I figured as much when I couldn't find one. For the benefit of others trying to do the same thing I found that this one works
https://github.com/pellepl/spiflash_driver
You'll need to control the CS pin as GPIO not through the SDK SPI code as it does not seem to toggle it so the flash chip doesn't behave. My HAL code is as follows
int lpc_spiflash_spi_txrx(spiflash_t *spi, const uint8_t *tx_data,
uint32_t tx_len, uint8_t *rx_data, uint32_t rx_len)
{
spi_transfer_t xfer;
if(tx_len > 0)
{
xfer.txData = (uint8_t *)tx_data;
xfer.rxData = NULL;
xfer.dataSize = tx_len;
SPI_MasterTransferBlocking(SPI3, &xfer);
}
if(rx_len > 0)
{
xfer.txData = NULL;
xfer.rxData = rx_data;
xfer.dataSize = rx_len;
SPI_MasterTransferBlocking(SPI3, &xfer);
}
return SPIFLASH_OK;
}
void lpc_spiflash_spi_cs(spiflash_t *spi, uint8_t cs)
{
GPIO_PinWrite(BOARD_INITPINS_FLASH_CS_GPIO, BOARD_INITPINS_FLASH_CS_PORT, BOARD_INITPINS_FLASH_CS_PIN, !cs);
}
void lpc_spiflash_wait(spiflash_t *spi, uint32_t ms)
{
delay_ms(ms);
}
static const spiflash_hal_t my_spiflash_hal = {
._spiflash_spi_txrx = lpc_spiflash_spi_txrx,
._spiflash_spi_cs = lpc_spiflash_spi_cs,
._spiflash_wait = lpc_spiflash_wait
};
