#include "esp_intr_alloc.h"
#include "esp_log.h"
#include "esp_err.h"
+#include "esp_clk.h"
#include "malloc.h"
#include "freertos/FreeRTOS.h"
#include "freertos/semphr.h"
esp_err_t uart_set_baudrate(uart_port_t uart_num, uint32_t baud_rate)
{
UART_CHECK((uart_num < UART_NUM_MAX), "uart_num error", ESP_FAIL);
- UART_CHECK((baud_rate <= UART_BITRATE_MAX), "baud_rate error", ESP_FAIL);
- uint32_t clk_div = (((UART_CLK_FREQ) << 4) / baud_rate);
+ esp_err_t ret = ESP_OK;
UART_ENTER_CRITICAL(&uart_spinlock[uart_num]);
- UART[uart_num]->clk_div.div_int = clk_div >> 4;
- UART[uart_num]->clk_div.div_frag = clk_div & 0xf;
+ int uart_clk_freq;
+ if (UART[uart_num]->conf0.tick_ref_always_on == 0) {
+ /* this UART has been configured to use REF_TICK */
+ uart_clk_freq = REF_CLK_FREQ;
+ } else {
+ uart_clk_freq = esp_clk_apb_freq();
+ }
+ uint32_t clk_div = (((uart_clk_freq) << 4) / baud_rate);
+ if (clk_div < 16) {
+ /* baud rate is too high for this clock frequency */
+ ret = ESP_ERR_INVALID_ARG;
+ } else {
+ UART[uart_num]->clk_div.div_int = clk_div >> 4;
+ UART[uart_num]->clk_div.div_frag = clk_div & 0xf;
+ }
UART_EXIT_CRITICAL(&uart_spinlock[uart_num]);
- return ESP_OK;
+ return ret;
}
esp_err_t uart_get_baudrate(uart_port_t uart_num, uint32_t* baudrate)
} else if(uart_num == UART_NUM_2) {
periph_module_enable(PERIPH_UART2_MODULE);
}
- r=uart_set_hw_flow_ctrl(uart_num, uart_config->flow_ctrl, uart_config->rx_flow_ctrl_thresh);
- if (r!=ESP_OK) return r;
- r=uart_set_baudrate(uart_num, uart_config->baud_rate);
- if (r!=ESP_OK) return r;
-
- UART[uart_num]->conf0.val = (
- (uart_config->parity << UART_PARITY_S)
- | (uart_config->data_bits << UART_BIT_NUM_S)
- | ((uart_config->flow_ctrl & UART_HW_FLOWCTRL_CTS) ? UART_TX_FLOW_EN : 0x0)
- | UART_TICK_REF_ALWAYS_ON_M);
- r=uart_set_stop_bits(uart_num, uart_config->stop_bits);
+ r = uart_set_hw_flow_ctrl(uart_num, uart_config->flow_ctrl, uart_config->rx_flow_ctrl_thresh);
+ if (r != ESP_OK) return r;
+
+ UART[uart_num]->conf0.val =
+ (uart_config->parity << UART_PARITY_S)
+ | (uart_config->data_bits << UART_BIT_NUM_S)
+ | ((uart_config->flow_ctrl & UART_HW_FLOWCTRL_CTS) ? UART_TX_FLOW_EN : 0x0)
+ | (uart_config->use_ref_tick ? 0 : UART_TICK_REF_ALWAYS_ON_M);
+
+ r = uart_set_baudrate(uart_num, uart_config->baud_rate);
+ if (r != ESP_OK) return r;
+ r = uart_set_stop_bits(uart_num, uart_config->stop_bits);
return r;
}
esp_clk_init();
esp_perip_clk_init();
intr_matrix_clear();
+
#ifndef CONFIG_CONSOLE_UART_NONE
- uart_div_modify(CONFIG_CONSOLE_UART_NUM, (rtc_clk_apb_freq_get() << 4) / CONFIG_CONSOLE_UART_BAUDRATE);
-#endif
+#ifdef CONFIG_PM_ENABLE
+ const int uart_clk_freq = REF_CLK_FREQ;
+ /* When DFS is enabled, use REFTICK as UART clock source */
+ CLEAR_PERI_REG_MASK(UART_CONF0_REG(CONFIG_CONSOLE_UART_NUM), UART_TICK_REF_ALWAYS_ON);
+#else
+ const int uart_clk_freq = APB_CLK_FREQ;
+#endif // CONFIG_PM_DFS_ENABLE
+ uart_div_modify(CONFIG_CONSOLE_UART_NUM, (uart_clk_freq << 4) / CONFIG_CONSOLE_UART_BAUDRATE);
+#endif // CONFIG_CONSOLE_UART_NONE
+
#if CONFIG_BROWNOUT_DET
esp_brownout_init();
#endif