Add K64F Hardware CRC reference implementation

- Add support for all currently defined polynomials
- Add 'CRC' flag to targets.json for K64F profile

Author: Steven Cartmell

targets/TARGET_Freescale/TARGET_MCUXpresso_MCUS/TARGET_MCU_K64F/mbed_crc_api.c

@@ -0,0 +1,125 @@
+#include "crc_api.h"
+
+#include "drivers/fsl_crc.h"
+#include "platform/mbed_assert.h"
+
+#ifdef DEVICE_CRC
+
+static crc_bits_t width;
+
+bool hal_crc_is_supported(const uint32_t polynomial)
+{
+  switch (polynomial)
+  {
+    case POLY_8BIT_CCITT:
+    case POLY_7BIT_SD:
+    case POLY_16BIT_CCITT:
+    case POLY_16BIT_IBM:
+    case POLY_32BIT_ANSI:
+      return true;
+    default:
+      return false;
+  }
+}
+
+void hal_crc_compute_partial_start(const uint32_t polynomial)
+{
+  crc_config_t config;
+
+  switch (polynomial)
+  {
+    case POLY_32BIT_ANSI:
+    {
+      width = kCrcBits32;
+
+      config.polynomial         = polynomial;
+      config.seed               = 0xFFFFFFFFU;
+      config.reflectIn          = true;
+      config.reflectOut         = true;
+      config.complementChecksum = true;
+      config.crcBits            = width;
+      config.crcResult          = kCrcFinalChecksum;
+
+      break;
+    }
+    case POLY_16BIT_IBM:
+    {
+      width = kCrcBits16;
+
+      config.polynomial         = polynomial;
+      config.seed               = 0;
+      config.reflectIn          = true;
+      config.reflectOut         = true;
+      config.complementChecksum = false;
+      config.crcBits            = width;
+      config.crcResult          = kCrcFinalChecksum;
+
+      break;
+    }
+    case POLY_16BIT_CCITT:
+    {
+      width = kCrcBits16;
+
+      config.polynomial         = polynomial;
+      config.seed               = 0xFFFFFFFFU;
+      config.reflectIn          = false;
+      config.reflectOut         = false;
+      config.complementChecksum = false;
+      config.crcBits            = width;
+      config.crcResult          = kCrcFinalChecksum;
+
+      break;
+    }
+    case POLY_8BIT_CCITT:
+    {
+      width = kCrcBits16;
+
+      config.polynomial         = polynomial;
+      config.seed               = 0U;
+      config.reflectIn          = false;
+      config.reflectOut         = false;
+      config.complementChecksum = false;
+      config.crcBits            = width;
+      config.crcResult          = kCrcFinalChecksum;
+
+      break;
+    }
+    case POLY_7BIT_SD:
+    {
+      width = kCrcBits16;
+
+      config.polynomial         = polynomial;
+      config.seed               = 0U;
+      config.reflectIn          = false;
+      config.reflectOut         = false;
+      config.complementChecksum = false;
+      config.crcBits            = width;
+      config.crcResult          = kCrcFinalChecksum;
+
+      break;
+    }
+  }
+
+  CRC_Init(CRC0, &config);
+}
+
+void hal_crc_compute_partial(const uint8_t *data, const size_t size)
+{
+  CRC_WriteData(CRC0, data, size);
+}
+
+uint32_t hal_crc_get_result(void)
+{
+  switch (width)
+  {
+    case kCrcBits16:
+      return CRC_Get16bitResult(CRC0);
+    case kCrcBits32:
+      return CRC_Get32bitResult(CRC0);
+    default:
+      MBED_ASSERT("Unhandled switch case");
+      return 0;
+  }
+}
+
+#endif // DEVICE_CRC

targets/targets.json

@@ -631,7 +631,7 @@
         "macros": ["CPU_MK64FN1M0VMD12", "FSL_RTOS_MBED"],
         "inherits": ["Target"],
         "detect_code": ["0240"],
-        "device_has": ["ANALOGIN", "ANALOGOUT", "EMAC", "I2C", "I2CSLAVE", "INTERRUPTIN", "LOWPOWERTIMER", "PORTIN", "PORTINOUT", "PORTOUT", "PWMOUT", "RTC", "SERIAL", "SERIAL_FC", "SERIAL_ASYNCH", "SLEEP", "SPI", "SPI_ASYNCH", "SPISLAVE", "STDIO_MESSAGES", "STORAGE", "TRNG", "FLASH"],
+        "device_has": ["ANALOGIN", "ANALOGOUT", "CRC", "EMAC", "I2C", "I2CSLAVE", "INTERRUPTIN", "LOWPOWERTIMER", "PORTIN", "PORTINOUT", "PORTOUT", "PWMOUT", "RTC", "SERIAL", "SERIAL_FC", "SERIAL_ASYNCH", "SLEEP", "SPI", "SPI_ASYNCH", "SPISLAVE", "STDIO_MESSAGES", "STORAGE", "TRNG", "FLASH"],
         "features": ["LWIP", "STORAGE"],
         "release_versions": ["2", "5"],
         "device_name": "MK64FN1M0xxx12",