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#include <unistd.h>
#include "py/mpconfig.h"
/*
* Core UART functions to implement for a port
*/
#if MICROPY_MIN_USE_STM32_MCU
typedef struct {
volatile uint32_t SR;
volatile uint32_t DR;
} periph_uart_t;
#define USART1 ((periph_uart_t *)0x40011000)
#endif
// Receive single character
int mp_hal_stdin_rx_chr(void) {
unsigned char c = 0;
#if MICROPY_MIN_USE_STDOUT
int r = read(STDIN_FILENO, &c, 1);
(void)r;
#elif MICROPY_MIN_USE_STM32_MCU
// wait for RXNE
while ((USART1->SR & (1 << 5)) == 0) {
}
c = USART1->DR;
#endif
return c;
}
// Send string of given length
void mp_hal_stdout_tx_strn(const char *str, mp_uint_t len) {
#if MICROPY_MIN_USE_STDOUT
int r = write(STDOUT_FILENO, str, len);
(void)r;
#elif MICROPY_MIN_USE_STM32_MCU
while (len--) {
// wait for TXE
while ((USART1->SR & (1 << 7)) == 0) {
}
USART1->DR = *str++;
}
#endif
}
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