如何使用lvgl驱动夏普memory lcd 分辨率400x240
官方有对应的驱动，但是具体关于esp-idf spi的初始化和数据发送并没有明确定义
我尝试写了spi初始化和数据发送，屏幕只能显示乱码
static void disp_init(void)
{
// Initialize SPI
esp_err_t ret;
// MISO not used, only Master to Slave
spi_bus_config_t buscfg = {
.mosi_io_num = _mosi,
.miso_io_num = -1,
.sclk_io_num = _clk,
.quadwp_io_num = -1,
.quadhd_io_num = -1,
.max_transfer_sz = 4094};
// max_transfer_sz 4Kb is the defaut SPI transfer size if 0
// debug: 50000 0.5 Mhz so we can sniff the SPI commands with a Slave
uint16_t multiplier = 1000;
// Config Frequency and SS GPIO
// SPI_DEVICE_TXBIT_LSBFIRST
spi_device_interface_config_t devcfg = {
.mode = 0, // SPI mode 0
.clock_speed_hz = 4 * multiplier * 1000, // Can be up to 4 Mhz
.spics_io_num = -1, // -1 == Do not control CS automatically!
.flags = SPI_DEVICE_TXBIT_LSBFIRST,
.queue_size = 5};
// DISABLED Callbacks pre_cb/post_cb. SPI does not seem to behave the same
// CS / DC GPIO states the usual way
// Initialize the SPI bus
ret = spi_bus_initialize(EPD_HOST, &buscfg, DMA_CHAN);
ESP_ERROR_CHECK(ret);
// Attach the EPD to the SPI bus
ret = spi_bus_add_device(EPD_HOST, &devcfg, &spi);
ESP_ERROR_CHECK(ret);
printf("SPI initialized. MOSI:%d CLK:%d CS:%d\n", _mosi, _clk, _cs);
// This display is weird in that _cs is active HIGH not LOW like every other SPI device
gpio_set_level((gpio_num_t)_cs, 0);
}
static void disp_flush(lv_disp_drv_t *disp_drv, const lv_area_t *area, lv_color_t *color_p)
{
/*Return if the area is out the screen*/
if (area->y2 < 0)
return;
if (area->y1 > SHARP_MIP_VER_RES - 1)
return;
/*Truncate the area to the screen*/
uint16_t act_y1 = area->y1 < 0 ? 0 : area->y1;
uint16_t act_y2 = area->y2 > SHARP_MIP_VER_RES - 1 ? SHARP_MIP_VER_RES - 1 : area->y2;
uint8_t *buf = (uint8_t *)color_p; /*Get the buffer address*/
uint16_t buf_h = (act_y2 - act_y1 + 1); /*Number of buffer lines*/
uint16_t buf_size = buf_h * (2 + SHARP_MIP_HOR_RES / 8) + 2; /*Buffer size in bytes */
/* Set lines to flush dummy byte & gate address in draw_buf*/
for (uint16_t act_y = 0; act_y < buf_h; act_y++)
{
buf[BUFIDX(0, act_y) - 1] = ((act_y1 + act_y + 1));
buf[BUFIDX(0, act_y) - 2] = 0;
}
/* Set last dummy two bytes in draw_buf */
buf[BUFIDX(0, buf_h) - 1] = 0;
buf[BUFIDX(0, buf_h) - 2] = 0;
/* Set frame header in draw_buf */
buf[0] = SHARP_MIP_HEADER |
SHARP_MIP_UPDATE_RAM_FLAG;
/* Write the frame on display memory */
gpio_set_level(GPIO_NUM_10, 1);
esp_err_t ret;
spi_transaction_t t;
memset(&t, 0, sizeof(t)); // Zero out the transaction
t.length = buf_size * 8; // Len is in bytes, transaction length is in bits.
t.tx_buffer = buf; // Data
ret = spi_device_transmit(spi, &t); // Transmit!
assert(ret == ESP_OK); // Should have had no issues.
gpio_set_level(GPIO_NUM_10, 0);
lv_disp_flush_ready(disp_drv);
}