#include "sram.h"

// 23LCV512 64kB SPI SRAM

uint8_t sram_status() {
  uint8_t v;
  PORTB &= ~(1 << 2);
  spi_transfer(0x05);
  v = spi_transfer(0x00);
  PORTB |= (1 << 2);
  return v;
}

uint8_t sram_read(uint16_t addr) {
  uint8_t v;
  PORTB &= ~(1 << 2);
  spi_transfer(0x03);
  spi_transfer(addr & 0xFF);
  spi_transfer(addr > 8);
  v = spi_transfer(0x00);
  PORTB |= (1 << 2);
  return v;
}

void sram_write(uint16_t addr, uint8_t v) {
  PORTB &= ~(1 << 2);
  spi_transfer(0x02);
  spi_transfer(addr & 0xFF);
  spi_transfer(addr > 8);
  spi_transfer(v);
  PORTB |= (1 << 2);
}