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/*
* Test read/write performance of the fmc bus
*/
#include "stm32f4xx_hal.h"
#include "stm-init.h"
#include "stm-led.h"
#include "stm-fmc.h"
#include "stm-uart.h"
#define TEST_NUM_ROUNDS 2000000
RNG_HandleTypeDef rng_inst;
static void MX_RNG_Init(void)
{
rng_inst.Instance = RNG;
HAL_RNG_Init(&rng_inst);
}
static uint32_t random(void)
{
uint32_t rnd;
if (HAL_RNG_GenerateRandomNumber(&rng_inst, &rnd) != HAL_OK) {
uart_send_string("HAL_RNG_GenerateRandomNumber failed\r\n");
Error_Handler();
}
return rnd;
}
static void sanity(void)
{
uint32_t rnd, data;
rnd = random();
if (fmc_write_32(0, &rnd) != 0) {
uart_send_string("fmc_write_32 failed\r\n");
Error_Handler();
}
if (fmc_read_32(0, &data) != 0) {
uart_send_string("fmc_read_32 failed\r\n");
Error_Handler();
}
if (data != rnd) {
uart_send_string("Data bus fail: expected ");
uart_send_hex(rnd, 8);
uart_send_string(", got ");
uart_send_hex(data, 8);
uart_send_string(", diff ");
uart_send_hex(data ^ rnd, 8);
uart_send_string("\r\n");
Error_Handler();
}
}
static void _time_check(char *label, const uint32_t t0)
{
uint32_t t = HAL_GetTick() - t0;
uart_send_string(label);
uart_send_integer(t / 1000, 0);
uart_send_char('.');
uart_send_integer(t % 1000, 3);
uart_send_string(" seconds, ");
uart_send_integer(((1000 * TEST_NUM_ROUNDS) / t), 0);
uart_send_string("/sec\r\n");
}
#define time_check(_label_, _expr_) \
do { \
uint32_t _t = HAL_GetTick(); \
(_expr_); \
_time_check(_label_, _t); \
} while (0)
static void test_read(void)
{
uint32_t i, data;
for (i = 0; i < TEST_NUM_ROUNDS; ++i) {
if (fmc_read_32(0, &data) != 0) {
uart_send_string("fmc_read_32 failed\r\n");
Error_Handler();
}
}
}
static void test_write(void)
{
uint32_t i;
for (i = 0; i < TEST_NUM_ROUNDS; ++i) {
if (fmc_write_32(0, &i) != 0) {
uart_send_string("fmc_write_32 failed\r\n");
Error_Handler();
}
}
}
int main(void)
{
stm_init();
uart_send_string("Keep calm for Novena boot...\r\n");
// Blink blue LED for six seconds to not upset the Novena at boot.
led_on(LED_BLUE);
for (int i = 0; i < 12; i++) {
HAL_Delay(500);
led_toggle(LED_BLUE);
}
led_off(LED_BLUE);
// initialize rng
MX_RNG_Init();
// prepare fmc interface
fmc_init();
sanity();
time_check("read ", test_read());
time_check("write ", test_write());
uart_send_string("Done.\r\n\r\n");
return 0;
}
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