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firmware/main: Fix SPI Xfer and always read the byte from HW 

Without that the SPI_SR_RRDY bit isn't cleared for the next
transfer.

It uses to works simply because the PicoRV32 wasn't fast enough ...

Signed-off-by: Sylvain Munaut <tnt@246tNt.com>
This commit is contained in:
Sylvain Munaut 2023-03-23 07:38:52 +01:00
parent 2188b231be
commit 5a98883e03
1 changed files with 4 additions and 1 deletions
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5
firmware/main/spi.c
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@ -68,6 +68,8 @@ spi_init(void)
void
spi_xfer(unsigned cs, struct spi_xfer_chunk *xfer, unsigned n)
{
uint8_t rxd;
/* Setup CS */
spi_regs->csr = 0xf ^ (1 << cs);
@ -77,8 +79,9 @@ spi_xfer(unsigned cs, struct spi_xfer_chunk *xfer, unsigned n)
{
spi_regs->txdr = xfer->write ? xfer->data[i] : 0x00;
while (!(spi_regs->sr & SPI_SR_RRDY));
rxd = spi_regs->rxdr;
if (xfer->read)
xfer->data[i] = spi_regs->rxdr;
xfer->data[i] = rxd;
}
xfer++;
}