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/*
ChibiOS/RT - Copyright (C) 2006,2007,2008,2009,2010 Giovanni Di Sirio.
This file is part of ChibiOS/RT.
ChibiOS/RT is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
ChibiOS/RT is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/**
* @file STM32/uart_lld.h
* @brief STM32 low level UART driver header.
*
* @addtogroup STM32_UART
* @{
*/
#ifndef _UART_LLD_H_
#define _UART_LLD_H_
#if CH_HAL_USE_UART || defined(__DOXYGEN__)
/*===========================================================================*/
/* Driver constants. */
/*===========================================================================*/
/*===========================================================================*/
/* Driver pre-compile time settings. */
/*===========================================================================*/
/**
* @brief UART driver on USART1 enable switch.
* @details If set to @p TRUE the support for USART1 is included.
* @note The default is @p FALSE.
*/
#if !defined(STM32_UART_USE_USART1) || defined(__DOXYGEN__)
#define STM32_UART_USE_USART1 TRUE
#endif
/**
* @brief UART driver on USART2 enable switch.
* @details If set to @p TRUE the support for USART2 is included.
* @note The default is @p FALSE.
*/
#if !defined(STM32_UART_USE_USART2) || defined(__DOXYGEN__)
#define STM32_UART_USE_USART2 TRUE
#endif
/**
* @brief UART driver on USART3 enable switch.
* @details If set to @p TRUE the support for USART3 is included.
* @note The default is @p FALSE.
*/
#if !defined(STM32_UART_USE_USART3) || defined(__DOXYGEN__)
#define STM32_UART_USE_USART3 TRUE
#endif
/**
* @brief USART1 interrupt priority level setting.
*/
#if !defined(STM32_UART_USART1_IRQ_PRIO) || defined(__DOXYGEN__)
#define STM32_UART_USART1_IRQ_PRIORITY 12
#endif
/**
* @brief USART2 interrupt priority level setting.
*/
#if !defined(STM32_UART_USART2_IRQ_PRIO) || defined(__DOXYGEN__)
#define STM32_UART_USART2_IRQ_PRIORITY 12
#endif
/**
* @brief USART3 interrupt priority level setting.
*/
#if !defined(STM32_UART_USART3_IRQ_PRIO) || defined(__DOXYGEN__)
#define STM32_UART_USART3_IRQ_PRIORITY 12
#endif
/**
* @brief USART1 DMA priority (0..3|lowest..highest).
* @note The priority level is used for both the TX and RX DMA channels but
* because of the channels ordering the RX channel has always priority
* over the TX channel.
*/
#if !defined(STM32_UART_USART1_DMA_PRIO) || defined(__DOXYGEN__)
#define STM32_UART_USART1_DMA_PRIORITY 0
#endif
/**
* @brief USART2 DMA priority (0..3|lowest..highest).
* @note The priority level is used for both the TX and RX DMA channels but
* because of the channels ordering the RX channel has always priority
* over the TX channel.
*/
#if !defined(STM32_UART_USART2_DMA_PRIO) || defined(__DOXYGEN__)
#define STM32_UART_USART2_DMA_PRIORITY 0
#endif
/**
* @brief USART3 DMA priority (0..3|lowest..highest).
* @note The priority level is used for both the TX and RX DMA channels but
* because of the channels ordering the RX channel has always priority
* over the TX channel.
*/
#if !defined(STM32_UART_USART3_DMA_PRIO) || defined(__DOXYGEN__)
#define STM32_UART_USART3_DMA_PRIORITY 0
#endif
/**
* @brief USART1 DMA error hook.
* @note The default action for DMA errors is a system halt because DMA error
* can only happen because programming errors.
*/
#if !defined(STM32_UART_USART1_DMA_ERROR_HOOK) || defined(__DOXYGEN__)
#define STM32_UART_USART1_DMA_ERROR_HOOK() chSysHalt()
#endif
/**
* @brief USART2 DMA error hook.
* @note The default action for DMA errors is a system halt because DMA error
* can only happen because programming errors.
*/
#if !defined(STM32_UART_USART2_DMA_ERROR_HOOK) || defined(__DOXYGEN__)
#define STM32_UART_USART2_DMA_ERROR_HOOK() chSysHalt()
#endif
/**
* @brief USART3 DMA error hook.
* @note The default action for DMA errors is a system halt because DMA error
* can only happen because programming errors.
