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SDMMC frequency selection based on board type (#5688)

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* SDMMC frequency selection based on board type

On Olimex ESP32 EVB I/O operations with SD card can cause error when LAN is used in same time.
Problem is disappearing if SD MMC frequency lower down from SDMMC_FREQ_HIGHSPEED to SDMMC_FREQ_DEFAULT.

No problem if WiFi used instead LAN.

* Code rewritten according to https://github.com/espressif/arduino-esp32/pull/5688#pullrequestreview-759359645
This commit is contained in:
Serguei S. Dukachev
2021-10-01 15:48:20 +03:00
committed by GitHub
parent 67583e84d6
commit 93f10609f4
3 changed files with 11 additions and 3 deletions
Download Patch File Download Diff File Expand all files Collapse all files

4
libraries/SD_MMC/src/SD_MMC.cpp
View File

@ -36,7 +36,7 @@ SDMMCFS::SDMMCFS(FSImplPtr impl)
: FS(impl), _card(NULL)
{}
bool SDMMCFS::begin(const char * mountpoint, bool mode1bit, bool format_if_mount_failed)
bool SDMMCFS::begin(const char * mountpoint, bool mode1bit, bool format_if_mount_failed, int sdmmc_frequency)
{
if(_card) {
return true;
@ -46,7 +46,7 @@ bool SDMMCFS::begin(const char * mountpoint, bool mode1bit, bool format_if_mount
sdmmc_host_t host;
host.flags = SDMMC_HOST_FLAG_4BIT;
host.slot = SDMMC_HOST_SLOT_1;
host.max_freq_khz = SDMMC_FREQ_HIGHSPEED;
host.max_freq_khz = sdmmc_frequency;
host.io_voltage = 3.3f;
host.init = &sdmmc_host_init;
host.set_bus_width = &sdmmc_host_set_bus_width;

9
libraries/SD_MMC/src/SD_MMC.h
View File

@ -21,6 +21,13 @@
#include "driver/sdmmc_types.h"
#include "sd_defines.h"
// If reading/writing to the SD card is unstable,
// you can define BOARD_MAX_SDMMC_FREQ with lower value (Ex. SDMMC_FREQ_DEFAULT)
// in pins_arduino.h for your board variant.
#ifndef BOARD_MAX_SDMMC_FREQ
#define BOARD_MAX_SDMMC_FREQ SDMMC_FREQ_HIGHSPEED
#endif
namespace fs
{
@ -31,7 +38,7 @@ protected:
public:
SDMMCFS(FSImplPtr impl);
bool begin(const char * mountpoint="/sdcard", bool mode1bit=false, bool format_if_mount_failed=false);
bool begin(const char * mountpoint="/sdcard", bool mode1bit=false, bool format_if_mount_failed=false, int sdmmc_frequency=BOARD_MAX_SDMMC_FREQ);
void end();
sdcard_type_t cardType();
uint64_t cardSize();

1
variants/esp32-evb/pins_arduino.h
View File

@ -29,5 +29,6 @@ static const uint8_t MISO = 15;
static const uint8_t SCK = 14;
#define BOARD_HAS_1BIT_SDMMC
#define BOARD_MAX_SDMMC_FREQ SDMMC_FREQ_DEFAULT
#endif /* Pins_Arduino_h */