Diff: targets/TARGET_Realtek/TARGET_AMEBA/TARGET_MCU_RTL8195A/trng_api.c

Revision:

189:f392fc9709a3

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/targets/TARGET_Realtek/TARGET_AMEBA/TARGET_MCU_RTL8195A/trng_api.c	Wed Feb 20 22:31:08 2019 +0000
@@ -0,0 +1,77 @@
+/* mbed Microcontroller Library
+ * Copyright (c) 2013-2016 Realtek Semiconductor Corp.
+ *
+ * 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 "trng_api.h"
+#include "analogin_api.h"
+#include "analogin_ext.h"
+
+#ifdef CONFIG_MBED_ENABLED
+#include "platform_stdlib.h"
+#endif
+
+#if DEVICE_TRNG
+
+
+void trng_init(trng_t *obj)
+{
+    _memset((void *)obj, 0, sizeof(trng_t));
+    analogin_init(&obj->tradcng, (PinName)ADC0);
+    obj->inited = 1;
+}
+
+void trng_free(trng_t *obj)
+{
+    if (!obj->inited) {
+        return;
+    }
+    
+    obj->inited = 0;
+    analogin_deinit(&obj->tradcng);
+}
+
+static void trng_get_byte(trng_t *obj, unsigned char *byte)
+{
+    size_t bit;
+    uint32_t adc[2];
+    
+    PSAL_ADC_MNGT_ADPT      pSalADCMngtAdpt     = NULL;
+    PSAL_ADC_HND            pSalADCHND          = NULL;
+
+    pSalADCMngtAdpt         = &(obj->tradcng.SalADCMngtAdpt);
+    pSalADCHND              = &(pSalADCMngtAdpt->pSalHndPriv->SalADCHndPriv);
+
+    *byte = 0;
+    for (bit = 0; bit < 8; bit++) {
+        RtkADCRxManualRotate(pSalADCHND, adc);
+        *byte |= (adc[0] & 0x01) << bit;
+    }
+}
+
+int trng_get_bytes(trng_t *obj, uint8_t *buf, size_t len, size_t *output_len)
+{
+    size_t i;
+    
+    if (!obj->inited) {
+        return -1;
+    }
+
+    for (i = 0; i < len; i++) {
+        trng_get_byte(obj, buf + i);
+    }
+
+    *output_len = len;
+    return 0;
+}
+#endif