Hi:
I used nrf52840 to drive a 240 * 240 LCD screen, when i use SPI, it's work normal.
#define SPI_INSTANCE 0 /**< SPI instance index. */
static const nrf_drv_spi_t lcd_spi = NRF_DRV_SPI_INSTANCE(SPI_INSTANCE); /**< SPI instance. */
static volatile bool spi_xfer_done; /**< Flag used to indicate that SPI instance completed the transfer. */
static uint8_t m_rx_buf[1]; /**< RX buffer. */
static void spi_event_handler(nrf_drv_spi_evt_t const * p_event, void * p_context);
ret_code_t lcd_spi_init(void)
{
nrf_drv_spi_config_t const spi_config =
{
.sck_pin = LCD_SCL,
.mosi_pin = LCD_SDA,
.miso_pin = NRF_DRV_SPI_PIN_NOT_USED,
.ss_pin = LCD_CS,
.irq_priority = APP_IRQ_PRIORITY_LOWEST,
.orc = 0xFF,
.frequency = NRF_DRV_SPI_FREQ_8M,
.mode = NRF_DRV_SPI_MODE_0,
.bit_order = NRF_DRV_SPI_BIT_ORDER_MSB_FIRST
};
return nrf_drv_spi_init(&lcd_spi, &spi_config, NULL, NULL);
}
void lcd_spi_uninit(void)
{
nrf_drv_spi_uninit(&lcd_spi);
}
/**
* @brief SPI user event handler.
* @param event
*/
static void spi_event_handler(nrf_drv_spi_evt_t const * p_event, void * p_context)
{
spi_xfer_done = true;
NRF_LOG_INFO("Transfer completed.");
}
void lcd_spi_write(uint8_t* m_tx_buf, uint32_t m_length)
{
while(true)
{
if(m_length <= 255)
{
nrf_drv_spi_transfer(&lcd_spi, m_tx_buf, m_length, m_rx_buf, 0);
break;
}
else
{
nrf_drv_spi_transfer(&lcd_spi, m_tx_buf, 255, m_rx_buf, 0);
m_tx_buf += 255;
m_length -= 255;
}
}
}
when i used SPIM, it's work wrong.
#define SPI_INSTANCE 3 /**< SPI instance index. */
static const nrfx_spim_t lcd_spi = NRFX_SPIM_INSTANCE(SPI_INSTANCE); /**< SPI instance. */
static volatile bool spi_xfer_done; /**< Flag used to indicate that SPI instance completed the transfer. */
static uint8_t m_rx_buf[1]; /**< RX buffer. */
static nrfx_spim_xfer_desc_t driver_spim_xfer;
static void spi_event_handler(nrf_drv_spi_evt_t const * p_event, void * p_context);
void spi_event_handler_m(nrfx_spim_evt_t const * p_event, void * p_context);//中断函数
ret_code_t lcd_spi_init(void)
{
nrfx_spim_config_t spi_config = NRFX_SPIM_DEFAULT_CONFIG;
spi_config.frequency = NRF_SPIM_FREQ_8M;
spi_config.ss_pin = NRFX_SPIM_PIN_NOT_USED;
spi_config.miso_pin = NRFX_SPIM_PIN_NOT_USED;
spi_config.mosi_pin = LCD_SDA;
spi_config.sck_pin = LCD_SCL;
spi_config.dcx_pin = NRFX_SPIM_PIN_NOT_USED;
spi_config.orc = 0xFF;
spi_config.bit_order = NRF_SPIM_BIT_ORDER_MSB_FIRST;//高位在前
spi_config.mode = NRF_SPIM_MODE_0;
spi_config.ss_active_high = false;
return nrfx_spim_init(&lcd_spi, &spi_config, spi_event_handler_m, NULL);
}
void spi_event_handler_m(nrfx_spim_evt_t const * p_event, void * p_context)//中断函数
{
spi_xfer_done = true;
}
void lcd_spi_write(uint8_t* m_tx_buf, uint32_t m_length)
{
while(true)
{
if(m_length <= 255)
{
driver_spim_xfer.tx_length = m_length;
driver_spim_xfer.p_tx_buffer = m_tx_buf;
driver_spim_xfer.rx_length = 0;
driver_spim_xfer.p_rx_buffer = m_rx_buf;
spi_xfer_done = false;
nrfx_spim_xfer(&lcd_spi, &driver_spim_xfer, 0);
while(!spi_xfer_done)
{
__WFE();
}
break;
}
else
{
driver_spim_xfer.tx_length = 255;
driver_spim_xfer.p_tx_buffer = m_tx_buf;
driver_spim_xfer.rx_length = 0;
driver_spim_xfer.p_rx_buffer = m_rx_buf;
spi_xfer_done = false;
nrfx_spim_xfer(&lcd_spi, &driver_spim_xfer, 0);
while(!spi_xfer_done)
{
__WFE();
}
m_tx_buf += 255;
m_length -= 255;
}
}
}
Did I do something wrong？
