X-Git-Url: https://codewiz.org/gitweb?a=blobdiff_plain;f=bertos%2Fcpu%2Farm%2Fdrv%2Fi2c_lpc2.c;h=fd6a9fda45237c4a47d05225e852485b86101ce7;hb=2b74d29e47161c81ee4f055072a63a54310249c8;hp=1f2e43397ecf04cafbb16951a2093bcbfc591758;hpb=24c336c67562f66af4039128d6b7cbc78c13a2a7;p=bertos.git diff --git a/bertos/cpu/arm/drv/i2c_lpc2.c b/bertos/cpu/arm/drv/i2c_lpc2.c index 1f2e4339..fd6a9fda 100644 --- a/bertos/cpu/arm/drv/i2c_lpc2.c +++ b/bertos/cpu/arm/drv/i2c_lpc2.c @@ -32,6 +32,7 @@ * * \brief Driver for the LPC23xx I2C (implementation) * + * \author Daniele Basile */ #include "cfg/cfg_i2c.h" @@ -43,49 +44,28 @@ #include #include // BV() -#include #include #include +#include #include #include -#include /* vic_handler_t */ #include -#include - - struct I2cHardware { - int dev; + uint32_t base; + uint32_t pconp; + uint32_t pinsel_port; + uint32_t pinsel; + uint32_t pinsel_mask; + uint32_t pclksel; + uint32_t pclk_mask; + uint32_t pclk_div; }; -/* - * - */ -#if 1 - /* I2C 0 */ - #define I2C_PCONP PCONP_PCI2C0 - #define I2C_CONSET I20CONSET - #define I2C_CONCLR I20CONCLR - #define I2C_SCLH I20SCLH - #define I2C_SCLL I20SCLL - #define I2C_STAT I20STAT - #define I2C_DAT I20DAT - #define I2C_PINSEL_PORT PINSEL1 - #define I2C_PINSEL I2C0_PINSEL - #define I2C_PINSEL_MASK I2C0_PINSEL_MASK - #define I2C_PCLKSEL PCLKSEL0 - #define I2C_PCLK_MASK I2C0_PCLK_MASK - #define I2C_PCLK_DIV8 I2C0_PCLK_DIV8 -#else - /* I2C 1 */ - #error -#endif - -#define GET_STATUS() ((uint8_t)I2C_STAT) /* * Wait that SI bit is set. * @@ -93,95 +73,89 @@ struct I2cHardware * state F8 does not set SI since there is nothing for an interrupt service * routine to do in that case. */ -#define WAIT_SI() \ - do { \ - ticks_t start = timer_clock(); \ - while( !(I2C_CONSET & BV(I2CON_SI)) ) \ - { \ - if (timer_clock() - start > ms_to_ticks(CONFIG_I2C_START_TIMEOUT)) \ +#define WAIT_SI(i2c) \ + do { \ + ticks_t start = timer_clock(); \ + while( !(HWREG(i2c->hw->base + I2C_CONSET_OFF) & BV(I2CON_SI)) ) \ { \ - LOG_ERR("Timeout SI assert\n"); \ - break; \ + if (timer_clock() - start > ms_to_ticks(CONFIG_I2C_START_TIMEOUT)) \ + { \ + LOG_ERR("Timeout SI assert\n"); \ + LOG_ERR("[%08lx]\n", HWREG(i2c->hw->base + I2C_STAT_OFF)); \ + break; \ + } \ + cpu_relax(); \ } \ - } \ } while (0) -static void i2c_hw_restart(void) +static void i2c_hw_restart(I2c *i2c) { // Clear all pending flags. - I2C_CONCLR = BV(I2CON_STAC) | BV(I2CON_SIC) | BV(I2CON_AAC); + HWREG(i2c->hw->base + I2C_CONCLR_OFF) = BV(I2CON_STAC) | BV(I2CON_SIC) | BV(I2CON_AAC); // Set