uint16_t spi_send_uint8_receive_13bits(uint8_t to_send)
{
spi_prepare_txrx_bits(8, 13);
*spi_fifo = to_send;
spi_start_tx();
spi_wait_ready();
return (*spi_fifo) & 0x1FFF;
}
void spi_send_data(const uint8_t * data, uint8_t datasize)
{
uint32_t *_data = (uint32_t*)data;
uint8_t i;
uint8_t words_to_send = __min((datasize + 3) / 4, SPIFIFOSIZE);
spi_prepare_tx(datasize);
for(i = 0; i < words_to_send;i++)
spi_fifo[i] = _data[i];
spi_start_tx();
}
void spi_send_uint16_r(uint16_t data, int32_t repeats)
{
uint32_t i;
uint32_t word = data << 16 | data;
while(repeats > 0)
{
uint16_t bytes_to_transfer = __min(repeats * sizeof(uint16_t) , SPIFIFOSIZE * sizeof(uint32_t));
spi_wait_ready();
spi_prepare_tx(bytes_to_transfer);
for(i = 0; i < (bytes_to_transfer + 3) / 4;i++)
spi_fifo[i] = word;
spi_start_tx();
repeats -= bytes_to_transfer / 2;
}
}
uint8_t sd_cmd0()
{
int i, r;
spi_start_tx(sd_spi);
for(i = 0; i < 10; i++)
spi_rxtx(sd_spi, 0xFF);
spi_rxtx(sd_spi, 0x40);
spi_rxtx(sd_spi, 0x00);
spi_rxtx(sd_spi, 0x00);
spi_rxtx(sd_spi, 0x00);
spi_rxtx(sd_spi, 0x95);
//Polling it to check response to 0x01
r = 0xFF;
for(int i = 0; i < 1000 && r != 0xFF; i++)
r = spi_rxtx(sd_spi, 0xFF);
return r;
}