From f2fb1b1b9bcb2ee8b2870a3ea481d9cf0f3ba844 Mon Sep 17 00:00:00 2001
From: baggio63446333 <55774994+baggio63446333@users.noreply.github.com>
Date: Wed, 29 Apr 2020 16:02:50 +0900
Subject: [PATCH] Porting for SPRESENSE board

Spresense's SPI has hardware automatic ss control that is not programmable by
software. So the transfer data must be buffered and transferred all at once.
---
 src/EthernetClient.cpp |  2 +-
 src/utility/w5100.cpp  | 61 ++++++++++++++++++++++++++++++++++++++++++
 src/utility/w5100.h    | 20 ++++++++++++++
 3 files changed, 82 insertions(+), 1 deletion(-)

diff --git a/src/EthernetClient.cpp b/src/EthernetClient.cpp
index e2406d7..5cbeaaf 100644
--- a/src/EthernetClient.cpp
+++ b/src/EthernetClient.cpp
@@ -47,7 +47,7 @@ int EthernetClient::connect(IPAddress ip, uint16_t port)
 		}
 		sockindex = MAX_SOCK_NUM;
 	}
-#if defined(ESP8266) || defined(ESP32)
+#if defined(ESP8266) || defined(ESP32) || defined(ARDUINO_ARCH_SPRESENSE)
 	if (ip == IPAddress((uint32_t)0) || ip == IPAddress(0xFFFFFFFFul)) return 0;
 #else
 	if (ip == IPAddress(0ul) || ip == IPAddress(0xFFFFFFFFul)) return 0;
diff --git a/src/utility/w5100.cpp b/src/utility/w5100.cpp
index 4ae4ee7..a40da8a 100644
--- a/src/utility/w5100.cpp
+++ b/src/utility/w5100.cpp
@@ -299,11 +299,20 @@ uint16_t W5100Class::write(uint16_t addr, const uint8_t *buf, uint16_t len)
 	if (chip == 51) {
 		for (uint16_t i=0; i<len; i++) {
 			setSS();
+#ifdef ARDUINO_ARCH_SPRESENSE
+			cmd[0] = 0xF0;
+			cmd[1] = addr >> 8;
+			cmd[2] = addr & 0xFF;
+			cmd[3] = buf[i];
+			SPI.transfer(cmd, 4);
+			addr++;
+#else /* !ARDUINO_ARCH_SPRESENSE */
 			SPI.transfer(0xF0);
 			SPI.transfer(addr >> 8);
 			SPI.transfer(addr & 0xFF);
 			addr++;
 			SPI.transfer(buf[i]);
+#endif /* ARDUINO_ARCH_SPRESENSE */
 			resetSS();
 		}
 	} else if (chip == 52) {
@@ -312,6 +321,15 @@ uint16_t W5100Class::write(uint16_t addr, const uint8_t *buf, uint16_t len)
 		cmd[1] = addr & 0xFF;
 		cmd[2] = ((len >> 8) & 0x7F) | 0x80;
 		cmd[3] = len & 0xFF;
+#ifdef ARDUINO_ARCH_SPRESENSE
+		uint8_t *txbuf = (uint8_t*)malloc(4 + len);
+		if (txbuf) {
+			memcpy(txbuf, cmd, 4);
+			memcpy(txbuf + 4, buf, len);
+			SPI.transfer(txbuf, 4 + len);
+			free(txbuf);
+		}
+#else /* !ARDUINO_ARCH_SPRESENSE */
 		SPI.transfer(cmd, 4);
 #ifdef SPI_HAS_TRANSFER_BUF
 		SPI.transfer(buf, NULL, len);
@@ -321,6 +339,7 @@ uint16_t W5100Class::write(uint16_t addr, const uint8_t *buf, uint16_t len)
 			SPI.transfer(buf[i]);
 		}
 #endif
+#endif /* ARDUINO_ARCH_SPRESENSE */
 		resetSS();
 	} else { // chip == 55
 		setSS();
@@ -368,6 +387,15 @@ uint16_t W5100Class::write(uint16_t addr, const uint8_t *buf, uint16_t len)
 			}
 			SPI.transfer(cmd, len + 3);
 		} else {
+#ifdef ARDUINO_ARCH_SPRESENSE
+			uint8_t *txbuf = (uint8_t*)malloc(3 + len);
+			if (txbuf) {
+				memcpy(txbuf, cmd, 3);
+				memcpy(txbuf + 3, buf, len);
+				SPI.transfer(txbuf, 3 + len);
+				free(txbuf);
+			}
+#else /* !ARDUINO_ARCH_SPRESENSE */
 			SPI.transfer(cmd, 3);
 #ifdef SPI_HAS_TRANSFER_BUF
