Problem reading Flash memory (W7500p)

Question

Hi all, I am facing a problem regarding the flash memory. With the following code, I can write the data and read it. However, if I disable DO_IAP(IAP_ERAS_DAT0,0,0,0) and DO_IAP(IAP_PROG,DAT0_START_ADDR,save_buff,SECT_SIZE) and try to read the data that I wrote previously, I will get strange results (no consistent values). This code is based on the IAP_EXAMPLE, in the library. What am I doing wrong? #include "W7500x.h" #include "mbed.h" #define IAP_ENTRY 0x1FFF1001 #define IAP_ERAS 0x010 #define IAP_ERAS_DAT0 (IAP_ERAS + 0) #define IAP_ERAS_SECT (IAP_ERAS + 2) #define IAP_ERAS_BLCK (IAP_ERAS + 3) #define IAP_ERAS_CHIP (IAP_ERAS + 4) #define IAP_ERAS_MASS (IAP_ERAS + 5) #define IAP_PROG 0x022 #define DAT0_START_ADDR 0x0003FE00 #define BLOCK_SIZE 4096 #define SECT_SIZE 256 struct data{ char something1[5]; int something2; } test; void DO_IAP( uint32_t id, uint32_t dst_addr, uint8_t* src_addr, uint32_t size); int main() { strcpy(&test.something1[0] ,"abcd"); test.something2 = 1000; uint8_t save_buff[BLOCK_SIZE]; memcpy(save_buff, (const char*)&test, sizeof(data) ); DO_IAP(IAP_ERAS_DAT0,0,0,0); DO_IAP(IAP_PROG,DAT0_START_ADDR,save_buff,SECT_SIZE); uint8_t data_save[BLOCK_SIZE]; memcpy(data_save,(uint8_t *)(DAT0_START_ADDR),sizeof(data)); data *p = (data*)data_save; printf("Something1: %s, Something2: %d 
",p->something1, p->something2); } void DO_IAP( uint32_t id, uint32_t dst_addr, uint8_t* src_addr, uint32_t size) { uint32_t temp_interrupt; // Backup Interrupt Set Pending Register temp_interrupt = (NVIC->ISPR[0]); (NVIC->ISPR[0]) = (uint32_t)0xFFFFFFFF; // Call IAP Function ((void(*)(uint32_t,uint32_t,uint8_t*,uint32_t))IAP_ENTRY)( id,dst_addr,src_addr,size); // Restore Interrupt Set Pending Register (NVIC->ISPR[0]) = temp_interrupt; } Thanks!

Kei · Answer

Hi, danielski. To give you a detailed answer, I need some more information, such as the board name and version you are using. Anyway, I tested your code. Looking at mbed.h, I thought that it was written in the mbed environment, and I proceeded with the mbed compiler. Is that right? Here, I have an answer. In your code, there is no initialization for Serial, how did you check the contents of printf? Anyway, I attach the code I modified. I did not include W7500.h and added Serial initialization. #include "mbed.h" #define IAP_ENTRY 0x1FFF1001 #define IAP_ERAS 0x010 #define IAP_ERAS_DAT0 (IAP_ERAS + 0) #define IAP_ERAS_SECT (IAP_ERAS + 2) #define IAP_ERAS_BLCK (IAP_ERAS + 3) #define IAP_ERAS_CHIP (IAP_ERAS + 4) #define IAP_ERAS_MASS (IAP_ERAS + 5) #define IAP_PROG 0x022 #define DAT0_START_ADDR 0x0003FE00 #define BLOCK_SIZE 4096 #define SECT_SIZE 256 struct data{ char something1[5]; int something2; } test; void DO_IAP( uint32_t id, uint32_t dst_addr, uint8_t* src_addr, uint32_t size); int main() { Serial pc(USBTX,USBRX); pc.baud(115200); pc.printf("Hello, This is test for IAP
"); strcpy(&test.something1[0] ,"abcd"); test.something2 = 1000; uint8_t save_buff[BLOCK_SIZE]; memcpy(save_buff, (const char*)&test, sizeof(data) ); DO_IAP(IAP_ERAS_DAT0,0,0,0); DO_IAP(IAP_PROG,DAT0_START_ADDR,save_buff,SECT_SIZE); uint8_t data_save[BLOCK_SIZE]; memcpy(data_save,(uint8_t *)(DAT0_START_ADDR),sizeof(data)); data *p = (data*)data_save; pc.printf("Something1: %s, Something2: %d 
",p->something1, p->something2); } void DO_IAP( uint32_t id, uint32_t dst_addr, uint8_t* src_addr, uint32_t size) { uint32_t temp_interrupt; // Backup Interrupt Set Pending Register temp_interrupt = (NVIC->ISPR[0]); (NVIC->ISPR[0]) = (uint32_t)0xFFFFFFFF; // Call IAP Function ((void(*)(uint32_t,uint32_t,uint8_t*,uint32_t))IAP_ENTRY)( id,dst_addr,src_addr,size); // Restore Interrupt Set Pending Register (NVIC->ISPR[0]) = temp_interrupt; } In my case, it worked just as you intended. (disable…