SPI Master Receive Data
Posted: Fri Oct 20, 2017 6:49 pm
Hello,
I am having some troubles extracting data from the receive buffer using spi_device_get_trans_result. I can see the response from the slave so I know that i am getting the correct response. I am wondering if someone can share an example of how to do this. Here is my test main from the spi master example:
I am having some troubles extracting data from the receive buffer using spi_device_get_trans_result. I can see the response from the slave so I know that i am getting the correct response. I am wondering if someone can share an example of how to do this. Here is my test main from the spi master example:
Code: Select all
void app_main()
{
spi_transaction_t *rtrans;
uint8_t data[2];
uint8_t data1;
esp_err_t ret;
spi_device_handle_t spi;
spi_bus_config_t buscfg={
.miso_io_num=PIN_NUM_MISO,
.mosi_io_num=PIN_NUM_MOSI,
.sclk_io_num=PIN_NUM_CLK,
.quadwp_io_num=-1,
.quadhd_io_num=-1
};
spi_device_interface_config_t devcfg={
.clock_speed_hz=10000000, //Clock out at 10 MHz
.mode=0, //SPI mode 0
.spics_io_num=PIN_NUM_CS, //CS pin
.queue_size=1, //We want to be able to queue 7 transactions at a time
.pre_cb=ili_spi_pre_transfer_callback, //Specify pre-transfer callback to handle D/C line
};
//Initialize the SPI bus
ret=spi_bus_initialize(HSPI_HOST, &buscfg, 1);
assert(ret==ESP_OK);
//Attach the device to the SPI bus
ret=spi_bus_add_device(HSPI_HOST, &devcfg, &spi);
assert(ret==ESP_OK);
data[0] = 0x8f;
data[1] = 0x00;
printf("1\n");
rtrans.flags=SPI_TRANS_USE_RXDATA;
ili_data(spi, data, 2);
spi_device_get_trans_result(spi, rtrans, 10);
printf("%x\n",rtrans.rx_data[0]);
printf("%x\n",rtrans.rx_data[1]);
printf("%x\n",rtrans.rx_data[2]);
printf("%x\n",rtrans.rx_data[3]);
while(1)
{
ili_data(spi, data, 2);
vTaskDelay(1000 / portTICK_RATE_MS);
}
}