 			SPI.transfer(buf, NULL, len);
@@ -377,6 +405,7 @@ uint16_t W5100Class::write(uint16_t addr, const uint8_t *buf, uint16_t len)
 				SPI.transfer(buf[i]);
 			}
 #endif
+#endif /* ARDUINO_ARCH_SPRESENSE */
 		}
 		resetSS();
 	}
@@ -390,6 +419,15 @@ uint16_t W5100Class::read(uint16_t addr, uint8_t *buf, uint16_t len)
 	if (chip == 51) {
 		for (uint16_t i=0; i < len; i++) {
 			setSS();
+#ifdef ARDUINO_ARCH_SPRESENSE
+			cmd[0] = 0x0F;
+			cmd[1] = addr >> 8;
+			cmd[2] = addr & 0xFF;
+			addr++;
+			cmd[3] = 0;
+			SPI.transfer(cmd, 4);
+			buf[i] = cmd[3];
+#else /* !ARDUINO_ARCH_SPRESENSE */
 			#if 1
 			SPI.transfer(0x0F);
 			SPI.transfer(addr >> 8);
@@ -405,6 +443,7 @@ uint16_t W5100Class::read(uint16_t addr, uint8_t *buf, uint16_t len)
 			buf[i] = cmd[3];
 			addr++;
 			#endif
+#endif /* ARDUINO_ARCH_SPRESENSE */
 			resetSS();
 		}
 	} else if (chip == 52) {
@@ -413,9 +452,20 @@ uint16_t W5100Class::read(uint16_t addr, uint8_t *buf, uint16_t len)
 		cmd[1] = addr & 0xFF;
 		cmd[2] = (len >> 8) & 0x7F;
 		cmd[3] = len & 0xFF;
+#ifdef ARDUINO_ARCH_SPRESENSE
+		uint8_t *rxbuf = (uint8_t*)malloc(4 + len);
+		if (rxbuf) {
+			memcpy(rxbuf, cmd, 4);
+			memset(rxbuf + 4, 0, len);
+			SPI.transfer(rxbuf, 4 + len);
+			memcpy(buf, rxbuf + 4, len);
+			free(rxbuf);
+		}
+#else /* !ARDUINO_ARCH_SPRESENSE */
 		SPI.transfer(cmd, 4);
 		memset(buf, 0, len);
 		SPI.transfer(buf, len);
+#endif /* ARDUINO_ARCH_SPRESENSE */
 		resetSS();
 	} else { // chip == 55
 		setSS();
@@ -457,9 +507,20 @@ uint16_t W5100Class::read(uint16_t addr, uint8_t *buf, uint16_t len)
 			cmd[2] = ((addr >> 6) & 0xE0) | 0x18; // 2K buffers
 			#endif
 		}
+#ifdef ARDUINO_ARCH_SPRESENSE
+		uint8_t *rxbuf = (uint8_t*)malloc(3 + len);
+		if (rxbuf) {
+			memcpy(rxbuf, cmd, 3);
+			memset(rxbuf + 3, 0, len);
+			SPI.transfer(rxbuf, 3 + len);
+			memcpy(buf, rxbuf + 3, len);
+			free(rxbuf);
+		}
+#else /* !ARDUINO_ARCH_SPRESENSE */
 		SPI.transfer(cmd, 3);
 		memset(buf, 0, len);
 		SPI.transfer(buf, len);
+#endif /* ARDUINO_ARCH_SPRESENSE */
 		resetSS();
 	}
 	return len;
diff --git a/src/utility/w5100.h b/src/utility/w5100.h
index 099556a..7d69c96 100644
--- a/src/utility/w5100.h
+++ b/src/utility/w5100.h
@@ -48,6 +48,11 @@
 #define SPI_ETHERNET_SETTINGS SPISettings(8000000, MSBFIRST, SPI_MODE0)
 #endif
 
+// Spresense's SPI can uses SPI_MODE3 with auto cs control by hardware.
+#if defined(ARDUINO_ARCH_SPRESENSE)
+#undef SPI_ETHERNET_SETTINGS
+#define SPI_ETHERNET_SETTINGS SPISettings(14000000, MSBFIRST, SPI_MODE3)
+#endif
 
 typedef uint8_t SOCKET;
 
@@ -432,6 +437,21 @@ class W5100Class {
 	inline static void resetSS() {
 		*(ss_pin_reg+6) = ss_pin_mask;
 	}
+
+#elif defined(ARDUINO_ARCH_SPRESENSE)
+	inline static void initSS() {
+		if (ss_pin != 10)
+			pinMode(ss_pin, OUTPUT);
+	}
+	inline static void setSS() {
+		if (ss_pin != 10)
+			digitalWrite(ss_pin, LOW);
+	}
+	inline static void resetSS() {
+		if (ss_pin != 10)
+			digitalWrite(ss_pin, HIGH);
+	}
+
 #else
 	inline static void initSS() {
 		pinMode(ss_pin, OUTPUT);