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esp32/uart: Use xtal as UART clock source on S3 and C3.

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Change UART clock source on S3/C3 so the UART can operate when CPU
frequency is below 80MHz.  This allows the UART to remain operational when
using Dynamic Frequency Scaling (DFS).

Signed-off-by: Patrick Joy <patrick@joytech.com.au>
This commit is contained in:
patrick 2023-05-14 17:36:56 +10:00 committed by Damien George
parent 05e143dbdd
commit a802f71908
2 changed files with 8 additions and 0 deletions
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4
ports/esp32/machine_uart.c
View File

@ -319,6 +319,10 @@ STATIC mp_obj_t machine_uart_make_new(const mp_obj_type_t *type, size_t n_args,
.flow_ctrl = UART_HW_FLOWCTRL_DISABLE,
.rx_flow_ctrl_thresh = 0
};
#if SOC_UART_SUPPORT_XTAL_CLK
// works independently of APB frequency
uartcfg.source_clk = UART_SCLK_XTAL; // ESP32C3, ESP32S3
#endif
// create instance
machine_uart_obj_t *self = mp_obj_malloc(machine_uart_obj_t, &machine_uart_type);

4
ports/esp32/uart.c
View File

@ -46,6 +46,10 @@ void uart_stdout_init(void) {
.flow_ctrl = UART_HW_FLOWCTRL_DISABLE,
.rx_flow_ctrl_thresh = 0
};
#if SOC_UART_SUPPORT_XTAL_CLK
// works independently of APB frequency
uartcfg.source_clk = UART_SCLK_XTAL; // ESP32C3, ESP32S3
#endif
uart_param_config(MICROPY_HW_UART_REPL, &uartcfg);
const uint32_t rxbuf = 129; // IDF requires > 128 min