void m25_write_status(u8 sr)
{
spi_slave_select(SPI_SLAVE_FLASH);
spi_xfer(SPI_BUS_FLASH, M25_WRSR);
spi_xfer(SPI_BUS_FLASH, sr);
spi_slave_deselect();
}
/* Returns the 32-bit value representing temperature data from the module. */
static uint32_t max31855_read(void)
{
uint32_t raw_reading;
spi_slave_select(SPI_SLAVE_MAX31855);
raw_reading = spi_read_dword();
spi_slave_deselect();
return raw_reading;
}
u8 m25_read_status(void)
{
u8 sr;
spi_slave_select(SPI_SLAVE_FLASH);
spi_xfer(SPI_BUS_FLASH, M25_RDSR);
sr = spi_xfer(SPI_BUS_FLASH, 0x00);
spi_slave_deselect();
return sr;
}
void m25_bulk_erase(void)
{
spi_slave_select(SPI_SLAVE_FLASH);
spi_xfer(SPI_BUS_FLASH, M25_BE);
spi_slave_deselect();
while(m25_read_status() & M25_SR_WIP);
}
/** Write to one of the MAX2769 registers.
*
* \param addr MAX2769 register to write to.
* \param data Data to write to register (28 bits).
*/
void max2769_write(u8 addr, u32 data)
{
u32 write_word = ((data << 4) & 0xFFFFFFF0) | (addr & 0x0F);
spi_slave_select(SPI_SLAVE_FRONTEND);
spi_xfer(SPI_BUS_FRONTEND, (write_word >> 24) & 0xFF);
spi_xfer(SPI_BUS_FRONTEND, (write_word >> 16) & 0xFF);
spi_xfer(SPI_BUS_FRONTEND, (write_word >> 8) & 0xFF);
spi_xfer(SPI_BUS_FRONTEND, (write_word >> 0) & 0xFF);
spi_slave_deselect();
}
u32 m25_read_id(void)
{
u8 manf_id, mem_type, mem_capacity;
spi_slave_select(SPI_SLAVE_FLASH);
spi_xfer(SPI_BUS_FLASH, M25_RDID);
manf_id = (u8)spi_xfer(SPI_BUS_FLASH, 0x00);
mem_type = (u8)spi_xfer(SPI_BUS_FLASH, 0x00);
mem_capacity = (u8)spi_xfer(SPI_BUS_FLASH, 0x00);
spi_slave_deselect();
return mem_capacity | mem_type << 8 | manf_id << 16;
}
void m25_sector_erase(u32 addr)
{
spi_slave_select(SPI_SLAVE_FLASH);
spi_xfer(SPI_BUS_FLASH, M25_SE);
spi_xfer(SPI_BUS_FLASH, (addr >> 16) & 0xFF);
spi_xfer(SPI_BUS_FLASH, (addr >> 8) & 0xFF);
spi_xfer(SPI_BUS_FLASH, addr & 0xFF);
spi_slave_deselect();
while(m25_read_status() & M25_SR_WIP);
}
void m25_page_program(u32 addr, u8 len, u8 buff[])
{
u32 i;
spi_slave_select(SPI_SLAVE_FLASH);
spi_xfer(SPI_BUS_FLASH, M25_PP);
spi_xfer(SPI_BUS_FLASH, (addr >> 16) & 0xFF);
spi_xfer(SPI_BUS_FLASH, (addr >> 8) & 0xFF);
spi_xfer(SPI_BUS_FLASH, addr & 0xFF);
for(i = 0; i < len; i++)
spi_xfer(SPI_BUS_FLASH, buff[i]);
spi_slave_deselect();
while(m25_read_status() & M25_SR_WIP);
}
void m25_read(u32 addr, u32 len, u8 *buff)
{
spi_slave_select(SPI_SLAVE_FLASH);
// spi_xfer(SPI_BUS_FLASH, M25_FAST_READ);
spi_xfer(SPI_BUS_FLASH, M25_READ);
spi_xfer(SPI_BUS_FLASH, (addr >> 16) & 0xFF);
spi_xfer(SPI_BUS_FLASH, (addr >> 8) & 0xFF);
spi_xfer(SPI_BUS_FLASH, addr & 0xFF);
// spi_xfer(SPI_BUS_FLASH, 0x00); // Dummy byte
for(u32 i=0; i < len; i++)
buff[i] = spi_xfer(SPI_BUS_FLASH, 0x00);
spi_slave_deselect();
}
void m25_write_disable(void)
{
spi_slave_select(SPI_SLAVE_FLASH);
spi_xfer(SPI_BUS_FLASH, M25_WRDI);
spi_slave_deselect();
}