I need to use SPI without DMA for some purposes. But when I turn it off for SPI, LCD s

I rewrote transfer function to this and fixed it. <div class="highlight highlight-

Turn DMA off about esp-idf-ili9340 HOT 3 CLOSED

nopnop2002 commented on June 5, 2024

Turn DMA off

from esp-idf-ili9340.

Comments (3)

nopnop2002 commented on June 5, 2024

I don't know how to use SPI without DMA.

You can probably find out by asking here.

https://github.com/espressif/esp-idf/issues

from esp-idf-ili9340.

AliMoal commented on June 5, 2024

I guess, it is because we cannot use SPI without DMA for transferring more than 64 Bytes in one session according to the docs.
I'll change it and figure out how to fix this.

from esp-idf-ili9340.

AliMoal commented on June 5, 2024

I rewrote transfer function to this and fixed it.

bool spi_master_write_byte(spi_device_handle_t SPIHandle, const uint8_t* Data, size_t DataLength)
{
	spi_transaction_t SPITransaction;
	esp_err_t ret;

// 	if ( DataLength > 0 ) {
// 		memset( &SPITransaction, 0, sizeof( spi_transaction_t ) );
// 		SPITransaction.length = DataLength * 8;
// 		SPITransaction.tx_buffer = Data;
// #if 1
// 		ret = spi_device_transmit( SPIHandle, &SPITransaction );
// #endif
// #if 0
// 		ret = spi_device_polling_transmit( SPIHandle, &SPITransaction );
// #endif
// 		assert(ret==ESP_OK); 
// 	}

	if ( DataLength > 0 ) {
		memset( &SPITransaction, 0, sizeof( spi_transaction_t ) );
		uint32_t Count = 0;
		for (; DataLength / SOC_SPI_MAXIMUM_BUFFER_SIZE != 0; Count++, DataLength -= SOC_SPI_MAXIMUM_BUFFER_SIZE)
		{
			SPITransaction.length = SOC_SPI_MAXIMUM_BUFFER_SIZE * 8;
			SPITransaction.tx_buffer = &Data[Count * SOC_SPI_MAXIMUM_BUFFER_SIZE];
			ret = spi_device_transmit( SPIHandle, &SPITransaction );
			assert(ret==ESP_OK); 
		}
		if (DataLength % SOC_SPI_MAXIMUM_BUFFER_SIZE != 0)
		{
			SPITransaction.length = (DataLength % SOC_SPI_MAXIMUM_BUFFER_SIZE) * 8;
			SPITransaction.tx_buffer = &Data[Count * SOC_SPI_MAXIMUM_BUFFER_SIZE];
			ret = spi_device_transmit( SPIHandle, &SPITransaction );
			assert(ret==ESP_OK); 
		}
	}

	return true;
}