使用如下工程AT32F435_437_Firmware_Library_V2.1.2\project\at_start_f435\examples\i2c\eeprom，在默认buf大小8情况下读写正常，但是将buf修为16就出现读写错误，逻辑分析仪显示只有后8字节正常，而且数据地址也偏移了8位。请问该如何解决？MCU是F435RGT7,EEPROM为24C02，连接到PB6,PB7。
逻辑分析仪抓取的两次不同结果：
以下为mian文件，工程只修改了main文件，并将I2C1引脚为PB6,PB7，修改BUF内容，注释掉无关的中断DMA测试代码。
/**
**************************************************************************
* @file main.c
* @brief main program
**************************************************************************
* Copyright notice & Disclaimer
*
* The software Board Support Package (BSP) that is made available to
* download from Artery official website is the copyrighted work of Artery.
* Artery authorizes customers to use, copy, and distribute the BSP
* software and its related documentation for the purpose of design and
* development in conjunction with Artery microcontrollers. Use of the
* software is governed by this copyright notice and the following disclaimer.
*
* THIS SOFTWARE IS PROVIDED ON "AS IS" BASIS WITHOUT WARRANTIES,
* GUARANTEES OR REPRESENTATIONS OF ANY KIND. ARTERY EXPRESSLY DISCLAIMS,
* TO THE FULLEST EXTENT PERMITTED BY LAW, ALL EXPRESS, IMPLIED OR
* STATUTORY OR OTHER WARRANTIES, GUARANTEES OR REPRESENTATIONS,
* INCLUDING BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT.
*
**************************************************************************
*/
#include "at32f435_437_board.h"
#include "at32f435_437_clock.h"
#include "i2c_application.h"
/** @addtogroup AT32F435_periph_examples
* @{
*/
/** @addtogroup 435_I2C_eeprom I2C_eeprom
* @{
*/
#define I2C_TIMEOUT 0xFFFFFFF
//#define I2Cx_CLKCTRL 0xB170FFFF //10K
//#define I2Cx_CLKCTRL 0xC0E06969 //50K
#define I2Cx_CLKCTRL 0x80504C4E //100K
//#define I2Cx_CLKCTRL 0x30F03C6B //200K
#define I2Cx_ADDRESS 0xA0
#define I2Cx_PORT I2C1
#define I2Cx_CLK CRM_I2C1_PERIPH_CLOCK
#define I2Cx_DMA DMA1
#define I2Cx_DMA_CLK CRM_DMA1_PERIPH_CLOCK
#define I2Cx_SCL_GPIO_CLK CRM_GPIOB_PERIPH_CLOCK
#define I2Cx_SCL_GPIO_PIN GPIO_PINS_6
#define I2Cx_SCL_GPIO_PinsSource GPIO_PINS_SOURCE6
#define I2Cx_SCL_GPIO_PORT GPIOB
#define I2Cx_SCL_GPIO_MUX GPIO_MUX_4
#define I2Cx_SDA_GPIO_CLK CRM_GPIOB_PERIPH_CLOCK
#define I2Cx_SDA_GPIO_PIN GPIO_PINS_7
#define I2Cx_SDA_GPIO_PinsSource GPIO_PINS_SOURCE7
#define I2Cx_SDA_GPIO_PORT GPIOB
#define I2Cx_SDA_GPIO_MUX GPIO_MUX_4
#define I2Cx_DMA_TX_Channel DMA1_CHANNEL1
#define I2Cx_DMA_TX_DMAMUX_Channel DMA1MUX_CHANNEL1
#define I2Cx_DMA_TX_DMAREQ DMAMUX_DMAREQ_ID_I2C1_TX
#define I2Cx_DMA_TX_IRQn DMA1_Channel1_IRQn
#define I2Cx_DMA_RX_Channel DMA1_CHANNEL2
#define I2Cx_DMA_RX_DMAMUX_Channel DMA1MUX_CHANNEL2
#define I2Cx_DMA_RX_DMAREQ DMAMUX_DMAREQ_ID_I2C1_RX
#define I2Cx_DMA_RX_IRQn DMA1_Channel2_IRQn
#define I2Cx_EVT_IRQn I2C1_EVT_IRQn
#define I2Cx_ERR_IRQn I2C1_ERR_IRQn
#define BUF_SIZE 16
uint8_t tx_buf1[BUF_SIZE] = {0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08,0x55, 0x55, 0x55, 0x55, 0x55, 0x55, 0x55, 0x55};
uint8_t tx_buf2[BUF_SIZE] = {0x10, 0x20, 0x30, 0x40, 0x50, 0x60, 0x70, 0x80,0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa};
uint8_t tx_buf3[BUF_SIZE] = {0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77, 0x88};
uint8_t rx_buf1[BUF_SIZE] = {0};
uint8_t rx_buf2[BUF_SIZE] = {0};
uint8_t rx_buf3[BUF_SIZE] = {0};
i2c_handle_type hi2cx;
/**
* @brief error handler program
* @param i2c_status
* @retval none
*/
void error_handler(uint32_t error_code)
{
while(1)
{
at32_led_toggle(LED2);
delay_ms(500);
}
}
/**
* @brief compare whether the valus of buffer 1 and buffer 2 are equal.
