Fix nRF UART reset

ports/nrf/common-hal/busio/I2C.c

@@ -63,7 +63,7 @@ void i2c_reset(void) {
         if (never_reset[i]) {
             continue;
         }
-        nrf_twim_disable(twim_peripherals[i].twim.p_twim);
+        nrfx_twim_uninit(&twim_peripherals[i].twim);
         twim_peripherals[i].in_use = false;
     }
 }
@@ -150,13 +150,6 @@ void common_hal_busio_i2c_construct(busio_i2c_obj_t *self, const mcu_pin_obj_t *
     // About to init. If we fail after this point, common_hal_busio_i2c_deinit() will set in_use to false.
     self->twim_peripheral->in_use = true;
     nrfx_err_t err = nrfx_twim_init(&self->twim_peripheral->twim, &config, NULL, NULL);
-
-    // A soft reset doesn't uninit the driver so we might end up with a invalid state
-    if (err == NRFX_ERROR_INVALID_STATE) {
-        nrfx_twim_uninit(&self->twim_peripheral->twim);
-        err = nrfx_twim_init(&self->twim_peripheral->twim, &config, NULL, NULL);
-    }
-
     if (err != NRFX_SUCCESS) {
         common_hal_busio_i2c_deinit(self);
         mp_raise_OSError(MP_EIO);

ports/nrf/common-hal/busio/SPI.c

@@ -68,7 +68,7 @@ void spi_reset(void) {
         if (never_reset[i]) {
             continue;
         }
-        nrf_spim_disable(spim_peripherals[i].spim.p_reg);
+        nrfx_spim_uninit(&spim_peripherals[i].spim);
     }
 }
 
@@ -160,13 +160,6 @@ void common_hal_busio_spi_construct(busio_spi_obj_t *self, const mcu_pin_obj_t *
     }
 
     nrfx_err_t err = nrfx_spim_init(&self->spim_peripheral->spim, &config, NULL, NULL);
-
-    // A soft reset doesn't uninit the driver so we might end up with a invalid state
-    if (err == NRFX_ERROR_INVALID_STATE) {
-        nrfx_spim_uninit(&self->spim_peripheral->spim);
-        err = nrfx_spim_init(&self->spim_peripheral->spim, &config, NULL, NULL);
-    }
-
     if (err != NRFX_SUCCESS) {
         common_hal_busio_spi_deinit(self);
         mp_raise_OSError(MP_EIO);

ports/nrf/common-hal/busio/UART.c

@@ -124,7 +124,7 @@ static void uart_callback_irq (const nrfx_uarte_event_t * event, void * context)
 
 void uart_reset(void) {
     for (size_t i = 0 ; i < MP_ARRAY_SIZE(nrfx_uartes); i++) {
-        nrf_uarte_disable(nrfx_uartes[i].p_reg);
+        nrfx_uarte_uninit(&nrfx_uartes[i]);
     }
 }
 
@@ -171,7 +171,6 @@ void common_hal_busio_uart_construct (busio_uart_obj_t *self,
         }
     };
 
-    nrfx_uarte_uninit(self->uarte);
     _VERIFY_ERR(nrfx_uarte_init(self->uarte, &config, uart_callback_irq));
 
     // Init buffer for rx

ports/nrf/common-hal/neopixel_write/__init__.c

@@ -130,7 +130,17 @@ void common_hal_neopixel_write (const digitalio_digitalinout_obj_t* digitalinout
         if (pattern_size <= sizeof(one_pixel)) {
             pixels_pattern = (uint16_t *) one_pixel;
         } else {
-            pixels_pattern = (uint16_t *) m_malloc_maybe(pattern_size, false);
+            uint8_t sd_en = 0;
+            (void) sd_softdevice_is_enabled(&sd_en);
+            if (sd_en) {
+                // If the soft device is enabled then we must use PWM to
+                // transmit. This takes a bunch of memory to do so raise an
+                // exception if we can't.
+                pixels_pattern = (uint16_t *) m_malloc(pattern_size, false);
+            } else {
+                pixels_pattern = (uint16_t *) m_malloc_maybe(pattern_size, false);
+            }
+
             pattern_on_heap = true;
         }
     }