michaelh/zephyr
1
0
Fork 0
Code Releases Activity

boards: arm: mimxrt1020_evk: SD Card

Browse source 
Porting code from mimxrt1050_evk to this board to enable use of the SD
card.  Note that this board does not have the power pin connected to the
SD card and must use the no-1-8-v option for the USDHC driver as in
PR #34205 for the mm_swiftio.

Tested with samples/subsys/fs/fat_fs.

Signed-off-by: Jake Mercer <jake.mercer@civica.co.uk>
This commit is contained in:
Jake Mercer 2021-05-14 17:40:24 +01:00 • committed by Kumar Gala
commit 28f0a7a2ac
4 changed files with 111 additions and 0 deletions
Download patch file Download diff file Expand all files Collapse all files

3
boards/arm/mimxrt1020_evk/Kconfig.defconfig
View file

@ -12,6 +12,9 @@ choice CODE_LOCATION
default CODE_FLEXSPI
endchoice
config DISK_DRIVER_SDMMC
default y if DISK_DRIVERS
if NETWORKING
config NET_L2_ETHERNET

18
boards/arm/mimxrt1020_evk/doc/index.rst
View file

@ -77,6 +77,8 @@ features:
+-----------+------------+-------------------------------------+
| I2C | on-chip | i2c |
+-----------+------------+-------------------------------------+
| SDHC | on-chip | disk access |
+-----------+------------+-------------------------------------+
| UART | on-chip | serial port-polling; |
| | | serial port-interrupt |
+-----------+------------+-------------------------------------+
@ -142,6 +144,22 @@ The MIMXRT1020 SoC has five pairs of pinmux/gpio controllers.
+---------------+-----------------+---------------------------+
| GPIO_EMC_40 | ENET_MDIO | Ethernet |
+---------------+-----------------+---------------------------+
| GPIO_AD_B1_07 | USDHC1_VSELECT | SD Card |
+---------------+-----------------+---------------------------+
| GPIO_SD_B0_02 | USDHC1_CMD | SD Card |
+---------------+-----------------+---------------------------+
| GPIO_SD_B0_03 | USDHC1_CLK | SD Card |
+---------------+-----------------+---------------------------+
| GPIO_SD_B0_04 | USDHC1_DATA0 | SD Card |
+---------------+-----------------+---------------------------+
| GPIO_SD_B0_05 | USDHC1_DATA1 | SD Card |
+---------------+-----------------+---------------------------+
| GPIO_SD_B0_00 | USDHC1_DATA2 | SD Card |
+---------------+-----------------+---------------------------+
| GPIO_SD_B0_01 | USDHC1_DATA3 | SD Card |
+---------------+-----------------+---------------------------+
| GPIO_SD_B0_06 | USDHC1_CD_B | SD Card |
+---------------+-----------------+---------------------------+
System Clock
============

6
boards/arm/mimxrt1020_evk/mimxrt1020_evk.dts
View file

@ -116,3 +116,9 @@ arduino_serial: &lpuart2 {};
&usb1 {
status = "okay";
};
&usdhc1 {
status = "okay";
cd-gpios = <&gpio1 23 GPIO_ACTIVE_LOW>;
no-1-8-v;
};

