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stm32h7: Add support for IO compensation.

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This commit is contained in:
Anthony Merlino 2021-04-10 20:09:24 -04:00 committed by David Sidrane
parent bbe875876d
commit a45b8cc17c
5 changed files with 90 additions and 5 deletions
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13
arch/arm/src/stm32h7/Kconfig
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@ -764,6 +764,19 @@ config STM32H7_UART8
endmenu # STM32H7 U[S]ART Selection
endmenu # STM32H7 Peripheral Selection
config STM32H7_SYSCFG_IOCOMPENSATION
bool "SYSCFG I/O Compensation"
default n
select STM32H7_CSI
---help---
By default the I/O compensation cell is not used. However when the I/O
output buffer speed is configured in 50 MHz or 100 MHz mode, it is
recommended to use the compensation cell for slew rate control on I/O
tf(IO)out)/tr(IO)out commutation to reduce the I/O noise on power supply.
The I/O compensation cell can be used only when the supply voltage ranges
from 2.4 to 3.6 V
menu "I2C Configuration"
depends on STM32H7_I2C

12
arch/arm/src/stm32h7/hardware/stm32h7x3xx_syscfg.h
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@ -44,7 +44,8 @@
#define STM32_SYSCFG_EXTICR3_OFFSET 0x0010 /* SYSCFG external interrupt configuration register 3 */
#define STM32_SYSCFG_EXTICR4_OFFSET 0x0014 /* SYSCFG external interrupt configuration register 4 */
#define STM32_SYSCFG_CCSR_OFFSET 0x0020 /* Compensation cell control/status register */
#define STM32_SYSCFG_CFGR_OFFSET 0x0018 /* SYSCFG configuration register */
#define STM32_SYSCFG_CCCSR_OFFSET 0x0020 /* Compensation cell control/status register */
#define STM32_SYSCFG_CCVR_OFFSET 0x0024 /* Compensation cell value register */
#define STM32_SYSCFG_CCCR_OFFSET 0x0028 /* Compensation cell code register */
#define STM32_SYSCFG_PWRCR_OFFSET 0x002c /* Power Control register */
@ -80,7 +81,7 @@
#define STM32_SYSCFG_EXTICR3 (STM32_SYSCFG_BASE + STM32_SYSCFG_EXTICR3_OFFSET)
#define STM32_SYSCFG_EXTICR4 (STM32_SYSCFG_BASE + STM32_SYSCFG_EXTICR4_OFFSET)
#define STM32_SYSCFG_CCSR (STM32_SYSCFG_BASE + STM32_SYSCFG_CCSR_OFFSET)
#define STM32_SYSCFG_CCCSR (STM32_SYSCFG_BASE + STM32_SYSCFG_CCCSR_OFFSET)
#define STM32_SYSCFG_CCVR (STM32_SYSCFG_BASE + STM32_SYSCFG_CCVR_OFFSET)
#define STM32_SYSCFG_CCCR (STM32_SYSCFG_BASE + STM32_SYSCFG_CCCR_OFFSET)
#define STM32_SYSCFG_PWRCR (STM32_SYSCFG_BASE + STM32_SYSCFG_PWRCR_OFFSET)
@ -164,9 +165,10 @@
/* Compensation cell control/status register */
/* REVISIT: Missing bitfield definitions */
#define SYSCFG_CCSR_
#define SYSCFG_CCCSR_EN (1 << 0) /* Bit 0: Compensation Cell enable */
#define SYSCFG_CCCSR_CS (1 << 1) /* Bit 1: Compensation Cell code selection */
#define SYSCFG_CCCSR_READY (1 << 8) /* Bit 8: Compensation Cell ready flag */
#define SYSCFG_CCCSR_HSLV (1 << 16) /* Bit 16: High-speed at low-voltage */
/* Compensation cell value register */

38
arch/arm/src/stm32h7/stm32_gpio.c
View File

@ -449,4 +449,42 @@ bool stm32_gpioread(uint32_t pinset)
return 0;
}
/****************************************************************************
* Name: stm32_iocompensation
*
* Description:
* Enable I/O compensation.
*
* By default the I/O compensation cell is not used. However when the I/O
* output buffer speed is configured in 50 MHz or 100 MHz mode, it is
* recommended to use the compensation cell for slew rate control on I/O
* tf(IO)out)/tr(IO)out commutation to reduce the I/O noise on power
* supply.
*
* The I/O compensation cell can be used only when the supply voltage
* ranges from 2.4 to 3.6 V.
*
* Input Parameters:
* None
*
* Returned Value:
* None
*
****************************************************************************/
void stm32_iocompensation(void)
{
/* Enable I/O Compensation. Writing '1' to the CMPCR power-down bit
* enables the I/O compensation cell.
*/
putreg32(SYSCFG_CCCSR_EN, STM32_SYSCFG_CCCSR);
/* Wait for compensation cell to become ready */
while ((getreg32(STM32_SYSCFG_CCCSR) & SYSCFG_CCCSR_READY) == 0)
{
}
}
#endif /* CONFIG_STM32H7_STM32H7X3XX || CONFIG_STM32H7_STM32H7X7XX */

25
arch/arm/src/stm32h7/stm32_gpio.h
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@ -325,6 +325,31 @@ void stm32_gpiowrite(uint32_t pinset, bool value);
bool stm32_gpioread(uint32_t pinset);
/****************************************************************************
* Name: stm32_iocompensation
*
* Description:
* Enable I/O compensation.
*
* By default the I/O compensation cell is not used. However when the I/O
* output buffer speed is configured in 50 MHz or 100 MHz mode, it is
* recommended to use the compensation cell for slew rate control on I/O
* tf(IO)out)/tr(IO)out commutation to reduce the I/O noise on power
* supply.
*
* The I/O compensation cell can be used only when the supply voltage
* ranges from 2.4 to 3.6 V.
*
* Input Parameters:
* None
*
* Returned Value:
* None
*
****************************************************************************/
void stm32_iocompensation(void);
/****************************************************************************
* Name: stm32_gpiosetevent
*

7
arch/arm/src/stm32h7/stm32_rcc.c
View File

@ -35,6 +35,7 @@
#include "arm_arch.h"
#include "hardware/stm32_flash.h"
#include "stm32_gpio.h"
#include "stm32_rcc.h"
#include "stm32_pwr.h"
@ -120,6 +121,12 @@ void stm32_clockconfig(void)
/* Enable peripheral clocking */
rcc_enableperipherals();
#ifdef CONFIG_STM32H7_SYSCFG_IOCOMPENSATION
/* Enable I/O Compensation */
stm32_iocompensation();
#endif
}
/****************************************************************************