以下以STM32为例,使用HAL库进行SPI通信。
1.初始化SPI:
SPI_HandleTypeDef hspi1;
void MX_SPI1_Init(void)
{
hspi1.Instance = SPI1;
hspi1.Init.Mode = SPI_MODE_MASTER;
hspi1.Init.Direction = SPI_DIRECTION_2LINES;
hspi1.Init.DataSize = SPI_DATASIZE_8BIT;
hspi1.Init.CLKPolarity = SPI_POLARITY_LOW;
hspi1.Init.CLKPhase = SPI_PHASE_1EDGE;
hspi1.Init.NSS = SPI_NSS_SOFT;
hspi1.Init.BaudRatePrescaler = SPI_BAUDRATEPRESCALER_32;
hspi1.Init.FirstBit = SPI_FIRSTBIT_MSB;
hspi1.Init.TIMode = SPI_TIMODE_DISABLE;
hspi1.Init.CRCCalculation = SPI_CRCCALCULATION_DISABLE;
hspi1.Init.CRCPolynomial = 10;
HAL_SPI_Init(&hspi1);
}
2.SDNAND初始化函数:
#define CS_LOW() HAL_GPIO_WritePin(GPIOA, GPIO_PIN_4, GPIO_PIN_RESET) // 片选引脚
#define CS_HIGH() HAL_GPIO_WritePin(GPIOA, GPIO_PIN_4, GPIO_PIN_SET)
void TFCard_Init(void)
{
CS_HIGH();
HAL_Delay(1);
CS_LOW();
HAL_SPI_Transmit(&hspi1, &dummy_byte, 1, HAL_MAX_DELAY);
// 发送初始化命令
// 继续发送更多命令,设置TF卡状态
CS_HIGH();
}
3.读写SDNAND数据函数:
void TFCard_ReadBlock(uint32_t blockAddr, uint8_t *buffer)
{
CS_LOW();
// 发送读命令
// 发送块地址
HAL_SPI_Transmit(&hspi1, command, commandLength, HAL_MAX_DELAY);
// 等待数据
HAL_SPI_Receive(&hspi1, buffer, 512, HAL_MAX_DELAY); // 假设块大小为512字节
CS_HIGH();
}
void TFCard_WriteBlock(uint32_t blockAddr, uint8_t *data)
{
CS_LOW();
// 发送写命令
// 发送块地址
HAL_SPI_Transmit(&hspi1, command, commandLength, HAL_MAX_DELAY);
HAL_SPI_Transmit(&hspi1, data, 512, HAL_MAX_DELAY);
CS_HIGH();
}
如果您有任何特定的硬件或软件问题,欢迎随时询问!
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