84
boards/arm/mimxrt1020_evk/pinmux.c
View file

@ -16,6 +16,85 @@ static gpio_pin_config_t enet_gpio_config = {
};
#endif
#if DT_NODE_HAS_STATUS(DT_NODELABEL(usdhc1), okay) && CONFIG_DISK_DRIVER_SDMMC
/*Drive Strength Field: R0(260 Ohm @ 3.3V, 150 Ohm@1.8V, 240 Ohm for DDR)
*Speed Field: medium(100MHz)
*Open Drain Enable Field: Open Drain Disabled
*Pull / Keep Enable Field: Pull/Keeper Enabled
*Pull / Keep Select Field: Pull
*Pull Up / Down Config. Field: 47K Ohm Pull Up
*Hyst. Enable Field: Hysteresis Enabled.
*/
static void mimxrt1020_evk_usdhc_pinmux(
uint16_t nusdhc, bool init,
uint32_t speed, uint32_t strength)
{
uint32_t cmd_data = IOMUXC_SW_PAD_CTL_PAD_SPEED(speed) |
IOMUXC_SW_PAD_CTL_PAD_SRE_MASK |
IOMUXC_SW_PAD_CTL_PAD_PKE_MASK |
IOMUXC_SW_PAD_CTL_PAD_PUE_MASK |
IOMUXC_SW_PAD_CTL_PAD_HYS_MASK |
IOMUXC_SW_PAD_CTL_PAD_PUS(1) |
IOMUXC_SW_PAD_CTL_PAD_DSE(strength);
uint32_t clk = IOMUXC_SW_PAD_CTL_PAD_SPEED(speed) |
IOMUXC_SW_PAD_CTL_PAD_SRE_MASK |
IOMUXC_SW_PAD_CTL_PAD_HYS_MASK |
IOMUXC_SW_PAD_CTL_PAD_PUS(0) |
IOMUXC_SW_PAD_CTL_PAD_DSE(strength);
if (nusdhc == 0) {
if (init) {
IOMUXC_SetPinMux(/*SD_CD*/
IOMUXC_GPIO_SD_B0_06_USDHC1_CD_B,
0U);
IOMUXC_SetPinMux(
IOMUXC_GPIO_AD_B1_07_USDHC1_VSELECT,
0U);
IOMUXC_SetPinMux(
IOMUXC_GPIO_SD_B0_02_USDHC1_CMD,
0U);
IOMUXC_SetPinMux(
IOMUXC_GPIO_SD_B0_03_USDHC1_CLK,
0U);
IOMUXC_SetPinMux(
IOMUXC_GPIO_SD_B0_04_USDHC1_DATA0,
0U);
IOMUXC_SetPinMux(
IOMUXC_GPIO_SD_B0_05_USDHC1_DATA1,
0U);
IOMUXC_SetPinMux(
IOMUXC_GPIO_SD_B0_00_USDHC1_DATA2,
0U);
IOMUXC_SetPinMux(
IOMUXC_GPIO_SD_B0_01_USDHC1_DATA3,
0U);
IOMUXC_SetPinConfig(/*SD0_CD_SW*/
IOMUXC_GPIO_SD_B0_06_USDHC1_CD_B,
0x017089u);
IOMUXC_SetPinConfig(/*SD0_VSELECT*/
IOMUXC_GPIO_AD_B1_07_USDHC1_VSELECT,
0x0170A1u);
}
IOMUXC_SetPinConfig(IOMUXC_GPIO_SD_B0_02_USDHC1_CMD,
cmd_data);
IOMUXC_SetPinConfig(IOMUXC_GPIO_SD_B0_03_USDHC1_CLK,
clk);
IOMUXC_SetPinConfig(IOMUXC_GPIO_SD_B0_04_USDHC1_DATA0,
cmd_data);
IOMUXC_SetPinConfig(IOMUXC_GPIO_SD_B0_05_USDHC1_DATA1,
cmd_data);
IOMUXC_SetPinConfig(IOMUXC_GPIO_SD_B0_00_USDHC1_DATA2,
cmd_data);
IOMUXC_SetPinConfig(IOMUXC_GPIO_SD_B0_01_USDHC1_DATA3,
cmd_data);
}
}
#endif
static int mimxrt1020_evk_init(const struct device *dev)
{
ARG_UNUSED(dev);
@ -144,6 +223,11 @@ static int mimxrt1020_evk_init(const struct device *dev)
GPIO_WritePinOutput(GPIO1, 4, 0);
#endif
#if DT_NODE_HAS_STATUS(DT_NODELABEL(usdhc1), okay) && CONFIG_DISK_DRIVER_SDMMC
mimxrt1020_evk_usdhc_pinmux(0, true, 2, 1);
imxrt_usdhc_pinmux_cb_register(mimxrt1020_evk_usdhc_pinmux);
#endif
return 0;
}