Umesh Lokhande
Umesh Lokhande
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DIIDevHeads IoT Integration Server
Created by Okpara Elvis on 12/31/2024 in #🪲-firmware-and-baremetal
Why isn’t my printf output showing on the SWV ITM console for STM32F401CDU6?
In syscalls.c file you need to add few more lines of code at the top. Here it is 
// Debug Exception & Monitor Control Register Base Address
#define DEMCR                     *((volatile uint32_t*) 0xE000EDFCU)

//ITM Register Address
#define ITM_STIMULUS_PORT0        *((volatile uint32_t*) 0xE0000000)
#define ITM_TRACE_EN            *((volatile uint32_t*) 0xE0000E00)

void ITM_SendChar(uint8_t ch)
{
    // Enable TRCENA
    DEMCR |= (1<<24);

    // Enable Stimulus Port0
    ITM_TRACE_EN |= (1<<0);

    // Read FIFO Status in bit[0]:
    while(!(ITM_STIMULUS_PORT0 & 1));

    // Write to ITM Stimulus Port0
    ITM_STIMULUS_PORT0 = ch;
}
// Debug Exception & Monitor Control Register Base Address
#define DEMCR                     *((volatile uint32_t*) 0xE000EDFCU)

//ITM Register Address
#define ITM_STIMULUS_PORT0        *((volatile uint32_t*) 0xE0000000)
#define ITM_TRACE_EN            *((volatile uint32_t*) 0xE0000E00)

void ITM_SendChar(uint8_t ch)
{
    // Enable TRCENA
    DEMCR |= (1<<24);

    // Enable Stimulus Port0
    ITM_TRACE_EN |= (1<<0);

    // Read FIFO Status in bit[0]:
    while(!(ITM_STIMULUS_PORT0 & 1));

    // Write to ITM Stimulus Port0
    ITM_STIMULUS_PORT0 = ch;
}
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