Add implementation for CRC API

Author: stevew817

targets/TARGET_Silicon_Labs/TARGET_EFM32/crc_api.c

@@ -0,0 +1,147 @@
+/***************************************************************************//**
+ * @file crc_api.c
+ *******************************************************************************
+ * @section License
+ * <b>(C) Copyright 2018 Silicon Labs, http://www.silabs.com</b>
+ *******************************************************************************
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may
+ * not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ ******************************************************************************/
+
+#include "device.h"
+#include "clocking.h"
+#include <stdio.h>
+
+#if DEVICE_CRC
+#include "mbed_assert.h"
+#include "crc_api.h"
+#include "em_cmu.h"
+
+#if defined(GPCRC_PRESENT) && (GPCRC_COUNT > 0)
+#include "em_gpcrc.h"
+
+static bool revOutput = false;
+static uint32_t final_xor;
+
+bool hal_crc_is_supported(const crc_mbed_config_t *config)
+{
+    //GPCRC supports any 16-bit poly, but only the CCITT 32-bit poly
+    if (config == NULL) {
+        return false;
+    }
+
+    if (config->width == 16) {
+        return true;
+    } else if (config->width == 32) {
+        if (config->polynomial == POLY_32BIT_ANSI) {
+            return true;
+        } else {
+            return false;
+        }
+    } else {
+        return false;
+    }
+}
+
+void hal_crc_compute_partial_start(const crc_mbed_config_t *config)
+{
+    if (!hal_crc_is_supported(config)) {
+        return;
+    }
+
+    CMU_ClockEnable(cmuClock_GPCRC, true);
+    GPCRC_Reset(GPCRC);
+
+    GPCRC_Init_TypeDef crc_init;
+
+    crc_init.autoInit = false;
+    crc_init.enable = true;
+    crc_init.crcPoly = config->polynomial;
+
+    // GPCRC operates on bit-reversed inputs and outputs vs the standard
+    // defined by the mbed API. Emlib does the reversal on the poly, but
+    // not on the initial value.
+    if (config->width == 16) {
+        crc_init.initValue = __RBIT(config->initial_xor) >> 16;
+    } else {
+        crc_init.initValue = __RBIT(config->initial_xor);
+    }
+
+    // GPCRC operates on bit-reversed inputs and outputs vs the standard
+    // defined by the mbed API, so reflect_in/out needs to be negated.
+    if (config->reflect_in) {
+        crc_init.reverseByteOrder = false;
+        crc_init.reverseBits = false;
+    } else {
+        crc_init.reverseByteOrder = true;
+        crc_init.reverseBits = true;
+    }
+
+    // Disable byte mode to be able to run a faster U32 input version
+    crc_init.enableByteMode = false;
+
+    // GPCRC does not support hardware output bit-reversal, nor finalisation.
+    // Since the mbed API does not pass the config struct when fetching the
+    // CRC calculation result, we need to keep track of these locally.
+    revOutput = config->reflect_out;
+    final_xor = config->final_xor;
+
+    GPCRC_Init(GPCRC, &crc_init);
+    GPCRC_Start(GPCRC);
+}
+
+void hal_crc_compute_partial(const uint8_t *data, const size_t size)
+{
+    if (data == NULL || size <= 0) {
+        return;
+    }
+
+    if (((uint32_t)data & 0x3) != 0 || size < 4) {
+        // Unaligned or very small input, run a bytewise CRC
+        for (size_t i = 0; i < size; i++) {
+            GPCRC_InputU8(GPCRC, data[i]);
+        }
+    } else {
+        // Aligned input, run 32-bit inputs as long as possible to make go faster.
+        size_t i = 0;
+        for (; i < (size & (~0x3)); i+=4) {
+            GPCRC_InputU32(GPCRC, *((uint32_t*)(&data[i])));
+        }
+        for (; i < size; i++) {
+            GPCRC_InputU8(GPCRC, data[i]);
+        }
+    }
+}
+
+uint32_t hal_crc_get_result(void)
+{
+    uint32_t result;
+
+    // GPCRC operates on bit-reversed inputs and outputs vs the standard
+    // defined by the mbed API.
+    if (!revOutput) {
+        result = GPCRC_DataReadBitReversed(GPCRC);
+    } else {
+        result = GPCRC_DataRead(GPCRC);
+    }
+
+    GPCRC_Enable(GPCRC, false);
+
+    return result ^ final_xor;
+}
+
+#endif //GPCRC_PRESENT
+#endif //DEVICE_CRC

