C 用SPI向SD写入一个块,SD的奇怪响应
这是我将512字节的数据块写入SD卡的代码。代码工作正常,但当我检查一切正常时(通过SD读取响应),我读取了C 用SPI向SD写入一个块,SD的奇怪响应,c,embedded,sd-card,spi,C,Embedded,Sd Card,Spi,这是我将512字节的数据块写入SD卡的代码。代码工作正常,但当我检查一切正常时(通过SD读取响应),我读取了0xFF 该值应类似于(来自SD参考手册): 代码如下: uint8_t SdCard_SendBlock(uint32_t block, uint8_t * data) { switch (sd_write_blk_machine.fields.state) { case WRITE_START: //Enable Card GPIOC_PDOR &
0xFF
该值应类似于(来自SD参考手册):
代码如下:
uint8_t SdCard_SendBlock(uint32_t block, uint8_t * data)
{
switch (sd_write_blk_machine.fields.state)
{
case WRITE_START:
//Enable Card
GPIOC_PDOR &= ~GPIO_PDOR_PDO(GPIO_PIN(10));
sd_cmd_arg.sd_cmd_tot_argument = block << SD_BLOCK_SHIFT;
sd_write_blk_machine.fields.state = WRITE_SEND_CMD24;
/*INIZIALIZZO LE VARIABILI LOCALI*/
write_send_data_counter = 0;
sd_cmd_machine.sd_cmd_machine = 0;
break;
case WRITE_SEND_CMD24:
send_command_return = SdSendCmd(CMD24|0x40,ASPECTED_OK_RESPONSE);
if( send_command_return == SDCARD_CMD_FAILS)
{
//Disable Card
GPIOC_PDOR |= GPIO_PDOR_PDO(GPIO_PIN(10));
sd_write_blk_machine.fields.complete = 1;
system_error.flags.sdcard_error = SDCARD_WRITE_FAIL;
return(SDCARD_WRITE_FAIL);
}
sd_write_blk_machine.fields.state = WRITE_SEND_START_TOKEN;
}
break;
case WRITE_SEND_START_TOKEN:
Spi_writeData(SPI0,SD_TOK_WRITE_SBLOCK); //SD_TOK_WRITE_SBLOCK = 0xFE ,
spi_control_machine.spi_control_machine = 0;
sd_write_blk_machine.fields.state = WRITE_SEND_DATA;
break;
case WRITE_SEND_DATA:
if (write_send_data_counter < SDCARD_BLOCK_SIZE) //SDCARD_BLOCK_SIZE = 512 byte
{
Spi_writeData(SPI0, data[write_send_data_counter]);
{
spi_control_machine.spi_control_machine = 0;
write_send_data_counter++;
}
}
else
sd_write_blk_machine.fields.state = WRITE_SEND_IDLE_1;
break;
case WRITE_SEND_IDLE_1:
Spi_writeData(SPI0,0xFF); // 0xFF = SPI_IDLE
sd_write_blk_machine.fields.state = WRITE_SEND_IDLE_2;
break;
case WRITE_SEND_IDLE_2:
Spi_writeData(SPI0,0xFF); // 0xFF = SPI_IDLE
sd_write_blk_machine.fields.state = WRITE_READ_RESPONSE_TOKEN;
break;
case WRITE_READ_RESPONSE_TOKEN:
/*Every data block written to the card will be acknowledged by a data response token. It is one byte long
and has the following format:
x x x 0 Status 1
The meaning of the status bits is defined as follows:
010 - Data accepted.
101 - Data rejected due to a CRC error.
