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Fix SDIO send_command

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This patch fixes the problem, while receiving R1b type of response from the card.
In case of R1b response the continuous stream that the card sends must be checked whether the signal indicates busy status and wait until a non zero response.
This commit is contained in:
Robert Fancsik 2018-04-20 19:50:32 +02:00
parent 4581999feb
commit 3b5510dce1
1 changed files with 19 additions and 4 deletions
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23
extras/sdio/sdio.c
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@ -182,10 +182,6 @@ static uint8_t command(sdio_card_t *card, uint8_t cmd, uint32_t arg)
wait(); wait();
spi_transfer(BUS, buf, NULL, 6, SPI_8BIT); spi_transfer(BUS, buf, NULL, 6, SPI_8BIT);
// R1b response
if (cmd == CMD12 || cmd == CMD28 || cmd == CMD29)
spi_read_byte();
uint8_t res; uint8_t res;
for (uint8_t i = 0; i < MAX_ERR_COUNT; i ++) for (uint8_t i = 0; i < MAX_ERR_COUNT; i ++)
{ {
@ -193,6 +189,25 @@ static uint8_t command(sdio_card_t *card, uint8_t cmd, uint32_t arg)
if (!(res & BV(R1_BUSY))) if (!(res & BV(R1_BUSY)))
break; break;
} }
/** If the response is a "busy" type (R1B), then there’s some
* special handling that needs to be done. The card will
* output a continuous stream of zeros, so the end of the BUSY
* state is signaled by any nonzero response.
*/
if (cmd == CMD12 || cmd == CMD28 || cmd == CMD29)
{
for (uint8_t i = 0; i < MAX_ERR_COUNT; i ++)
{
res = spi_read_byte();
if (res != 0)
{
spi_transfer_8(BUS, 0xFF);
return SDIO_ERR_NONE;
}
}
}
return res; return res;
} }