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CMSIS-Driver
Version 2.8.0
Peripheral Interface for Middleware and Application Code
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CMSIS-Driver
Version 2.8.0
Peripheral Interface for Middleware and Application Code
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Specify the bus speed mode. More...
Macros | |
| #define | ARM_MCI_BUS_DEFAULT_SPEED (0x00UL) |
| SD/MMC: Default Speed mode up to 25/26MHz. More... | |
| #define | ARM_MCI_BUS_HIGH_SPEED (0x01UL) |
| SD/MMC: High Speed mode up to 50/52MHz. More... | |
| #define | ARM_MCI_BUS_UHS_SDR12 (0x02UL) |
| SD: SDR12 (Single Data Rate) up to 25MHz, 12.5MB/s: UHS-I (Ultra High Speed) 1.8V signaling. More... | |
| #define | ARM_MCI_BUS_UHS_SDR25 (0x03UL) |
| SD: SDR25 (Single Data Rate) up to 50MHz, 25 MB/s: UHS-I (Ultra High Speed) 1.8V signaling. More... | |
| #define | ARM_MCI_BUS_UHS_SDR50 (0x04UL) |
| SD: SDR50 (Single Data Rate) up to 100MHz, 50 MB/s: UHS-I (Ultra High Speed) 1.8V signaling. More... | |
| #define | ARM_MCI_BUS_UHS_SDR104 (0x05UL) |
| SD: SDR104 (Single Data Rate) up to 208MHz, 104 MB/s: UHS-I (Ultra High Speed) 1.8V signaling. More... | |
| #define | ARM_MCI_BUS_UHS_DDR50 (0x06UL) |
| SD: DDR50 (Dual Data Rate) up to 50MHz, 50 MB/s: UHS-I (Ultra High Speed) 1.8V signaling. More... | |
Specify the bus speed mode.
The function ARM_MCI_Control with control = ARM_MCI_BUS_SPEED configures the bus speed of the MCI to the requested bits/s specified with arg.
The function ARM_MCI_Control with control = ARM_MCI_BUS_SPEED_MODE configures the bus speed mode of the MCI as specified with arg listed bellow.
The function ARM_MCI_GetCapabilities lists the supported bus speed modes. Initially, all SD cards use a 3.3 volt electrical interface. Some SD cards can switch to 1.8 volt operation. For example, the use of ultra-high-speed (UHS) SD cards requires 1.8 volt operation and a 4-bit bus data width. The data field uhs_signaling of the structure ARM_MCI_CAPABILITIES encodes whether the driver supports 1.8 volt UHS signaling.
The following codes are defined:
| #define ARM_MCI_BUS_DEFAULT_SPEED (0x00UL) |
SD/MMC: Default Speed mode up to 25/26MHz.
| #define ARM_MCI_BUS_HIGH_SPEED (0x01UL) |
SD/MMC: High Speed mode up to 50/52MHz.
| #define ARM_MCI_BUS_UHS_SDR12 (0x02UL) |
SD: SDR12 (Single Data Rate) up to 25MHz, 12.5MB/s: UHS-I (Ultra High Speed) 1.8V signaling.
| #define ARM_MCI_BUS_UHS_SDR25 (0x03UL) |
SD: SDR25 (Single Data Rate) up to 50MHz, 25 MB/s: UHS-I (Ultra High Speed) 1.8V signaling.
| #define ARM_MCI_BUS_UHS_SDR50 (0x04UL) |
SD: SDR50 (Single Data Rate) up to 100MHz, 50 MB/s: UHS-I (Ultra High Speed) 1.8V signaling.
| #define ARM_MCI_BUS_UHS_SDR104 (0x05UL) |
SD: SDR104 (Single Data Rate) up to 208MHz, 104 MB/s: UHS-I (Ultra High Speed) 1.8V signaling.
| #define ARM_MCI_BUS_UHS_DDR50 (0x06UL) |
SD: DDR50 (Dual Data Rate) up to 50MHz, 50 MB/s: UHS-I (Ultra High Speed) 1.8V signaling.
