Jens Alfke ce1fe776cf cpu/esp32: allow explicit ESP32 crystal freq configuration ... Some ESP32 boards (like my SparkFun ESP32 Thing) have a main clock crystal that runs at 26MHz, not 40MHz. RIOT appears to assume 40MHz. The mismatch causes the UART to not sync properly, resulting in garbage written to the terminal instead of log output. I’ve added: * A new board configuration constant ESP32_XTAL_FREQ that defaults to 40, but can be overridden by a board def or at build time to force a specific value (i.e. 26). * Some code spliced into system_clk_init() to check this constant and call rtc_clk_init() to set the correct frequency. * A copy of the rtf_clk_init() function from the ESP-IDF sources. Fixes #10272		2018-10-30 16:42:07 -07:00
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include	cpu/esp32: allow explicit ESP32 crystal freq configuration	2018-10-30 16:42:07 -07:00
board_common.c	boards: add common esp32 based sources	2018-10-08 12:20:49 +02:00
doc.txt	boards: add common esp32 based sources	2018-10-08 12:20:49 +02:00
Makefile	boards: add common esp32 based sources	2018-10-08 12:20:49 +02:00
Makefile.dep	boards: add common esp32 based sources	2018-10-08 12:20:49 +02:00
Makefile.features	boards: add common esp32 based sources	2018-10-08 12:20:49 +02:00
Makefile.include	boards: add common esp32 based sources	2018-10-08 12:20:49 +02:00