hoverboard-firmware-hack-fo.../Src/syscalls.c

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#include <reent.h>
#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <string.h>
#include "stm32f1xx_hal.h"
#include "config.h"
extern volatile uint8_t uart_buf[200];
/*
* printf sends its output to this function, this function sends it to the uart dma output buffer
*/
__attribute__((__used__)) int _write(int fd, const char *ptr, int len){
#if defined DEBUG_SERIAL_ASCII && (defined DEBUG_SERIAL_USART2 || defined DEBUG_SERIAL_USART3)
#ifdef DEBUG_SERIAL_USART2
while(DMA1_Channel7->CNDTR != 0); // wait
memcpy(uart_buf,ptr,len); // copy to buffer
DMA1_Channel7->CCR &= ~DMA_CCR_EN;
DMA1_Channel7->CNDTR = len; // set number of bytes to read
DMA1_Channel7->CMAR = (uint32_t)uart_buf; // set buffer to read from
DMA1_Channel7->CCR |= DMA_CCR_EN;
#endif
#ifdef DEBUG_SERIAL_USART3
while(DMA1_Channel2->CNDTR != 0); // wait
memcpy(uart_buf,ptr,len); // copy to buffer
DMA1_Channel2->CCR &= ~DMA_CCR_EN;
DMA1_Channel2->CNDTR = len; // set number of bytes to read
DMA1_Channel2->CMAR = (uint32_t)uart_buf; // set buffer to read from
DMA1_Channel2->CCR |= DMA_CCR_EN;
#endif
#endif
return len;
}