targets/targets.json

@@ -3255,7 +3255,7 @@
     },
     "EFM32PG_STK3401": {
         "inherits": ["EFM32PG1B100F256GM32"],
-        "device_has": ["ANALOGIN", "I2C", "I2CSLAVE", "I2C_ASYNCH", "INTERRUPTIN", "LPTICKER", "PORTIN", "PORTINOUT", "PORTOUT", "PWMOUT", "RTC", "SERIAL", "SERIAL_ASYNCH", "SLEEP", "SPI", "SPISLAVE", "SPI_ASYNCH", "STDIO_MESSAGES", "USTICKER", "FLASH"],
+        "device_has": ["ANALOGIN", "CRC", "I2C", "I2CSLAVE", "I2C_ASYNCH", "INTERRUPTIN", "LPTICKER", "PORTIN", "PORTINOUT", "PORTOUT", "PWMOUT", "RTC", "SERIAL", "SERIAL_ASYNCH", "SLEEP", "SPI", "SPISLAVE", "SPI_ASYNCH", "STDIO_MESSAGES", "USTICKER", "FLASH"],
         "forced_reset_timeout": 2,
         "config": {
             "hf_clock_src": {
@@ -3318,7 +3318,7 @@
     },
     "EFR32MG1_BRD4150": {
         "inherits": ["EFR32MG1P132F256GM48"],
-        "device_has": ["ANALOGIN", "I2C", "I2CSLAVE", "I2C_ASYNCH", "INTERRUPTIN", "LPTICKER", "PORTIN", "PORTINOUT", "PORTOUT", "PWMOUT", "RTC", "SERIAL", "SERIAL_ASYNCH", "SLEEP", "SPI", "SPISLAVE", "SPI_ASYNCH", "STDIO_MESSAGES", "USTICKER", "FLASH"],
+        "device_has": ["ANALOGIN", "CRC", "I2C", "I2CSLAVE", "I2C_ASYNCH", "INTERRUPTIN", "LPTICKER", "PORTIN", "PORTINOUT", "PORTOUT", "PWMOUT", "RTC", "SERIAL", "SERIAL_ASYNCH", "SLEEP", "SPI", "SPISLAVE", "SPI_ASYNCH", "STDIO_MESSAGES", "USTICKER", "FLASH"],
         "forced_reset_timeout": 2,
         "config": {
             "hf_clock_src": {
@@ -3361,7 +3361,7 @@
     },
     "TB_SENSE_1": {
         "inherits": ["EFR32MG1P233F256GM48"],
-        "device_has": ["ANALOGIN", "I2C", "I2CSLAVE", "I2C_ASYNCH", "INTERRUPTIN", "LPTICKER", "PORTIN", "PORTINOUT", "PORTOUT", "PWMOUT", "RTC", "SERIAL", "SERIAL_ASYNCH", "SLEEP", "SPI", "SPISLAVE", "SPI_ASYNCH", "STDIO_MESSAGES", "USTICKER", "FLASH"],
+        "device_has": ["ANALOGIN", "CRC", "I2C", "I2CSLAVE", "I2C_ASYNCH", "INTERRUPTIN", "LPTICKER", "PORTIN", "PORTINOUT", "PORTOUT", "PWMOUT", "RTC", "SERIAL", "SERIAL_ASYNCH", "SLEEP", "SPI", "SPISLAVE", "SPI_ASYNCH", "STDIO_MESSAGES", "USTICKER", "FLASH"],
         "forced_reset_timeout": 5,
         "config": {
             "hf_clock_src": {
@@ -3409,7 +3409,7 @@
     },
     "EFM32PG12_STK3402": {
