".text"' will not fit in region "FLASH"

[akael]

Hello,
I am starting to use WCH microcontroller using MounRiver IDE, in particular the CH32V003F4U6, this uC has 16K flash and SRAM 2K,
I use this a simple code:

#include "debug.h"

/* Global define */
_Bool Sx_Op_Flag = 0;
float Temperature = 0.0;
uint16_t iData_SPI=0;


/* Global Variable */
uint8_t val = 0;

void EXTI7_0_IRQHandler(void) __attribute__((interrupt("WCH-Interrupt-fast")));

void EXTI7_0_IRQHandler(void){

    if(EXTI_GetITStatus(EXTI_Line2)!=RESET){
        printf("External Interrup\n\r");
        //EXTI_ClearITPendingBit(EXTI_Line2);
        EXTI_ClearFlag(EXTI_Line2);
    }
}

void ExtInt_Init(void){
    GPIO_InitTypeDef GPIO_InitStructure = {0};
    EXTI_InitTypeDef EXTI_InitStructure = {0};
    NVIC_InitTypeDef NVIC_InitStructure = {0};

    RCC_APB1PeriphClockCmd(RCC_APB2Periph_GPIOC | RCC_APB2Periph_AFIO, ENABLE);

    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
    GPIO_Init(GPIOC, &GPIO_InitStructure);

    GPIO_EXTILineConfig(GPIO_PortSourceGPIOC, GPIO_PinSource2);
    EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Rising;
    EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
    EXTI_InitStructure.EXTI_LineCmd = ENABLE;
    EXTI_InitStructure.EXTI_Line = EXTI_Line2;

    EXTI_Init(&EXTI_InitStructure);


    NVIC_InitStructure.NVIC_IRQChannel = EXTI7_0_IRQn;
    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;

    NVIC_Init(&NVIC_InitStructure);

}
/*********************************************************************
 * @fn      USARTx_CFG
 *
 * @brief   Initializes the USART2 & USART3 peripheral.
 *
 * @return  none
 */
void USARTx_CFG(void)
{
    GPIO_InitTypeDef  GPIO_InitStructure = {0};
    USART_InitTypeDef USART_InitStructure = {0};

    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOD | RCC_APB2Periph_USART1, ENABLE);

    /* USART1 TX-->D.5   RX-->D.6 */
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
    GPIO_Init(GPIOD, &GPIO_InitStructure);
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
    GPIO_Init(GPIOD, &GPIO_InitStructure);

    USART_InitStructure.USART_BaudRate = 115200;
    USART_InitStructure.USART_WordLength = USART_WordLength_8b;
    USART_InitStructure.USART_StopBits = USART_StopBits_1;
    USART_InitStructure.USART_Parity = USART_Parity_No;
    USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
    USART_InitStructure.USART_Mode = USART_Mode_Tx | USART_Mode_Rx;

    USART_Init(USART1, &USART_InitStructure);
    USART_Cmd(USART1, ENABLE);
}

/*  SPI CONFIGURATION */
/*
 * PC5 -> SCK
 * PC6 -> MOSI
 * PC7 -> MISO
 * PC0 -> NSS
 *
 * */

void SPI_CFG(void){
    GPIO_InitTypeDef GPIO_InitStructure = {0};
    SPI_InitTypeDef SPI_InitStructure = {0};
    NVIC_InitTypeDef NVIC_InitStructure = {0};

    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC | RCC_APB2Periph_SPI1, ENABLE);
    /* Configurate inputs*/
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5 | GPIO_Pin_6;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
    GPIO_Init(GPIOC, &GPIO_InitStructure);

    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_7;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
    GPIO_Init(GPIOC, &GPIO_InitStructure);

    SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_128;
    SPI_InitStructure.SPI_CPHA = SPI_CPHA_1Edge;
    SPI_InitStructure.SPI_CPOL = SPI_CPOL_Low;
    SPI_InitStructure.SPI_CRCPolynomial = 7;
    SPI_InitStructure.SPI_DataSize = SPI_DataSize_16b;
    SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex;
    SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
    SPI_InitStructure.SPI_Mode = SPI_Mode_Master;
    SPI_InitStructure.SPI_NSS = SPI_NSS_Soft;

    SPI_Init(SPI1, &SPI_InitStructure);

    NVIC_InitStructure.NVIC_IRQChannel = EXTI7_0_IRQn;
    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 2;

    NVIC_Init(&NVIC_InitStructure);
    // NSS
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(GPIOC, &GPIO_InitStructure);

    GPIO_WriteBit(GPIOC, GPIO_Pin_0,Bit_SET);
    SPI_Cmd( SPI1, ENABLE );
}

/*********************************************************************
 * @fn      main
 *
 * @brief   Main program.
 *
 * @return  none
 */
int main(void)
{
    NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);
    Delay_Init();
    USART_Printf_Init(115200);
    printf("SystemClk:%d\r\n",SystemCoreClock);

    USARTx_CFG();
    ExtInt_Init();
    SPI_CFG();
    while(1)
    {

        if (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_TXE)== SET){
            printf("IF \n");
            //GPIO_WriteBit(GPIOB, GPIO_Pin_12,Bit_SET);
            //Delay_Ms(30);
            GPIO_WriteBit(GPIOC, GPIO_Pin_0,Bit_RESET);

            SPI_I2S_SendData(SPI1, 0xAA0A);
            while(SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_RXNE)== RESET);
            GPIO_WriteBit(GPIOC, GPIO_Pin_0,Bit_SET);
            printf("Data in SPI1");
            iData_SPI = SPI_I2S_ReceiveData(SPI1);
            Sx_Op_Flag = (iData_SPI & 0x4)>>2;
            if(Sx_Op_Flag){
                printf("No sensor\n\r");
            }else{
                 Temperature = 0.25 * (float)(iData_SPI>>3);
                 printf(" %2.2f C \r\n",Temperature);
            }
        }
        Delay_Ms(400);
    }
}

And everything is compiled well:
text data bss dec hex filename
5900 40 276 6216 1848 Reflow_HotPlate.elf

However, it doesn't print float variables, in order to do that, there's a option as shown below :

I used this option with CH32V203 and worked , but with this CH32V003, that has less memory, i didn't compiled, the error message is:

make -j4 all
c:/mounriver/mounriver_studio/toolchain/risc-v embedded gcc/bin/../lib/gcc/riscv-none-embed/8.2.0/../../../../riscv-none-embed/bin/ld.exe: Reflow_HotPlate.elf section "text" will not fit into region "FLASH"
c:/mounriver/mounriver_studio/toolchain/risc-v embedded gcc/bin/../lib/gcc/riscv-none-embed/8.2.0/../../../../riscv-none-embed/bin/ld.exe: region `FLASH' overflowed by 7408 bytes
collect2.exe: error: ld returned 1 exit status
make: *** [makefile:56: Reflow_HotPlate.elf] Error 1

I can find howto print float, but I really want to understand (learn) why this is happening.
I hope someone could explain me the reason.

Thanks in advanced
Arlen

 

[Kurenai_ryu]

the print_float is very heavy, the .text segment is your program memory usage (yeah, it sounds confusing, but it's related to the program size, not 'text' string or similar)
you need to implement your own print_float (maybe something with fixed point and two decimal or something like that, that doesn't require printf as its too big for your microcontroller)