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/*
* Test code for the RTC.
*
* Dumps the SRAM and EEPROM on startup, then enables the oscillator.
* After that, the clock registers are read once a second - the first byte
* is seconds (and some control bits, so dont expect 0..59).
*
*/
#include <string.h>
#include "stm_init.h"
#include "stm-uart.h"
#define DELAY() HAL_Delay(1000)
#define RTC_ADDR 0xdf
#define EEPROM_ADDR 0xaf
#define RTC_ADDR_W RTC_ADDR ^ 1 /* turn off LSB to write */
#define EEPROM_ADDR_W EEPROM_ADDR ^ 1 /* turn off LSB to write */
#define SRAM_TOTAL_BYTES 0x5f
#define EEPROM_TOTAL_BYTES 0x7f
#define EEPROM_EUI48_OFFSET 0xf0
#define EEPROM_EUI48_BYTES 8
#define TIME_OFFSET 0x0 /* Time is at offest 0 in SRAM */
#define TIME_BYTES 8
uint8_t buf[1024];
uint32_t i;
uint32_t device_ready(uint16_t i2c_addr)
{
uart_send_string("Checking readiness of 0x");
uart_send_hexbyte(i2c_addr);
uart_send_string("...");
i = HAL_I2C_IsDeviceReady (&hi2c2, i2c_addr, 10, 1000);
if (i == HAL_OK) {
uart_send_string("OK\r\n");
return 1;
}
uart_send_string("Not ready (");
uart_send_integer(i, 0);
uart_send_string(")\r\n");
return 0;
}
void send_byte(const uint16_t i2c_addr, const uint8_t value)
{
uint8_t ch = value;
uart_send_string ("Sending ");
uart_send_hexbyte (ch);
uart_send_string (" to 0x");
uart_send_hexbyte(i2c_addr);
uart_send_string("...");
while (HAL_I2C_Master_Transmit (&hi2c2, i2c_addr, &ch, 1, 1000) != HAL_OK) {
if (HAL_I2C_GetError (&hi2c2) != HAL_I2C_ERROR_AF) {
uart_send_string("Timeout\r\n");
Error_Handler();
}
}
uart_send_string("OK\r\n");
}
void read_bytes (uint8_t *buf, const uint16_t i2c_addr, const uint8_t len)
{
uart_send_string ("Reading ");
uart_send_integer (len, 0);
uart_send_string (" bytes from 0x");
uart_send_hexbyte(i2c_addr);
uart_send_string("...");
while (HAL_I2C_Master_Receive (&hi2c2, i2c_addr, buf, len, 1000) != HAL_OK) {
if (HAL_I2C_GetError (&hi2c2) != HAL_I2C_ERROR_AF) {
uart_send_string("Timeout\r\n");
Error_Handler();
}
}
uart_send_string("OK\r\n");
}
void request_data(uint8_t *buf, const uint16_t i2c_addr, const uint8_t offset, const uint8_t bytes)
{
send_byte(i2c_addr, offset);
read_bytes(buf, i2c_addr, bytes);
}
void print_time()
{
request_data(buf, RTC_ADDR, TIME_OFFSET, TIME_BYTES);
for (i = 0; i < TIME_BYTES; i++) {
uart_send_hexbyte(buf[i]);
uart_send_string(" ");
}
}
void dump_sram()
{
request_data(buf, RTC_ADDR, 0x0, SRAM_TOTAL_BYTES);
uart_send_string("SRAM contents:\r\n");
uart_send_hexdump(buf, 0, SRAM_TOTAL_BYTES);
uart_send_string("\r\n");
}
void dump_eeprom()
{
request_data(buf, EEPROM_ADDR, 0x0, EEPROM_TOTAL_BYTES);
uart_send_string("EEPROM contents:\r\n");
uart_send_hexdump(buf, 0, EEPROM_TOTAL_BYTES);
uart_send_string("\r\n");
request_data(buf, EEPROM_ADDR, EEPROM_EUI48_OFFSET, EEPROM_EUI48_BYTES);
uart_send_string("EEPROM EUI-48:\r\n");
uart_send_hexdump(buf, EEPROM_EUI48_OFFSET, EEPROM_EUI48_BYTES);
uart_send_string("\r\n");
}
void enable_oscillator()
{
uart_send_string("Enabling oscillator...\r\n");
buf[0] = 0; /* Offset of RTCSEC */
buf[1] = 1 << 7; /* datasheet REGISTERS 5-1, bit 7 = ST (start oscillator) */
while (HAL_I2C_Master_Transmit (&hi2c2, RTC_ADDR_W, buf, 2, 1000) != HAL_OK) {
if (HAL_I2C_GetError (&hi2c2) != HAL_I2C_ERROR_AF) {
uart_send_string("Timeout\r\n");
Error_Handler();
}
}
uart_send_string("OK\r\n");
}
int
main()
{
stm_init();
uart_send_string("\r\n\r\n*** Init done\r\n");
dump_sram();
dump_eeprom();
enable_oscillator();
while (1)
{
memset(buf, 0, sizeof(buf));
if (! device_ready(RTC_ADDR)) {
goto fail;
}
print_time(buf);
uart_send_string("\r\n\r\n");
HAL_GPIO_TogglePin(LED_PORT, LED_GREEN);
DELAY();
continue;
fail:
HAL_GPIO_TogglePin(LED_PORT, LED_RED);
DELAY();
}
}
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