63 lines
2.0 KiB
C
63 lines
2.0 KiB
C
/**
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* @file bsp_usart.h
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* @brief USART1 support: printf retarget (polling TX), DMA TX, RX interrupt queue.
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* TX=PB6, RX=PB7, 115200 8N1.
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*/
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#ifndef __BSP_USART_H__
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#define __BSP_USART_H__
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#ifdef __cplusplus
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extern "C" {
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#endif
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#include "n32wb03x.h"
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#define BSP_USARTx USART1
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#define BSP_USART_CLK RCC_APB2_PERIPH_USART1
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#define BSP_USART_GPIO GPIOB
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#define BSP_USART_GPIO_CLK RCC_APB2_PERIPH_GPIOB
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#define BSP_USART_TX_PIN GPIO_PIN_6
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#define BSP_USART_RX_PIN GPIO_PIN_7
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#define BSP_USART_TX_GPIO_AF GPIO_AF4_USART1
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#define BSP_USART_RX_GPIO_AF GPIO_AF4_USART1
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#define BSP_USART_BAUDRATE 115200
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/* USART1 TX DMA channel (remap required on this chip) */
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#define BSP_USART_TX_DMA_CH DMA_CH1
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#define BSP_USART_TX_DMA_TC DMA_FLAG_TC1
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#define BSP_USART_TX_DMA_REMAP DMA_REMAP_USART1_TX
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#define BSP_USART_DAT_ADDR (USART1_BASE + 0x04)
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/* Pass to bsp_usart_read_byte() to block without timeout */
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#define BSP_USART_WAIT_FOREVER 0xFFFFFFFFu
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void bsp_usart_init(void);
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/* Re-apply the baud rate at runtime (keeps RX interrupt/DMA setup).
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* Used by the "uartrst" CLI command after a baud parameter change. */
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void bsp_usart_set_baud(uint32_t baud);
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/* TX: send a buffer through DMA (polled completion) */
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void bsp_usart_write_dma(const uint8_t* data, uint16_t len);
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/* RX: fetch one byte received by the RXDNE interrupt; returns 1 on success */
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int bsp_usart_read_byte(uint8_t* ch, uint32_t timeout_ms);
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/* RX: inject bytes from task context into the same RX queue (BLE downlink
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* feeds the CLI through this). Bytes are dropped when the queue is full. */
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void bsp_usart_rx_inject(const uint8_t* data, uint16_t len);
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/* TX mutex so that DMA bursts and polling printf lines do not interleave.
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* No-ops while the scheduler is not running. */
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void bsp_usart_tx_lock(void);
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void bsp_usart_tx_unlock(void);
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/* Called from USART1_IRQHandler (see n32wb03x_it.c) */
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void bsp_usart_rx_isr_handler(void);
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#ifdef __cplusplus
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}
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#endif
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#endif /* __BSP_USART_H__ */
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