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atmega_common: provide CPU ID for every device

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ATmega128RFA1/ATmega256RFR2 do not have a unique CPU ID.

Use the RC oscillator callibration byte as an impromptu CPU ID and rely
on bootlader constants present on all ATmega families for the remaining
bytes.

This way we can provide a faux CPU ID on all ATmega MCUs and typical hobbyists
with no access to JTAG adapters or high voltage programmer capable of writing
the user signature have a good chance that the CPU IDs of their device do not collide.
This commit is contained in:
Benjamin Valentin 2019-10-30 23:10:30 +01:00 committed by Benjamin Valentin
parent 7ee8c059c9
commit 5b6d56efd5
7 changed files with 13 additions and 61 deletions
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3
cpu/atmega128rfa1/Makefile.features
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@ -4,6 +4,3 @@ include $(RIOTCPU)/atmega_common/Makefile.features
# additional PCINT for atmega128rfa1
FEATURES_PROVIDED += atmega_pcint1
# Various other features (if any)
FEATURES_PROVIDED += periph_cpuid

7
cpu/atmega128rfa1/include/periph_cpu.h
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@ -27,13 +27,6 @@
extern "C" {
#endif
/**
* @name Length of the CPU_ID in octets
* @{
*/
#define CPUID_LEN (8U)
/** @} */
/**
* @name Available ports on the ATmega128rfa1 MCU
* @{

3
cpu/atmega256rfr2/Makefile.features
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@ -4,6 +4,3 @@ include $(RIOTCPU)/atmega_common/Makefile.features
# additional PCINT for atmega256rfr2
FEATURES_PROVIDED += atmega_pcint1
# Various other features (if any)
FEATURES_PROVIDED += periph_cpuid

7
cpu/atmega256rfr2/include/periph_cpu.h
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@ -27,13 +27,6 @@
extern "C" {
#endif
/**
* @name Length of the CPU_ID in octets
* @{
*/
#define CPUID_LEN (8U)
/** @} */
/**
* @name Available ports on the ATmega256rfr family
* @{

1
cpu/atmega_common/Makefile.features
View File

@ -4,4 +4,5 @@ FEATURES_PROVIDED += atmega_pcint0
FEATURES_PROVIDED += periph_eeprom
FEATURES_PROVIDED += periph_gpio periph_gpio_irq
FEATURES_PROVIDED += periph_pm
FEATURES_PROVIDED += periph_cpuid
FEATURES_PROVIDED += periph_wdt

7
cpu/atmega_common/include/periph_cpu_common.h
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@ -29,6 +29,13 @@
extern "C" {
#endif
/**
* @name Length of the CPU_ID in octets
* @{
*/
#define CPUID_LEN (4U)
/** @} */
#ifndef DOXYGEN
/**
* @brief Overwrite the default gpio_t type definition

46
cpu/atmega_common/periph/cpuid.c
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@ -18,50 +18,14 @@
*
* @}
*/
#include <stdio.h>
#include <stdint.h>
#include <string.h>
#include "periph/cpuid.h"
#include "atmega_regs_common.h"
#include "avr/boot.h"
#define ENABLE_DEBUG (0)
#include "debug.h"
/**
* @brief CPU_ID build from MCU register
*
* CPIUD is taken from MCU Control Register and Signature bytes.
* CPUID: 1e a8 02 1f 94 03 ff ff
* CPUID: 1e a8 02 1f 94 92 XX XX
* MEGA62/128/256_RFR2 [MANUAL] p.505
* MEGA62/128/256_RFR2 [MANUAL] p.138
* MEGA62/128/256_RFR2 [MANUAL] p.492
*
* usr_sign_0/1 are configurable values on flash page 1.
*/
void cpuid_get(void *id)
{
uint8_t signature_0 = boot_signature_byte_get(0x00);
uint8_t signature_1 = boot_signature_byte_get(0x02);
uint8_t signature_2 = boot_signature_byte_get(0x04);
uint8_t usr_sign_0 = boot_signature_byte_get(0x0100);
uint8_t usr_sign_1 = boot_signature_byte_get(0x0102);
uint8_t addr[CPUID_LEN] = {
signature_0, /* 0x1E Atmel manufacturer ID */
signature_1, /* 0xA8 Part Number high byte */
signature_2, /* 0x02 Part Number low byte */
MAN_ID_0, /* 0x1F Atmel JEDEC manufacturer ID */
PART_NUM, /* 0x94 PART_NUM Identification */
VERSION_NUM, /* 0x02 VERSION_NUM Identification */
/* last two bytes can be set to flash page 1. for differentiation of different boards */
usr_sign_0, /* user signature 0 */
usr_sign_1, /* user signature 1 */
};
memcpy(id, addr, CPUID_LEN);
uint8_t *out = id;
out[0] = boot_signature_byte_get(0x00); /* Atmel manufacturer ID (0x1E) */
out[1] = boot_signature_byte_get(0x02); /* Part Number high byte */
out[2] = boot_signature_byte_get(0x04); /* Part Number low byte */
out[3] = boot_signature_byte_get(0x01); /* internal RC calibration byte */
}