diff options
Diffstat (limited to '')
| -rw-r--r-- | include/drivers/st/stm32_uart.h | 159 |
1 files changed, 159 insertions, 0 deletions
diff --git a/include/drivers/st/stm32_uart.h b/include/drivers/st/stm32_uart.h new file mode 100644 index 0000000..866e158 --- /dev/null +++ b/include/drivers/st/stm32_uart.h @@ -0,0 +1,159 @@ +/* + * Copyright (c) 2021-2022, STMicroelectronics - All Rights Reserved + * + * SPDX-License-Identifier: BSD-3-Clause + */ + +#ifndef STM32_UART_H +#define STM32_UART_H + +/* UART word length */ +#define STM32_UART_WORDLENGTH_7B USART_CR1_M1 +#define STM32_UART_WORDLENGTH_8B 0x00000000U +#define STM32_UART_WORDLENGTH_9B USART_CR1_M0 + +/* UART number of stop bits */ +#define STM32_UART_STOPBITS_0_5 USART_CR2_STOP_0 +#define STM32_UART_STOPBITS_1 0x00000000U +#define STM32_UART_STOPBITS_1_5 (USART_CR2_STOP_0 | USART_CR2_STOP_1) +#define STM32_UART_STOPBITS_2 USART_CR2_STOP_1 + +/* UART parity */ +#define STM32_UART_PARITY_NONE 0x00000000U +#define STM32_UART_PARITY_EVEN USART_CR1_PCE +#define STM32_UART_PARITY_ODD (USART_CR1_PCE | USART_CR1_PS) + +/* UART transfer mode */ +#define STM32_UART_MODE_RX USART_CR1_RE +#define STM32_UART_MODE_TX USART_CR1_TE +#define STM32_UART_MODE_TX_RX (USART_CR1_TE | USART_CR1_RE) + +/* UART hardware flow control */ +#define STM32_UART_HWCONTROL_NONE 0x00000000U +#define STM32_UART_HWCONTROL_RTS USART_CR3_RTSE +#define STM32_UART_HWCONTROL_CTS USART_CR3_CTSE +#define STM32_UART_HWCONTROL_RTS_CTS (USART_CR3_RTSE | USART_CR3_CTSE) + +/* UART prescaler */ +#define STM32_UART_PRESCALER_DIV1 0x00000000U +#define STM32_UART_PRESCALER_DIV2 0x00000001U +#define STM32_UART_PRESCALER_DIV4 0x00000002U +#define STM32_UART_PRESCALER_DIV6 0x00000003U +#define STM32_UART_PRESCALER_DIV8 0x00000004U +#define STM32_UART_PRESCALER_DIV10 0x00000005U +#define STM32_UART_PRESCALER_DIV12 0x00000006U +#define STM32_UART_PRESCALER_DIV16 0x00000007U +#define STM32_UART_PRESCALER_DIV32 0x00000008U +#define STM32_UART_PRESCALER_DIV64 0x00000009U +#define STM32_UART_PRESCALER_DIV128 0x0000000AU +#define STM32_UART_PRESCALER_DIV256 0x0000000BU +#define STM32_UART_PRESCALER_NB 0x0000000CU + +/* UART fifo mode */ +#define STM32_UART_FIFOMODE_EN USART_CR1_FIFOEN +#define STM32_UART_FIFOMODE_DIS 0x00000000U + +/* UART TXFIFO threshold level */ +#define STM32_UART_TXFIFO_THRESHOLD_1EIGHTHFULL 0x00000000U +#define STM32_UART_TXFIFO_THRESHOLD_1QUARTERFUL USART_CR3_TXFTCFG_0 +#define STM32_UART_TXFIFO_THRESHOLD_HALFFULL USART_CR3_TXFTCFG_1 +#define STM32_UART_TXFIFO_THRESHOLD_3QUARTERSFULL (USART_CR3_TXFTCFG_0 | USART_CR3_TXFTCFG_1) +#define STM32_UART_TXFIFO_THRESHOLD_7EIGHTHFULL USART_CR3_TXFTCFG_2 +#define STM32_UART_TXFIFO_THRESHOLD_EMPTY (USART_CR3_TXFTCFG_2 | USART_CR3_TXFTCFG_0) + +/* UART RXFIFO threshold level */ +#define STM32_UART_RXFIFO_THRESHOLD_1EIGHTHFULL 0x00000000U +#define STM32_UART_RXFIFO_THRESHOLD_1QUARTERFULL USART_CR3_RXFTCFG_0 +#define STM32_UART_RXFIFO_THRESHOLD_HALFFULL USART_CR3_RXFTCFG_1 +#define STM32_UART_RXFIFO_THRESHOLD_3QUARTERSFULL (USART_CR3_RXFTCFG_0 | USART_CR3_RXFTCFG_1) +#define STM32_UART_RXFIFO_THRESHOLD_7EIGHTHFULL USART_CR3_RXFTCFG_2 +#define STM32_UART_RXFIFO_THRESHOLD_FULL (USART_CR3_RXFTCFG_2 | USART_CR3_RXFTCFG_0) + +struct stm32_uart_init_s { + uint32_t baud_rate; /* + * Configures the UART communication + * baud rate. + */ + + uint32_t word_length; /* + * Specifies the number of data bits + * transmitted or received in a frame. + * This parameter can be a value of + * @ref STM32_UART_WORDLENGTH_*. + */ + + uint32_t stop_bits; /* + * Specifies the number of stop bits + * transmitted. This parameter can be + * a value of @ref STM32_UART_STOPBITS_*. + */ + + uint32_t parity; /* + * Specifies the parity mode. + * This parameter can be a value of + * @ref STM32_UART_PARITY_*. + */ + + uint32_t mode; /* + * Specifies whether the receive or + * transmit mode is enabled or + * disabled. This parameter can be a + * value of @ref @ref STM32_UART_MODE_*. + */ + + uint32_t hw_flow_control; /* + * Specifies whether the hardware flow + * control mode is enabled or + * disabled. This parameter can be a + * value of @ref STM32_UARTHWCONTROL_*. + */ + + uint32_t one_bit_sampling; /* + * Specifies whether a single sample + * or three samples' majority vote is + * selected. This parameter can be 0 + * or USART_CR3_ONEBIT. + */ + + uint32_t prescaler; /* + * Specifies the prescaler value used + * to divide the UART clock source. + * This parameter can be a value of + * @ref STM32_UART_PRESCALER_*. + */ + + uint32_t fifo_mode; /* + * Specifies if the FIFO mode will be + * used. This parameter can be a value + * of @ref STM32_UART_FIFOMODE_*. + */ + + uint32_t tx_fifo_threshold; /* + * Specifies the TXFIFO threshold + * level. This parameter can be a + * value of @ref + * STM32_UART_TXFIFO_THRESHOLD_*. + */ + + uint32_t rx_fifo_threshold; /* + * Specifies the RXFIFO threshold + * level. This parameter can be a + * value of @ref + * STM32_UART_RXFIFO_THRESHOLD_*. + */ +}; + +struct stm32_uart_handle_s { + uint32_t base; + uint32_t rdr_mask; +}; + +int stm32_uart_init(struct stm32_uart_handle_s *huart, + uintptr_t base_addr, + const struct stm32_uart_init_s *init); +void stm32_uart_stop(uintptr_t base_addr); +int stm32_uart_putc(struct stm32_uart_handle_s *huart, int c); +int stm32_uart_flush(struct stm32_uart_handle_s *huart); +int stm32_uart_getc(struct stm32_uart_handle_s *huart); + +#endif /* STM32_UART_H */ |