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rewrite C library printf function to USART0

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This commit is contained in:
yelvlab 2024-09-22 15:37:47 +08:00
parent 58a0bcc42c
commit 097dd5714b
1 changed files with 9 additions and 4 deletions
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13
src/main.c
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@ -34,15 +34,20 @@ int main(void)
delay_ms(5000); delay_ms(5000);
bldc_enable_set(SET); bldc_enable_set(SET);
printf("system start!");
while(1){ while(1){
} }
} }
/* retarget the C library printf function to the USART */ /* retarget the C library printf function to the USART */
int fputc(int ch, FILE *f) int _write (int fd, char *pBuffer, int size)
{ {
usart_data_transmit(USART0, (uint8_t)ch); for (int i = 0; i < size; i++)
while(RESET == usart_flag_get(USART0, USART_FLAG_TBE)); {
return ch; usart_data_transmit(USART0, (uint8_t)pBuffer[i]);
while(RESET == usart_flag_get(USART0, USART_FLAG_TBE));
}
return size;
} }