CYW43XXX: Add generic transport layer

Author: facchinm

connectivity/drivers/ble/FEATURE_BLE/COMPONENT_CYW43XXX/CyH4TransportDriver.cpp

@@ -20,7 +20,9 @@
 #include "CyH4TransportDriver.h"
 #include "mbed_power_mgmt.h"
 #include "drivers/InterruptIn.h"
+#if !defined(CYW43XXX_UNBUFFERED_UART)
 #include "cybsp_types.h"
+#endif
 #include "Callback.h"
 #include "rtos/ThisThread.h"
 #include <chrono>
@@ -32,8 +34,12 @@ namespace cypress_ble {
 using namespace std::chrono_literals;
 
 CyH4TransportDriver::CyH4TransportDriver(PinName tx, PinName rx, PinName cts, PinName rts, PinName bt_power_name, int baud, PinName bt_host_wake_name, PinName bt_device_wake_name, uint8_t host_wake_irq, uint8_t dev_wake_irq) :
-    cts(cts), rts(rts),
+#if defined(CYW43XXX_UNBUFFERED_UART)
+    uart(tx, rx),
+#else
     tx(tx), rx(rx),
+#endif
+    cts(cts), rts(rts),
     bt_host_wake_name(bt_host_wake_name),
     bt_device_wake_name(bt_device_wake_name),
     bt_power(bt_power_name, PIN_OUTPUT, PullNone, 0),
@@ -47,10 +53,13 @@ CyH4TransportDriver::CyH4TransportDriver(PinName tx, PinName rx, PinName cts, Pi
     bt_host_wake_active = false;
 }
 
-CyH4TransportDriver::CyH4TransportDriver(PinName tx, PinName rx, PinName cts, PinName rts,  PinName bt_power_name, int baud) :
-    cts(cts),
-    rts(rts),
+CyH4TransportDriver::CyH4TransportDriver(PinName tx, PinName rx, PinName cts, PinName rts, PinName bt_power_name, int baud) :
+#if defined(CYW43XXX_UNBUFFERED_UART)
+    uart(tx, rx),
+#else
     tx(tx), rx(rx),
+#endif
+    cts(cts), rts(rts),
     bt_host_wake_name(NC),
     bt_device_wake_name(NC),
     bt_power(bt_power_name, PIN_OUTPUT, PullNone, 0),
@@ -107,16 +116,31 @@ void CyH4TransportDriver::bt_host_wake_fall_irq_handler(void)
     }
 }
 
+#if defined(CYW43XXX_UNBUFFERED_UART)
+void CyH4TransportDriver::on_controller_irq()
+#else
 static void on_controller_irq(void *callback_arg, cyhal_uart_event_t event)
+#endif
 {
+#if !defined(CYW43XXX_UNBUFFERED_UART)
     (void)(event);
     cyhal_uart_t *uart_obj = (cyhal_uart_t *)callback_arg;
+#endif
+
     sleep_manager_lock_deep_sleep();
 
+#if defined(CYW43XXX_UNBUFFERED_UART)
+    while (uart.readable()) {
+        uint8_t char_received;
+        if (uart.read(&char_received, 1)) {
+            CordioHCITransportDriver::on_data_received(&char_received, 1);
+        }
+#else
     while (cyhal_uart_readable(uart_obj)) {
         uint8_t char_received;
         cyhal_uart_getc(uart_obj, &char_received, 0);
         CyH4TransportDriver::on_data_received(&char_received, 1);
+#endif
     }
 
     sleep_manager_unlock_deep_sleep();
@@ -129,6 +153,26 @@ void CyH4TransportDriver::initialize()
     bt_power = 0;
     rtos::ThisThread::sleep_for(1ms);
 
+#if defined(CYW43XXX_UNBUFFERED_UART)
+    uart.baud(DEF_BT_BAUD_RATE);
+
+    uart.format(
+        /* bits */ 8,
+        /* parity */ mbed::SerialBase::None,
+        /* stop bit */ 1
+    );
+
+    uart.set_flow_control(
+        /* flow */ mbed::SerialBase::RTSCTS,
+        /* rts */ rts,
+        /* cts */ cts
+    );
+
+    uart.attach(
+        mbed::callback(this, &CyH4TransportDriver::on_controller_irq),
+        mbed::SerialBase::RxIrq
+    );
+#else
     cyhal_uart_init(&uart, tx, rx, NULL, NULL);
 
     const cyhal_uart_cfg_t uart_cfg = { .data_bits = 8, .stop_bits = 1, .parity = CYHAL_UART_PARITY_NONE, .rx_buffer = NULL, .rx_buffer_size = 0 };
@@ -137,6 +181,7 @@ void CyH4TransportDriver::initialize()
     cyhal_uart_clear(&uart);
     cyhal_uart_register_callback(&uart, &on_controller_irq, &uart);
     cyhal_uart_enable_event(&uart, CYHAL_UART_IRQ_RX_NOT_EMPTY, CYHAL_ISR_PRIORITY_DEFAULT, true);
+#endif
 
     bt_power = 1;
 
