chore: onewire

lib/onewire/onewire.h

@@ -0,0 +1,98 @@
+#ifndef CH32V003_ONEWIRE_H
+#define CH32V003_ONEWIRE_H
+
+#include <stdbool.h>
+#include <stdint.h>
+
+#include "ch32v003fun.h"
+
+// GPIO Direct Access Definitions
+#ifndef OneWire_Direct_GPIO_h
+#define OneWire_Direct_GPIO_h
+
+static inline __attribute__((always_inline)) uint8_t directRead() {
+  return (GPIOB->INDR & (1 << 9)) ? 1 : 0;
+}
+
+static inline __attribute__((always_inline)) void directModeInput() {
+  GPIOB->CFGHR &= ~(0xF << (4 * (9 - 8)));
+  GPIOB->CFGHR |= (0x4 << (4 * (9 - 8)));
+}
+
+static inline __attribute__((always_inline)) void directModeOutput() {
+  GPIOB->CFGHR &= ~(0xF << (4 * (9 - 8)));
+  GPIOB->CFGHR |= (0x3 << (4 * (9 - 8)));
+}
+
+static inline __attribute__((always_inline)) void directWriteLow() {
+  GPIOB->BCR = (1 << 9);
+}
+
+static inline __attribute__((always_inline)) void directWriteHigh() {
+  GPIOB->BSHR = (1 << 9);
+}
+
+#define DIRECT_READ() directRead()
+#define DIRECT_WRITE_LOW() directWriteLow()
+#define DIRECT_WRITE_HIGH() directWriteHigh()
+#define DIRECT_MODE_INPUT() directModeInput()
+#define DIRECT_MODE_OUTPUT() directModeOutput()
+#endif
+
+// OneWire Function Declarations
+
+// Initialize the OneWire bus
+void OneWireBegin(void);
+
+// Perform a 1-Wire reset cycle. Returns 1 if a device responds with a presence
+// pulse
+uint8_t OneWireReset(void);
+
+// Select a device on the bus using its ROM code
+void OneWireSelect(const uint8_t rom[8]);
+
+// Skip ROM selection - addresses all devices on the bus
+void OneWireSkip(void);
+
+// Write a byte to the bus. If 'power' is true, maintain strong pullup after
+// write
+void OneWireWrite(uint8_t v, uint8_t power);
+
+// Write multiple bytes to the bus
+void OneWireWriteBytes(const uint8_t *buf, uint16_t count, bool power);
+
+// Read a byte from the bus
+uint8_t OneWireRead(void);
+
+// Read multiple bytes from the bus
+void OneWireReadBytes(uint8_t *buf, uint16_t count);
+
+// Write a single bit to the bus
+void OneWireWriteBit(uint8_t v);
+
+// Read a single bit from the bus
+uint8_t OneWireReadBit(void);
+
+// Stop forcing power onto the bus
+void OneWireDepower(void);
+
+// Reset the search state
+void OneWireResetSearch(void);
+
+// Setup search to find devices of a specific family code
+void OneWireTargetSearch(uint8_t family_code);
+
+// Search for the next device on the bus
+bool OneWireSearch(uint8_t *newAddr, bool search_mode);
+
+// Calculate 8-bit CRC
+uint8_t OneWireCrc8(const uint8_t *addr, uint8_t len);
+
+// Check if received CRC matches calculated CRC
+bool OneWireCheckCrc16(const uint8_t *input, uint16_t len,
+                       const uint8_t *inverted_crc, uint16_t crc);
+
+// Calculate 16-bit CRC
+uint16_t OneWireCrc16(const uint8_t *input, uint16_t len, uint16_t crc);
+
+#endif  // CH32V003_ONEWIRE_H