54 lines
1.0 KiB
C
54 lines
1.0 KiB
C
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#include "bsp_action.h"
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#include "main.h"
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extern UART_HandleTypeDef huart1;
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extern DMA_HandleTypeDef hdma_usart1_rx;
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void RS232_init(uint8_t *rx1_buf, uint8_t *rx2_buf, uint16_t dma_buf_num)
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{
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//enable the dma transfer for the receiver request
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SET_BIT(huart1.Instance->CR3, USART_CR3_DMAR);
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//enable idle interrupt
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__HAL_UART_ENABLE_IT(&huart1, UART_IT_IDLE);
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//disable dma, to change the dma register
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__HAL_DMA_DISABLE(&hdma_usart1_rx);
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//disable dma again but why?
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//what's the condition?
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while(hdma_usart1_rx.Instance->CR & DMA_SxCR_EN)
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{
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__HAL_DMA_DISABLE(&hdma_usart1_rx);
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}
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//??
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hdma_usart1_rx.Instance->PAR = (uint32_t) & (USART1->DR);
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//memory buffer 1
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hdma_usart1_rx.Instance->M0AR = (uint32_t)(rx1_buf);
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//momory buffer 2
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hdma_usart1_rx.Instance->M1AR = (uint32_t)(rx2_buf);
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//data length
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hdma_usart1_rx.Instance->NDTR = dma_buf_num;
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//enable double memory buffer
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SET_BIT(hdma_usart1_rx.Instance->CR, DMA_SxCR_DBM);
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//enable dma
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__HAL_DMA_ENABLE(&hdma_usart1_rx);
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}
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