From: Robin Krens Date: Sun, 11 Aug 2019 13:34:16 +0000 (+0800) Subject: eeprom sequential read X-Git-Url: https://robinkrens.nl/gitweb/?a=commitdiff_plain;h=689a542fb80cb5c3b1e6776c1f799572a103696a;p=cortex-from-scratch eeprom sequential read --- diff --git a/drivers/at24c.c b/drivers/at24c.c index 25a65fb..f110598 100644 --- a/drivers/at24c.c +++ b/drivers/at24c.c @@ -26,51 +26,49 @@ #define READ_CMD 0xA1 #define WRITE_CMD 0xA0 - +#define PAGE 64 /* Bytes that can be written continiously */ +#define BUFFER 256 /* */ /* STM32F1 microcontrollers do not provide the ability to pull-up SDA and SCL lines. Their GPIOs must be configured as open-drain. So, you have to add two additional resistors to -pull-up I2C lines. Something between 4K and 10K is a proven value. +pull-up I2C lines. Something between 4K and 10K is a proven value. */ -void at24c_init() { +char buf[BUFFER]; + +void * cap_handler() { + + printf("a!"); +} - /* Program the peripheral input clock in I2C_CR2 Register in order to generate correct timings - Configure the clock control registers CCR - Configure the rise time register TRIS - Program the I2C_CR1 register to enable the peripheral +void at24c_init() { - ENABLE GPIOB6 and B7*/ + /* Program the peripheral input clock in I2C_CR2 Register + * in order to generate correct timings. Configure the clock control registers CCR + Configure the rise time register TRIS Program the I2C_CR1 register to enable the peripheral Enable GPIOB6 and B7*/ rsetbit(RCC_APB1ENR, 21); rsetbit(RCC_APB2ENR, 3); - // //regw_u8(AFIO_EVCR, 0x89, 0, SETBIT);// set event control register, output on ? - rwrite(GPIOB_CRL, 0xEE444444); - - rsetbitsfrom(I2C_CR2, 0, 0x2); // 36 MHz + rsetbitsfrom(I2C_CR2, 0, 0x2); // 2 MHz rwrite(I2C_TRISE, 0x3); // MAX = 1000ns, TPCLK1 = 500ns (+1) rwrite(I2C_CCR, 0x000A); // standard mode， output 100 kHz (100hz* / perip) - - rsetbit(I2C_CR1, 10); // send ack if receive - + rsetbit(I2C_CR1, 10); // send ack if Master receives data + rsetbit(I2C_CR2, 10); // buffer interrupt rsetbit(I2C_CR1, 0); // enable + } static void start_condition() { - rsetbit(I2C_CR1, 8); //start - } static void stop_condition() { - rsetbit(I2C_CR1, 9); //stop } static int ack_recv() { - int cnt = 0; while(!(*I2C_SR1 & 0x2)) { cnt++; @@ -80,7 +78,6 @@ static int ack_recv() { int a = *I2C_SR2; return 1; - } static int buf_empty() { @@ -90,20 +87,16 @@ static int buf_empty() { if (cnt > TIMEOUT) return 0; } - return 1; } +// TODO: interrupt base, so it doesn't block static void data_recv() { - //int cnt = 0; - while(!(*I2C_SR1 & 0x4)) { - /// cnt++; - // if (cnt > TIMEOUT) - // return 0; + while(!(*I2C_SR1 & 0x40)) { } - //return 1; } +// TODO: polling static int delay() { int a = 0; @@ -111,37 +104,133 @@ static int delay() { a++; } -void at24c_run() { +int eeprom_write(uint16_t addr, char * data, size_t size) { + + if(size > PAGE) { + printf("Maximum writable page size: %d\n", PAGE); + return -1; + } -// regw_u32(I2C_CR1, 0x1, 8, SETBIT); -// uint32_t read_status = *I2C_SR1; + uint8_t hi_lo[] = { (uint8_t)(addr >> 8), (uint8_t)addr }; + + start_condition(); + rwrite(I2C_DR, WRITE_CMD); + if(!ack_recv()) { + printf("Can't reach device"); + return -1; + } -// regw_u32(I2C_DR, DATASET, 0, OWRITE); - // conform DATA -// read_status = *I2C_SR1; -// read_status = *I2C_SR2; + rwrite(I2C_DR, hi_lo[0]); // higher part of address + if(!buf_empty()) { + printf("Can't address location"); + return -1; + } + rwrite(I2C_DR,hi_lo[1]); // lower part of address + if(!buf_empty()) { + printf("Can't address location"); + return -1; + } - uint32_t statusr; + for (int i = 0; i < size; i++) { + rwrite(I2C_DR, *data++); + if(!buf_empty()) { + printf("Write error"); + return -1; + } + } + stop_condition(); + + return 0; +} +/* Random access read based on dummy write */ +int eeprom_read(uint16_t addr, int num) { + + printf("ENTERING"); + uint8_t hi_lo[] = { (uint8_t)(addr >> 8), (uint8_t)addr }; + start_condition(); - //uint32_t statusr = *I2C_SR1; // clear start_signal - rwrite(I2C_DR, 0xA0); // write to address CMD - if(!ack_recv()) - cputs("CAN'T REACH DEVICE"); - - rwrite(I2C_DR, 0x00); - if(!buf_empty()) - cputs("FAIL"); - rwrite(I2C_DR, 0x00); - if(!buf_empty()) - cputs("FAIL"); - //rwrite(I2C_DR, 0x61); - //if(!buf_empty()) - // cputs("FAIL"); + + rwrite(I2C_DR, WRITE_CMD); + if(!ack_recv()) { + printf("Can't reach device"); + return -1; + } + + rwrite(I2C_DR, hi_lo[0]); // higher part of address + if(!buf_empty()) { + printf("Can't address location"); + return -1; + } + rwrite(I2C_DR,hi_lo[1]); // lower part of address + if(!buf_empty()) { + printf("Can't address location"); + return -1; + } - //statusr = *I2C_SR1; - //statusr = *I2C_SR2; stop_condition(); + + delay(); // NEEDED? + + start_condition(); // restart condition + rwrite(I2C_DR, READ_CMD); // read? to address CMD + if(!ack_recv()) { + printf("Can't initiate read"); + return -1; + } + + + rsetbit(I2C_CR1, 10); // send ack if Master receives data +// data_recv(); +// char c = *I2C_DR; +// printf("%d:%p\n", addr, c); + for (int i = 0; i < BUFFER ; i++ ) { + data_recv(); + buf[i] = (char) *I2C_DR; + } + + printf("%p, %p, %p, %p\n", *I2C_SR1, *I2C_SR2, *I2C_DR, *I2C_CR1); + printf("DATA: %s\n", buf); + +} + +void at24c_run() { + +// char * global_data = "abcdefghijklmnop"; + +// eeprom_write(0x0080, global_data, strlen(global_data)); + +// delay(); + +// for (int i = 0; i < 0xFFFF; i++) { +// eeprom_read(i); +// delay(); +// } + + //delay(); + + eeprom_read(0x0000); + +//W uint32_t statusr; +//W +//W start_condition(); +//W rwrite(I2C_DR, WRITE_CMD); // write to address CMD +//W if(!ack_recv()) +//W cputs("CAN'T REACH DEVICE"); +//W +//W rwrite(I2C_DR, 0x00); +//W if(!buf_empty()) +//W cputs("FAIL"); +//W rwrite(I2C_DR, 0x03); +//W if(!buf_empty()) +//W cputs("FAIL"); +//W //rwrite(I2C_DR, 0x61); +//W //if(!buf_empty()) +//W // cputs("FAIL"); +//W +//W //statusr = *I2C_SR1; +//W //statusr = *I2C_SR2; +//W stop_condition(); // start_condition(); // rwrite(I2C_DR, 0xA0); // dummy write @@ -155,21 +244,21 @@ void at24c_run() { // if(!buf_empty()) // cputs("FAIL"); // - delay(); - - start_condition(); // restart condition - rwrite(I2C_DR, 0xA1); // read? to address CMD - if(!ack_recv()) - cputs("COULDN'T START READ CMD"); - - - data_recv(); - //cputs("NO RESPONSE"); - - char a = (char) *I2C_DR; - printf("DATA %c\n", a); - - stop_condition(); +//W delay(); +//W +//W start_condition(); // restart condition +//W rwrite(I2C_DR, 0xA1); // read? to address CMD +//W if(!ack_recv()) +//W cputs("COULDN'T START READ CMD"); +//W +//W +//W data_recv(); +//W //cputs("NO RESPONSE"); +//W +//W char a = (char) *I2C_DR; +//W printf("DATA %c\n", a); +//W +//W stop_condition(); //delay(); //start_condition(); diff --git a/main.c b/main.c index b4f26ab..0390040 100644 --- a/main.c +++ b/main.c @@ -39,7 +39,7 @@ void main() ivt_init(); uart_init(); // cputs("ROBSYS LOADING...\n"); - systick_init(); + //systick_init(); // tsensor_output(0xFFFF, 0x7FFF); init_printf(NULL, putc);