瑞萨RX62N使用DMA+SCI传输问题
我在使用瑞萨RX62N单片机，有瑞萨官方提供的RPDL驱动，实现通过DMA接收SCI的数据，但是SCI发送不通过DMA，结果我的发送串口收不到。代码如下：
/* PDL functions and definitions */
#include "r_pdl_dmac.h"
#include "r_pdl_cgc.h"
#include "r_pdl_intc.h"
#include "r_pdl_sci.h"
/* RPDL device-specific definitions */
#include "r_pdl_definitions.h"
/* Callback function prototype */
void DMAC2_transfer_end_handler(void);
void main(void);
/* Data destination area */
volatile uint8_t destination_string_1={0};
void main(void)
{
unsigned char i;
/* Initialise the system clocks */
R_CGC_Set(
8E6,
64E6,
32E6,
PDL_NO_DATA,
PDL_CGC_BCLK_DISABLE
);
/* Set the CPU’s Interrupt Priority Level to 0 */
R_INTC_Write(
PDL_INTC_REG_IPL,
0
);
/* Configure the RS232 port */
R_SCI_Create(
2,
PDL_SCI_ASYNC |PDL_SCI_TX_CONNECTED | PDL_SCI_RX_CONNECTED | PDL_SCI_8_BIT_LENGTH | PDL_SCI_PARITY_NONE | PDL_SCI_STOP_1,
115200,
7
);
/* Configure channel 2 */
R_DMAC_Create(
2,
PDL_DMAC_NORMAL | PDL_DMAC_SOURCE_ADDRESS_FIXED| \
PDL_DMAC_DESTINATION_ADDRESS_PLUS| PDL_DMAC_SIZE_8 | PDL_DMAC_IRQ_END | PDL_DMAC_TRIGGER_CLEAR,
PDL_DMAC_TRIGGER_SCI2_RX,
(uint8_t *)&SCI2.RDR,
destination_string_1,
32,
PDL_NO_DATA,
PDL_NO_DATA,
PDL_NO_DATA,
PDL_NO_DATA,
DMAC2_transfer_end_handler,
0
);
/* Enable channel 2 */
R_DMAC_Control(
2,
PDL_DMAC_ENABLE,
PDL_NO_PTR,
PDL_NO_PTR,
PDL_NO_DATA,
PDL_NO_DATA,
PDL_NO_DATA,
PDL_NO_DATA,
PDL_NO_DATA
);
/* Initiate reception, triggering the DMAC when data is received */
R_SCI_Receive(
2,
PDL_SCI_DMAC_TRIGGER_ENABLE,
PDL_NO_PTR,
PDL_NO_DATA,
PDL_NO_FUNC,
PDL_NO_FUNC
);
R_SCI_Send(
2,
PDL_NO_DATA,
"SEND",
0,
PDL_NO_FUNC
);
}
void DMAC2_transfer_end_handler(void)
{
/* Disable channel 2 */
R_DMAC_Control(
2,
PDL_DMAC_SUSPEND,
PDL_NO_PTR,
PDL_NO_PTR,
PDL_NO_DATA,
PDL_NO_DATA,
PDL_NO_DATA,
PDL_NO_DATA,
PDL_NO_DATA
);
} DMA 这玩意很难，一直搞不清楚。
关注中 串口DMA收发已经实现了。但是我想使用DMA接收串口数据存入循环队列里，不知道如何实现。
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