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Fixes baudrate with CPU Freq < 80MHz (#6037)

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This PR fixes an issue with UART when CPUFreq is lower than 80MHz (APB Freq)
This commit is contained in:
Rodrigo Garcia
2021-12-21 05:10:31 -03:00
committed by GitHub
parent d6934a5289
commit c3d41c9b54
1 changed files with 15 additions and 2 deletions
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17
cores/esp32/esp32-hal-uart.c
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@ -69,6 +69,19 @@ static uart_t _uart_bus_array[] = {
#endif #endif
// solves issue https://github.com/espressif/arduino-esp32/issues/6032
// baudrate must be multiplied when CPU Frequency is lower than APB 80MHz
uint32_t _get_effective_baudrate(uint32_t baudrate)
{
uint32_t Freq = getApbFrequency()/1000000;
if (Freq < 80) {
return 80 / Freq * baudrate;
}
else {
return baudrate;
}
}
bool uartIsDriverInstalled(uart_t* uart) bool uartIsDriverInstalled(uart_t* uart)
{ {
if(uart == NULL) { if(uart == NULL) {
@ -121,7 +134,7 @@ uart_t* uartBegin(uint8_t uart_nr, uint32_t baudrate, uint32_t config, int8_t rx
UART_MUTEX_LOCK(); UART_MUTEX_LOCK();
uart_config_t uart_config; uart_config_t uart_config;
uart_config.baud_rate = baudrate; uart_config.baud_rate = _get_effective_baudrate(baudrate);
uart_config.data_bits = (config & 0xc) >> 2; uart_config.data_bits = (config & 0xc) >> 2;
uart_config.parity = (config & 0x3); uart_config.parity = (config & 0x3);
uart_config.stop_bits = (config & 0x30) >> 4; uart_config.stop_bits = (config & 0x30) >> 4;
@ -307,7 +320,7 @@ void uartSetBaudRate(uart_t* uart, uint32_t baud_rate)
return; return;
} }
UART_MUTEX_LOCK(); UART_MUTEX_LOCK();
uart_ll_set_baudrate(UART_LL_GET_HW(uart->num), baud_rate); uart_ll_set_baudrate(UART_LL_GET_HW(uart->num), _get_effective_baudrate(baud_rate));
UART_MUTEX_UNLOCK(); UART_MUTEX_UNLOCK();
} }