first commit

src/w5500.c

@@ -0,0 +1,46 @@
+#include "w5500.h"
+
+#include "ch32v003fun.h"
+
+static inline uint8_t SPI_is_RX_empty() { return SPI1->STATR & SPI_STATR_RXNE; }
+
+static inline void SPI_wait_not_busy() {
+  while ((SPI1->STATR & SPI_STATR_BSY) != 0);
+}
+
+static inline uint8_t SPI_transfer(uint8_t data) {
+  while (!(SPI1->STATR & SPI_STATR_TXE));
+  // SPI_wait_not_busy();
+  SPI1->DATAR = data;
+
+  while (!(SPI1->STATR & SPI_STATR_RXNE));
+  return SPI1->DATAR;
+}
+
+void W5500_Select(void) {
+  GPIOA->BCR = (1 << 4);  // Set PA4 (CS) low
+  // Delay_Ms(2);
+}
+
+void W5500_Unselect(void) {
+  GPIOA->BSHR = (1 << 4);  // Set PA4 (CS) high
+  // Delay_Ms(2);
+}
+
+uint8_t W5500_ReadByte() {
+  return SPI_transfer(0xFF);  // dummy byte to init read
+}
+
+void W5500_WriteByte(uint8_t byte) { SPI_transfer(byte); }
+
+void W5500_ReadBuff(uint8_t* buffer, uint16_t len) {
+  for (uint16_t i = 0; i < len; i++) {
+    buffer[i] = W5500_ReadByte();
+  }
+}
+
+void W5500_WriteBuff(uint8_t* buffer, uint16_t len) {
+  for (uint16_t i = 0; i < len; i++) {
+    W5500_WriteByte(buffer[i]);
+  }
+}