[demo] Have ST send ACC data every 100 MS over SPI5

- Revert to HAL spi since there's still a timing bug in the new WIP driver
- Add nrf_sensors app to poll the ACC and send data every 100 ms

app/nrf_sensors/nrf_sensors.c

@@ -0,0 +1,58 @@
+#include <app.h>
+#include <arch.h>
+#include <assert.h>
+#include <debug.h>
+#include <err.h>
+#include <kernel/event.h>
+#include <lk/init.h>
+#include <stdlib.h>
+#include <trace.h>
+#include <target/gpioconfig.h>
+#include <stm32f7xx.h>
+#include <stm32f7xx_hal_spi.h>
+#include <dev/accelerometer.h>
+
+
+/* This code reads from the accelerometer then sends the data over to the nRF chip
+ * every 100 milliseconds. */
+static void nrf_sensors_init(const struct app_descriptor *app)
+{
+}
+
+static void nrf_sensors_entry(const struct app_descriptor *app, void *args)
+{
+    position_vector_t pos_vector;
+
+    SPI_HandleTypeDef spi_handle;
+    spi_handle.Instance               = SPI5;
+    spi_handle.Init.BaudRatePrescaler = SPI_BAUDRATEPRESCALER_128;
+    spi_handle.Init.Direction         = SPI_DIRECTION_2LINES;
+    spi_handle.Init.CLKPhase          = SPI_PHASE_1EDGE;
+    spi_handle.Init.CLKPolarity       = SPI_POLARITY_LOW;
+    spi_handle.Init.DataSize          = SPI_DATASIZE_8BIT;
+    spi_handle.Init.FirstBit          = SPI_FIRSTBIT_MSB;
+    spi_handle.Init.TIMode            = SPI_TIMODE_DISABLE;
+    spi_handle.Init.CRCCalculation    = SPI_CRCCALCULATION_DISABLE;
+    spi_handle.Init.CRCPolynomial     = 7;
+    spi_handle.Init.NSS               = SPI_NSS_SOFT;
+    spi_handle.Init.Mode              = SPI_MODE_MASTER;
+
+    gpio_config(GPIO_NRF_CS, GPIO_OUTPUT);
+    gpio_set(GPIO_NRF_CS, 1);
+
+    for (;;) {
+        acc_read_xyz(&pos_vector);
+        gpio_set(GPIO_NRF_CS, 0);
+        status_t ret = HAL_SPI_Transmit(&spi_handle, (uint8_t *)&pos_vector, sizeof(pos_vector), 5000);
+        if (ret != NO_ERROR) {
+            printf("error on spi_write for sensors: %d\n", ret);
+        }
+        gpio_set(GPIO_NRF_CS, 1);
+        thread_sleep(100);
+    }
+}
+
+APP_START(sbb)
+    .init  = nrf_sensors_init,
+    .entry = nrf_sensors_entry,
+APP_END

app/nrf_sensors/rules.mk

@@ -0,0 +1,9 @@
+LOCAL_DIR := $(GET_LOCAL_DIR)
+
+MODULE := $(LOCAL_DIR)
+
+MODULE_SRCS += \
+	$(LOCAL_DIR)/nrf_sensors.c \
+
+
+include make/module.mk

project/dartuinoP0-test.mk

@@ -13,6 +13,7 @@ MODULES += \
 
 MODULE_DEPS += \
     app/accelerometer \
+	app/nrf_sensors \
 
 MODULE_SRCS += \
     $(LOCAL_DIR)/sensor_bus.c \

target/dartuinoP0/sensor_bus.c

@@ -86,7 +86,7 @@ status_t sensor_bus_init_early(void)
     spi_handle.Init.NSS               = SPI_NSS_SOFT;
     spi_handle.Init.Mode              = SPI_MODE_MASTER;
 
-    if (HAL_SPI_Init(&spi_handle) != HAL_OK) {
+    if (spi_init(&spi_handle) != HAL_OK) {
         return ERR_GENERIC;
     }
     return NO_ERROR;