110 - Data Rejected due to a Write Error*/
spi_control_machine.spi_control_machine = 0;
Spi_readData(SPI0, &write_read_response); // HERE IS THE PROBLEM !!!! write_read_response = 0xFF
if ( (write_read_response & 0x0F) != SD_ACCEPTED_WRITE_DATA )
{
//disabilita carta
GPIOC_PDOR |= GPIO_PDOR_PDO(GPIO_PIN(10));
system_error.flags.sdcard_error = SDCARD_WRITE_FAIL;
sd_write_blk_machine.fields.complete = 1;
SendBlockReturn=0;
return (SDCARD_WRITE_FAIL);
}
sd_write_blk_machine.fields.complete = 1;
status.flags.sdwrite_wait_attemp = 1;
SendBlockReturn=1;
return (TERMINATE_OK);
break;
}
uint8\u t SD卡发送块(uint32\u t块,uint8\u t*数据)
{
开关(sd_write_blk_machine.fields.state)
{
案例写入_开始:
//启用卡
GPIOC_-PDOR&=~GPIO_-PDOR_-PDO(GPIO_引脚(10));
sd_cmd_arg.sd_cmd_tot_argument=block在完成写入之前,卡似乎正在返回0xFF。根据:
只要卡在忙编程,就会向主机发送连续的忙令牌流(有效地保持数据输出线的低位)
也就是说,我不确定为什么卡没有首先返回'010'已接受的响应-可能是卡制造商没有遵守规范
您要做的是反复调用Spi_readData,直到返回的字节变为0
或'010'已被接受
如果您查看SD规范上的图表,繁忙的令牌出现在数据响应之后,您看到的是正常的,在发送最后一个字节后,您应该继续读取数据,直到您获得data响应令牌,然后卡将开始编程,在编程完成之前,您将获得忙令牌。卡编程时,您将读取0(数据线保持低位)。在您传输最后一个字节后,我认为规范没有说明数据线的状态,我也总是得到0xFF,但您不应该指望它,所以只需继续检查响应令牌,直到您得到它。我假设卡初始化运行正常-所有返回均已检查等?是的,SD卡初始化工作正常,CMD24也工作正常…为了尝试,我制作了一个这样的数组:数组[0]=254=11111110//Start Block Token array[1-511]=要发送的随机字节,我尝试发送这个数组Spi_readData()
是如何实现的?在我看来,您忘了发送另一个伪字节。
uint8_t SdCard_SendBlock(uint32_t block, uint8_t * data)
{
switch (sd_write_blk_machine.fields.state)
{
case WRITE_START:
//Enable Card
GPIOC_PDOR &= ~GPIO_PDOR_PDO(GPIO_PIN(10));
sd_cmd_arg.sd_cmd_tot_argument = block << SD_BLOCK_SHIFT;
sd_write_blk_machine.fields.state = WRITE_SEND_CMD24;
/*INIZIALIZZO LE VARIABILI LOCALI*/
write_send_data_counter = 0;
sd_cmd_machine.sd_cmd_machine = 0;
break;
case WRITE_SEND_CMD24:
send_command_return = SdSendCmd(CMD24|0x40,ASPECTED_OK_RESPONSE);
if( send_command_return == SDCARD_CMD_FAILS)
{
//Disable Card
GPIOC_PDOR |= GPIO_PDOR_PDO(GPIO_PIN(10));
sd_write_blk_machine.fields.complete = 1;
system_error.flags.sdcard_error = SDCARD_WRITE_FAIL;
return(SDCARD_WRITE_FAIL);
}
sd_write_blk_machine.fields.state = WRITE_SEND_START_TOKEN;
}
break;
case WRITE_SEND_START_TOKEN:
Spi_writeData(SPI0,SD_TOK_WRITE_SBLOCK); //SD_TOK_WRITE_SBLOCK = 0xFE ,
spi_control_machine.spi_control_machine = 0;
sd_write_blk_machine.fields.state = WRITE_SEND_DATA;
break;
case WRITE_SEND_DATA:
if (write_send_data_counter < SDCARD_BLOCK_SIZE) //SDCARD_BLOCK_SIZE = 512 byte
{
Spi_writeData(SPI0, data[write_send_data_counter]);
{
spi_control_machine.spi_control_machine = 0;
write_send_data_counter++;
}
}
else
sd_write_blk_machine.fields.state = WRITE_SEND_IDLE_1;
break;
case WRITE_SEND_IDLE_1:
Spi_writeData(SPI0,0xFF); // 0xFF = SPI_IDLE
sd_write_blk_machine.fields.state = WRITE_SEND_IDLE_2;
break;
case WRITE_SEND_IDLE_2:
Spi_writeData(SPI0,0xFF); // 0xFF = SPI_IDLE
sd_write_blk_machine.fields.state = WRITE_READ_RESPONSE_TOKEN;
break;
case WRITE_READ_RESPONSE_TOKEN:
/*Every data block written to the card will be acknowledged by a data response token. It is one byte long
and has the following format:
x x x 0 Status 1
The meaning of the status bits is defined as follows:
010 - Data accepted.
101 - Data rejected due to a CRC error.
110 - Data Rejected due to a Write Error*/
spi_control_machine.spi_control_machine = 0;
Spi_readData(SPI0, &write_read_response); // HERE IS THE PROBLEM !!!! write_read_response = 0xFF
if ( (write_read_response & 0x0F) != SD_ACCEPTED_WRITE_DATA )
{
//disabilita carta
GPIOC_PDOR |= GPIO_PDOR_PDO(GPIO_PIN(10));
system_error.flags.sdcard_error = SDCARD_WRITE_FAIL;
sd_write_blk_machine.fields.complete = 1;
SendBlockReturn=0;
return (SDCARD_WRITE_FAIL);
}
sd_write_blk_machine.fields.complete = 1;
status.flags.sdwrite_wait_attemp = 1;
SendBlockReturn=1;
return (TERMINATE_OK);
break;
}