIO_PULLDOWN_DISABLE,  // disable pull-down mode
+    if (edata->flags.totally_received) {
-        .pull_up_en = GPIO_PULLUP_DISABLE,      // disable pull-up mode
+        uart_env.rx_eof = true;
-    };
+    }
-    gpio_config(&io_output_conf);
 
-    gpio_config_t io_input_conf = {
+    return true;
-        .intr_type = GPIO_INTR_DISABLE,    //disable interrupt
-        .mode = GPIO_MODE_INPUT,    // input mode
-        .pin_bit_mask = GPIO_INPUT_PIN_SEL,  // bit mask of the input pins
-        .pull_down_en = GPIO_PULLDOWN_DISABLE,  // disable pull-down mode
-        .pull_up_en = GPIO_PULLUP_DISABLE,      // disable pull-down mode
-    };
-    gpio_config(&io_input_conf);
-
-    uart_set_pin(UART_HCI_NUM, GPIO_UART_TXD_OUT, GPIO_UART_RXD_IN, GPIO_UART_RTS_OUT, GPIO_UART_CTS_IN);
 }
 
+static void uhci_rx_done_process_task(void *arg)
+{
+    size_t item_size = 0;
+    uint8_t *data = NULL;
+    while (1) {
+        xSemaphoreTake(uart_env.rx_process_sema, portMAX_DELAY);
+        data = xRingbufferReceiveUpTo(uart_env.ringbufhandle, &item_size, portMAX_DELAY, uart_env.rx.size);
+        if (item_size != uart_env.rx.size) {
+            assert(0);
+        }
+        memcpy(uart_env.rx.buf, data, item_size);
+        vRingbufferReturnItem(uart_env.ringbufhandle, data);
+
+        if (uart_env.rx_eof) {
+            uhci_receive(uart_env.uhci_handle, uart_env.rx_data_buffer, UHCI_MAX_RX_BUFFER_SIZE);
+            uart_env.rx_eof = false;
+        }
+
+        assert(uart_env.rx.callback != NULL);
+        esp_bt_hci_tl_callback_t callback = uart_env.rx.callback;
+        void *arg = uart_env.rx.arg;
+
+        // clear callback pointer
+        uart_env.rx.callback = NULL;
+        uart_env.rx.arg = NULL;
+        uart_env.rx.size = 0;
+
+        // call handler
+        callback(arg, ESP_BT_HCI_TL_STATUS_OK);
+
+        // send notification to Bluetooth Controller task
+        esp_bt_h4tl_eif_io_event_notify(1);
+    }
+}
+
+static void uhci_rx_prepare(void)
+{
+    uhci_receive(uart_env.uhci_handle, uart_env.rx_data_buffer, UHCI_MAX_RX_BUFFER_SIZE);
+
+    uart_env.ringbufhandle = xRingbufferCreate(UHCI_MAX_RX_BUFFER_SIZE * 4, RINGBUF_TYPE_BYTEBUF);
+    if (uart_env.ringbufhandle == NULL) {
+        ESP_LOGE(tag, "Ringbuffer create failed");
+        return;
+    }
+
+    uart_env.rx_process_sema = xSemaphoreCreateBinary();
+    xTaskCreate(uhci_rx_done_process_task, "trigger controller task", 4096, NULL, 5, NULL);
+}
+
+
 void uhci_uart_install(void)
 {
-    periph_module_enable(PERIPH_UHCI0_MODULE);
-    periph_module_reset(PERIPH_UHCI0_MODULE);
-
-    periph_module_enable(PERIPH_UART1_MODULE);
-    periph_module_reset(PERIPH_UART1_MODULE);
-
-    uart_gpio_set();
-
     // configure UART1
     uart_config_t uart_config = {
         .baud_rate = CONFIG_EXAMPLE_HCI_UART_BAUDRATE,
@@ -212,45 +224,27 @@ void uhci_uart_install(void)
         .source_clk = UART_SCLK_DEFAULT,
     };
     ESP_ERROR_CHECK(uart_param_config(UART_HCI_NUM, &uart_config));
+    ESP_ERROR_CHECK(uart_set_pin(UART_HCI_NUM, GPIO_UART_TXD_OUT, GPIO_UART_RXD_IN, GPIO_UART_RTS_OUT, GPIO_UART_CTS_IN));
 
-    // install DMA driver
+    uhci_controller_config_t uhci_cfg = {
-    gdma_channel_alloc_config_t tx_channel_config = {
+        .uart_port = UART_HCI_NUM,
-        .flags.reserve_sibling = 1,
+        .tx_trans_queue_depth = 1,
-        .direction = GDMA_CHANNEL_DIRECTION_TX,
+        .max_receive_internal_mem = UHCI_MAX_RX_BUFFER_SIZE,
+        .max_transmit_size = UHCI_MAX_TX_BUFFER_SIZE,
+        .dma_burst_size = 32,
+        .rx_eof_flags.idle_eof = 1,
     };
-    ESP_ERROR_CHECK(gdma_new_ahb_channel(&tx_channel_config, &s_tx_channel));
+
-    gdma_channel_alloc_config_t rx_channel_config = {
+    ESP_ERROR_CHECK(uhci_new_controller(&uhci_cfg, &uart_env.uhci_handle));
-        .direction = GDMA_CHANNEL_DIRECTION_RX,
+
-        .sibling_chan = s_tx_channel,
+    uhci_event_callbacks_t uhci_cbs = {
+        .on_rx_trans_event = uhci_rx_event_cb,
+        .on_tx_trans_done = uhci_tx_done_cb,
     };
-    ESP_ERROR_CHECK(gdma_new_ahb_channel(&rx_channel_config, &s_rx_channel));
 
-    gdma_connect(s_tx_channel, GDMA_MAKE_TRIGGER(GDMA_TRIG_PERIPH_UHCI, 0));
+    ESP_ERROR_CHECK(uhci_register_event_callbacks(uart_env.uhci_handle, &uhci_cbs, NULL));
-    gdma_connect(s_rx_channel, GDMA_MAKE_TRIGGER(GDMA_TRIG_PERIPH_UHCI, 0));
 
-    gdma_strategy_config_t strategy_config = {
+    uhci_rx_prepare();
-        .auto_update_desc = false,
-        .owner_check = false
-    };
-    gdma_apply_strategy(s_tx_channel, &strategy_config);
-    gdma_apply_strategy(s_rx_channel, &strategy_config);
-
-    gdma_rx_event_callbacks_t rx_cbs = {
-        .on_recv_eof = hci_uart_tl_rx_eof_callback
-    };
-    gdma_register_rx_event_callbacks(s_rx_channel, &rx_cbs, NULL);
-
-    gdma_tx_event_callbacks_t tx_cbs = {
-        .on_trans_eof = hci_uart_tl_tx_eof_callback
-    };
-    gdma_register_tx_event_callbacks(s_tx_channel, &tx_cbs, NULL);
-
-    // configure UHCI
-    uhci_ll_init(s_uhci_hw);
-    uhci_ll_rx_set_eof_mode(s_uhci_hw, UHCI_RX_LEN_EOF);
-    // disable software flow control
-    s_uhci_hw->escape_conf.val = 0;
-    uhci_ll_attach_uart_port(s_uhci_hw, 1);
 }