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Improve ESP flasher baud rate setting

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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
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src/common/platforms/esp8266/stubs/uart.c
+10 -4
View File
@@ -18,9 +18,15 @@
#include "uart.h"
#include "ets_sys.h"
#define UART_CLKDIV_26MHZ(B) (52000000 + B / 2) / B
#define UART_CLKDIV_M (UART_CLKDIV_CNT << UART_CLKDIV_S)
void set_baud_rate(uint32_t uart_no, uint32_t baud_rate) {
uint32_t div = UART_CLKDIV_26MHZ(baud_rate);
WRITE_PERI_REG(UART_CLKDIV_REG(uart_no), div & 0xfffff);
void uart_div_modify(uint8_t uart_no, uint32_t div);
uint32_t set_baud_rate(uint32_t uart_no, uint32_t old_baud_rate,
uint32_t new_baud_rate) {
uint32_t uart_reg = READ_PERI_REG(UART_CLKDIV_REG(uart_no));
uint32_t uart_div = uart_reg & UART_CLKDIV_M;
uint32_t master_freq = uart_div * old_baud_rate;
uart_div_modify(uart_no, master_freq / new_baud_rate);
return uart_div;
}