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feature(sdio): allow to enable internal pullups of the SDIO host and slave as a debug feature

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NOTE: the internal pullups are not totally reliable, please do add external pullups on your bus.
This commit is contained in:
michael
2018-05-25 19:44:53 +08:00
parent e1a6e71486
commit 5b37a96ddc
13 changed files with 397 additions and 131 deletions
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19
components/driver/include/driver/sdio_slave.h
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@@ -20,7 +20,7 @@
#include "esp_err.h"
#include "rom/queue.h"
#include "soc/host_reg.h"
#include "soc/sdio_slave_periph.h"
#ifdef __cplusplus
extern "C" {
@@ -71,6 +71,23 @@ typedef struct {
///< All data that do not fully fill a buffer is still counted as one buffer. E.g. 10 bytes data costs 2 buffers if the size is 8 bytes per buffer.
///< Buffer size of the slave pre-defined between host and slave before communication. All receive buffer given to the driver should be larger than this.
sdio_event_cb_t event_cb; ///< when the host interrupts slave, this callback will be called with interrupt number (0-7).
uint32_t flags; ///< Features to be enabled for the slave, combinations of ``SDIO_SLAVE_FLAG_*``.
#define SDIO_SLAVE_FLAG_DAT2_DISABLED BIT(0) /**< It is required by the SD specification that all 4 data
lines should be used and pulled up even in 1-bit mode or SPI mode. However, as a feature, the user can speicfy
this flag to make use of DAT2 pin in 1-bit mode. Note that the host cannot read CCCR registers to know we don't
support 4-bit mode anymore, please do this at your own risk.
*/
#define SDIO_SLAVE_FLAG_HOST_INTR_DISABLED BIT(1) /**< The DAT1 line is used as the interrupt line in SDIO
protocol. However, as a feature, the user can speicfy this flag to make use of DAT1 pin of the slave in 1-bit
mode. Note that the host has to do polling to the interrupt registers to know whether there are interrupts from
the slave. And it cannot read CCCR registers to know we don't support 4-bit mode anymore, please do this at
your own risk.
*/
#define SDIO_SLAVE_FLAG_INTERNAL_PULLUP BIT(2) /**< Enable internal pullups for enabled pins. It is required
by the SD specification that all the 4 data lines should be pulled up even in 1-bit mode or SPI mode. Note that
the internal pull-ups are not sufficient for stable communication, please do connect external pull-ups on the
bus. This is only for example and debug use.
*/
} sdio_slave_config_t;
/** Handle of a receive buffer, register a handle by calling ``sdio_slave_recv_register_buf``. Use the handle to load the buffer to the