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sábado, 5 de setembro de 2015

Editor/Leitor de memórias EEPROM I2C

Precisei ler algumas memórias EEPROM do tipo I2C e resolvi aproveitar uma placa de desenvolvimento MCLAB2 da Mosaico que já tem um soquete de 8 pinos para memórias 24LCXX, um PIC 16F877A e um LCD de 16x2.

As memórias EEPROM 24LC usam comunicação serial I2C (ou IIC) que utiliza 2 sinais: um clock de até 400kHz e uma via de dados bidirecional. Isso economiza bastante as portas de um microcontrolador e por isso diversos aparelhos e sistemas usam essas memórias para armazenar dados de configuração ou de monitoramento coletados por sensores.

As memórias que incluí no programa são:
24LC01 de 1kbits (8 x 128)
24LC02 de 2kbits (8 x 256)
24LC04 de 4 kbits (8 x 512)
24LC08 de 8 kbits (8 x 1024)
24LC16 de 16 kbits (8 x 2048)
24LC32 de 32 kbits (8 x 4096)
24LC64 de 64 kbits (8 x 8192)
24LC128 de 128 kbits (8 x 16384)
24LC256 de 256 kbits (8 x 32768)
24LC512 de 512 kbits (8 x 65536)

A vantagem é que todas essas memórias usam a mesma pinagem e encapsulamento DIP 8.

A parte do circuito aproveitada da placa MCLAB2 é a seguinte e pode ser montada em protoboard:

A MCLAB2 possui 4 botões de contato momentâneo, assim designei-os de botões 1 a 4, sendo que B1 tem a função de decremento, B2 de incremento, B3 de avanço e B4 de enter ou saída.

Ao ligar, aparece um Menu com as seguintes opções:
1 - Seleciona dispositivo: escolhe qual a memória a editar ou ler.
2 - Leitura da memória: apenas se consegue ver os dados gravados nos endereços
3 - Edição da memória: pode-se ver os dados e alterá-los
4 - Apagamento da memória: seta todas as posições de memória com o valor $FF (255 em decimal).

Para escolher uma das opções, aperta-se o botão correspondente à desejada.

Ao escolher a opção 1, devemos a seguir escolher qual o modelo de memória a ser usada. Os botões B1 e B2 selecionam na lista de modelos e o botão B4 aceita a seleção e volta ao menu inicial.

Na opção de leitura, devemos entrar com o endereço inicial a ser lido. Iniciando pelo digito hexadecimal mais significativo (o primeiro da esquerda, de 4) podemos mudá-lo de 0 a F com os botões B1 e B2. Aparecendo o dígito desejado, aperta-se B3 e passamos ao segundo dígito e assim por diante até o último dígito menos significativo. Se o endereço for maior do que a capacidade da memória escolhida, aparece uma mensagem de erro e volta-se para a seleção do endereço. A qualquer momento também aparece o valor do endereço em decimal. Ao final já se apresenta o valor do dado (em hexadecimal e decimal) naquela posição de memória:

Para passar para o endereço seguinte, aperta-se B2, para voltar uma posição, aperta-se B1.  Para sair da leitura, aperta-se B4.

Na opção de edição/gravação (3), também devemos entrar com o endereço inicial a ser editado. Depois de entrado o endereço, aparece o valor atual do dado naquela posição de memória. Para alterar o valor usamos B1 para modificar o valor do dígito (nibble) hexadecimal mais significativo e B2 para o nibble menos significativo. Para gravar e avançar para o próximo endereço usamos o botão B3. Para terminar a edição e voltar para o menu, aperta-se B4.


A última opção apaga a memória por inteiro, gravando o valor $FF em todas as posições. Memórias com grande capacidade demoram um certo tempo para terem todas posições apagadas. Ao final do processo aparece uma mensagem informando o final do apagamento e pedindo para apertar B4 para voltar ao menu.

O firmware para o 16F877A é o seguinte:

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