I2C — I2C 主发从收 DMA

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#include "gd32f30x.h"
#include <stdio.h>
#include "gd32f307c_eval.h"
#define I2C0_SLAVE_ADDRESS7      0x82
#define I2C1_SLAVE_ADDRESS7      0x72
#define ARRAYNUM(arr_nanme)      (uint32_t)(sizeof(arr_nanme) / sizeof(*(arr_nanme)))
#define I2C0_DATA_ADDRESS        0x40005410
#define I2C1_DATA_ADDRESS        0x40005810
#define BUFFER_SIZE              (ARRAYNUM(i2c0_buff_tx)-1)

void rcu_config(void);
void gpio_config(void);
void i2c_config(void);
ErrStatus memory_compare(uint8_t *src, uint8_t *dst, uint16_t length);

/*!
    \brief      main function
    \param[in]  none
    \param[out] none
    \retval     none
*/
int main(void)
{
    dma_parameter_struct dma_init_struct;

    gd_eval_led_init(LED2);
    gd_eval_led_init(LED3);
    rcu_config();
    gpio_config();
    i2c_config();

    /* initialize DMA channel4 */
    dma_deinit(DMA0, DMA_CH4);
    dma_struct_para_init(&dma_init_struct);

    dma_init_struct.direction = DMA_PERIPHERAL_TO_MEMORY;
    dma_init_struct.memory_addr = (uint32_t)i2c1_buff_rx;
    dma_init_struct.memory_inc = DMA_MEMORY_INCREASE_ENABLE;
    dma_init_struct.memory_width = DMA_MEMORY_WIDTH_8BIT;
    dma_init_struct.number = BUFFER_SIZE;
    dma_init_struct.periph_addr = I2C1_DATA_ADDRESS;
    dma_init_struct.periph_inc = DMA_PERIPH_INCREASE_DISABLE;
    dma_init_struct.periph_width = DMA_PERIPHERAL_WIDTH_8BIT;
    dma_init_struct.priority = DMA_PRIORITY_ULTRA_HIGH;
    dma_init(DMA0, DMA_CH4, &dma_init_struct);

    /* initialize DMA channel5 */
    dma_deinit(DMA0, DMA_CH5);
    dma_init_struct.direction = DMA_MEMORY_TO_PERIPHERAL;
    dma_init_struct.memory_addr = (uint32_t)i2c0_buff_tx;
    dma_init_struct.periph_addr = I2C0_DATA_ADDRESS;
    dma_init_struct.priority = DMA_PRIORITY_HIGH;
    dma_init(DMA0, DMA_CH5, &dma_init_struct);

    /* wait until I2C bus is idle */
    while(i2c_flag_get(I2C0, I2C_FLAG_I2CBSY));

    /* send a start condition to I2C bus */
    i2c_start_on_bus(I2C0);

    /* wait until SBSEND bit is set */
    while(!i2c_flag_get(I2C0, I2C_FLAG_SBSEND));

    /* send slave address to I2C bus*/
    i2c_master_addressing(I2C0, I2C1_SLAVE_ADDRESS7, I2C_TRANSMITTER);

    /* wait until ADDSEND bit is set*/
    while(!i2c_flag_get(I2C1, I2C_FLAG_ADDSEND));
    while(!i2c_flag_get(I2C0, I2C_FLAG_ADDSEND));
    /* clear ADDSEND bit */
    i2c_flag_clear(I2C0, I2C_FLAG_ADDSEND);
    i2c_flag_clear(I2C1, I2C_FLAG_ADDSEND);

    /* enable I2C1 DMA */
    i2c_dma_config(I2C1, I2C_DMA_ON);
    /* enable I2C0 DMA */
    i2c_dma_config(I2C0, I2C_DMA_ON);
    /* enable DMA0 channel4 */
    dma_channel_enable(DMA0, DMA_CH4);
    /* enable DMA0 channel5 */
    dma_channel_enable(DMA0, DMA_CH5);

    /* DMA0 channel4 full transfer finish flag */
    while(!dma_flag_get(DMA0, DMA_CH4, DMA_FLAG_FTF));
    /* DMA0 channel5 full transfer finish flag */
    while(!dma_flag_get(DMA0, DMA_CH5, DMA_FLAG_FTF));

    /* send a stop condition to I2C bus*/
    i2c_stop_on_bus(I2C0);
    /* wait until stop condition generate */
    while(I2C_CTL0(I2C0) & 0x0200);
    while(!i2c_flag_get(I2C1, I2C_FLAG_STPDET));
    /* clear the STPDET bit */
    i2c_enable(I2C1);
    state = memory_compare(i2c0_buff_tx, i2c1_buff_rx, BUFFER_SIZE);
    if(SUCCESS == state) {
        gd_eval_led_on(LED2);
        gd_eval_led_on(LED3);
    } else {
        gd_eval_led_off(LED2);
        gd_eval_led_off(LED3);
    }
    while(1) {
    }
}

void rcu_config(void)
{
    /* enable GPIOB clock */
    rcu_periph_clock_enable(RCU_GPIOB);
    /* enable I2C1 clock */
    rcu_periph_clock_enable(RCU_I2C1);
    /* enable I2C0 clock */
    rcu_periph_clock_enable(RCU_I2C0);
    /* enable DMA0 clock */
    rcu_periph_clock_enable(RCU_DMA0);
}

void gpio_config(void)
{
    /* connect PB6 to I2C0_SCL */
    /* connect PB7 to I2C0_SDA */
    /* connect PB10 to I2C1_SCL */
    /* connect PB11 to I2C1_SDA */
    gpio_init(GPIOB, GPIO_MODE_AF_OD, GPIO_OSPEED_50MHZ, GPIO_PIN_6 | GPIO_PIN_7 | GPIO_PIN_10 | GPIO_PIN_11);
}

void i2c_config(void)
{
    /* configure I2C0 clock */
    i2c_clock_config(I2C0, 100000, I2C_DTCY_2);
    /* configure I2C0 address */
    i2c_mode_addr_config(I2C0, I2C_I2CMODE_ENABLE, I2C_ADDFORMAT_7BITS, I2C0_SLAVE_ADDRESS7);
    /* enable I2C0 */
    i2c_enable(I2C0);
    /* enable acknowledge */
    i2c_ack_config(I2C0, I2C_ACK_ENABLE);
    /* configure I2C1 clock */
    i2c_clock_config(I2C1, 100000, I2C_DTCY_2);
    /* configure I2C1 address */
    i2c_mode_addr_config(I2C1, I2C_I2CMODE_ENABLE, I2C_ADDFORMAT_7BITS, I2C1_SLAVE_ADDRESS7);
    /* enable I2C1 */
    i2c_enable(I2C1);
    /* enable acknowledge */
    i2c_ack_config(I2C1, I2C_ACK_ENABLE);
}