alex/esp-idf
1
0
Fork 0
mirror of https://github.com/espressif/esp-idf.git synced 2025-08-11 21:10:20 +00:00
Code Issues Packages Projects Releases Wiki Activity

lcd: allow execlusive use of i80 bus

Browse Source
This commit is contained in:
morris
2021-08-24 20:37:58 +08:00
parent 02e470bc50
commit 7dc9c7aa05
5 changed files with 84 additions and 15 deletions
Download Patch File Download Diff File Expand all files Collapse all files

31
components/esp_lcd/src/esp_lcd_panel_io_i80.c
View File

@@ -65,6 +65,9 @@ struct esp_lcd_i80_bus_t {
lcd_i80_trans_descriptor_t *cur_trans; // Current transaction
lcd_panel_io_i80_t *cur_device; // Current working device
LIST_HEAD(i80_device_list, lcd_panel_io_i80_t) device_list; // Head of i80 device list
struct {
unsigned int exclusive: 1; // Indicate whether the I80 bus is owned by one device (whose CS GPIO is not assigned) exclusively
} flags;
dma_descriptor_t dma_nodes[]; // DMA descriptor pool, the descriptors are shared by all i80 devices
};
@@ -219,7 +222,17 @@ esp_err_t esp_lcd_new_panel_io_i80(esp_lcd_i80_bus_handle_t bus, const esp_lcd_p
{
esp_err_t ret = ESP_OK;
lcd_panel_io_i80_t *i80_device = NULL;
bool bus_exclusive = false;
ESP_GOTO_ON_FALSE(bus && io_config && ret_io, ESP_ERR_INVALID_ARG, err, TAG, "invalid argument");
// check if the bus has been configured as exclusive
portENTER_CRITICAL(&bus->spinlock);
if (!bus->flags.exclusive) {
bus->flags.exclusive = io_config->cs_gpio_num < 0;
} else {
bus_exclusive = true;
}
portEXIT_CRITICAL(&bus->spinlock);
ESP_GOTO_ON_FALSE(!bus_exclusive, ESP_ERR_INVALID_STATE, err, TAG, "bus has been exclusively owned by device");
// check if pixel clock setting is valid
uint32_t pclk_prescale = bus->resolution_hz / io_config->pclk_hz;
ESP_GOTO_ON_FALSE(pclk_prescale > 0 && pclk_prescale <= LCD_LL_CLOCK_PRESCALE_MAX, ESP_ERR_NOT_SUPPORTED, err, TAG,
@@ -261,9 +274,11 @@ esp_err_t esp_lcd_new_panel_io_i80(esp_lcd_i80_bus_handle_t bus, const esp_lcd_p
i80_device->base.tx_color = panel_io_i80_tx_color;
// we only configure the CS GPIO as output, don't connect to the peripheral signal at the moment
// we will connect the CS GPIO to peripheral signal when switching devices in lcd_i80_switch_devices()
gpio_set_level(io_config->cs_gpio_num, !io_config->flags.cs_active_high);
gpio_set_direction(io_config->cs_gpio_num, GPIO_MODE_OUTPUT);
gpio_hal_iomux_func_sel(GPIO_PIN_MUX_REG[io_config->cs_gpio_num], PIN_FUNC_GPIO);
if (io_config->cs_gpio_num >= 0) {
gpio_set_level(io_config->cs_gpio_num, !io_config->flags.cs_active_high);
gpio_set_direction(io_config->cs_gpio_num, GPIO_MODE_OUTPUT);
gpio_hal_iomux_func_sel(GPIO_PIN_MUX_REG[io_config->cs_gpio_num], PIN_FUNC_GPIO);
}
*ret_io = &(i80_device->base);
ESP_LOGD(TAG, "new i80 lcd panel io @%p on bus(%d)", i80_device, bus->bus_id);
return ESP_OK;
@@ -541,13 +556,15 @@ static void lcd_i80_switch_devices(lcd_panel_io_i80_t *cur_device, lcd_panel_io_
// configure DC line level for the new device
lcd_ll_set_dc_level(bus->hal.dev, next_device->dc_levels.dc_idle_level, next_device->dc_levels.dc_cmd_level,
next_device->dc_levels.dc_dummy_level, next_device->dc_levels.dc_data_level);
if (cur_device) {
if (cur_device && cur_device->cs_gpio_num >= 0) {
// disconnect current CS GPIO from peripheral signal
esp_rom_gpio_connect_out_signal(cur_device->cs_gpio_num, SIG_GPIO_OUT_IDX, false, false);
}
// connect CS signal to the new device
esp_rom_gpio_connect_out_signal(next_device->cs_gpio_num, lcd_periph_signals.buses[bus->bus_id].cs_sig,
next_device->flags.cs_active_high, false);
if (next_device->cs_gpio_num >= 0) {
// connect CS signal to the new device
esp_rom_gpio_connect_out_signal(next_device->cs_gpio_num, lcd_periph_signals.buses[bus->bus_id].cs_sig,
next_device->flags.cs_active_high, false);
}
}
}