Peter Augustin

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8 years, 3 months ago.

LPC11U35 launch AutoISP by a specific USART character

Hello,

I am trying to launch ISP by USART but it does not work. When i send the character 0 to USART then LED is stopped but ISP is not launched. I do not know why. Could you help me ?

#include "mbed.h"
#include "USBSerial.h"
 
//Virtual serial port omver USB
USBSerial serial;
Serial pc(P0_19, P0_18);
DigitalOut myled(LED1);

#define IAP_ENTRY_LOCATION        0X1FFF1FF1
typedef void (*IAP_ENTRY_T)(unsigned int[5], unsigned int[4]);
 
void IAP_Entry(unsigned int cmd_param[5], unsigned int status_result[4])
{
    ((IAP_ENTRY_T) IAP_ENTRY_LOCATION)(cmd_param, status_result);
}
 
void IAP_ReinvokeISP(){
    uint32_t command[5], result[4];
 
    //SCB->VTOR = 0;
    //LPC_SYSCON->SYSAHBCLKCTRL |= 0x14440;
    LPC_SYSCON->SYSAHBCLKCTRL |= 0x04000;
    LPC_SYSCON->SYSAHBCLKCTRL |= 0x00400;
    LPC_SYSCON->SYSAHBCLKCTRL |= 0x00040;
    LPC_SYSCON->SYSAHBCLKCTRL |= 0x10000;
    LPC_SYSCON->SYSAHBCLKDIV = 1;
    
    command[0] = 57;
    
        
    IAP_Entry(command, result);
}

void callback() {
    // Note: you need to actually read from the serial to clear the RX interrupt
     char character = serial.getc();
     if (character == '0'){
         IAP_ReinvokeISP();
         }
    
}
 
int main(void) {
    pc.baud(9600);
    serial.attach(&callback);
    //uint8_t buf[128];
    while(1)
    {
        wait (0.5);
        myled = !myled;
        wait(0.5);

    }
}
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