wt/mongoose
1
0 Fork 0
mirror of https://github.com/cesanta/mongoose.git synced 2026-11-07 16:01:30 +00:00
Code Issues Packages Projects Releases Wiki Activity

Improve ESP flasher baud rate setting

Browse Source 
Use old baud rate and autodetected divider to calculate new divider.

This works better with higher baud rates and drifting clocks.

CL: mos: Improve ESP flasher baud rate setting

PUBLISHED_FROM=7761e756c3ae7cc76e3b9a4fe3e40d06a779b2e8
This commit is contained in:
Deomid Ryabkov authored and Cesanta Bot committed 2019-02-08 17:38:55 +00:00
1 parent 95a36b1759
commit 0b2e474d52
8 files changed
+43 -23
Download Patch File Download Diff File Expand all files Collapse all files

No files matched your search

src/common/platforms/esp32/stubs/uart.c
+9 -5
View File
@@ -19,9 +19,13 @@
#include "rom_functions.h"
void set_baud_rate(uint32_t uart_no, uint32_t baud_rate) {
uint32_t master_freq = ets_get_detected_xtal_freq() << 4;
master_freq += (baud_rate / 2);
uint32_t div = master_freq / baud_rate;
uart_div_modify(uart_no, div);
uint32_t set_baud_rate(uint32_t uart_no, uint32_t old_baud_rate,
uint32_t new_baud_rate) {
uint32_t uart_reg = REG_READ(UART_CLKDIV_REG(uart_no));
uint32_t uart_div = uart_reg & UART_CLKDIV_M;
uint32_t fraction = (uart_reg >> UART_CLKDIV_FRAG_S) & UART_CLKDIV_FRAG_V;
uart_div = (uart_div << 4) + fraction;
uint32_t master_freq = uart_div * old_baud_rate;
uart_div_modify(uart_no, master_freq / new_baud_rate);
return uart_div;
}