Hi Goodix,

We use the Goodix GR5515IGND chip with SPI display. To ensure an acceptable frame rate, we must use the DMA mode. However, when I use hal_spi_transmit_dma to transmit an array of pixels, only a limited part of the display shows the information I need (less than ~4096 bytes(2k pixels) come from a 32384 buffer). It looks like HAL has restrictions on the maximum data size for transferring via DMA, and I really hope that this is not so.

When working through hal_spi_transmit (in blocking mode), the display works fine (but slowly).

Please help us! Our device is under active development and we won't be able to release the product if we don't achieve the required frame rate.

SDK: GR551x_SDK_V1.7.0

custom_config.h:

// <o> SPI DMA enable
// <0=> DISABLE
// <1=> ENABLE
#ifndef APP_DRV_SPI_DMA_ENABLE
#define APP_DRV_SPI_DMA_ENABLE              1
#endif

a bit of code:

#define DISPLAY_IO_CONFIG                   {{ APP_IO_TYPE_MSIO,   APP_IO_MUX_7, MSIO_PIN_2,    APP_IO_NOPULL, APP_SPI_PIN_ENABLE },\
                                             { APP_IO_TYPE_NORMAL, APP_IO_MUX_0, APP_IO_PIN_24, APP_IO_NOPULL, APP_SPI_PIN_ENABLE },\
                                             { APP_IO_TYPE_NORMAL, APP_IO_MUX_0, APP_IO_PIN_25, APP_IO_NOPULL, APP_SPI_PIN_ENABLE },\
                                             { APP_IO_TYPE_NORMAL, APP_IO_MUX_0, APP_IO_PIN_16, APP_IO_NOPULL, APP_SPI_PIN_ENABLE }}
#define DISPLAY_MODE_CONFIG                 { APP_SPI_TYPE_DMA, DMA_Channel0, DMA_Channel1 }
#define DISPLAY_SPI_CONFIG                  { SPI_DATASIZE_8BIT, SPI_POLARITY_LOW, SPI_PHASE_1EDGE, (SystemCoreClock / 32000000), SPI_TIMODE_DISABLE, SPI_SLAVE_SELECT_0 }
#define DISPLAY_PARAM_CONFIG                { APP_SPI_ID_MASTER, DISPLAY_IO_CONFIG, DISPLAY_MODE_CONFIG, DISPLAY_SPI_CONFIG }


 ...
 app_spi_params_t spi_params = DISPLAY_PARAM_CONFIG;
 ret = app_spi_init(&spi_params, app_spi_callback);
 
 ...
 volatile uint8_t g_master_tdone = 1;
 volatile uint8_t g_master_rdone = 1;

 void app_spi_callback(app_spi_evt_t *p_evt) {	
  if (p_evt->type == APP_SPI_EVT_TX_CPLT) {
		g_master_tdone = 1;
  }
  if (p_evt->type == APP_SPI_EVT_RX_DATA) {
    g_master_rdone = 1;
  }
  if (p_evt->type == APP_SPI_EVT_ERROR) {
    g_master_tdone = 1;
    g_master_rdone = 1;
  }
}

...

//transmit pixels
g_master_tdone = 0;
app_spi_transmit_async(APP_SPI_ID_MASTER, buf, size); //<-- this is not working well. Buf won't transmit fully!
while (g_master_tdone == 0){};