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fix(uart): clock source (#10172)

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Problem detected with ESP32 and ESP32-S2 when the baudrate goes to 460600 bps.

REF_TICK (2MHz) seem not to work properly.
Limiting the use of REF_TICK for up to 205 Kbps.
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Rodrigo Garcia 2024-08-16 10:42:18 -03:00 committed by GitHub
parent 49a3c10ce0
commit 2a971751a7
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GPG key ID: B5690EEEBB952194
1 changed files with 2 additions and 2 deletions
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cores/esp32/esp32-hal-uart.c
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@ -508,8 +508,8 @@ uart_t *uartBegin(
#if SOC_UART_SUPPORT_XTAL_CLK #if SOC_UART_SUPPORT_XTAL_CLK
uart_config.source_clk = UART_SCLK_XTAL; // valid for C2, S3, C3, C6, H2 and P4 uart_config.source_clk = UART_SCLK_XTAL; // valid for C2, S3, C3, C6, H2 and P4
#elif SOC_UART_SUPPORT_REF_TICK #elif SOC_UART_SUPPORT_REF_TICK
if (baudrate <= 1000000) { if (baudrate <= 250000) {
uart_config.source_clk = UART_SCLK_REF_TICK; // valid for ESP32, S2 - MAX supported baud rate is 1MHz uart_config.source_clk = UART_SCLK_REF_TICK; // valid for ESP32, S2 - MAX supported baud rate is 250 Kbps
} else { } else {
uart_config.source_clk = UART_SCLK_APB; // baudrate may change with the APB Frequency! uart_config.source_clk = UART_SCLK_APB; // baudrate may change with the APB Frequency!
} }