start and ack bit. - I2C_CONSET = BV(I2CON_STA); + HWREG(i2c->hw->base + I2C_CONSET_OFF) = BV(I2CON_STA); - WAIT_SI(); + WAIT_SI(i2c); } -static void i2c_hw_stop(void) +static void i2c_hw_stop(I2c *i2c) { /* Set the stop bit */ - I2C_CONSET = BV(I2CON_STO); + HWREG(i2c->hw->base + I2C_CONSET_OFF) = BV(I2CON_STO); /* Clear pending flags */ - I2C_CONCLR = BV(I2CON_STAC) | BV(I2CON_SIC) | BV(I2CON_AAC); + HWREG(i2c->hw->base + I2C_CONCLR_OFF) = BV(I2CON_STAC) | BV(I2CON_SIC) | BV(I2CON_AAC); } -static void i2c_lpc2_put(I2c *i2c, uint8_t data) +static void i2c_lpc2_putc(I2c *i2c, uint8_t data) { - I2C_DAT = data; + HWREG(i2c->hw->base + I2C_DAT_OFF) = data; + HWREG(i2c->hw->base + I2C_CONCLR_OFF) = BV(I2CON_SIC); -// kprintf("w %02x\n", data); + WAIT_SI(i2c); - I2C_CONCLR = BV(I2CON_SIC); + uint32_t status = HWREG(i2c->hw->base + I2C_STAT_OFF); - WAIT_SI(); - - uint32_t status = GET_STATUS(); - //kprintf("w %08lx\n", status); - - /* if (status == I2C_STAT_DATA_ACK) */ /* Generate the stop if we finish to send all programmed bytes */ if (i2c->xfer_size == 1) { if (I2C_TEST_STOP(i2c->flags) == I2C_STOP) - i2c_hw_stop(); + i2c_hw_stop(i2c); } if (status == I2C_STAT_DATA_NACK) { LOG_ERR("Data NACK\n"); i2c->errors |= I2C_NO_ACK; - i2c_hw_stop(); + i2c_hw_stop(i2c); } else if ((status == I2C_STAT_ERROR) || (status == I2C_STAT_UNKNOW)) { LOG_ERR("I2C error.\n"); i2c->errors |= I2C_ERR; - i2c_hw_stop(); + i2c_hw_stop(i2c); } } -static uint8_t i2c_lpc2_get(I2c *i2c) +static uint8_t i2c_lpc2_getc(I2c *i2c) { /* * Set ack bit if we want read more byte, otherwise * we disable it */ if (i2c->xfer_size > 1) - I2C_CONSET = BV(I2CON_AA); + HWREG(i2c->hw->base + I2C_CONSET_OFF) = BV(I2CON_AA); else - I2C_CONCLR = BV(I2CON_AAC); + HWREG(i2c->hw->base + I2C_CONCLR_OFF) = BV(I2CON_AAC); - I2C_CONCLR = BV(I2CON_SIC); + HWREG(i2c->hw->base + I2C_CONCLR_OFF) = BV(I2CON_SIC); - WAIT_SI(); + WAIT_SI(i2c); - uint32_t status = GET_STATUS(); - uint8_t data = (uint8_t)(I2C_DAT & 0xFF); - -// kprintf("r %02x\n", data); -// kprintf("r %08lx\n", status); + uint32_t status = HWREG(i2c->hw->base + I2C_STAT_OFF); + uint8_t data = (uint8_t)HWREG(i2c->hw->base + I2C_DAT_OFF); if (status == I2C_STAT_RDATA_ACK) { @@ -194,7 +168,7 @@ static uint8_t i2c_lpc2_get(I2c *i2c) * required */ if (I2C_TEST_STOP(i2c->flags) == I2C_STOP) - i2c_hw_stop(); + i2c_hw_stop(i2c); return data; } @@ -202,14 +176,12 @@ static uint8_t i2c_lpc2_get(I2c *i2c) { LOG_ERR("I2C error.