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Use strong drive and hysteresis for FlexSPI2 pins

teensy4-core
PaulStoffregen 4 years ago
parent
commit
6cbabcd3c7
1 changed files with 8 additions and 8 deletions
  1. +8
    -8
      teensy4/startup.c

+ 8
- 8
teensy4/startup.c View File

FLASHMEM void configure_external_ram() FLASHMEM void configure_external_ram()
{ {
// initialize pins // initialize pins
IOMUXC_SW_PAD_CTL_PAD_GPIO_EMC_22 = 0xB0E1; // 100K pullup, medium drive, max speed
IOMUXC_SW_PAD_CTL_PAD_GPIO_EMC_23 = 0x10E1; // keeper, medium drive, max speed
IOMUXC_SW_PAD_CTL_PAD_GPIO_EMC_24 = 0xB0E1; // 100K pullup, medium drive, max speed
IOMUXC_SW_PAD_CTL_PAD_GPIO_EMC_25 = 0x00E1; // medium drive, max speed
IOMUXC_SW_PAD_CTL_PAD_GPIO_EMC_26 = 0x70E1; // 47K pullup, medium drive, max speed
IOMUXC_SW_PAD_CTL_PAD_GPIO_EMC_27 = 0x70E1; // 47K pullup, medium drive, max speed
IOMUXC_SW_PAD_CTL_PAD_GPIO_EMC_28 = 0x70E1; // 47K pullup, medium drive, max speed
IOMUXC_SW_PAD_CTL_PAD_GPIO_EMC_29 = 0x70E1; // 47K pullup, medium drive, max speed
IOMUXC_SW_PAD_CTL_PAD_GPIO_EMC_22 = 0x1B0F9; // 100K pullup, strong drive, max speed, hyst
IOMUXC_SW_PAD_CTL_PAD_GPIO_EMC_23 = 0x110F9; // keeper, strong drive, max speed, hyst
IOMUXC_SW_PAD_CTL_PAD_GPIO_EMC_24 = 0x1B0F9; // 100K pullup, strong drive, max speed, hyst
IOMUXC_SW_PAD_CTL_PAD_GPIO_EMC_25 = 0x100F9; // strong drive, max speed, hyst
IOMUXC_SW_PAD_CTL_PAD_GPIO_EMC_26 = 0x170F9; // 47K pullup, strong drive, max speed, hyst
IOMUXC_SW_PAD_CTL_PAD_GPIO_EMC_27 = 0x170F9; // 47K pullup, strong drive, max speed, hyst
IOMUXC_SW_PAD_CTL_PAD_GPIO_EMC_28 = 0x170F9; // 47K pullup, strong drive, max speed, hyst
IOMUXC_SW_PAD_CTL_PAD_GPIO_EMC_29 = 0x170F9; // 47K pullup, strong drive, max speed, hyst


IOMUXC_SW_MUX_CTL_PAD_GPIO_EMC_22 = 8 | 0x10; // ALT1 = FLEXSPI2_A_SS1_B (Flash) IOMUXC_SW_MUX_CTL_PAD_GPIO_EMC_22 = 8 | 0x10; // ALT1 = FLEXSPI2_A_SS1_B (Flash)
IOMUXC_SW_MUX_CTL_PAD_GPIO_EMC_23 = 8 | 0x10; // ALT1 = FLEXSPI2_A_DQS IOMUXC_SW_MUX_CTL_PAD_GPIO_EMC_23 = 8 | 0x10; // ALT1 = FLEXSPI2_A_DQS

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