         "inherits": ["EFM32PG12B500F1024GL125"],
-        "device_has": ["ANALOGIN", "I2C", "I2CSLAVE", "I2C_ASYNCH", "INTERRUPTIN", "LPTICKER", "PORTIN", "PORTINOUT", "PORTOUT", "PWMOUT", "RTC", "SERIAL", "SERIAL_ASYNCH", "SLEEP", "SPI", "SPISLAVE", "SPI_ASYNCH", "STDIO_MESSAGES", "USTICKER", "TRNG", "FLASH"],
+        "device_has": ["ANALOGIN", "CRC", "I2C", "I2CSLAVE", "I2C_ASYNCH", "INTERRUPTIN", "LPTICKER", "PORTIN", "PORTINOUT", "PORTOUT", "PWMOUT", "RTC", "SERIAL", "SERIAL_ASYNCH", "SLEEP", "SPI", "SPISLAVE", "SPI_ASYNCH", "STDIO_MESSAGES", "USTICKER", "TRNG", "FLASH"],
         "forced_reset_timeout": 2,
         "config": {
             "hf_clock_src": {
@@ -3463,7 +3463,7 @@
     "TB_SENSE_12": {
         "inherits": ["EFR32MG12P332F1024GL125"],
         "device_name": "EFR32MG12P332F1024GL125",
-        "device_has": ["ANALOGIN", "I2C", "I2CSLAVE", "I2C_ASYNCH", "INTERRUPTIN", "LPTICKER", "PORTIN", "PORTINOUT", "PORTOUT", "PWMOUT", "RTC", "SERIAL", "SERIAL_ASYNCH", "SLEEP", "SPI", "SPISLAVE", "SPI_ASYNCH", "STDIO_MESSAGES", "USTICKER", "TRNG", "FLASH"],
+        "device_has": ["ANALOGIN", "CRC", "I2C", "I2CSLAVE", "I2C_ASYNCH", "INTERRUPTIN", "LPTICKER", "PORTIN", "PORTINOUT", "PORTOUT", "PWMOUT", "RTC", "SERIAL", "SERIAL_ASYNCH", "SLEEP", "SPI", "SPISLAVE", "SPI_ASYNCH", "STDIO_MESSAGES", "USTICKER", "TRNG", "FLASH"],
         "forced_reset_timeout": 5,
         "config": {
             "hf_clock_src": {
@@ -3512,7 +3512,7 @@
     "EFM32GG11_STK3701": {
         "inherits": ["EFM32GG11B820F2048GL192"],
         "device_name": "EFM32GG11B820F2048GL192",
-        "device_has": ["ANALOGIN", "EMAC", "I2C", "I2CSLAVE", "I2C_ASYNCH", "INTERRUPTIN", "LPTICKER", "PORTIN", "PORTINOUT", "PORTOUT", "PWMOUT", "RTC", "SERIAL", "SERIAL_ASYNCH", "SLEEP", "SPI", "SPISLAVE", "SPI_ASYNCH", "STDIO_MESSAGES", "USTICKER", "TRNG", "FLASH"],
+        "device_has": ["ANALOGIN", "CRC", "EMAC", "I2C", "I2CSLAVE", "I2C_ASYNCH", "INTERRUPTIN", "LPTICKER", "PORTIN", "PORTINOUT", "PORTOUT", "PWMOUT", "RTC", "SERIAL", "SERIAL_ASYNCH", "SLEEP", "SPI", "SPISLAVE", "SPI_ASYNCH", "STDIO_MESSAGES", "USTICKER", "TRNG", "FLASH"],
         "forced_reset_timeout": 5,
         "config": {
             "hf_clock_src": {