STMG01 Baremetal UART not Working

Forum|Forum|2 years ago
April 1, 2024
4 replies
2033 views

Hi, I wonder has anyone experience with baremetal USART implementation as I have attached a Source file for USART for a 'STM32G0B1RET' discovery board but it just sits there and doesn't transmit anything? See attached (usart.c). I have basically just copied this from a working F4 board and modified it for a G0 board (assuming it would work!?)...

usart.c

main.c

usart.h

STM32G0 series

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Best answer by waclawek.jan

> 'STM32G0B1RET' discovery board

Do you mean Nucleo board?

I compiled your code (commenting out SetSystemClockTo16Mhz() as you did not provide that function, but simply leaving the default HSI16 clock, that's 16MHz too), and on Nucleo I can see the transmitted data on PA2 (and also LED on PA5 blinking slowly).

JW

PS. You set USART2_BRR in USART1 setup, but you don't call that function here.

waclawek.janBest answer

Super User

> 'STM32G0B1RET' discovery board

Do you mean Nucleo board?

I compiled your code (commenting out SetSystemClockTo16Mhz() as you did not provide that function, but simply leaving the default HSI16 clock, that's 16MHz too), and on Nucleo I can see the transmitted data on PA2 (and also LED on PA5 blinking slowly).

JW

PS. You set USART2_BRR in USART1 setup, but you don't call that function here.

PLee.3Author

Associate II

Hi JW,

Thanks for trying it out I have just had a closer look and something really odd is happening if you use "UART2_send" it transmits to UART1 TX (PC4) and if you use "UART1_send" it transmits to UART2 TX (PA2)? I can't workout why it's doing this as the UART send commands it clearly states the correct Registries:-

void UART1_send(char *msg, size_t len){
for (uint64_t i=0; i<len; i++)
{
 // send character
 USART1->TDR = msg[i];
 // wait for transmit complete (ts)
 while(!(USART1->ISR & (1 << 6)));
}
}