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If the system is busy with other interrupts and the UART is set to a fast baud rate, it's possible to loose UART interrupts and therefore characters. This allows to optionally enable a DMA for the UARTs so that a number of lost interrupts can be tolerated. The number of DMAs on this chip is limited and not not all applications need that feature. Therefore the DMA is disabled by default. Close #4577
132 lines
2.9 KiB
C
132 lines
2.9 KiB
C
/**
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* @file
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*
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* @ingroup RTEMSBSPsARMAtsam
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*/
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/*
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* Copyright (c) 2016 embedded brains GmbH. All rights reserved.
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*
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* embedded brains GmbH
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* Dornierstr. 4
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* 82178 Puchheim
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* Germany
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* <rtems@embedded-brains.de>
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*
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* The license and distribution terms for this file may be
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* found in the file LICENSE in this distribution or at
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* http://www.rtems.org/license/LICENSE.
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*/
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#ifndef LIBBSP_ARM_ATSAM_BSP_H
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#define LIBBSP_ARM_ATSAM_BSP_H
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/**
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* @defgroup RTEMSBSPsARMAtsam Atmel/Microchip SAM E70, S70, V70 and V71
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*
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* @ingroup RTEMSBSPsARM
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*
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* @brief Atmel/Microchip SAM E70, S70, V70 and V71 Board Support Package.
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*
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* @{
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*/
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#include <bspopts.h>
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#include <bsp/default-initial-extension.h>
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#include <sys/ioccom.h>
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#include <rtems.h>
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#ifdef __cplusplus
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extern "C" {
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#endif /* __cplusplus */
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#define BSP_FEATURE_IRQ_EXTENSION
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#define BSP_ARMV7M_IRQ_PRIORITY_DEFAULT (13 << 4)
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#define BSP_ARMV7M_SYSTICK_PRIORITY (14 << 4)
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uint32_t atsam_systick_frequency(void);
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#define BSP_ARMV7M_SYSTICK_FREQUENCY atsam_systick_frequency()
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struct rtems_bsdnet_ifconfig;
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int if_atsam_attach(struct rtems_bsdnet_ifconfig *config, int attaching);
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#define RTEMS_BSP_NETWORK_DRIVER_NAME "atsam0"
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#define RTEMS_BSP_NETWORK_DRIVER_ATTACH if_atsam_attach
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/**
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* @brief Interface driver configuration.
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*/
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typedef struct {
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/**
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* @brief Maximum retries for MDIO communication.
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*/
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uint32_t mdio_retries;
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/**
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* @brief Address of PHY.
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*
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* Use 0xff to search for a PHY.
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*/
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uint8_t phy_addr;
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} if_atsam_config;
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extern char atsam_memory_dtcm_begin[];
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extern char atsam_memory_dtcm_end[];
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extern char atsam_memory_dtcm_size[];
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extern char atsam_memory_intflash_begin[];
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extern char atsam_memory_intflash_end[];
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extern char atsam_memory_intflash_size[];
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extern char atsam_memory_intsram_begin[];
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extern char atsam_memory_intsram_end[];
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extern char atsam_memory_intsram_size[];
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extern char atsam_memory_itcm_begin[];
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extern char atsam_memory_itcm_end[];
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extern char atsam_memory_itcm_size[];
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extern char atsam_memory_nocache_begin[];
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extern char atsam_memory_nocache_end[];
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extern char atsam_memory_nocache_size[];
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extern char atsam_memory_qspiflash_begin[];
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extern char atsam_memory_qspiflash_end[];
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extern char atsam_memory_qspiflash_size[];
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extern char atsam_memory_sdram_begin[];
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extern char atsam_memory_sdram_end[];
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extern char atsam_memory_sdram_size[];
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void atsam_rtc_get_time(rtems_time_of_day *tod);
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void bsp_restart( const void *const addr );
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/*
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* This ioctl enables the receive DMA for an UART. The DMA can be usefull if you
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* loose characters in high interrupt load situations.
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*
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* Disabling the DMA again is only possible by closing all file descriptors of
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* that UART.
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*
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* Note that every UART needs one DMA channel and the system has only a limited
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* amount of DMAs. So only use it if you need it.
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*/
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#define ATSAM_UART_ENABLE_RX_DMA _IO('d', 0)
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#ifdef __cplusplus
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}
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#endif /* __cplusplus */
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/** @} */
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#endif /* LIBBSP_ARM_ATSAM_BSP_H */
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