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feat(mcpwm): check if the gpio used by generator is reserved by others

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This commit is contained in:
morris
2024-05-24 22:57:53 +08:00
parent 003f3bb5dc
commit 80f5444f86
1 changed files with 12 additions and 1 deletions
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13
components/esp_driver_mcpwm/src/mcpwm_gen.c
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@@ -24,6 +24,7 @@
#include "driver/gpio.h"
#include "driver/mcpwm_gen.h"
#include "mcpwm_private.h"
#include "esp_private/esp_gpio_reserve.h"
static const char *TAG = "mcpwm";
@@ -84,6 +85,7 @@ esp_err_t mcpwm_new_generator(mcpwm_oper_handle_t oper, const mcpwm_generator_co
mcpwm_hal_generator_reset(hal, oper_id, gen_id);
// GPIO configuration
gen->gen_gpio_num = -1; // gpio not initialized yet
gpio_config_t gpio_conf = {
.intr_type = GPIO_INTR_DISABLE,
// also enable the input path if `io_loop_back` is enabled
@@ -93,6 +95,12 @@ esp_err_t mcpwm_new_generator(mcpwm_oper_handle_t oper, const mcpwm_generator_co
.pull_up_en = config->flags.pull_up,
};
ESP_GOTO_ON_ERROR(gpio_config(&gpio_conf), err, TAG, "config gen GPIO failed");
// reserve the GPIO output path, because we don't expect another peripheral to signal to the same GPIO
uint64_t old_gpio_rsv_mask = esp_gpio_reserve(BIT64(config->gen_gpio_num));
// check if the GPIO is already used by others
if (old_gpio_rsv_mask & BIT64(config->gen_gpio_num)) {
ESP_LOGW(TAG, "GPIO %d is not usable, maybe conflict with others", config->gen_gpio_num);
}
esp_rom_gpio_connect_out_signal(config->gen_gpio_num,
mcpwm_periph_signals.groups[group->group_id].operators[oper_id].generators[gen_id].pwm_sig,
config->flags.invert_pwm, 0);
@@ -119,7 +127,10 @@ esp_err_t mcpwm_del_generator(mcpwm_gen_handle_t gen)
ESP_LOGD(TAG, "del generator (%d,%d,%d)", group->group_id, oper->oper_id, gen->gen_id);
// reset GPIO
gpio_reset_pin(gen->gen_gpio_num);
if (gen->gen_gpio_num >= 0) {
gpio_reset_pin(gen->gen_gpio_num);
esp_gpio_revoke(BIT64(gen->gen_gpio_num));
}
// recycle memory resource
ESP_RETURN_ON_ERROR(mcpwm_generator_destroy(gen), TAG, "destroy generator failed");
return ESP_OK;