Implement SPI API for NRF52x

Implement spi_api.c for NRF52X boards using SDK14.

This driver does not implement SPI slave functions and does not use SPIM.

Author: sarahmarshy

targets/TARGET_NORDIC/TARGET_NRF5x/TARGET_NRF52/TARGET_MCU_NRF52832/config/sdk_config.h

@@ -2666,7 +2666,7 @@
 
 
 #ifndef SPI0_USE_EASY_DMA
-#define SPI0_USE_EASY_DMA 1
+#define SPI0_USE_EASY_DMA 0
 #endif
 
 // <o> SPI0_DEFAULT_FREQUENCY  - SPI frequency
@@ -2688,13 +2688,13 @@
 // <e> SPI1_ENABLED - Enable SPI1 instance
 //==========================================================
 #ifndef SPI1_ENABLED
-#define SPI1_ENABLED 0
+#define SPI1_ENABLED 1
 #endif
 // <q> SPI1_USE_EASY_DMA  - Use EasyDMA
 
 
 #ifndef SPI1_USE_EASY_DMA
-#define SPI1_USE_EASY_DMA 1
+#define SPI1_USE_EASY_DMA 0
 #endif
 
 // <o> SPI1_DEFAULT_FREQUENCY  - SPI frequency
@@ -2716,13 +2716,13 @@
 // <e> SPI2_ENABLED - Enable SPI2 instance
 //==========================================================
 #ifndef SPI2_ENABLED
-#define SPI2_ENABLED 0
+#define SPI2_ENABLED 1
 #endif
 // <q> SPI2_USE_EASY_DMA  - Use EasyDMA
 
 
 #ifndef SPI2_USE_EASY_DMA
-#define SPI2_USE_EASY_DMA 1
+#define SPI2_USE_EASY_DMA 0
 #endif
 
 // <o> SPI2_DEFAULT_FREQUENCY  - SPI frequency
@@ -2928,7 +2928,7 @@
 // <e> TWI_ENABLED - nrf_drv_twi - TWI/TWIM peripheral driver
 //==========================================================
 #ifndef TWI_ENABLED
-#define TWI_ENABLED 0
+#define TWI_ENABLED 1
 #endif
 // <o> TWI_DEFAULT_CONFIG_FREQUENCY  - Frequency
 
@@ -2988,7 +2988,7 @@
 // <e> TWI1_ENABLED - Enable TWI1 instance
 //==========================================================
 #ifndef TWI1_ENABLED
-#define TWI1_ENABLED 0
+#define TWI1_ENABLED 1
 #endif
 // <q> TWI1_USE_EASY_DMA  - Use EasyDMA (if present)
 

targets/TARGET_NORDIC/TARGET_NRF5x/TARGET_NRF52/TARGET_MCU_NRF52840/config/sdk_config.h

@@ -2666,7 +2666,7 @@
 
 
 #ifndef SPI0_USE_EASY_DMA
-#define SPI0_USE_EASY_DMA 1
+#define SPI0_USE_EASY_DMA 0
 #endif
 
 // <o> SPI0_DEFAULT_FREQUENCY  - SPI frequency
@@ -2688,13 +2688,13 @@
 // <e> SPI1_ENABLED - Enable SPI1 instance
 //==========================================================
 #ifndef SPI1_ENABLED
-#define SPI1_ENABLED 0
+#define SPI1_ENABLED 1
 #endif
 // <q> SPI1_USE_EASY_DMA  - Use EasyDMA
 
 
 #ifndef SPI1_USE_EASY_DMA
-#define SPI1_USE_EASY_DMA 1
+#define SPI1_USE_EASY_DMA 0
 #endif
 
 // <o> SPI1_DEFAULT_FREQUENCY  - SPI frequency
@@ -2716,13 +2716,13 @@
 // <e> SPI2_ENABLED - Enable SPI2 instance
 //==========================================================
 #ifndef SPI2_ENABLED
-#define SPI2_ENABLED 0
+#define SPI2_ENABLED 1
 #endif
 // <q> SPI2_USE_EASY_DMA  - Use EasyDMA
 
 
 #ifndef SPI2_USE_EASY_DMA
-#define SPI2_USE_EASY_DMA 1
+#define SPI2_USE_EASY_DMA 0
 #endif
 
 // <o> SPI2_DEFAULT_FREQUENCY  - SPI frequency
@@ -2928,7 +2928,7 @@
 // <e> TWI_ENABLED - nrf_drv_twi - TWI/TWIM peripheral driver
 //==========================================================
 #ifndef TWI_ENABLED
-#define TWI_ENABLED 0
+#define TWI_ENABLED 1
 #endif
 // <o> TWI_DEFAULT_CONFIG_FREQUENCY  - Frequency
 
@@ -2988,7 +2988,7 @@
 // <e> TWI1_ENABLED - Enable TWI1 instance
 //==========================================================
 #ifndef TWI1_ENABLED
-#define TWI1_ENABLED 0
+#define TWI1_ENABLED 1
 #endif
 // <q> TWI1_USE_EASY_DMA  - Use EasyDMA (if present)
 

targets/TARGET_NORDIC/TARGET_NRF5x/objects.h

@@ -43,6 +43,8 @@
 #include "PortNames.h"
 #include "PeripheralNames.h"
 #include "PinNames.h"
+#include "nrf_drv_spi.h"
+#include "nrf_twi.h"
 
 #include "nrf_pwm.h"
 
@@ -55,7 +57,16 @@ struct serial_s {
 };                        // but it must be not empty (required by strict compiler - IAR)
 
 struct spi_s {
-    uint8_t spi_idx;
+    int instance;
+    PinName cs;
+    nrf_drv_spi_config_t config;
+    bool update;
+
+#if DEVICE_SPI_ASYNCH
+    uint32_t handler;
+    uint32_t mask;
+    uint32_t event;
+#endif
 };
 
 struct port_s {
@@ -73,7 +84,19 @@ struct pwmout_s {
 };
 
 struct i2c_s {
-    uint8_t twi_idx;
+    int instance;
+    PinName sda;
+    PinName scl;
+    nrf_twi_frequency_t frequency;
+    int state;
+    int mode;
+    bool update;
+
+#if DEVICE_I2C_ASYNCH
+    uint32_t handler;
+    uint32_t mask;
+    uint32_t event;
+#endif
 };
 
 struct analogin_s {