esp32: wait uart tx finish before cpu freq change
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2 changed files with 13 additions and 2 deletions
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@ -14,6 +14,7 @@
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#include <stdint.h>
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#include "rom/ets_sys.h"
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#include "rom/uart.h"
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#include "sdkconfig.h"
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typedef enum{
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@ -42,10 +43,15 @@ extern void rtc_set_cpu_freq(xtal_freq_t xtal_freq, cpu_freq_t cpu_freq);
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* components which want to be notified of CPU frequency
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* changes.
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*/
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void esp_set_cpu_freq()
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void esp_set_cpu_freq(void)
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{
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uint32_t freq_mhz = CONFIG_ESP32_DEFAULT_CPU_FREQ_MHZ;
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phy_get_romfunc_addr();
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// freq will be changed to 40MHz in rtc_init_lite,
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// wait uart tx finish, otherwise some uart output will be lost
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uart_tx_wait_idle(0);
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rtc_init_lite();
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cpu_freq_t freq = CPU_80M;
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switch(freq_mhz) {
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@ -62,6 +68,11 @@ void esp_set_cpu_freq()
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freq = CPU_80M;
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break;
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}
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// freq will be changed to freq in rtc_set_cpu_freq,
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// wait uart tx finish, otherwise some uart output will be lost
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uart_tx_wait_idle(0);
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rtc_set_cpu_freq(XTAL_AUTO, freq);
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ets_update_cpu_frequency(freq_mhz);
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}
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@ -76,6 +76,6 @@ static inline void cpu_configure_region_protection()
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* This is a temporary function which will be replaced once dynamic
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* CPU frequency changing is implemented.
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*/
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void esp_set_cpu_freq();
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void esp_set_cpu_freq(void);
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#endif
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