Import Mbed OS hard-float snapshot

connectivity/drivers/nfc/PN512/source/transceiver/pn512_registers.c

@@ -0,0 +1,153 @@
+
+/*
+ * 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_registers.c
+ * \copyright Copyright (c) ARM Ltd 2013
+ * \author Donatien Garnier
+ * \details Access to PN512 registers
+ */
+
+
+#define __DEBUG__ 0
+#ifndef __MODULE__
+#define __MODULE__ "pn512_registers.c"
+#endif
+#include "stack/nfc_errors.h"
+
+#include "pn512_registers.h"
+#include "pn512_hw.h"
+#include "pn512.h"
+
+#define REGISTER_PAGE(x) ((x)>>4)
+#define REGISTER_ADDR(x) ((x)&0xF)
+
+/** \addtogroup PN512
+ *  \internal
+ *  @{
+ *  \name Registers
+ *  @{
+ */
+
+static void pn512_register_switch_page_intl(pn512_t *pPN512, uint8_t page);
+
+/** \internal Initialize underlying pn512_registers_t structure
+ * \param pPN512 pointer to pn512_t structure
+ */
+void pn512_registers_init(pn512_t *pPN512)
+{
+    pPN512->registers.registers_page = 0;
+}
+
+#define PN512_CFG_INIT_LEN 9
+static const uint8_t PN512_CFG_INIT_REGS[] = {
+    PN512_REG_DIVIEN,
+    PN512_REG_MODE,
+    PN512_REG_GSNOFF,
+    PN512_REG_RFCFG,
+    PN512_REG_CWGSP,
+    PN512_REG_MIFNFC,
+    PN512_REG_FELNFC2,
+    PN512_REG_RXSEL,
+    PN512_REG_TYPEB
+};
+static const uint8_t PN512_CFG_INIT_VALS[] = {
+    0x80,
+    0x3F,
+    0xF2,
+    0x68,
+    0x3F,
+    0x62,
+    0x80,
+    0x84,
+    0x00
+}; //Timer: For now max prescaler, max reload value
+
+/** \internal Switch to known (0) registers page, reset registers state
+ * \param pPN512 pointer to pn512_t structure
+ */
+void pn512_registers_reset(pn512_t *pPN512)
+{
+    pn512_register_switch_page_intl(pPN512, 0);
+    for (int i = 0; i < PN512_CFG_INIT_LEN; i++) {
+        pn512_register_write(pPN512, PN512_CFG_INIT_REGS[i], PN512_CFG_INIT_VALS[i]);
+    }
+}
+
+/** \internal Write register
+ * \param pPN512 pointer to pn512_t structure
+ * \param address register address
+ * \param data value to write in register
+ */
+void pn512_register_write(pn512_t *pPN512, uint8_t address, uint8_t data)
+{
+    NFC_DBG("Write [%02x] << %02x", address, data);
+    if (REGISTER_PAGE(address) != pPN512->registers.registers_page) {
+        pn512_register_switch_page_intl(pPN512, REGISTER_PAGE(address));
+    }
+    address = REGISTER_ADDR(address);
+    pn512_hw_write(pPN512, address, &data, 1);
+}
+
+/** \internal Read register
+ * \param pPN512 pointer to pn512_t structure
+ * \param address register address
+ * \return data value read from register
+ */
+uint8_t pn512_register_read(pn512_t *pPN512, uint8_t address)
+{
+    uint8_t data;
+    NFC_DBG_BLOCK(
+        uint8_t __dbg_addr;
+        __dbg_addr = address; //FIXME
+    )
+    if (REGISTER_PAGE(address) != pPN512->registers.registers_page) {
+        pn512_register_switch_page_intl(pPN512, REGISTER_PAGE(address));
+    }
+    address = REGISTER_ADDR(address);
+    pn512_hw_read(pPN512, address, &data, 1);
+    NFC_DBG("Read  [%02x] >> %02x", __dbg_addr, data);
+    return data;
+}
+
+void pn512_register_switch_page(pn512_t *pPN512, uint8_t address)
+{
+    if (REGISTER_PAGE(address) != pPN512->registers.registers_page) {
+        pn512_register_switch_page_intl(pPN512, REGISTER_PAGE(address));
+    }
+}
+
+/** \internal Switch registers page
+ * \param pPN512 pointer to pn512_t structure
+ * \param page registers page
+ */
+void pn512_register_switch_page_intl(pn512_t *pPN512, uint8_t page)
+{
+    uint8_t pageRegValue;
+    pageRegValue = (1 << 7) | page;
+
+    pn512_hw_write(pPN512, PN512_REG_PAGE, &pageRegValue, 1);
+
+    pPN512->registers.registers_page = page;
+}
+
+
+
+/**
+ * @}
+ * @}
+ * */