用STM32F410RBT开发一个应用程序，并使用uECC库生成密钥对。无法将密钥对打印到控制台。
int _write(int file, char *ptr, int len) {
int i = 0;
for (i = 0; i < len; i++)
ITM_SendChar((*ptr++));
return len;
}
uint8_t private[32] = { 0 };
uint8_t public[64] = { 0 };
using uECC_make_key generate public and private keys
printf(public[0]); /* warning : passing argument 1 of 'printf' makes pointer from integer without a cast */
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