Created
September 19, 2024 22:48
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| #include <stdint.h> | |
| #include <stdlib.h> | |
| #include <stdbool.h> | |
| #include <stdio.h> | |
| extern void busy_loop(void); | |
| extern volatile uint32_t LEDS; | |
| extern volatile struct { | |
| struct { | |
| bool tx_ready : 1; | |
| } control; | |
| uint32_t input; | |
| uint32_t output; | |
| } UART; | |
| void uart_send(const char* s) { | |
| for (size_t i = 0; s[i]; i++) { | |
| while (!UART.control.tx_ready); | |
| UART.output = s[i]; | |
| } | |
| } | |
| void main(void) { | |
| uint8_t n = 0; | |
| char message[64]; | |
| while (1) { | |
| snprintf(message, sizeof(message), "Hello, uart %i!\r\n", n++ % 100); | |
| uart_send(message); | |
| busy_loop(); | |
| } | |
| } |
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