Interfacing SX1262 LoRa module using SPI DMA

[Shaktimayee]

Hi everyone,
I am using STM32F103c8t6 module for transmitting and receiving data in between two SX1262 LoRa module. 
The libraries are found in https://github.com/Lora-net/sx126x_driver/tree/v2.3.2 link and i have successfully transmit and receive data using normal SPI communication but i want to transmit and receive the data using SPI DMA mode but i am unable to do that.
If anyone know about this please guide me regarding this. 

Thank you in advance!!

[Andrew Neil]

The SX1262 neither knows nor cares how the SPI lines get driven - it just requires that they are correct.

So put an analyser on the lines, and compare what happens in your working non-DMA case against your non-working DMA case.

Are you using the exact same hardware in both cases?

 

PS:

Also, have you tried the drivers direct from Semtech?

https://www.semtech.com/products/wireless-rf/lora-connect/sx1262

 

[Shaktimayee]

Thank you 
Yes, i am using blue pill at transmitter end and receiver end. Yes i am using the driver for sx1262 from semtech.
By following way i am initializing 

init_LoRa_parm();
 sx126x_reset(&LoRa);
 sx126x_init(&LoRa );
 sx126x_set_dio2_as_rf_sw_ctrl(&LoRa, true);
 sx126x_set_dio3_as_tcxo_ctrl(&LoRa, SX126X_TCXO_CTRL_1_8V, 0x00000F);
 sx126x_get_device_errors(&LoRa, &errors);
 printf("before STDBY_XOSC, Errors = 0x%X\r\n", errors);
 sx126x_set_standby(&LoRa, SX126X_STANDBY_CFG_XOSC);
 sx126x_clear_device_errors( &LoRa);
 sx126x_get_device_errors(&LoRa, &errors);
 printf("After STDBY_XOSC, Errors = 0x%X\r\n", errors);
 Radio_init(&LoRa);
 sx126x_clear_irq_status( &LoRa, SX126X_IRQ_ALL );
 sx126x_set_dio_irq_params(
 		 &LoRa, SX126X_IRQ_ALL,
 SX126X_IRQ_TX_DONE | SX126X_IRQ_RX_DONE,
 SX126X_IRQ_NONE, SX126X_IRQ_NONE );

 sx126x_clear_irq_status( &LoRa, SX126X_IRQ_ALL );

and in main loop i am putting the following function

void on_tx_data(void)
{
 sx126x_status_t status;

 // Prepare data
 for (int i = 0; i < 8; i++) {
 tx_buf[i] = counter++;
 }

 // Write buffer with error checking
 status = sx126x_write_buffer(&LoRa, 0, (const uint8_t*)tx_buf, 8);
 if (status != SX126X_STATUS_OK) {
 printf("Write buffer failed: %d\n", status);
 return;
 }

 // Set TX mode with error checking
 status = sx126x_set_tx(&LoRa, 0);
 if (status != SX126X_STATUS_OK) {
 printf("Set TX failed: %d\n", status);
 return;
 }

 // Print transmitted data
 printf("Sent: ");
 for (int i = 0; i < 8; i++) {
 printf("%d ", tx_buf[i]);
 }
 printf("\r\n");
}

where tx_buf is the global variable.
and 

void init_LoRa_parm(void)
{
	txdata[0] = 'M';
	txdata[1] = 'L';
	txdata[2] = 'o';
	txdata[3] = 'R';
	txdata[4] = 'a';

	LoRa.BUSY_port = BUSY_GPIO_Port;
	LoRa.BUSY_pin = BUSY_Pin;
	LoRa.NSS_port = NSS_GPIO_Port;
	LoRa.NSS_pin = NSS_Pin;
	LoRa.RST_port = RST_GPIO_Port;
	LoRa.RST_pin = RST_Pin;
	LoRa.DIO1_port = DIO1_GPIO_Port;
	LoRa.DIO1_pin = DIO1_Pin;

	LoRa.hSPIx = &hspi1;
}

this is the initialization value.
By taking this guide me to transmit the data over SPI DMA mode.

[Peter BENSCH]

@Shaktimayee

And since you're talking about an "STM32F103c8t6 module", I assume it's a Blue Pill?

If so, hardly anyone will be able to help you, as Asian clones have been used there for years. You would be doing yourself a favour to use one of the original, genuine NUCLEO boards instead, for which there is unrestricted support.

Regards
/Peter

[Shaktimayee]

At least the SPI DMA transmission and reception operation will work on bluepill as the normal transmit and receive operation is occuring frequently.

[Andrew Neil]

---

@Shaktimayee wrote:

At least the SPI DMA transmission and reception operation will work on bluepill as the normal transmit and receive operation is occuring frequently.

---

Not sure what you mean by that?

It might be the clone's DMA which is the problem ...

 

Again, have you used a scope and/or analyser to see what's actually happening on the SPI wires?

 

PS:

Have you tried with a genuine STM32?