54729247e1
Minimal support code for a Cortex-M CPU is added, along with set-up code for an STM32F4xx MCU, including a UART for a REPL. Tested on a pyboard. Code size is 77592 bytes.
45 lines
909 B
C
45 lines
909 B
C
#include <unistd.h>
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#include "py/mpconfig.h"
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/*
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* Core UART functions to implement for a port
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*/
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#if MICROPY_MIN_USE_STM32_MCU
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typedef struct {
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volatile uint32_t SR;
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volatile uint32_t DR;
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} periph_uart_t;
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#define USART1 ((periph_uart_t*)0x40011000)
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#endif
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// Receive single character
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int mp_hal_stdin_rx_chr(void) {
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unsigned char c = 0;
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#if MICROPY_MIN_USE_STDOUT
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int r = read(0, &c, 1);
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(void)r;
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#elif MICROPY_MIN_USE_STM32_MCU
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// wait for RXNE
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while ((USART1->SR & (1 << 5)) == 0) {
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}
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c = USART1->DR;
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#endif
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return c;
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}
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// Send string of given length
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void mp_hal_stdout_tx_strn(const char *str, mp_uint_t len) {
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#if MICROPY_MIN_USE_STDOUT
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int r = write(1, str, len);
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(void)r;
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#elif MICROPY_MIN_USE_STM32_MCU
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while (len--) {
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// wait for TXE
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while ((USART1->SR & (1 << 7)) == 0) {
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}
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USART1->DR = *str++;
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}
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#endif
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}
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