* @param buffer1: buffer 1 address.
buffer2: buffer 2 address.
* @retval 0: equal.
* 1: unequal.
*/
uint32_t buffer_compare(uint8_t* buffer1, uint8_t* buffer2, uint32_t len)
{
uint32_t i;
for(i = 0; i < len; i++)
{
if(buffer1 != buffer2)
{
return 1;
}
}
return 0;
}
/**
* @brief main function.
* @param none
* @retval none
*/
int main(void)
{
i2c_status_type i2c_status;
/* initial system clock */
system_clock_config();
/* config nvic priority group */
nvic_priority_group_config(NVIC_PRIORITY_GROUP_4);
/* at board initial */
at32_board_init();
hi2cx.i2cx = I2Cx_PORT;
/* i2c config */
i2c_config(&hi2cx);
/* write data to memory device此处读写8字节正常，读写超过8字节就异常 */
if((i2c_status = i2c_memory_write(&hi2cx, I2C_MEM_ADDR_WIDIH_8, I2Cx_ADDRESS, 0x30, tx_buf1, 16, I2C_TIMEOUT)) != I2C_OK)
{
error_handler(i2c_status);
}
delay_ms(5);
/* read data from memory device */
if((i2c_status = i2c_memory_read(&hi2cx, I2C_MEM_ADDR_WIDIH_8, I2Cx_ADDRESS, 0x30, rx_buf1, 16, I2C_TIMEOUT)) != I2C_OK)
{
error_handler(i2c_status);
}
while(1)
{
/* wait for key USER_BUTTON press before starting the communication */
// while(at32_button_press() != USER_BUTTON)
// {
// }
// /* write data to memory device */
// if((i2c_status = i2c_memory_write_int(&hi2cx, I2C_MEM_ADDR_WIDIH_8, I2Cx_ADDRESS, 0x00, tx_buf2, BUF_SIZE, I2C_TIMEOUT)) != I2C_OK)
// {
// error_handler(i2c_status);
// }
// /* wait for the communication to end */
// if(i2c_wait_end(&hi2cx, I2C_TIMEOUT) != I2C_OK)
// {
// error_handler(i2c_status);
// }
// delay_ms(5);
// /* read data from memory device */
// if((i2c_status = i2c_memory_read_int(&hi2cx, I2C_MEM_ADDR_WIDIH_8, I2Cx_ADDRESS, 0x00, rx_buf2, BUF_SIZE, I2C_TIMEOUT)) != I2C_OK)
// {
// error_handler(i2c_status);
// }
// /* wait for the communication to end */
// if(i2c_wait_end(&hi2cx, I2C_TIMEOUT) != I2C_OK)
// {
// error_handler(i2c_status);
// }
// /* write data to memory device */
// if((i2c_status = i2c_memory_write_dma(&hi2cx, I2C_MEM_ADDR_WIDIH_8, I2Cx_ADDRESS, 0x00, tx_buf3, BUF_SIZE, I2C_TIMEOUT)) != I2C_OK)
// {
// error_handler(i2c_status);
// }
// /* wait for the communication to end */
// if(i2c_wait_end(&hi2cx, I2C_TIMEOUT) != I2C_OK)
// {
// error_handler(i2c_status);
// }
// delay_ms(5);
// /* read data from memory device */
// if((i2c_status = i2c_memory_read_dma(&hi2cx, I2C_MEM_ADDR_WIDIH_8, I2Cx_ADDRESS, 0x00, rx_buf3, BUF_SIZE, I2C_TIMEOUT)) != I2C_OK)
// {
// error_handler(i2c_status);
// }
// /* wait for the communication to end */
// if(i2c_wait_end(&hi2cx, I2C_TIMEOUT) != I2C_OK)
// {
// error_handler(i2c_status);
// }
// if((buffer_compare(tx_buf1, rx_buf1, BUF_SIZE) == 0) &&
// (buffer_compare(tx_buf2, rx_buf2, BUF_SIZE) == 0) &&
// (buffer_compare(tx_buf3, rx_buf3, BUF_SIZE) == 0))
// {
// at32_led_on(LED3);
// }
// else
// {
// error_handler(i2c_status);
// }
}
}
/**
* @brief initializes peripherals used by the i2c.
