[英]interfacing ssd1306 with stm32f103 on registers, i2c 'data mode' not working
[英]I can't get data with I2C from mpu6050 on STM32F103
我是新的 I2C 通信。 我检查了一些正在运行的代码。 我用过他们用过的功能。 但是我无法获得任何数据。 我想知道I2C是否必须做初始配置? 问题出在哪儿。 这是我写的函数:
void GetI2CAccelerometer(uint8_t slaveAddress,uint8_t accelData[6])
{
// slaveAddress=0x68 (default address is written in datasheet)
HAL_I2C_Master_Transmit(&hi2c1,slaveAddress<<1,1,0x3B,1,200);
HAL_I2C_Master_Receive(&hi2c1,slaveAddress<<1,accelData,6,200);
HAL_I2C_Mem_Read(&hi2c1,(slaveAddress<<1)+1,0x3B,1,accelData,1,200);
// i tried this function too but not working
}
我用 CubeMX 创建了这个项目。 这是初始 I2C 配置,并且 GPIO_A 时钟线在另一个我没有写的函数中被激活:
static void MX_I2C1_Init(void)
{
hi2c1.Instance = I2C1;
hi2c1.Init.ClockSpeed = 100000;
hi2c1.Init.DutyCycle = I2C_DUTYCYCLE_2;
hi2c1.Init.OwnAddress1 = 208;
hi2c1.Init.AddressingMode = I2C_ADDRESSINGMODE_7BIT;
hi2c1.Init.DualAddressMode = I2C_DUALADDRESS_DISABLE;
hi2c1.Init.OwnAddress2 = 0;
hi2c1.Init.GeneralCallMode = I2C_GENERALCALL_DISABLE;
hi2c1.Init.NoStretchMode = I2C_NOSTRETCH_DISABLE;
if (HAL_I2C_Init(&hi2c1) != HAL_OK)
{
Error_Handler();
}
}
首先,最好使用DMA或IT数据交换。 轮询不好,但可以用于测试。
您必须放置指向数据的指针,而不是数据本身。 好的做法是这样的:
void GetI2CAccelerometer(I2C_HandleTypeDef * hi2c, uint8_t slaveAddress, uint8_t * accelData, size_t size) {
uint8_t request = 0x3B;
// slaveAddress=0x68 (default address is written in datasheet)
// HAL_I2C_Master_Transmit(I2C_HandleTypeDef *hi2c, uint16_t DevAddress, uint8_t *pData, uint16_t Size, uint32_t Timeout)
while (HAL_I2C_Master_Transmit(hi2c, slaveAddress << 1, (uint8_t*)request, 1, 200) != HAL_OK) {
// Use FreeRTOS vTaskDelay(1) and/or check errors here
// And check timeout or you will hang over here
}
//HAL_I2C_Master_Receive(I2C_HandleTypeDef *hi2c, uint16_t DevAddress, uint8_t *pData, uint16_t Size, uint32_t Timeout)
while (HAL_I2C_Master_Receive(hi2c, slaveAddress << 1, accelData, size, 200) != HAL_OK) {
// Use FreeRTOS vTaskDelay(1) and/or check errors here
// And check timeout or you will hang over here
}
while (HAL_I2C_GetState(hi2c) != HAL_I2C_STATE_READY) {
// Use FreeRTOS vTaskDelay(1) and/or check errors here
// And check timeout or you will hang over here
}
}
然后通过函数请求数据:
uint8_t accelData[6];
GetI2CAccelerometer(&hi2c1, 0x68, accelData, 6);
这对测试没问题,但对生产不利。 获取数据,然后重写以使用 I2C DMA 或 IT。 检查 I2C 总线上的错误并进行一些枚举以从函数返回错误/状态。
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