@@ -160,6 +205,7 @@ void CyH4TransportDriver::initialize()
 
 void CyH4TransportDriver::terminate()
 {
+#if !defined(CYW43XXX_UNBUFFERED_UART)
     cyhal_uart_event_t enable_irq_event = (cyhal_uart_event_t)(CYHAL_UART_IRQ_RX_DONE
                                        | CYHAL_UART_IRQ_TX_DONE
                                        | CYHAL_UART_IRQ_RX_NOT_EMPTY
@@ -170,6 +216,7 @@ void CyH4TransportDriver::terminate()
                             CYHAL_ISR_PRIORITY_DEFAULT,
                             false
                         );
+#endif
 
     if(bt_host_wake.is_connected())
     {
@@ -182,7 +229,11 @@ void CyH4TransportDriver::terminate()
 
     bt_power = 0; //BT_POWER is an output, should not be freed only set inactive
 
+#if defined(CYW43XXX_UNBUFFERED_UART)
+    uart.close();
+#else
     cyhal_uart_free(&uart);
+#endif
 }
 
 uint16_t CyH4TransportDriver::write(uint8_t type, uint16_t len, uint8_t *pData)
@@ -194,11 +245,20 @@ uint16_t CyH4TransportDriver::write(uint8_t type, uint16_t len, uint8_t *pData)
 
     while (i < len + 1) {
         uint8_t to_write = i == 0 ? type : pData[i - 1];
+#if defined(CYW43XXX_UNBUFFERED_UART)
+        while (uart.writeable() == 0);
+        uart.write(&to_write, 1);
+#else
         while (cyhal_uart_writable(&uart) == 0);
         cyhal_uart_putc(&uart, to_write);
+#endif
         ++i;
     }
+#if defined(CYW43XXX_UNBUFFERED_UART)
+    while (uart.writeable() == 0);
+#else
     while(cyhal_uart_is_tx_active(&uart));
+#endif
 
     deassert_bt_dev_wake();
     sleep_manager_unlock_deep_sleep();
@@ -234,8 +294,12 @@ void CyH4TransportDriver::deassert_bt_dev_wake()
 
 void CyH4TransportDriver::update_uart_baud_rate(int baud)
 {
+#if defined(CYW43XXX_UNBUFFERED_UART)
+    uart.baud((uint32_t)baud);
+#else
     uint32_t ignore;
     cyhal_uart_set_baud(&uart, (uint32_t)baud, &ignore);
+#endif
 }
 
 bool CyH4TransportDriver::get_enabled_powersave()

connectivity/drivers/ble/FEATURE_BLE/COMPONENT_CYW43XXX/CyH4TransportDriver.h

@@ -24,7 +24,12 @@
 #include "ble/driver/CordioHCITransportDriver.h"
 #include "drivers/DigitalInOut.h"
 #include "drivers/InterruptIn.h"
+
+#if defined(CYW43XXX_UNBUFFERED_UART)
+#include "drivers/UnbufferedSerial.h"
+#else
 #include "cyhal_uart.h"
+#endif
 
 namespace ble {
 namespace vendor {
@@ -81,6 +86,10 @@ class CyH4TransportDriver : public CordioHCITransportDriver {
 private:
     void assert_bt_dev_wake();
     void deassert_bt_dev_wake();
+	
+#if defined(CYW43XXX_UNBUFFERED_UART)
+    void on_controller_irq();
+#endif
 
     // Use HAL serial because Cypress UART is buffered.
     // The PUTC function does not actually blocks until data is fully transmitted,
@@ -89,12 +98,15 @@ class CyH4TransportDriver : public CordioHCITransportDriver {
     // However UART APIs does not prevent the BT radio from going to sleep.
     // Use the HAL APIs to prevent the radio from going to sleep until UART transmition is complete.
     // Mbed layer has no API that distinguish between data in HW buffer v.s. data already transmitted.
-
+#if defined(CYW43XXX_UNBUFFERED_UART)
+    mbed::UnbufferedSerial uart;
+#else
     cyhal_uart_t uart;
-    PinName cts;
-    PinName rts;
+#endif
     PinName tx;
     PinName rx;
+    PinName cts;
+    PinName rts;
     PinName bt_host_wake_name;
     PinName bt_device_wake_name;