[其它应用] 中颖SH32F9B00 DMA 应用案例

#include<<SH32F9B00.H>

void UART1_Config(void)

{

    GPIOB_CFG->LCKR.V32 = 0x5AA50000; // PB0~PB15 unlock （only CFG）

    GPIOB_CFG->AFRH.BIT.AFR9 = 7; // PB9 = AF7 ~ RXD1

    GPIOB_CFG->AFRH.BIT.AFR8 = 7; // PB8 = AF7 ~ TXD1

    GPIOB_CFG->OTYPER &= ~(0<<8);

    GPIOB_CFG->OTYPER |= 0<<8; // 0~ PB8 output PP

    GPIOB_CFG->ODRVR.BIT.ODRVR8= 0; // 00~PB8 output driver normal

    GPIOB_CFG->PUPDR.BIT.PUPDR9 = 0; // 00~PB9 input no pull

    UART1->BRT.BIT.SBRT = 194; // 9.6KBpas, 30000/16/9.6=195.3125 

    UART1->BRT.BIT.BFINE = 5; // SBRT = 195-1=194, fine=0.3125*16=5

    UART1->CR.BIT.SM = 1; // type 1: 8/1/1/none, variable baud rate

    UART1->CR.BIT.SBRTEN = 1; // enable baud rate generation

    UART1->CR.BIT.TEN = 1; // enable txd

    UART1->CR.BIT.REN = 1; // enable rxd

}









void main(void)

{

    RCC_Config(); // 配置使用 PLL 作为系统时钟，HCLK=120MHz，PCLK0=HCLK/4

    NVIC_Config(); // 如果需要配置中断，此例未用到中断

    GPIO_Config(); // 如果需要配置 I/O，此例保持默认输入悬空

    UART1_Config(); // UART1 配置为 9.6KBps， PCLK1=30MHz

    RCC->RCCLOCK = 0x33CC; // unlock RCC config

    APB0_CFG->RCCLOCK = 0x33CC; // unlock APB0_CFG config

    RCC->AHBENR.BIT.DMAEN = 1; // DMA clock enable

    RCC->AHBENR.BIT.GPIOEN = 1; // GPIO clock enable

    APB0_CFG ->APB0ENR.BIT.UART1EN = 1; // UART1 clock enable

    APB0_CFG ->RCCLOCK = 0x0; // lock APB0_CFG config

    RCC->RCCLOCK = 0x0; // lock RCC config

    UART1->CR.BIT.DMAT = 1; // 使能 UART1 的 DMA 触发功能

    DMA->SAR2 = Addr1_Sram_Data; // SRAM buffer address

    DMA->DAR2 = Addr1_Uart1_TDR; // UART1 TDR address

    DMA->NPKT2 = 255; // 256 bursts

    DMA->CCR2.BIT.TRGMODE = 0; // one-shot

    DMA->CCR2.BIT.SPTYP = 0; // point modify, 00~inc, 01~dec, 10~fix, 11~round

    DMA->CCR2.BIT.DPTYP = 2; // point modify, 00~inc, 01~dec, 10~fix, 11~round

    DMA->CCR2.BIT.EN = 1; // channel1 enable

    DMA->CSR.BIT.SWTRG = 1<<2; // SWTRG_2

    while(!((DMA->IFSR.BIT.TCIF)&(1<<2))); // wait TCIF_2 flag

    DMA->IFCR.BIT.CTCIF = 1<<2; // clear TCIF_2 flag

    while(1) // main loop

           {

           }

}