CMSIS-Driver for MCI Interface Setup
The CMSIS-Driver for MCI Interface requires:
Valid pin settings for USDHC1 peripheral on EVKB-IMXRT1050 evaluation board are listed in the table below:
# | Peripheral | Signal | Route to | Identifier | Direction | Pull Up/Down Config | Pull/Keeper select | Pull/Keeper enable | Drive strength | Slew rate |
---|---|---|---|---|---|---|---|---|---|---|
J2 | USDHC1 | DATA,3 | GPIO_SD_B0_05 | SD1_D3 | Input/Output | 47k Ohm Pull Up | Pull | Enabled | R0 | Fast |
H2 | USDHC1 | DATA,2 | GPIO_SD_B0_04 | SD1_D2 | Input/Output | 47k Ohm Pull Up | Pull | Enabled | R0 | Fast |
K1 | USDHC1 | DATA,1 | GPIO_SD_B0_03 | SD1_D1 | Input/Output | 47k Ohm Pull Up | Pull | Enabled | R0 | Fast |
J1 | USDHC1 | DATA,0 | GPIO_SD_B0_02 | SD1_D0 | Input/Output | 47k Ohm Pull Up | Pull | Enabled | R0 | Fast |
J4 | USDHC1 | CMD | GPIO_SD_B0_00 | SD1_CMD | Input/Output | 47k Ohm Pull Up | Pull | Enabled | R0 | Fast |
J3 | USDHC1 | CLK | GPIO_SD_B0_01 | SD1_CLK | Output | 100k Ohm Pull Down | Keeper | Disabled | R0 | Fast |
D13 | GPIO2 | goio_io,28 | GPIO_B1_12 | SD1_CD | Not specified | 100k Ohm Pull Down | Keeper | Enabled | R0/6 | Slow |
The rest of the settings can be at the default (reset) value.
For other boards or custom hardware, refer to the hardware schematics to reflect correct setup values.
This driver uses special signal identifiers in order to enable SD Card Detect and Write Protect pin functionality. These identifiers can be optionally used and must be assigned to signal connected to card detect or write protect pin on SD card socket. Each MCI driver instance uses its own identifiers which can be assigned to signals as follows:
MCI instance | Peripheral | Identifier | Functionality |
---|---|---|---|
0 | USDHC1 | SD1_CD | Card Detect |
0 | USDHC1 | SD1_WP | Write Protect |
1 | USDHC2 | SD2_CD | Card Detect |
1 | USDHC2 | SD2_WP | Write Protect |
In the MCUXpresso Config Tools, make sure that the following pin and clock settings are made (enter the values that are shown in italics):