\n"); i2c->errors |= I2C_ERR; - i2c_hw_stop(); + i2c_hw_stop(i2c); } return 0xFF; } -MOD_DEFINE(i2c); - static void i2c_lpc2_start(struct I2c *i2c, uint16_t slave_addr) { if (I2C_TEST_START(i2c->flags) == I2C_START_W) @@ -217,124 +189,148 @@ static void i2c_lpc2_start(struct I2c *i2c, uint16_t slave_addr) ticks_t start = timer_clock(); while (true) { - i2c_hw_restart(); + i2c_hw_restart(i2c); - uint8_t status = GET_STATUS(); + uint8_t status = HWREG(i2c->hw->base + I2C_STAT_OFF); /* Start status ok, set addres and the R/W bit */ if ((status == I2C_STAT_SEND) || (status == I2C_STAT_RESEND)) - I2C_DAT = slave_addr & ~I2C_READBIT; + HWREG(i2c->hw->base + I2C_DAT_OFF) = slave_addr & ~I2C_READBIT; /* Clear the start bit and clear the SI bit */ - I2C_CONCLR = BV(I2CON_SIC) | BV(I2CON_STAC); + HWREG(i2c->hw->base + I2C_CONCLR_OFF) = BV(I2CON_SIC) | BV(I2CON_STAC); if (status == I2C_STAT_SLAW_ACK) break; - else if (status == I2C_STAT_ARB_LOST) + + if (status == I2C_STAT_ARB_LOST) { LOG_ERR("Arbitration lost\n"); i2c->errors |= I2C_ARB_LOST; - i2c_hw_stop(); - break; + i2c_hw_stop(i2c); } if (timer_clock() - start > ms_to_ticks(CONFIG_I2C_START_TIMEOUT)) { LOG_ERR("Timeout on I2C START\n"); i2c->errors |= I2C_NO_ACK; - i2c_hw_stop(); + i2c_hw_stop(i2c); break; } } } else if (I2C_TEST_START(i2c->flags) == I2C_START_R) { - i2c_hw_restart(); + i2c_hw_restart(i2c); - uint8_t status = GET_STATUS(); + uint8_t status = HWREG(i2c->hw->base + I2C_STAT_OFF); /* Start status ok, set addres and the R/W bit */ if ((status == I2C_STAT_SEND) || (status == I2C_STAT_RESEND)) - I2C_DAT = slave_addr | I2C_READBIT; + HWREG(i2c->hw->base + I2C_DAT_OFF) = slave_addr | I2C_READBIT; /* Clear the start bit and clear the SI bit */ - I2C_CONCLR = BV(I2CON_SIC) | BV(I2CON_STAC); + HWREG(i2c->hw->base + I2C_CONCLR_OFF) = BV(I2CON_SIC) | BV(I2CON_STAC); - WAIT_SI(); + WAIT_SI(i2c); + + status = HWREG(i2c->hw->base + I2C_STAT_OFF); - status = GET_STATUS(); -/* - if (status == I2C_STAT_SLAR_ACK) - break; -*/ if (status == I2C_STAT_SLAR_NACK) { LOG_ERR("SLAR NACK:%02x\n", status); i2c->errors |= I2C_NO_ACK; - i2c_hw_stop(); + i2c_hw_stop(i2c); } - else if (status == I2C_STAT_ARB_LOST) + + if (status == I2C_STAT_ARB_LOST) { LOG_ERR("Arbitration lost\n"); i2c->errors |= I2C_ARB_LOST; - i2c_hw_stop(); + i2c_hw_stop(i2c); } } else { ASSERT(0); } - } static const I2cVT i2c_lpc_vt = { .start = i2c_lpc2_start, - .get = i2c_lpc2_get, - .put = i2c_lpc2_put, - .send = i2c_swSend, - .recv = i2c_swRecv, + .getc = i2c_lpc2_getc, + .putc = i2c_lpc2_putc, + .write = i2c_genericWrite, + .read = i2c_genericRead, }; -struct I2cHardware i2c_lpc2_hw = +static struct I2cHardware i2c_lpc2_hw[] = { - .dev = 0, + { /* I2C0 */ + .base = I2C0_BASE_ADDR, + .pconp = BV(PCONP_PCI2C0), + .pinsel_port = PINSEL1_OFF, + .pinsel = I2C0_PINSEL, + .pinsel_mask = I2C0_PINSEL_MASK, + .pclksel = PCLKSEL0_OFF, + .pclk_mask = I2C0_PCLK_MASK, + .pclk_div = I2C0_PCLK_DIV8, + }, + { /* I2C1 */ + .base = I2C1_BASE_ADDR, + .pconp = BV(PCONP_PCI2C1), + .pinsel_port = PINSEL0_OFF, + .pinsel = I2C1_PINSEL, + .pinsel_mask = I2C1_PINSEL_MASK, + .pclksel = PCLKSEL1_OFF, + .pclk_mask = I2C1_PCLK_MASK, + .pclk_div = I2C1_PCLK_DIV8, + }, + { /* I2C2 */ + .base = I2C2_BASE_ADDR, + .pconp = BV(PCONP_PCI2C2), + .pinsel_port = PINSEL0_OFF, + .pinsel = I2C2_PINSEL, + .pinsel_mask = I2C2_PINSEL_MASK, + .pclksel = PCLKSEL1_OFF, + .pclk_mask = I2C2_PCLK_MASK, + .pclk_div = I2C2_PCLK_DIV8, + }, }; - /** * Initialize I2C module. */ void i2c_hw_init(I2c *i2c, int dev, uint32_t clock) { - i2c->hw = &i2c_lpc2_hw; + i2c->hw = &i2c_lpc2_hw[dev]; i2c->vt = &i2c_lpc_vt; /* Enable I2C clock */ - PCONP |= BV(I2C_PCONP); + PCONP |= i2c->hw->pconp; ASSERT(clock <= 400000); - I2C_CONCLR = BV(I2CON_I2ENC) | BV(I2CON_STAC) | BV(I2CON_SIC) | BV(I2CON_AAC); + HWREG(i2c->hw->base + I2C_CONCLR_OFF) = BV(I2CON_I2ENC) | BV(I2CON_STAC) | BV(I2CON_SIC) | BV(I2CON_AAC); /* * Bit Frequency = Fplk / (I2C_I2SCLH + I2C_I2SCLL) * value of I2SCLH and I2SCLL must be different */ - I2C_PCLKSEL &= ~I2C_PCLK_MASK; - I2C_PCLKSEL |= I2C_PCLK_DIV8; + HWREG(SCB_BASE_ADDR + i2c->hw->pclksel) &= ~i2c->hw->pclk_mask; + HWREG(SCB_BASE_ADDR + i2c->hw->pclksel) |= i2c->hw->pclk_div; - I2C_SCLH = (((CPU_FREQ / 8) / clock) / 2) + 1; - I2C_SCLL = (((CPU_FREQ / 8) / clock) / 2); + HWREG(i2c->hw->base + I2C_SCLH_OFF) = (((CPU_FREQ / 8) / clock) / 2) + 1; + HWREG(i2c->hw->base + I2C_SCLL_OFF) = (((CPU_FREQ / 8) / clock) / 2); - ASSERT(I2C_SCLH > 4 || I2C_SCLL > 4); + ASSERT(HWREG(i2c->hw->base + I2C_SCLH_OFF) > 4); + ASSERT(HWREG(i2c->hw->base + I2C_SCLL_OFF) > 4); - /* Assign pins to SCL and SDA (P0_27, P0_28) */ - I2C_PINSEL_PORT &= ~I2C_PINSEL_MASK; - I2C_PINSEL_PORT |= I2C_PINSEL; + /* Assign pins to SCL and SDA */ + HWREG(PINSEL_BASE_ADDR + i2c->hw->pinsel_port) &= ~i2c->hw->pinsel_mask; + HWREG(PINSEL_BASE_ADDR + i2c->hw->pinsel_port) |= i2c->hw->pinsel; // Enable I2C - I2C_CONSET = BV(I2CON_I2EN); - - MOD_INIT(i2c); + HWREG(i2c->hw->base + I2C_CONSET_OFF) = BV(I2CON_I2EN); }