Commander1024
535c27350d
Add versioned NVS-backed configuration, buffered UART1 I/O, modem monitoring, counters, and serial console controls. Coordinate UART1 ownership with Phase 0 diagnostics and document loopback verification.
90 lines
2.2 KiB
C
90 lines
2.2 KiB
C
#include "rs232_port_owner.h"
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#include "freertos/FreeRTOS.h"
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#include "freertos/semphr.h"
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static SemaphoreHandle_t s_owner_mutex;
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static rs232_port_owner_t s_owner = RS232_PORT_OWNER_NONE;
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esp_err_t rs232_port_owner_init(void)
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{
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if (s_owner_mutex != NULL) {
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return ESP_ERR_INVALID_STATE;
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}
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s_owner_mutex = xSemaphoreCreateMutex();
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return s_owner_mutex != NULL ? ESP_OK : ESP_ERR_NO_MEM;
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}
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esp_err_t rs232_port_claim(rs232_port_owner_t owner)
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{
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if (s_owner_mutex == NULL || owner == RS232_PORT_OWNER_NONE || owner == RS232_PORT_OWNER_FAULT) {
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return ESP_ERR_INVALID_ARG;
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}
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xSemaphoreTake(s_owner_mutex, portMAX_DELAY);
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esp_err_t result = ESP_ERR_INVALID_STATE;
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if (s_owner == RS232_PORT_OWNER_NONE) {
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s_owner = owner;
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result = ESP_OK;
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}
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xSemaphoreGive(s_owner_mutex);
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return result;
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}
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esp_err_t rs232_port_release(rs232_port_owner_t owner)
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{
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if (s_owner_mutex == NULL) {
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return ESP_ERR_INVALID_STATE;
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}
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xSemaphoreTake(s_owner_mutex, portMAX_DELAY);
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esp_err_t result = ESP_ERR_INVALID_STATE;
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if (s_owner == owner) {
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s_owner = RS232_PORT_OWNER_NONE;
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result = ESP_OK;
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}
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xSemaphoreGive(s_owner_mutex);
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return result;
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}
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void rs232_port_mark_fault(rs232_port_owner_t previous_owner)
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{
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if (s_owner_mutex == NULL) {
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return;
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}
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xSemaphoreTake(s_owner_mutex, portMAX_DELAY);
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if (s_owner == previous_owner) {
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s_owner = RS232_PORT_OWNER_FAULT;
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}
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xSemaphoreGive(s_owner_mutex);
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}
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rs232_port_owner_t rs232_port_get_owner(void)
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{
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if (s_owner_mutex == NULL) {
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return RS232_PORT_OWNER_FAULT;
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}
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xSemaphoreTake(s_owner_mutex, portMAX_DELAY);
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rs232_port_owner_t owner = s_owner;
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xSemaphoreGive(s_owner_mutex);
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return owner;
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}
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const char *rs232_port_owner_to_string(rs232_port_owner_t owner)
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{
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switch (owner) {
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case RS232_PORT_OWNER_NONE:
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return "idle";
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case RS232_PORT_OWNER_PHASE0:
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return "Phase 0 diagnostics";
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case RS232_PORT_OWNER_SERVICE:
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return "serial service";
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case RS232_PORT_OWNER_FAULT:
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return "fault (reboot required)";
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default:
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return "unknown";
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}
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}
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