*/
#if !defined(STM32_UART_USART3_DMA_ERROR_HOOK) || defined(__DOXYGEN__)
#define STM32_UART_USART3_DMA_ERROR_HOOK() chSysHalt()
#endif
/*===========================================================================*/
/* Derived constants and error checks. */
/*===========================================================================*/
#if STM32_UART_USE_UART4 && \
!(defined(STM32F10X_HD) || defined(STM32F10X_CL))
#error "UART4 only present in HD and CL devices"
#endif
#if !STM32_UART_USE_USART1 && !STM32_UART_USE_USART2 && \
!STM32_UART_USE_USART3 && !STM32_UART_USE_UART4
#error "UART driver activated but no USART/UART peripheral assigned"
#endif
/*===========================================================================*/
/* Driver data structures and types. */
/*===========================================================================*/
/**
* @brief UART driver condition flags type.
*/
typedef uint32_t uartflags_t;
/**
* @brief Structure representing an UART driver.
*/
typedef struct UARTDriver UARTDriver;
/**
* @brief Generic UART notification callback type.
*
* @param[in] uartp pointer to the @p UARTDriver object
*/
typedef void (*uartcb_t)(UARTDriver *uartp);
/**
* @brief Character received UART notification callback type.
*
* @param[in] uartp pointer to the @p UARTDriver object
* @param[in] c received character
*/
typedef void (*uartccb_t)(UARTDriver *uartp, uint16_t c);
/**
* @brief Receive error UART notification callback type.
*
* @param[in] uartp pointer to the @p UARTDriver object
* @param[in] e receive error mask
*/
typedef void (*uartecb_t)(UARTDriver *uartp, uartflags_t e);
/**
* @brief Driver configuration structure.
* @note It could be empty on some architectures.
*/
typedef struct {
/** @brief End of transmission buffer callback.*/
uartcb_t uc_txend1;
/** @brief Physical end of transmission callback.*/
uartcb_t uc_txend2;
/** @brief Receive buffer filled callback.*/
uartcb_t uc_rxend;
/** @brief Character received while out if the @p UART_RECEIVE state.*/
uartccb_t uc_rxchar;
/** @brief Receive error callback.*/
uartecb_t uc_rxerr;
/* End of the mandatory fields.*/
/** @brief Bit rate.*/
uint32_t uc_speed;
/** @brief Initialization value for the CR1 register.*/
uint16_t uc_cr1;
/** @brief Initialization value for the CR2 register.*/
uint16_t uc_cr2;
/** @brief Initialization value for the CR3 register.*/
uint16_t uc_cr3;
} UARTConfig;
/**
* @brief Structure representing an UART driver.
*/
struct UARTDriver {
/** @brief Driver state.*/
uartstate_t ud_state;
/** @brief Current configuration data.*/
const UARTConfig *ud_config;
/** @brief Transmitter state.*/
uarttxstate_t ud_txstate;
/** @brief Receiver state.*/
uartrxstate_t ud_rxstate;
/** @brief UART driver status flags.*/
uartflags_t ud_flags;
#if defined(UART_DRIVER_EXT_FIELDS)
UART_DRIVER_EXT_FIELDS
#endif
/* End of the mandatory fields.*/
/** @brief Pointer to the USART registers block.*/
USART_TypeDef *ud_usart;
/** @brief Pointer to the DMA registers block.*/
stm32_dma_t *ud_dmap;
/** @brief DMA priority bit mask.*/
uint32_t ud_dmaccr;
/** @brief Receive DMA channel.*/
uint8_t ud_dmarx;
/** @brief Transmit DMA channel.*/
uint8_t ud_dmatx;
/** @brief Default receive buffer while into @p UART_RX_IDLE state.*/
volatile uint16_t ud_rxbuf;
};
/*===========================================================================*/
/* Driver macros. */
/*===========================================================================*/
/*===========================================================================*/
/* External declarations. */
/*===========================================================================*/
#if STM32_UART_USE_USART1 && !defined(__DOXYGEN__)
extern UARTDriver UARTD1;
#endif
#if STM32_UART_USE_USART2 && !defined(__DOXYGEN__)
extern UARTDriver UARTD2;
#endif
#if STM32_UART_USE_USART3 && !defined(__DOXYGEN__)
extern UARTDriver UARTD3;
#endif
#ifdef __cplusplus
extern "C" {
#endif
void uart_lld_init(void);
void uart_lld_start(UARTDriver *uartp);
void uart_lld_stop(UARTDriver *uartp);
void uart_lld_start_send(UARTDriver *uartp, size_t n, const void *txbuf);
size_t uart_lld_stop_send(UARTDriver *uartp);
void uart_lld_start_receive(UARTDriver *uartp, size_t n, void *rxbuf);
size_t uart_lld_stop_receive(UARTDriver *uartp);
#ifdef __cplusplus
}
#endif
#endif /* CH_HAL_USE_UART */
#endif /* _UART_LLD_H_ */
/** @} */
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