Posted on May 19, 2018 at 22:56Hello,
I am currently using the OctoSPI RAM on the STM32L4R9I-EVAL board (IS66WVH8M8BLL-100BLI (Hyperram)).
At first sight everything looks as expected, but when I read and than write with 8 bit access, only every second write is successful.
I changed the code of the OSPI_RAM_MemoryMapped as follows to show the problem:
while (1)
{
BSP_LED_On(LED_GREEN);
/* Writing Sequence ----------------------------------------------- */
mem_addr = (__IO uint8_t *)(OCTOSPI1_BASE);
for (index = 0; index < 1024; index++)
{
*mem_addr = (index & 0xff);
mem_addr++;
}
/* Reading Sequence ---------------------------------------------- */
mem_addr = (__IO uint8_t *)(OCTOSPI1_BASE);
for (index = 0; index < 1024; index++)
{
if (*mem_addr != (index & 0xff))
{
BSP_LED_On(LED_ORANGE);
}
mem_addr++;
}
/* Reading/Writing Sequence ---------------------------------------- */
mem_addr = (__IO uint8_t *)(OCTOSPI1_BASE);
for (index = 0; index < 1024; index++)
{
if (*mem_addr != (index & 0xff))
{
BSP_LED_Off(LED_GREEN);
while(1)
;
}
*mem_addr = 0;
if ( *mem_addr != 0 )
{
BSP_LED_On(LED_RED);
//while(1)
;
}
mem_addr++;
}
}
During debugging and inspecting the memory region 0x90000000, the problems is visible.
When changing mem_addr to an uint16_t or an uint32_t everything works as expected.
Even when adding directly after '*mem_addr = 0;' the same statement again; thus writing twice to the same location, it works.
I need some advise to understand and hopefully fix that problem.
Thanks.
#stm32l4r9 #octospi #stm32l4+ #hyperram
