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fix(uart): LP UART does not have the pre-divider for its clock source

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Closes https://github.com/espressif/esp-idf/issues/15427
This commit is contained in:
Song Ruo Jing
2025-02-24 21:27:41 +08:00
parent 488200ffbd
commit ce808b09cd
17 changed files with 207 additions and 218 deletions
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24
components/hal/esp32/include/hal/uart_ll.h
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@@ -183,17 +183,23 @@ FORCE_INLINE_ATTR void uart_ll_get_sclk(uart_dev_t *hw, soc_module_clk_t *source
* @param baud The baud-rate to be set. When the source clock is APB, the max baud-rate is `UART_LL_BITRATE_MAX`
* @param sclk_freq Frequency of the clock source of UART, in Hz.
* @return None
* @return True if baud-rate set successfully; False if baud-rate requested cannot be achieved
*/
FORCE_INLINE_ATTR void uart_ll_set_baudrate(uart_dev_t *hw, uint32_t baud, uint32_t sclk_freq)
FORCE_INLINE_ATTR bool uart_ll_set_baudrate(uart_dev_t *hw, uint32_t baud, uint32_t sclk_freq)
{
uint32_t clk_div;
clk_div = ((sclk_freq) << 4) / baud;
// The baud-rate configuration register is divided into
// an integer part and a fractional part.
hw->clk_div.div_int = clk_div >> 4;
hw->clk_div.div_frag = clk_div & 0xf;
if (baud == 0) {
return false;
}
uint32_t clk_div = ((sclk_freq) << 4) / baud;
// The baud-rate configuration register is divided into an integer part and a fractional part.
uint32_t clkdiv_int = clk_div >> 4;
if (clkdiv_int > UART_CLKDIV_V) {
return false; // unachievable baud-rate
}
uint32_t clkdiv_frag = clk_div & 0xf;
hw->clk_div.div_int = clkdiv_int;
hw->clk_div.div_frag = clkdiv_frag;
return true;
}
/**