* @param none
* @retval none
*/
void i2c_lowlevel_init(i2c_handle_type* hi2c)
{
gpio_init_type gpio_init_structure;
if(hi2c->i2cx == I2Cx_PORT)
{
/* i2c periph clock enable */
crm_periph_clock_enable(I2Cx_CLK, TRUE);
crm_periph_clock_enable(I2Cx_SCL_GPIO_CLK, TRUE);
crm_periph_clock_enable(I2Cx_SDA_GPIO_CLK, TRUE);
/* gpio configuration */
gpio_pin_mux_config(I2Cx_SCL_GPIO_PORT, I2Cx_SCL_GPIO_PinsSource, I2Cx_SCL_GPIO_MUX);
gpio_pin_mux_config(I2Cx_SDA_GPIO_PORT, I2Cx_SDA_GPIO_PinsSource, I2Cx_SDA_GPIO_MUX);
/* configure i2c pins: scl */
gpio_init_structure.gpio_drive_strength = GPIO_DRIVE_STRENGTH_STRONGER;
gpio_init_structure.gpio_mode = GPIO_MODE_MUX;
gpio_init_structure.gpio_out_type = GPIO_OUTPUT_OPEN_DRAIN;
gpio_init_structure.gpio_pull = GPIO_PULL_UP;
gpio_init_structure.gpio_pins = I2Cx_SCL_GPIO_PIN;
gpio_init(I2Cx_SCL_GPIO_PORT, &gpio_init_structure);
/* configure i2c pins: sda */
gpio_init_structure.gpio_pins = I2Cx_SDA_GPIO_PIN;
gpio_init(I2Cx_SDA_GPIO_PORT, &gpio_init_structure);
/* configure and enable i2c interrupt */
nvic_irq_enable(I2Cx_EVT_IRQn, 0, 0);
nvic_irq_enable(I2Cx_ERR_IRQn, 0, 0);
/* configure and enable i2c dma channel interrupt */
nvic_irq_enable(I2Cx_DMA_TX_IRQn, 0, 0);
nvic_irq_enable(I2Cx_DMA_RX_IRQn, 0, 0);
/* i2c dma tx and rx channels configuration */
/* enable the dma clock */
crm_periph_clock_enable(I2Cx_DMA_CLK, TRUE);
/* i2c dma channel configuration */
dma_reset(hi2c->dma_tx_channel);
dma_reset(hi2c->dma_rx_channel);
hi2c->dma_tx_channel = I2Cx_DMA_TX_Channel;
hi2c->dma_rx_channel = I2Cx_DMA_RX_Channel;
hi2c->dma_init_struct.peripheral_base_addr = (uint32_t)&hi2c->i2cx->txdt;
hi2c->dma_init_struct.memory_base_addr = 0;
hi2c->dma_init_struct.direction = DMA_DIR_MEMORY_TO_PERIPHERAL;
hi2c->dma_init_struct.buffer_size = 0xFFFF;
hi2c->dma_init_struct.peripheral_inc_enable = FALSE;
hi2c->dma_init_struct.memory_inc_enable = TRUE;
hi2c->dma_init_struct.peripheral_data_width = DMA_PERIPHERAL_DATA_WIDTH_BYTE;
hi2c->dma_init_struct.memory_data_width = DMA_MEMORY_DATA_WIDTH_BYTE;
hi2c->dma_init_struct.loop_mode_enable = FALSE;
hi2c->dma_init_struct.priority = DMA_PRIORITY_LOW;
dma_init(hi2c->dma_tx_channel, &hi2c->dma_init_struct);
dma_init(hi2c->dma_rx_channel, &hi2c->dma_init_struct);
dmamux_init(I2Cx_DMA_TX_DMAMUX_Channel, I2Cx_DMA_TX_DMAREQ);
dmamux_init(I2Cx_DMA_RX_DMAMUX_Channel, I2Cx_DMA_RX_DMAREQ);
dmamux_enable(I2Cx_DMA, TRUE);
/* config i2c */
i2c_init(hi2c->i2cx, 0x0F, I2Cx_CLKCTRL);
i2c_own_address1_set(hi2c->i2cx, I2C_ADDRESS_MODE_7BIT, I2Cx_ADDRESS);
}
}
/**
* @}
*/
/**
* @}
*/
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