HAL for Re:ARM (LPC1768) architecture

Marlin/src/HAL/HAL_LPC1768/HAL_spi.cpp

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+/**
+ * Marlin 3D Printer Firmware
+ * Copyright (C) 2016 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
+ *
+ * Based on Sprinter and grbl.
+ * Copyright (C) 2011 Camiel Gubbels / Erik van der Zalm
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+/**
+ * Software SPI functions originally from Arduino Sd2Card Library
+ * Copyright (C) 2009 by William Greiman
+ */
+
+/**
+ *
+ * For TARGET_LPC1768
+ */
+
+#ifdef TARGET_LPC1768
+
+// --------------------------------------------------------------------------
+// Includes
+// --------------------------------------------------------------------------
+
+#include "../../../MarlinConfig.h"
+
+// --------------------------------------------------------------------------
+// Public Variables
+// --------------------------------------------------------------------------
+
+
+// --------------------------------------------------------------------------
+// Public functions
+// --------------------------------------------------------------------------
+
+#if ENABLED(SOFTWARE_SPI)
+  // --------------------------------------------------------------------------
+  // software SPI
+  // --------------------------------------------------------------------------
+  // bitbanging transfer
+  // run at ~100KHz (necessary for init)
+  static uint8_t spiTransfer(uint8_t b) { // using Mode 0
+    for (int bits = 0; bits < 8; bits++) {
+      if (b & 0x80) {
+        WRITE(MOSI_PIN, HIGH);
+      }
+      else {
+        WRITE(MOSI_PIN, LOW);
+      }
+      b <<= 1;
+
+      WRITE(SCK_PIN, HIGH);
+      delayMicroseconds(3U);
+
+      if (READ(MISO_PIN)) {
+        b |= 1;
+      }
+      WRITE(SCK_PIN, LOW);
+      delayMicroseconds(3U);
+    }
+    return b;
+  }
+
+  void spiBegin() {
+    SET_OUTPUT(SS_PIN);
+    WRITE(SS_PIN, HIGH);
+    SET_OUTPUT(SCK_PIN);
+    SET_INPUT(MISO_PIN);
+    SET_OUTPUT(MOSI_PIN);
+  }
+
+  void spiInit(uint8_t spiRate) {
+    UNUSED(spiRate);
+    WRITE(SS_PIN, HIGH);
+    WRITE(MOSI_PIN, HIGH);
+    WRITE(SCK_PIN, LOW);
+  }
+
+  uint8_t spiRec() {
+    WRITE(SS_PIN, LOW);
+    uint8_t b = spiTransfer(0xff);
+    WRITE(SS_PIN, HIGH);
+    return b;
+  }
+
+  void spiRead(uint8_t*buf, uint16_t nbyte) {
+    if (nbyte == 0) return;
+    WRITE(SS_PIN, LOW);
+    for (int i = 0; i < nbyte; i++) {
+      buf[i] = spiTransfer(0xff);
+    }
+    WRITE(SS_PIN, HIGH);
+  }
+
+  void spiSend(uint8_t b) {
+    WRITE(SS_PIN, LOW);
+    uint8_t response = spiTransfer(b);
+    UNUSED(response);
+    WRITE(SS_PIN, HIGH);
+  }
+
+  static void spiSend(const uint8_t* buf, size_t n) {
+    uint8_t response;
+    if (n == 0) return;
+    WRITE(SS_PIN, LOW);
+    for (uint16_t i = 0; i < n; i++) {
+      response = spiTransfer(buf[i]);
+    }
+    UNUSED(response);
+    WRITE(SS_PIN, HIGH);
+  }
+
+  void spiSendBlock(uint8_t token, const uint8_t* buf) {
+    uint8_t response;
+
+    WRITE(SS_PIN, LOW);
+    response = spiTransfer(token);
+
+    for (uint16_t i = 0; i < 512; i++) {
+      response = spiTransfer(buf[i]);
+    }
+    UNUSED(response);
+    WRITE(SS_PIN, HIGH);
+  }
+#else
+  void spiBegin() {
+  }
+
+  void spiInit(uint8_t spiRate) {
+  }
+
+  void spiSend(byte b) {
+  }
+
+  void spiSend(const uint8_t* buf, size_t n) {
+  }
+
+  void spiSend(uint32_t chan, byte b) {
+  }
+
+  void spiSend(uint32_t chan, const uint8_t* buf, size_t n) {
+
+  }
+
+  // Read single byte from SPI
+  uint8_t spiRec() {
+    return 0;
+  }
+
+  uint8_t spiRec(uint32_t chan) {
+    return 0;
+  }
+
+  // Read from SPI into buffer
+  void spiRead(uint8_t*buf, uint16_t nbyte) {
+  }
+
+  // Write from buffer to SPI
+  void spiSendBlock(uint8_t token, const uint8_t* buf) {
+  }
+#endif // ENABLED(SOFTWARE_SPI)
+
+#endif // TARGET_LPC1768