Fix CPBlue LFCLKSRC; CPB has no status neopixel

ports/nrf/boards/circuitplayground_bluefruit/mpconfigboard.h

@@ -34,8 +34,6 @@
 #define FLASH_SIZE                  (0x100000)
 #define FLASH_PAGE_SIZE             (4096)
 
-#define MICROPY_HW_NEOPIXEL         (&pin_P0_13)
-
 #define MICROPY_HW_LED_STATUS       (&pin_P1_14)
 
 #if QSPI_FLASH_FILESYSTEM

ports/nrf/boards/circuitplayground_bluefruit/mpconfigboard.mk

@@ -10,6 +10,9 @@ MCU_CHIP = nrf52840
 SD ?= s140
 SOFTDEV_VERSION ?= 6.1.0
 
+# Unusually, board does not have a 32 kHz xtal.
+BOARD_HAS_32KHZ_XTAL = 0
+
 BOOT_SETTING_ADDR = 0xFF000
 
 ifeq ($(SD),)

ports/nrf/common-hal/bleio/Adapter.c

@@ -47,8 +47,17 @@ STATIC void softdevice_assert_handler(uint32_t id, uint32_t pc, uint32_t info) {
 
 STATIC uint32_t ble_stack_enable(void) {
     nrf_clock_lf_cfg_t clock_config = {
-        .source = NRF_CLOCK_LF_SRC_XTAL,
-        .accuracy = NRF_CLOCK_LF_ACCURACY_20_PPM
+#if BOARD_HAS_32KHZ_XTAL
+        .source       = NRF_CLOCK_LF_SRC_XTAL,
+        .rc_ctiv      = 0,
+        .rc_temp_ctiv = 0,
+        .accuracy     = NRF_CLOCK_LF_ACCURACY_20_PPM
+#else
+        .source       = NRF_CLOCK_LF_SRC_RC,
+        .rc_ctiv      = 16,
+        .rc_temp_ctiv = 2,
+        .accuracy     = NRF_CLOCK_LF_ACCURACY_250_PPM
+#endif
     };
 
     uint32_t err_code = sd_softdevice_enable(&clock_config, softdevice_assert_handler);

ports/nrf/common-hal/bleio/Characteristic.c

@@ -183,7 +183,7 @@ void common_hal_bleio_characteristic_set_value(bleio_characteristic_obj_t *self,
                                          (self->props & CHAR_PROP_WRITE_NO_RESPONSE));
         } else {
             if (self->fixed_length && bufinfo->len != self->max_length) {
-                mp_raise_ValueError(translate("Value length  required fixed length"));
+                mp_raise_ValueError(translate("Value length != required fixed length"));
             }
             if (bufinfo->len > self->max_length) {
                 mp_raise_ValueError(translate("Value length > max_length"));

ports/nrf/mpconfigport.mk

@@ -28,6 +28,11 @@ CIRCUITPY_RTC = 1
 # frequencyio not yet implemented
 CIRCUITPY_FREQUENCYIO = 0
 
+ifndef BOARD_HAS_32KHZ_XTAL
+# Assume crystal is present, which is the most common case.
+BOARD_HAS_32KHZ_XTAL = 1
+endif
+
 # CircuitPython doesn't yet support NFC so force the NFC antenna pins to be GPIO.
 # See https://github.com/adafruit/circuitpython/issues/1300
 # Defined here because system_nrf52840.c doesn't #include any of our own include files.

ports/nrf/peripherals/nrf/clocks.c

@@ -28,9 +28,12 @@
 #include "nrfx.h"
 
 void nrf_peripherals_clocks_init(void) {
-    // Set low-frequency clock source to be crystal. If there's a crystalless board, this will need to be
-    // generalized.
+
+#if BOARD_HAS_32KHZ_XTAL
     NRF_CLOCK->LFCLKSRC = (uint32_t)((CLOCK_LFCLKSRC_SRC_Xtal << CLOCK_LFCLKSRC_SRC_Pos) & CLOCK_LFCLKSRC_SRC_Msk);
+#else
+    NRF_CLOCK->LFCLKSRC = (uint32_t)((CLOCK_LFCLKSRC_SRC_RC << CLOCK_LFCLKSRC_SRC_Pos) & CLOCK_LFCLKSRC_SRC_Msk);
+#endif
     NRF_CLOCK->TASKS_LFCLKSTART = 1UL;
 
     // Wait for clocks to start.