/* write up a 256 byte page or partial page */
static void w25q80bv_page_program(w25q80bv_driver_t* const drv, const uint32_t addr, const uint16_t len, uint8_t* data)
{
/* do nothing if asked to write beyond a page boundary */
if (((addr & 0xFF) + len) > drv->page_len)
return;
/* do nothing if we would overflow the flash */
if (addr > (drv->num_bytes - len))
return;
w25q80bv_write_enable(drv);
w25q80bv_wait_while_busy(drv);
uint8_t header[] = {
W25Q80BV_PAGE_PROGRAM,
(addr & 0xFF0000) >> 16,
(addr & 0xFF00) >> 8,
addr & 0xFF
};
const spi_transfer_t transfers[] = {
{ header, ARRAY_SIZE(header) },
{ data, len }
};
spi_bus_transfer_gather(drv->bus, transfers, ARRAY_SIZE(transfers));
}
/* write an arbitrary number of bytes */
void w25q80bv_read(w25q80bv_driver_t* const drv, uint32_t addr, uint32_t len, uint8_t* const data)
{
/* do nothing if we would overflow the flash */
if ((len > drv->num_bytes) || (addr > drv->num_bytes)
|| ((addr + len) > drv->num_bytes))
return;
w25q80bv_wait_while_busy(drv);
uint8_t header[] = {
W25Q80BV_FAST_READ,
(addr & 0xFF0000) >> 16,
(addr & 0xFF00) >> 8,
addr & 0xFF
};
const spi_transfer_t transfers[] = {
{ header, ARRAY_SIZE(header) },
{ data, len }
};
spi_bus_transfer_gather(drv->bus, transfers, ARRAY_SIZE(transfers));
}
/* write an arbitrary number of bytes */
void spiflash_read(spiflash_driver_t* const drv, uint32_t addr, uint32_t len, uint8_t* const data)
{
/* do nothing if we would overflow the flash */
if ((len > drv->num_bytes) || (addr > drv->num_bytes)
|| ((addr + len) > drv->num_bytes))
return;
spiflash_wait_while_busy(drv);
uint8_t header[] = {
SPIFLASH_FAST_READ,
(addr & 0xFF0000) >> 16,
(addr & 0xFF00) >> 8,
addr & 0xFF,
0x00
};
const spi_transfer_t transfers[] = {
{ header, ARRAY_SIZE(header) },
{ data, len }
};
spi_bus_transfer_gather(drv->target, transfers, ARRAY_SIZE(transfers));
}
