Import Mbed OS hard-float snapshot

connectivity/drivers/nfc/PN512/source/transceiver/pn512_cmd.c

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+/*
+ * Copyright (c) 2013-2018, ARM Limited, All Rights Reserved
+ * 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.
+ */
+/**
+ * \file pn512_cmd.c
+ * \copyright Copyright (c) ARM Ltd 2013
+ * \author Donatien Garnier
+ * \details Format and execute PN512 commands
+ * \internal
+ */
+
+#define __DEBUG__ 0
+#ifndef __MODULE__
+#define __MODULE__ "pn512_cmd.c"
+#endif
+#include "stack/nfc_errors.h"
+
+#include "pn512_cmd.h"
+
+#define PN512_FIFO_SIZE 64
+
+#include "pn512.h"
+#include "pn512_registers.h"
+#include "pn512_irq.h"
+#include "pn512_hw.h"
+
+/** \addtogroup PN512
+ *  \internal
+ *  @{
+ *  \name Commands
+ *  @{
+ */
+
+/** \internal Initialize underlying pn512_cmd_t structure
+ * \param pPN512 pointer to pn512_t structure
+ */
+void pn512_cmd_init(pn512_t *pPN512)
+{
+    (void) pPN512;
+}
+
+//Fifo read / write
+/** \internal Write bytes to FIFO
+ * \param pPN512 pointer to pn512_t structure
+ * \param pData buffer to write
+ */
+void pn512_fifo_write(pn512_t *pPN512, ac_buffer_t *pData)
+{
+    uint8_t fifo_space = pn512_fifo_space(pPN512); //Do not call this fn twice
+    size_t len = ac_buffer_reader_readable(pData);
+    len = MIN(fifo_space, len);
+
+    pn512_register_switch_page(pPN512, PN512_REG_FIFODATA);
+    pn512_hw_write_buffer(pPN512, PN512_REG_FIFODATA, pData, len);
+}
+
+/** \internal Read bytes from FIFO
+ * \param pPN512 pointer to pn512_t structure
+ * \param pData buffer in which to read
+ */
+void pn512_fifo_read(pn512_t *pPN512, ac_buffer_builder_t *pData)
+{
+    uint8_t fifo_len = pn512_fifo_length(pPN512); //Do not call this fn twice
+    size_t len = ac_buffer_builder_writable(pData);
+    len = MIN(fifo_len, len);
+
+    pn512_register_switch_page(pPN512, PN512_REG_FIFODATA);
+    pn512_hw_read_buffer(pPN512, PN512_REG_FIFODATA, pData, len);
+}
+
+/** \internal Clear FIFO
+ * Removes any bytes left in FIFO
+ * \param pPN512 pointer to pn512_t structure
+ */
+void pn512_fifo_clear(pn512_t *pPN512)
+{
+    pn512_register_write(pPN512, PN512_REG_FIFOLEVEL, 0x80); //Flush FIFO
+}
+
+/** \internal Get space in FIFO
+ * \param pPN512 pointer to pn512_t structure
+ * \return number of bytes that can be written to FIFO
+ */
+size_t pn512_fifo_space(pn512_t *pPN512)
+{
+    return PN512_FIFO_SIZE - pn512_register_read(pPN512, PN512_REG_FIFOLEVEL);
+}
+
+/** \internal Get FIFO length
+ * \param pPN512 pointer to pn512_t structure
+ * \return number of bytes that can be read from FIFO
+ */
+size_t pn512_fifo_length(pn512_t *pPN512)
+{
+    return pn512_register_read(pPN512, PN512_REG_FIFOLEVEL);
+}
+
+/** \internal Execute command
+ * \param pPN512 pointer to pn512_t structure
+ * \param cmd PN512 command to execute
+ */
+void pn512_cmd_exec(pn512_t *pPN512, uint8_t cmd)
+{
+    pn512_register_write(pPN512, PN512_REG_COMMAND, cmd);
+}
+
+/** \internal Wait for command completion
+ * \param pPN512 pointer to pn512_t structure
+ * \param timeout timeout in milliseconds or -1 for blocking mode
+ * \return NFC_OK on success or NFC_ERR_TIMEOUT on timeout
+ */
+nfc_err_t pn512_cmd_wait_idle(pn512_t *pPN512, int timeout)
+{
+    (void) timeout;
+    while (pn512_cmd_get(pPN512) != PN512_CMD_IDLE) {
+
+    }
+    return NFC_OK;
+}
+
+
+/** \internal Read executed command
+ * \param pPN512 pointer to pn512_t structure
+ * \return PN512 command being executed
+ */
+uint8_t pn512_cmd_get(pn512_t *pPN512)
+{
+    return pn512_register_read(pPN512, PN512_REG_COMMAND) & PN512_CMD_REG_MASK;
+}
+
+/**
+ * @}
+ * @}
+ * */
+