thebears
bbdcc1e623
- main.c: file-header comment describing the hardware and operation, logic split into named phases (sleep_until_interrupt, wake_peripheral_rails, take_counts_snapshot, send_wheel_counts_report, handle_minute_alarm, init_all_hardware); shared state renamed to say what it is and made static. - rfm69.c: reorganized into six labeled sections; cond_1/2/3 and hash scratch globals replaced by a reply_acknowledges() helper with clear locals; packet layout and every init register write documented. - LOG() macro (compiled out when DO_UART is off) replaces the #if DO_UART blocks that obscured the logic. - Drivers: file-header comments; named RTC_REG_*/RTC_ALM_MASK_BIT constants; EEPROM spool scheme documented; ADC_CHANNEL_BANDGAP named; repeated pin if/else helpers collapsed to SET_PIN_TO(). - Removed unused globals/buffers and commented-out code; ran clang-format with the project style. Register writes and radio protocol are byte-identical. Builds clean under -Wall -Wextra on gnu17 and c23; flash 13028 -> 12830 B, static RAM 1038 -> 999 B. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01YVJKatfeMJjAmuH9KYiLuv
51 lines
2.3 KiB
C
51 lines
2.3 KiB
C
#include "defines.h"
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#include "uart.h"
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#include <avr/io.h>
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#ifndef i2c_H
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#define i2c_H
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#define TWSR TWSR0
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#define TWDR TWDR0
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#define TWBR TWBR0
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#define TWCR TWCR0
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#define I2C_START_WRITE(device_addr) \
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{ \
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if (i2c_start((device_addr << 1) | 0x00)) { \
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return 1; \
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} \
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}
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#define I2C_START_READ(device_addr) \
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{ \
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if (i2c_start((device_addr << 1) | 0x01)) { \
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return 1; \
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} \
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}
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// A byte at F_SCL takes well under 100 us; anything past this means the bus is
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// stuck (peripheral unpowered, SDA held low) and we must not spin forever.
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#define I2C_TIMEOUT_LOOPS 20000U
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void i2c_init(void);
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uint8_t i2c_start(uint8_t address);
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uint8_t write_one_byte(uint8_t device_addr, uint8_t register_addr, uint8_t data);
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uint8_t write_n_bytes(uint8_t device_addr, uint8_t register_addr, uint8_t* data, uint8_t n_bytes);
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uint8_t read_one_byte_16bit_addr_no_err_register(uint8_t device_addr, uint16_t register_addr);
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uint8_t read_one_byte_16bit_addr(uint8_t device_addr, uint16_t register_addr, uint8_t* data);
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uint8_t read_n_bytes_16bit_addr(
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uint8_t device_addr, uint16_t register_addr, uint8_t* data, uint8_t n_bytes);
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uint8_t read_one_byte_no_err_register(uint8_t device_addr, uint8_t register_addr);
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uint8_t read_one_byte(uint8_t device_addr, uint8_t register_addr, uint8_t* data);
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uint8_t read_n_bytes(uint8_t device_addr, uint8_t register_addr, uint8_t* data, uint8_t n_bytes);
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void i2c_stop(void);
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uint8_t i2c_read_ack(void);
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uint8_t i2c_read_nack(void);
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uint8_t i2c_write(uint8_t data);
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#endif |